Merge pull request #1636 from vector-im/feature/attachement_pager

Feature/attachement pager

CHANGES.md

@@ -8,6 +8,7 @@ Improvements 🙌:
  - Cleaning chunks with lots of events as long as a threshold has been exceeded (35_000 events in DB) (#1634)
  - Creating and listening to EventInsertEntity. (#1634)
  - Handling (almost) properly the groups fetching (#1634)
+ - Improve fullscreen media display (#327)
 
 Bugfix 🐛:
  - Regression |  Share action menu do not work (#1647)

attachment-viewer/.gitignore

@@ -0,0 +1 @@
+/build

attachment-viewer/build.gradle

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
+buildscript {
+    repositories {
+        maven {
+            url 'https://jitpack.io'
+            content {
+                // PhotoView
+                includeGroupByRegex 'com\\.github\\.chrisbanes'
+            }
+        }
+        jcenter()
+    }
+
+}
+
+android {
+    compileSdkVersion 29
+
+    defaultConfig {
+        minSdkVersion 21
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+    implementation 'com.github.chrisbanes:PhotoView:2.0.0'
+
+    implementation 'io.reactivex.rxjava2:rxkotlin:2.3.0'
+    implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
+
+    implementation fileTree(dir: "libs", include: ["*.jar"])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation 'androidx.core:core-ktx:1.3.0'
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'com.google.android.material:material:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'androidx.navigation:navigation-fragment-ktx:2.1.0'
+    implementation 'androidx.navigation:navigation-ui-ktx:2.1.0'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+
+}

attachment-viewer/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

attachment-viewer/src/main/AndroidManifest.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest package="im.vector.riotx.attachmentviewer" />

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/AnimatedImageViewHolder.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.view.View
+import android.widget.ImageView
+import android.widget.ProgressBar
+
+class AnimatedImageViewHolder constructor(itemView: View) :
+        BaseViewHolder(itemView) {
+
+    val touchImageView: ImageView = itemView.findViewById(R.id.imageView)
+    val imageLoaderProgress: ProgressBar = itemView.findViewById(R.id.imageLoaderProgress)
+
+    internal val target = DefaultImageLoaderTarget(this, this.touchImageView)
+}

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/AttachmentEvents.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+sealed class AttachmentEvents {
+    data class VideoEvent(val isPlaying: Boolean, val progress: Int, val duration: Int) : AttachmentEvents()
+}
+
+interface AttachmentEventListener {
+    fun onEvent(event: AttachmentEvents)
+}
+
+sealed class AttachmentCommands {
+    object PauseVideo : AttachmentCommands()
+    object StartVideo : AttachmentCommands()
+    data class SeekTo(val percentProgress: Int) : AttachmentCommands()
+}

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/AttachmentSourceProvider.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.content.Context
+import android.view.View
+
+sealed class AttachmentInfo(open val uid: String) {
+    data class Image(override val uid: String, val url: String, val data: Any?) : AttachmentInfo(uid)
+    data class AnimatedImage(override val uid: String, val url: String, val data: Any?) : AttachmentInfo(uid)
+    data class Video(override val uid: String, val url: String, val data: Any, val thumbnail: Image?) : AttachmentInfo(uid)
+//    data class Audio(override val uid: String, val url: String, val data: Any) : AttachmentInfo(uid)
+//    data class File(override val uid: String, val url: String, val data: Any) : AttachmentInfo(uid)
+}
+
+interface AttachmentSourceProvider {
+
+    fun getItemCount(): Int
+
+    fun getAttachmentInfoAt(position: Int): AttachmentInfo
+
+    fun loadImage(target: ImageLoaderTarget, info: AttachmentInfo.Image)
+
+    fun loadImage(target: ImageLoaderTarget, info: AttachmentInfo.AnimatedImage)
+
+    fun loadVideo(target: VideoLoaderTarget, info: AttachmentInfo.Video)
+
+    fun overlayViewAtPosition(context: Context, position: Int): View?
+
+    fun clear(id: String)
+}

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/AttachmentViewerActivity.kt

@@ -0,0 +1,335 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ * Copyright (C) 2018 stfalcon.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.graphics.Color
+import android.os.Bundle
+import android.view.GestureDetector
+import android.view.MotionEvent
+import android.view.ScaleGestureDetector
+import android.view.View
+import android.view.ViewGroup
+import android.view.WindowManager
+import android.widget.ImageView
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.GestureDetectorCompat
+import androidx.core.view.ViewCompat
+import androidx.core.view.isVisible
+import androidx.core.view.updatePadding
+import androidx.transition.TransitionManager
+import androidx.viewpager2.widget.ViewPager2
+import kotlinx.android.synthetic.main.activity_attachment_viewer.*
+import java.lang.ref.WeakReference
+import kotlin.math.abs
+
+abstract class AttachmentViewerActivity : AppCompatActivity(), AttachmentEventListener {
+
+    lateinit var pager2: ViewPager2
+    lateinit var imageTransitionView: ImageView
+    lateinit var transitionImageContainer: ViewGroup
+
+    var topInset = 0
+    var bottomInset = 0
+    var systemUiVisibility = true
+
+    private var overlayView: View? = null
+        set(value) {
+            if (value == overlayView) return
+            overlayView?.let { rootContainer.removeView(it) }
+            rootContainer.addView(value)
+            value?.updatePadding(top = topInset, bottom = bottomInset)
+            field = value
+        }
+
+    private lateinit var swipeDismissHandler: SwipeToDismissHandler
+    private lateinit var directionDetector: SwipeDirectionDetector
+    private lateinit var scaleDetector: ScaleGestureDetector
+    private lateinit var gestureDetector: GestureDetectorCompat
+
+    var currentPosition = 0
+
+    private var swipeDirection: SwipeDirection? = null
+
+    private fun isScaled() = attachmentsAdapter.isScaled(currentPosition)
+
+    private var wasScaled: Boolean = false
+    private var isSwipeToDismissAllowed: Boolean = true
+    private lateinit var attachmentsAdapter: AttachmentsAdapter
+    private var isOverlayWasClicked = false
+
+//    private val shouldDismissToBottom: Boolean
+//        get() = e == null
+//                || !externalTransitionImageView.isRectVisible
+//                || !isAtStartPosition
+
+    private var isImagePagerIdle = true
+
+    fun setSourceProvider(sourceProvider: AttachmentSourceProvider) {
+        attachmentsAdapter.attachmentSourceProvider = sourceProvider
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        // This is important for the dispatchTouchEvent, if not we must correct
+        // the touch coordinates
+        window.decorView.systemUiVisibility = (
+                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                        or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                        or View.SYSTEM_UI_FLAG_IMMERSIVE)
+        window.setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
+        window.setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION, WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION)
+
+        setContentView(R.layout.activity_attachment_viewer)
+        attachmentPager.orientation = ViewPager2.ORIENTATION_HORIZONTAL
+        attachmentsAdapter = AttachmentsAdapter()
+        attachmentPager.adapter = attachmentsAdapter
+        imageTransitionView = transitionImageView
+        transitionImageContainer = findViewById(R.id.transitionImageContainer)
+        pager2 = attachmentPager
+        directionDetector = createSwipeDirectionDetector()
+        gestureDetector = createGestureDetector()
+
+        attachmentPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
+            override fun onPageScrollStateChanged(state: Int) {
+                isImagePagerIdle = state == ViewPager2.SCROLL_STATE_IDLE
+            }
+
+            override fun onPageSelected(position: Int) {
+                onSelectedPositionChanged(position)
+            }
+        })
+
+        swipeDismissHandler = createSwipeToDismissHandler()
+        rootContainer.setOnTouchListener(swipeDismissHandler)
+        rootContainer.viewTreeObserver.addOnGlobalLayoutListener { swipeDismissHandler.translationLimit = dismissContainer.height / 4 }
+
+        scaleDetector = createScaleGestureDetector()
+
+        ViewCompat.setOnApplyWindowInsetsListener(rootContainer) { _, insets ->
+            overlayView?.updatePadding(top = insets.systemWindowInsetTop, bottom = insets.systemWindowInsetBottom)
+            topInset = insets.systemWindowInsetTop
+            bottomInset = insets.systemWindowInsetBottom
+            insets
+        }
+    }
+
+    fun onSelectedPositionChanged(position: Int) {
+        attachmentsAdapter.recyclerView?.findViewHolderForAdapterPosition(currentPosition)?.let {
+            (it as? BaseViewHolder)?.onSelected(false)
+        }
+        attachmentsAdapter.recyclerView?.findViewHolderForAdapterPosition(position)?.let {
+            (it as? BaseViewHolder)?.onSelected(true)
+            if (it is VideoViewHolder) {
+                it.eventListener = WeakReference(this)
+            }
+        }
+        currentPosition = position
+        overlayView = attachmentsAdapter.attachmentSourceProvider?.overlayViewAtPosition(this@AttachmentViewerActivity, position)
+    }
+
+    override fun onPause() {
+        attachmentsAdapter.onPause(currentPosition)
+        super.onPause()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        attachmentsAdapter.onResume(currentPosition)
+    }
+
+    override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
+        // The zoomable view is configured to disallow interception when image is zoomed
+
+        // Check if the overlay is visible, and wants to handle the click
+        if (overlayView?.isVisible == true && overlayView?.dispatchTouchEvent(ev) == true) {
+            return true
+        }
+
+        // Log.v("ATTACHEMENTS", "================\ndispatchTouchEvent $ev")
+        handleUpDownEvent(ev)
+
+        // Log.v("ATTACHEMENTS", "scaleDetector is in progress ${scaleDetector.isInProgress}")
+        // Log.v("ATTACHEMENTS", "pointerCount ${ev.pointerCount}")
+        // Log.v("ATTACHEMENTS", "wasScaled $wasScaled")
+        if (swipeDirection == null && (scaleDetector.isInProgress || ev.pointerCount > 1 || wasScaled)) {
+            wasScaled = true
+//            Log.v("ATTACHEMENTS", "dispatch to pager")
+            return attachmentPager.dispatchTouchEvent(ev)
+        }
+
+        // Log.v("ATTACHEMENTS", "is current item scaled ${isScaled()}")
+        return (if (isScaled()) super.dispatchTouchEvent(ev) else handleTouchIfNotScaled(ev)).also {
+//            Log.v("ATTACHEMENTS", "\n================")
+        }
+    }
+
+    private fun handleUpDownEvent(event: MotionEvent) {
+        // Log.v("ATTACHEMENTS", "handleUpDownEvent $event")
+        if (event.action == MotionEvent.ACTION_UP) {
+            handleEventActionUp(event)
+        }
+
+        if (event.action == MotionEvent.ACTION_DOWN) {
+            handleEventActionDown(event)
+        }
+
+        scaleDetector.onTouchEvent(event)
+        gestureDetector.onTouchEvent(event)
+    }
+
+    private fun handleEventActionDown(event: MotionEvent) {
+        swipeDirection = null
+        wasScaled = false
+        attachmentPager.dispatchTouchEvent(event)
+
+        swipeDismissHandler.onTouch(rootContainer, event)
+        isOverlayWasClicked = dispatchOverlayTouch(event)
+    }
+
+    private fun handleEventActionUp(event: MotionEvent) {
+//        wasDoubleTapped = false
+        swipeDismissHandler.onTouch(rootContainer, event)
+        attachmentPager.dispatchTouchEvent(event)
+        isOverlayWasClicked = dispatchOverlayTouch(event)
+    }
+
+    private fun handleSingleTap(event: MotionEvent, isOverlayWasClicked: Boolean) {
+        // TODO if there is no overlay, we should at least toggle system bars?
+        if (overlayView != null && !isOverlayWasClicked) {
+            toggleOverlayViewVisibility()
+            super.dispatchTouchEvent(event)
+        }
+    }
+
+    private fun toggleOverlayViewVisibility() {
+        if (systemUiVisibility) {
+            // we hide
+            TransitionManager.beginDelayedTransition(rootContainer)
+            hideSystemUI()
+            overlayView?.isVisible = false
+        } else {
+            // we show
+            TransitionManager.beginDelayedTransition(rootContainer)
+            showSystemUI()
+            overlayView?.isVisible = true
+        }
+    }
+
+    private fun handleTouchIfNotScaled(event: MotionEvent): Boolean {
+//        Log.v("ATTACHEMENTS", "handleTouchIfNotScaled $event")
+        directionDetector.handleTouchEvent(event)
+
+        return when (swipeDirection) {
+            SwipeDirection.Up, SwipeDirection.Down    -> {
+                if (isSwipeToDismissAllowed && !wasScaled && isImagePagerIdle) {
+                    swipeDismissHandler.onTouch(rootContainer, event)
+                } else true
+            }
+            SwipeDirection.Left, SwipeDirection.Right -> {
+                attachmentPager.dispatchTouchEvent(event)
+            }
+            else                                      -> true
+        }
+    }
+
+    private fun handleSwipeViewMove(translationY: Float, translationLimit: Int) {
+        val alpha = calculateTranslationAlpha(translationY, translationLimit)
+        backgroundView.alpha = alpha
+        dismissContainer.alpha = alpha
+        overlayView?.alpha = alpha
+    }
+
+    private fun dispatchOverlayTouch(event: MotionEvent): Boolean =
+            overlayView
+                    ?.let { it.isVisible && it.dispatchTouchEvent(event) }
+                    ?: false
+
+    private fun calculateTranslationAlpha(translationY: Float, translationLimit: Int): Float =
+            1.0f - 1.0f / translationLimit.toFloat() / 4f * abs(translationY)
+
+    private fun createSwipeToDismissHandler()
+            : SwipeToDismissHandler = SwipeToDismissHandler(
+            swipeView = dismissContainer,
+            shouldAnimateDismiss = { shouldAnimateDismiss() },
+            onDismiss = { animateClose() },
+            onSwipeViewMove = ::handleSwipeViewMove)
+
+    private fun createSwipeDirectionDetector() =
+            SwipeDirectionDetector(this) { swipeDirection = it }
+
+    private fun createScaleGestureDetector() =
+            ScaleGestureDetector(this, ScaleGestureDetector.SimpleOnScaleGestureListener())
+
+    private fun createGestureDetector() =
+            GestureDetectorCompat(this, object : GestureDetector.SimpleOnGestureListener() {
+                override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
+                    if (isImagePagerIdle) {
+                        handleSingleTap(e, isOverlayWasClicked)
+                    }
+                    return false
+                }
+
+                override fun onDoubleTap(e: MotionEvent?): Boolean {
+                    return super.onDoubleTap(e)
+                }
+            })
+
+    override fun onEvent(event: AttachmentEvents) {
+        if (overlayView is AttachmentEventListener) {
+            (overlayView as? AttachmentEventListener)?.onEvent(event)
+        }
+    }
+
+    protected open fun shouldAnimateDismiss(): Boolean = true
+
+    protected open fun animateClose() {
+        window.statusBarColor = Color.TRANSPARENT
+        finish()
+    }
+
+    fun handle(commands: AttachmentCommands) {
+        (attachmentsAdapter.recyclerView?.findViewHolderForAdapterPosition(currentPosition) as? BaseViewHolder)
+                ?.handleCommand(commands)
+    }
+
+    private fun hideSystemUI() {
+        systemUiVisibility = false
+        // Enables regular immersive mode.
+        // For "lean back" mode, remove SYSTEM_UI_FLAG_IMMERSIVE.
+        // Or for "sticky immersive," replace it with SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+        window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_IMMERSIVE
+                // Set the content to appear under the system bars so that the
+                // content doesn't resize when the system bars hide and show.
+                or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                // Hide the nav bar and status bar
+                or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_FULLSCREEN)
+    }
+
+    // Shows the system bars by removing all the flags
+// except for the ones that make the content appear under the system bars.
+    private fun showSystemUI() {
+        systemUiVisibility = true
+        window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)
+    }
+}

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/AttachmentsAdapter.kt

@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+
+class AttachmentsAdapter : RecyclerView.Adapter<BaseViewHolder>() {
+
+    var attachmentSourceProvider: AttachmentSourceProvider? = null
+        set(value) {
+            field = value
+            notifyDataSetChanged()
+        }
+
+    var recyclerView: RecyclerView? = null
+
+    override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {
+        this.recyclerView = recyclerView
+    }
+
+    override fun onDetachedFromRecyclerView(recyclerView: RecyclerView) {
+        this.recyclerView = null
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseViewHolder {
+        val inflater = LayoutInflater.from(parent.context)
+        val itemView = inflater.inflate(viewType, parent, false)
+        return when (viewType) {
+            R.layout.item_image_attachment          -> ZoomableImageViewHolder(itemView)
+            R.layout.item_animated_image_attachment -> AnimatedImageViewHolder(itemView)
+            R.layout.item_video_attachment          -> VideoViewHolder(itemView)
+            else                                    -> UnsupportedViewHolder(itemView)
+        }
+    }
+
+    override fun getItemViewType(position: Int): Int {
+        val info = attachmentSourceProvider!!.getAttachmentInfoAt(position)
+        return when (info) {
+            is AttachmentInfo.Image         -> R.layout.item_image_attachment
+            is AttachmentInfo.Video         -> R.layout.item_video_attachment
+            is AttachmentInfo.AnimatedImage -> R.layout.item_animated_image_attachment
+//            is AttachmentInfo.Audio         -> TODO()
+//            is AttachmentInfo.File          -> TODO()
+        }
+    }
+
+    override fun getItemCount(): Int {
+        return attachmentSourceProvider?.getItemCount() ?: 0
+    }
+
+    override fun onBindViewHolder(holder: BaseViewHolder, position: Int) {
+        attachmentSourceProvider?.getAttachmentInfoAt(position)?.let {
+            holder.bind(it)
+            when (it) {
+                is AttachmentInfo.Image         -> {
+                    attachmentSourceProvider?.loadImage((holder as ZoomableImageViewHolder).target, it)
+                }
+                is AttachmentInfo.AnimatedImage -> {
+                    attachmentSourceProvider?.loadImage((holder as AnimatedImageViewHolder).target, it)
+                }
+                is AttachmentInfo.Video         -> {
+                    attachmentSourceProvider?.loadVideo((holder as VideoViewHolder).target, it)
+                }
+//                else                            -> {
+// //                }
+            }
+        }
+    }
+
+    override fun onViewAttachedToWindow(holder: BaseViewHolder) {
+        holder.onAttached()
+    }
+
+    override fun onViewRecycled(holder: BaseViewHolder) {
+        holder.onRecycled()
+    }
+
+    override fun onViewDetachedFromWindow(holder: BaseViewHolder) {
+        holder.onDetached()
+    }
+
+    fun isScaled(position: Int): Boolean {
+        val holder = recyclerView?.findViewHolderForAdapterPosition(position)
+        if (holder is ZoomableImageViewHolder) {
+            return holder.touchImageView.attacher.scale > 1f
+        }
+        return false
+    }
+
+    fun onPause(position: Int) {
+        val holder = recyclerView?.findViewHolderForAdapterPosition(position) as? BaseViewHolder
+        holder?.entersBackground()
+    }
+
+    fun onResume(position: Int) {
+        val holder = recyclerView?.findViewHolderForAdapterPosition(position) as? BaseViewHolder
+        holder?.entersForeground()
+    }
+}

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/BaseViewHolder.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.view.View
+import androidx.recyclerview.widget.RecyclerView
+
+abstract class BaseViewHolder constructor(itemView: View) :
+        RecyclerView.ViewHolder(itemView) {
+
+    open fun onRecycled() {
+        boundResourceUid = null
+    }
+
+    open fun onAttached() {}
+    open fun onDetached() {}
+    open fun entersBackground() {}
+    open fun entersForeground() {}
+    open fun onSelected(selected: Boolean) {}
+
+    open fun handleCommand(commands: AttachmentCommands) {}
+
+    var boundResourceUid: String? = null
+
+    open fun bind(attachmentInfo: AttachmentInfo) {
+        boundResourceUid = attachmentInfo.uid
+    }
+}
+
+class UnsupportedViewHolder constructor(itemView: View) :
+        BaseViewHolder(itemView)

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/ImageLoaderTarget.kt

@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.graphics.drawable.Animatable
+import android.graphics.drawable.Drawable
+import android.widget.ImageView
+import android.widget.LinearLayout
+import androidx.core.view.isVisible
+import androidx.core.view.updateLayoutParams
+
+interface ImageLoaderTarget {
+
+    fun contextView(): ImageView
+
+    fun onResourceLoading(uid: String, placeholder: Drawable?)
+
+    fun onLoadFailed(uid: String, errorDrawable: Drawable?)
+
+    fun onResourceCleared(uid: String, placeholder: Drawable?)
+
+    fun onResourceReady(uid: String, resource: Drawable)
+}
+
+internal class DefaultImageLoaderTarget(val holder: AnimatedImageViewHolder, private val contextView: ImageView)
+    : ImageLoaderTarget {
+    override fun contextView(): ImageView {
+        return contextView
+    }
+
+    override fun onResourceLoading(uid: String, placeholder: Drawable?) {
+        if (holder.boundResourceUid != uid) return
+        holder.imageLoaderProgress.isVisible = true
+    }
+
+    override fun onLoadFailed(uid: String, errorDrawable: Drawable?) {
+        if (holder.boundResourceUid != uid) return
+        holder.imageLoaderProgress.isVisible = false
+    }
+
+    override fun onResourceCleared(uid: String, placeholder: Drawable?) {
+        if (holder.boundResourceUid != uid) return
+        holder.touchImageView.setImageDrawable(placeholder)
+    }
+
+    override fun onResourceReady(uid: String, resource: Drawable) {
+        if (holder.boundResourceUid != uid) return
+        holder.imageLoaderProgress.isVisible = false
+        // Glide mess up the view size :/
+        holder.touchImageView.updateLayoutParams {
+            width = LinearLayout.LayoutParams.MATCH_PARENT
+            height = LinearLayout.LayoutParams.MATCH_PARENT
+        }
+        holder.touchImageView.setImageDrawable(resource)
+        if (resource is Animatable) {
+            resource.start()
+        }
+    }
+
+    internal class ZoomableImageTarget(val holder: ZoomableImageViewHolder, private val contextView: ImageView) : ImageLoaderTarget {
+        override fun contextView() = contextView
+
+        override fun onResourceLoading(uid: String, placeholder: Drawable?) {
+            if (holder.boundResourceUid != uid) return
+            holder.imageLoaderProgress.isVisible = true
+        }
+
+        override fun onLoadFailed(uid: String, errorDrawable: Drawable?) {
+            if (holder.boundResourceUid != uid) return
+            holder.imageLoaderProgress.isVisible = false
+        }
+
+        override fun onResourceCleared(uid: String, placeholder: Drawable?) {
+            if (holder.boundResourceUid != uid) return
+            holder.touchImageView.setImageDrawable(placeholder)
+        }
+
+        override fun onResourceReady(uid: String, resource: Drawable) {
+            if (holder.boundResourceUid != uid) return
+            holder.imageLoaderProgress.isVisible = false
+            // Glide mess up the view size :/
+            holder.touchImageView.updateLayoutParams {
+                width = LinearLayout.LayoutParams.MATCH_PARENT
+                height = LinearLayout.LayoutParams.MATCH_PARENT
+            }
+            holder.touchImageView.setImageDrawable(resource)
+        }
+    }
+}

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/SwipeDirection.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ * Copyright (C) 2018 stfalcon.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+sealed class SwipeDirection {
+    object NotDetected : SwipeDirection()
+    object Up : SwipeDirection()
+    object Down : SwipeDirection()
+    object Left : SwipeDirection()
+    object Right : SwipeDirection()
+
+    companion object {
+        fun fromAngle(angle: Double): SwipeDirection {
+            return when (angle) {
+                in 0.0..45.0    -> Right
+                in 45.0..135.0  -> Up
+                in 135.0..225.0 -> Left
+                in 225.0..315.0 -> Down
+                in 315.0..360.0 -> Right
+                else            -> NotDetected
+            }
+        }
+    }
+}

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/SwipeDirectionDetector.kt

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ * Copyright (C) 2018 stfalcon.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.content.Context
+import android.view.MotionEvent
+import kotlin.math.sqrt
+
+class SwipeDirectionDetector(
+        context: Context,
+        private val onDirectionDetected: (SwipeDirection) -> Unit
+) {
+
+    private val touchSlop: Int = android.view.ViewConfiguration.get(context).scaledTouchSlop
+    private var startX: Float = 0f
+    private var startY: Float = 0f
+    private var isDetected: Boolean = false
+
+    fun handleTouchEvent(event: MotionEvent) {
+        when (event.action) {
+            MotionEvent.ACTION_DOWN                          -> {
+                startX = event.x
+                startY = event.y
+            }
+            MotionEvent.ACTION_CANCEL, MotionEvent.ACTION_UP -> {
+                if (!isDetected) {
+                    onDirectionDetected(SwipeDirection.NotDetected)
+                }
+                startY = 0.0f
+                startX = startY
+                isDetected = false
+            }
+            MotionEvent.ACTION_MOVE                          -> if (!isDetected && getEventDistance(event) > touchSlop) {
+                isDetected = true
+                onDirectionDetected(getDirection(startX, startY, event.x, event.y))
+            }
+        }
+    }
+
+    /**
+     * Given two points in the plane p1=(x1, x2) and p2=(y1, y1), this method
+     * returns the direction that an arrow pointing from p1 to p2 would have.
+     *
+     * @param x1 the x position of the first point
+     * @param y1 the y position of the first point
+     * @param x2 the x position of the second point
+     * @param y2 the y position of the second point
+     * @return the direction
+     */
+    private fun getDirection(x1: Float, y1: Float, x2: Float, y2: Float): SwipeDirection {
+        val angle = getAngle(x1, y1, x2, y2)
+        return SwipeDirection.fromAngle(angle)
+    }
+
+    /**
+     * Finds the angle between two points in the plane (x1,y1) and (x2, y2)
+     * The angle is measured with 0/360 being the X-axis to the right, angles
+     * increase counter clockwise.
+     *
+     * @param x1 the x position of the first point
+     * @param y1 the y position of the first point
+     * @param x2 the x position of the second point
+     * @param y2 the y position of the second point
+     * @return the angle between two points
+     */
+    private fun getAngle(x1: Float, y1: Float, x2: Float, y2: Float): Double {
+        val rad = Math.atan2((y1 - y2).toDouble(), (x2 - x1).toDouble()) + Math.PI
+        return (rad * 180 / Math.PI + 180) % 360
+    }
+
+    private fun getEventDistance(ev: MotionEvent): Float {
+        val dx = ev.getX(0) - startX
+        val dy = ev.getY(0) - startY
+        return sqrt((dx * dx + dy * dy).toDouble()).toFloat()
+    }
+}

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/SwipeToDismissHandler.kt

@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ * Copyright (C) 2018 stfalcon.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
+import android.annotation.SuppressLint
+import android.graphics.Rect
+import android.view.MotionEvent
+import android.view.View
+import android.view.ViewPropertyAnimator
+import android.view.animation.AccelerateInterpolator
+
+class SwipeToDismissHandler(
+        private val swipeView: View,
+        private val onDismiss: () -> Unit,
+        private val onSwipeViewMove: (translationY: Float, translationLimit: Int) -> Unit,
+        private val shouldAnimateDismiss: () -> Boolean
+) : View.OnTouchListener {
+
+    companion object {
+        private const val ANIMATION_DURATION = 200L
+    }
+
+    var translationLimit: Int = swipeView.height / 4
+    private var isTracking = false
+    private var startY: Float = 0f
+
+    @SuppressLint("ClickableViewAccessibility")
+    override fun onTouch(v: View, event: MotionEvent): Boolean {
+        when (event.action) {
+            MotionEvent.ACTION_DOWN                          -> {
+                if (swipeView.hitRect.contains(event.x.toInt(), event.y.toInt())) {
+                    isTracking = true
+                }
+                startY = event.y
+                return true
+            }
+            MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
+                if (isTracking) {
+                    isTracking = false
+                    onTrackingEnd(v.height)
+                }
+                return true
+            }
+            MotionEvent.ACTION_MOVE                          -> {
+                if (isTracking) {
+                    val translationY = event.y - startY
+                    swipeView.translationY = translationY
+                    onSwipeViewMove(translationY, translationLimit)
+                }
+                return true
+            }
+            else                                             -> {
+                return false
+            }
+        }
+    }
+
+    internal fun initiateDismissToBottom() {
+        animateTranslation(swipeView.height.toFloat())
+    }
+
+    private fun onTrackingEnd(parentHeight: Int) {
+        val animateTo = when {
+            swipeView.translationY < -translationLimit -> -parentHeight.toFloat()
+            swipeView.translationY > translationLimit  -> parentHeight.toFloat()
+            else                                       -> 0f
+        }
+
+        if (animateTo != 0f && !shouldAnimateDismiss()) {
+            onDismiss()
+        } else {
+            animateTranslation(animateTo)
+        }
+    }
+
+    private fun animateTranslation(translationTo: Float) {
+        swipeView.animate()
+                .translationY(translationTo)
+                .setDuration(ANIMATION_DURATION)
+                .setInterpolator(AccelerateInterpolator())
+                .setUpdateListener { onSwipeViewMove(swipeView.translationY, translationLimit) }
+                .setAnimatorListener(onAnimationEnd = {
+                    if (translationTo != 0f) {
+                        onDismiss()
+                    }
+
+                    // remove the update listener, otherwise it will be saved on the next animation execution:
+                    swipeView.animate().setUpdateListener(null)
+                })
+                .start()
+    }
+}
+
+internal fun ViewPropertyAnimator.setAnimatorListener(
+        onAnimationEnd: ((Animator?) -> Unit)? = null,
+        onAnimationStart: ((Animator?) -> Unit)? = null
+) = this.setListener(
+        object : AnimatorListenerAdapter() {
+            override fun onAnimationEnd(animation: Animator?) {
+                onAnimationEnd?.invoke(animation)
+            }
+
+            override fun onAnimationStart(animation: Animator?) {
+                onAnimationStart?.invoke(animation)
+            }
+        })
+
+internal val View?.hitRect: Rect
+    get() = Rect().also { this?.getHitRect(it) }

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/VideoLoaderTarget.kt

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.graphics.drawable.Drawable
+import android.widget.ImageView
+import androidx.core.view.isVisible
+import java.io.File
+
+interface VideoLoaderTarget {
+    fun contextView(): ImageView
+
+    fun onThumbnailResourceLoading(uid: String, placeholder: Drawable?)
+
+    fun onThumbnailLoadFailed(uid: String, errorDrawable: Drawable?)
+
+    fun onThumbnailResourceCleared(uid: String, placeholder: Drawable?)
+
+    fun onThumbnailResourceReady(uid: String, resource: Drawable)
+
+    fun onVideoFileLoading(uid: String)
+    fun onVideoFileLoadFailed(uid: String)
+    fun onVideoFileReady(uid: String, file: File)
+}
+
+internal class DefaultVideoLoaderTarget(val holder: VideoViewHolder, private val contextView: ImageView) : VideoLoaderTarget {
+    override fun contextView(): ImageView = contextView
+
+    override fun onThumbnailResourceLoading(uid: String, placeholder: Drawable?) {
+    }
+
+    override fun onThumbnailLoadFailed(uid: String, errorDrawable: Drawable?) {
+    }
+
+    override fun onThumbnailResourceCleared(uid: String, placeholder: Drawable?) {
+    }
+
+    override fun onThumbnailResourceReady(uid: String, resource: Drawable) {
+        if (holder.boundResourceUid != uid) return
+        holder.thumbnailImage.setImageDrawable(resource)
+    }
+
+    override fun onVideoFileLoading(uid: String) {
+        if (holder.boundResourceUid != uid) return
+        holder.thumbnailImage.isVisible = true
+        holder.loaderProgressBar.isVisible = true
+        holder.videoView.isVisible = false
+    }
+
+    override fun onVideoFileLoadFailed(uid: String) {
+        if (holder.boundResourceUid != uid) return
+        holder.videoFileLoadError()
+    }
+
+    override fun onVideoFileReady(uid: String, file: File) {
+        if (holder.boundResourceUid != uid) return
+        holder.thumbnailImage.isVisible = false
+        holder.loaderProgressBar.isVisible = false
+        holder.videoView.isVisible = true
+        holder.videoReady(file)
+    }
+}

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/VideoViewHolder.kt

@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.view.View
+import android.widget.ImageView
+import android.widget.ProgressBar
+import android.widget.TextView
+import android.widget.VideoView
+import androidx.core.view.isVisible
+import io.reactivex.Observable
+import io.reactivex.android.schedulers.AndroidSchedulers
+import io.reactivex.disposables.Disposable
+import java.io.File
+import java.lang.ref.WeakReference
+import java.util.concurrent.TimeUnit
+
+// TODO, it would be probably better to use a unique media player
+// for better customization and control
+// But for now VideoView is enough, it released player when detached, we use a timer to update progress
+class VideoViewHolder constructor(itemView: View) :
+        BaseViewHolder(itemView) {
+
+    private var isSelected = false
+    private var mVideoPath: String? = null
+    private var progressDisposable: Disposable? = null
+    private var progress: Int = 0
+    private var wasPaused = false
+
+    var eventListener: WeakReference<AttachmentEventListener>? = null
+
+    val thumbnailImage: ImageView = itemView.findViewById(R.id.videoThumbnailImage)
+    val videoView: VideoView = itemView.findViewById(R.id.videoView)
+    val loaderProgressBar: ProgressBar = itemView.findViewById(R.id.videoLoaderProgress)
+    val videoControlIcon: ImageView = itemView.findViewById(R.id.videoControlIcon)
+    val errorTextView: TextView = itemView.findViewById(R.id.videoMediaViewerErrorView)
+
+    internal val target = DefaultVideoLoaderTarget(this, thumbnailImage)
+
+    override fun onRecycled() {
+        super.onRecycled()
+        progressDisposable?.dispose()
+        progressDisposable = null
+        mVideoPath = null
+    }
+
+    fun videoReady(file: File) {
+        mVideoPath = file.path
+        if (isSelected) {
+            startPlaying()
+        }
+    }
+
+    fun videoFileLoadError() {
+    }
+
+    override fun entersBackground() {
+        if (videoView.isPlaying) {
+            progress = videoView.currentPosition
+            progressDisposable?.dispose()
+            progressDisposable = null
+            videoView.stopPlayback()
+            videoView.pause()
+        }
+    }
+
+    override fun entersForeground() {
+        onSelected(isSelected)
+    }
+
+    override fun onSelected(selected: Boolean) {
+        if (!selected) {
+            if (videoView.isPlaying) {
+                progress = videoView.currentPosition
+                videoView.stopPlayback()
+            } else {
+                progress = 0
+            }
+            progressDisposable?.dispose()
+            progressDisposable = null
+        } else {
+            if (mVideoPath != null) {
+                startPlaying()
+            }
+        }
+        isSelected = true
+    }
+
+    private fun startPlaying() {
+        thumbnailImage.isVisible = false
+        loaderProgressBar.isVisible = false
+        videoView.isVisible = true
+
+        videoView.setOnPreparedListener {
+            progressDisposable?.dispose()
+            progressDisposable = Observable.interval(100, TimeUnit.MILLISECONDS)
+                    .timeInterval()
+                    .observeOn(AndroidSchedulers.mainThread())
+                    .subscribe {
+                        val duration = videoView.duration
+                        val progress = videoView.currentPosition
+                        val isPlaying = videoView.isPlaying
+//                        Log.v("FOO", "isPlaying $isPlaying $progress/$duration")
+                        eventListener?.get()?.onEvent(AttachmentEvents.VideoEvent(isPlaying, progress, duration))
+                    }
+        }
+
+        videoView.setVideoPath(mVideoPath)
+        if (!wasPaused) {
+            videoView.start()
+            if (progress > 0) {
+                videoView.seekTo(progress)
+            }
+        }
+    }
+
+    override fun handleCommand(commands: AttachmentCommands) {
+        if (!isSelected) return
+        when (commands) {
+            AttachmentCommands.StartVideo -> {
+                wasPaused = false
+                videoView.start()
+            }
+            AttachmentCommands.PauseVideo -> {
+                wasPaused = true
+                videoView.pause()
+            }
+            is AttachmentCommands.SeekTo  -> {
+                val duration = videoView.duration
+                if (duration > 0) {
+                    val seekDuration = duration * (commands.percentProgress / 100f)
+                    videoView.seekTo(seekDuration.toInt())
+                }
+            }
+        }
+    }
+
+    override fun bind(attachmentInfo: AttachmentInfo) {
+        super.bind(attachmentInfo)
+        progress = 0
+        wasPaused = false
+    }
+}

attachment-viewer/src/main/java/im/vector/riotx/attachmentviewer/ZoomableImageViewHolder.kt

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.attachmentviewer
+
+import android.view.View
+import android.widget.ProgressBar
+import com.github.chrisbanes.photoview.PhotoView
+
+class ZoomableImageViewHolder constructor(itemView: View) :
+        BaseViewHolder(itemView) {
+
+    val touchImageView: PhotoView = itemView.findViewById(R.id.touchImageView)
+    val imageLoaderProgress: ProgressBar = itemView.findViewById(R.id.imageLoaderProgress)
+
+    init {
+        touchImageView.setAllowParentInterceptOnEdge(false)
+        touchImageView.setOnScaleChangeListener { scaleFactor, _, _ ->
+            // Log.v("ATTACHEMENTS", "scaleFactor $scaleFactor")
+            // It's a bit annoying but when you pitch down the scaling
+            // is not exactly one :/
+            touchImageView.setAllowParentInterceptOnEdge(scaleFactor <= 1.0008f)
+        }
+        touchImageView.setScale(1.0f, true)
+        touchImageView.setAllowParentInterceptOnEdge(true)
+    }
+
+    internal val target = DefaultImageLoaderTarget.ZoomableImageTarget(this, touchImageView)
+}

attachment-viewer/src/main/res/layout/activity_attachment_viewer.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/rootContainer"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".AttachmentViewerActivity">
+
+    <View
+        android:id="@+id/backgroundView"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:alpha="1"
+        android:background="@android:color/black" />
+
+    <FrameLayout
+        android:id="@+id/dismissContainer"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <FrameLayout
+            android:id="@+id/transitionImageContainer"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            tools:ignore="UselessParent"
+            tools:visibility="invisible">
+
+            <ImageView
+                android:id="@+id/transitionImageView"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                tools:ignore="ContentDescription" />
+
+        </FrameLayout>
+
+        <androidx.viewpager2.widget.ViewPager2
+            android:id="@+id/attachmentPager"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:background="@android:color/transparent"
+            android:orientation="horizontal"
+            android:visibility="visible" />
+
+    </FrameLayout>
+
+</FrameLayout>

attachment-viewer/src/main/res/layout/item_animated_image_attachment.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <ImageView
+        android:id="@+id/imageView"
+        android:visibility="visible"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+    <ProgressBar
+        android:layout_centerInParent="true"
+        android:id="@+id/imageLoaderProgress"
+        style="?android:attr/progressBarStyle"
+        android:layout_width="40dp"
+        android:layout_height="40dp"
+        android:visibility="visible"
+        tools:visibility="gone" />
+
+</RelativeLayout>

attachment-viewer/src/main/res/layout/item_image_attachment.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <com.github.chrisbanes.photoview.PhotoView
+        android:id="@+id/touchImageView"
+        android:visibility="visible"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+    <ProgressBar
+        android:layout_centerInParent="true"
+        android:id="@+id/imageLoaderProgress"
+        style="?android:attr/progressBarStyle"
+        android:layout_width="40dp"
+        android:layout_height="40dp"
+        android:visibility="visible"
+        tools:visibility="gone" />
+
+</RelativeLayout>

attachment-viewer/src/main/res/layout/item_video_attachment.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <ImageView
+        android:id="@+id/videoThumbnailImage"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_gravity="center"
+        android:scaleType="centerInside" />
+
+    <VideoView
+        android:id="@+id/videoView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_centerInParent="true" />
+
+    <ImageView
+        android:id="@+id/videoControlIcon"
+        android:layout_centerInParent="true"
+        android:visibility="gone"
+        tools:visibility="visible"
+        android:layout_width="44dp"
+        android:layout_height="44dp"
+        />
+
+    <ProgressBar
+        android:layout_centerInParent="true"
+        android:id="@+id/videoLoaderProgress"
+        style="?android:attr/progressBarStyle"
+        android:layout_width="40dp"
+        android:layout_height="40dp"
+        android:visibility="invisible"
+        tools:visibility="visible" />
+
+    <TextView
+        android:id="@+id/videoMediaViewerErrorView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerInParent="true"
+        android:layout_margin="16dp"
+        android:textSize="16sp"
+        android:visibility="gone"
+        tools:text="Error"
+        tools:visibility="visible" />
+
+</RelativeLayout>

attachment-viewer/src/main/res/layout/view_image_attachment.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/design_default_color_primary">
+
+    <TextView
+        android:id="@+id/testPage"
+        android:layout_centerInParent="true"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="1"
+        android:textSize="80sp"
+        android:textStyle="bold" />
+
+
+</RelativeLayout>

build.gradle

@@ -39,6 +39,8 @@ allprojects {
                 includeGroupByRegex "com\\.github\\.yalantis"
                 // JsonViewer
                 includeGroupByRegex 'com\\.github\\.BillCarsonFr'
+                // PhotoView
+                includeGroupByRegex 'com\\.github\\.chrisbanes'
             }
         }
         maven {

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/timeline/TimelineService.kt

@@ -39,4 +39,6 @@ interface TimelineService {
     fun getTimeLineEvent(eventId: String): TimelineEvent?
 
     fun getTimeLineEventLive(eventId: String): LiveData<Optional<TimelineEvent>>
+
+    fun getAttachmentMessages() : List<TimelineEvent>
 }

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/timeline/DefaultTimelineService.kt

@@ -21,19 +21,25 @@ import androidx.lifecycle.Transformations
 import com.squareup.inject.assisted.Assisted
 import com.squareup.inject.assisted.AssistedInject
 import com.zhuinden.monarchy.Monarchy
+import im.vector.matrix.android.api.session.events.model.isImageMessage
+import im.vector.matrix.android.api.session.events.model.isVideoMessage
 import im.vector.matrix.android.api.session.room.timeline.Timeline
 import im.vector.matrix.android.api.session.room.timeline.TimelineEvent
 import im.vector.matrix.android.api.session.room.timeline.TimelineService
 import im.vector.matrix.android.api.session.room.timeline.TimelineSettings
 import im.vector.matrix.android.api.util.Optional
 import im.vector.matrix.android.api.util.toOptional
+import im.vector.matrix.android.internal.crypto.store.db.doWithRealm
 import im.vector.matrix.android.internal.database.mapper.ReadReceiptsSummaryMapper
 import im.vector.matrix.android.internal.database.mapper.TimelineEventMapper
 import im.vector.matrix.android.internal.database.model.TimelineEventEntity
+import im.vector.matrix.android.internal.database.model.TimelineEventEntityFields
 import im.vector.matrix.android.internal.database.query.where
 import im.vector.matrix.android.internal.di.SessionDatabase
 import im.vector.matrix.android.internal.task.TaskExecutor
 import im.vector.matrix.android.internal.util.fetchCopyMap
+import io.realm.Sort
+import io.realm.kotlin.where
 import org.greenrobot.eventbus.EventBus
 
 internal class DefaultTimelineService @AssistedInject constructor(@Assisted private val roomId: String,
@@ -88,4 +94,16 @@ internal class DefaultTimelineService @AssistedInject constructor(@Assisted priv
             events.firstOrNull().toOptional()
         }
     }
+
+    override fun getAttachmentMessages(): List<TimelineEvent> {
+        // TODO pretty bad query.. maybe we should denormalize clear type in base?
+        return doWithRealm(monarchy.realmConfiguration) { realm ->
+            realm.where<TimelineEventEntity>()
+                    .equalTo(TimelineEventEntityFields.ROOM_ID, roomId)
+                    .sort(TimelineEventEntityFields.DISPLAY_INDEX, Sort.ASCENDING)
+                    .findAll()
+                    ?.mapNotNull { timelineEventMapper.map(it).takeIf { it.root.isImageMessage() || it.root.isVideoMessage() } }
+                    ?: emptyList()
+        }
+    }
 }

settings.gradle

@@ -1,2 +1,6 @@
-include ':vector', ':matrix-sdk-android', ':matrix-sdk-android-rx', ':diff-match-patch'
+include ':vector'
+include ':matrix-sdk-android'
+include ':matrix-sdk-android-rx'
+include ':diff-match-patch'
+include ':attachment-viewer'
 include ':multipicker'

vector/build.gradle

@@ -279,6 +279,7 @@ dependencies {
     implementation project(":matrix-sdk-android-rx")
     implementation project(":diff-match-patch")
     implementation project(":multipicker")
+    implementation project(":attachment-viewer")
     implementation 'com.android.support:multidex:1.0.3'
 
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
@@ -368,6 +369,10 @@ dependencies {
     implementation "com.github.piasy:GlideImageLoader:$big_image_viewer_version"
     implementation "com.github.piasy:ProgressPieIndicator:$big_image_viewer_version"
     implementation "com.github.piasy:GlideImageViewFactory:$big_image_viewer_version"
+
+    // implementation 'com.github.MikeOrtiz:TouchImageView:3.0.2'
+    implementation 'com.github.chrisbanes:PhotoView:2.0.0'
+
     implementation "com.github.bumptech.glide:glide:$glide_version"
     kapt "com.github.bumptech.glide:compiler:$glide_version"
     implementation 'com.danikula:videocache:2.7.1'

vector/src/main/AndroidManifest.xml

@@ -85,6 +85,11 @@
             </intent-filter>
         </activity>
         <activity android:name=".features.media.ImageMediaViewerActivity" />
+
+        <activity
+            android:name=".features.media.VectorAttachmentViewerActivity"
+            android:theme="@style/AppTheme.Transparent" />
+
         <activity android:name=".features.media.BigImageViewerActivity" />
         <activity
             android:name=".features.rageshake.BugReportActivity"

vector/src/main/assets/open_source_licenses.html

@@ -389,6 +389,9 @@ SOFTWARE.
     <li>
         <b>BillCarsonFr/JsonViewer</b>
     </li>
+    <li>
+        <b>Copyright (C) 2018 stfalcon.com</b>
+    </li>
 </ul>
 <pre>
 Apache License

vector/src/main/java/im/vector/riotx/core/di/ScreenComponent.kt

@@ -48,6 +48,7 @@ import im.vector.riotx.features.invite.InviteUsersToRoomActivity
 import im.vector.riotx.features.invite.VectorInviteView
 import im.vector.riotx.features.link.LinkHandlerActivity
 import im.vector.riotx.features.login.LoginActivity
+import im.vector.riotx.features.media.VectorAttachmentViewerActivity
 import im.vector.riotx.features.media.BigImageViewerActivity
 import im.vector.riotx.features.media.ImageMediaViewerActivity
 import im.vector.riotx.features.media.VideoMediaViewerActivity
@@ -135,6 +136,7 @@ interface ScreenComponent {
     fun inject(activity: ReviewTermsActivity)
     fun inject(activity: WidgetActivity)
     fun inject(activity: VectorCallActivity)
+    fun inject(activity: VectorAttachmentViewerActivity)
 
     /* ==========================================================================================
      * BottomSheets

vector/src/main/java/im/vector/riotx/features/home/room/detail/RoomDetailFragment.kt

@@ -1171,14 +1171,27 @@ class RoomDetailFragment @Inject constructor(
     }
 
     override fun onImageMessageClicked(messageImageContent: MessageImageInfoContent, mediaData: ImageContentRenderer.Data, view: View) {
-        navigator.openImageViewer(requireActivity(), mediaData, view) { pairs ->
+        navigator.openMediaViewer(
+                activity = requireActivity(),
+                roomId = roomDetailArgs.roomId,
+                mediaData = mediaData,
+                view = view
+        ) { pairs ->
             pairs.add(Pair(roomToolbar, ViewCompat.getTransitionName(roomToolbar) ?: ""))
             pairs.add(Pair(composerLayout, ViewCompat.getTransitionName(composerLayout) ?: ""))
         }
     }
 
     override fun onVideoMessageClicked(messageVideoContent: MessageVideoContent, mediaData: VideoContentRenderer.Data, view: View) {
-        navigator.openVideoViewer(requireActivity(), mediaData)
+        navigator.openMediaViewer(
+                activity = requireActivity(),
+                roomId = roomDetailArgs.roomId,
+                mediaData = mediaData,
+                view = view
+        ) { pairs ->
+            pairs.add(Pair(roomToolbar, ViewCompat.getTransitionName(roomToolbar) ?: ""))
+            pairs.add(Pair(composerLayout, ViewCompat.getTransitionName(composerLayout) ?: ""))
+        }
     }
 
 //    override fun onFileMessageClicked(eventId: String, messageFileContent: MessageFileContent) {

vector/src/main/java/im/vector/riotx/features/home/room/detail/timeline/factory/MessageItemFactory.kt

@@ -337,7 +337,7 @@ class MessageItemFactory @Inject constructor(
                 .playable(true)
                 .highlighted(highlight)
                 .mediaData(thumbnailData)
-                .clickListener { view -> callback?.onVideoMessageClicked(messageContent, videoData, view) }
+                .clickListener { view -> callback?.onVideoMessageClicked(messageContent, videoData, view.findViewById(R.id.messageThumbnailView)) }
     }
 
     private fun buildItemForTextContent(messageContent: MessageTextContent,

vector/src/main/java/im/vector/riotx/features/media/AttachmentOverlayView.kt

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.features.media
+
+import android.content.Context
+import android.graphics.Color
+import android.util.AttributeSet
+import android.view.View
+import android.widget.ImageView
+import android.widget.SeekBar
+import android.widget.TextView
+import androidx.constraintlayout.widget.ConstraintLayout
+import androidx.constraintlayout.widget.Group
+import im.vector.riotx.R
+import im.vector.riotx.attachmentviewer.AttachmentEventListener
+import im.vector.riotx.attachmentviewer.AttachmentEvents
+
+class AttachmentOverlayView @JvmOverloads constructor(
+        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+) : ConstraintLayout(context, attrs, defStyleAttr), AttachmentEventListener {
+
+    var onShareCallback: (() -> Unit)? = null
+    var onBack: (() -> Unit)? = null
+    var onPlayPause: ((play: Boolean) -> Unit)? = null
+    var videoSeekTo: ((progress: Int) -> Unit)? = null
+
+    private val counterTextView: TextView
+    private val infoTextView: TextView
+    private val shareImage: ImageView
+    private val overlayPlayPauseButton: ImageView
+    private val overlaySeekBar: SeekBar
+
+    var isPlaying = false
+
+    val videoControlsGroup: Group
+
+    var suspendSeekBarUpdate = false
+
+    init {
+        View.inflate(context, R.layout.merge_image_attachment_overlay, this)
+        setBackgroundColor(Color.TRANSPARENT)
+        counterTextView = findViewById(R.id.overlayCounterText)
+        infoTextView = findViewById(R.id.overlayInfoText)
+        shareImage = findViewById(R.id.overlayShareButton)
+        videoControlsGroup = findViewById(R.id.overlayVideoControlsGroup)
+        overlayPlayPauseButton = findViewById(R.id.overlayPlayPauseButton)
+        overlaySeekBar = findViewById(R.id.overlaySeekBar)
+        findViewById<ImageView>(R.id.overlayBackButton).setOnClickListener {
+            onBack?.invoke()
+        }
+        findViewById<ImageView>(R.id.overlayShareButton).setOnClickListener {
+            onShareCallback?.invoke()
+        }
+        findViewById<ImageView>(R.id.overlayPlayPauseButton).setOnClickListener {
+            onPlayPause?.invoke(!isPlaying)
+        }
+
+        overlaySeekBar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
+            override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
+                if (fromUser) {
+                    videoSeekTo?.invoke(progress)
+                }
+            }
+
+            override fun onStartTrackingTouch(seekBar: SeekBar?) {
+                suspendSeekBarUpdate = true
+            }
+
+            override fun onStopTrackingTouch(seekBar: SeekBar?) {
+                suspendSeekBarUpdate = false
+            }
+        })
+    }
+
+    fun updateWith(counter: String, senderInfo: String) {
+        counterTextView.text = counter
+        infoTextView.text = senderInfo
+    }
+
+    override fun onEvent(event: AttachmentEvents) {
+        when (event) {
+            is AttachmentEvents.VideoEvent -> {
+                overlayPlayPauseButton.setImageResource(if (!event.isPlaying) R.drawable.ic_play_arrow else R.drawable.ic_pause)
+                if (!suspendSeekBarUpdate) {
+                    val safeDuration = (if (event.duration == 0) 100 else event.duration).toFloat()
+                    val percent = ((event.progress / safeDuration) * 100f).toInt().coerceAtMost(100)
+                    isPlaying = event.isPlaying
+                    overlaySeekBar.progress = percent
+                }
+            }
+        }
+    }
+}

vector/src/main/java/im/vector/riotx/features/media/BaseAttachmentProvider.kt

@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.features.media
+
+import android.content.Context
+import android.graphics.drawable.Drawable
+import android.view.View
+import android.widget.ImageView
+import com.bumptech.glide.request.target.CustomViewTarget
+import com.bumptech.glide.request.transition.Transition
+import im.vector.matrix.android.api.MatrixCallback
+import im.vector.matrix.android.api.session.file.FileService
+import im.vector.riotx.attachmentviewer.AttachmentInfo
+import im.vector.riotx.attachmentviewer.AttachmentSourceProvider
+import im.vector.riotx.attachmentviewer.ImageLoaderTarget
+import im.vector.riotx.attachmentviewer.VideoLoaderTarget
+import java.io.File
+
+abstract class BaseAttachmentProvider(val imageContentRenderer: ImageContentRenderer, val fileService: FileService) : AttachmentSourceProvider {
+
+    interface InteractionListener {
+        fun onDismissTapped()
+        fun onShareTapped()
+        fun onPlayPause(play: Boolean)
+        fun videoSeekTo(percent: Int)
+    }
+
+    var interactionListener: InteractionListener? = null
+
+    protected var overlayView: AttachmentOverlayView? = null
+
+    override fun overlayViewAtPosition(context: Context, position: Int): View? {
+        if (position == -1) return null
+        if (overlayView == null) {
+            overlayView = AttachmentOverlayView(context)
+            overlayView?.onBack = {
+                interactionListener?.onDismissTapped()
+            }
+            overlayView?.onShareCallback = {
+                interactionListener?.onShareTapped()
+            }
+            overlayView?.onPlayPause = { play ->
+                interactionListener?.onPlayPause(play)
+            }
+            overlayView?.videoSeekTo = { percent ->
+                interactionListener?.videoSeekTo(percent)
+            }
+        }
+        return overlayView
+    }
+
+    override fun loadImage(target: ImageLoaderTarget, info: AttachmentInfo.Image) {
+        (info.data as? ImageContentRenderer.Data)?.let {
+            imageContentRenderer.render(it, target.contextView(), object : CustomViewTarget<ImageView, Drawable>(target.contextView()) {
+                override fun onLoadFailed(errorDrawable: Drawable?) {
+                    target.onLoadFailed(info.uid, errorDrawable)
+                }
+
+                override fun onResourceCleared(placeholder: Drawable?) {
+                    target.onResourceCleared(info.uid, placeholder)
+                }
+
+                override fun onResourceReady(resource: Drawable, transition: Transition<in Drawable>?) {
+                    target.onResourceReady(info.uid, resource)
+                }
+            })
+        }
+    }
+
+    override fun loadImage(target: ImageLoaderTarget, info: AttachmentInfo.AnimatedImage) {
+        (info.data as? ImageContentRenderer.Data)?.let {
+            imageContentRenderer.render(it, target.contextView(), object : CustomViewTarget<ImageView, Drawable>(target.contextView()) {
+                override fun onLoadFailed(errorDrawable: Drawable?) {
+                    target.onLoadFailed(info.uid, errorDrawable)
+                }
+
+                override fun onResourceCleared(placeholder: Drawable?) {
+                    target.onResourceCleared(info.uid, placeholder)
+                }
+
+                override fun onResourceReady(resource: Drawable, transition: Transition<in Drawable>?) {
+                    target.onResourceReady(info.uid, resource)
+                }
+            })
+        }
+    }
+
+    override fun loadVideo(target: VideoLoaderTarget, info: AttachmentInfo.Video) {
+        val data = info.data as? VideoContentRenderer.Data ?: return
+//        videoContentRenderer.render(data,
+//                holder.thumbnailImage,
+//                holder.loaderProgressBar,
+//                holder.videoView,
+//                holder.errorTextView)
+        imageContentRenderer.render(data.thumbnailMediaData, target.contextView(), object : CustomViewTarget<ImageView, Drawable>(target.contextView()) {
+            override fun onLoadFailed(errorDrawable: Drawable?) {
+                target.onThumbnailLoadFailed(info.uid, errorDrawable)
+            }
+
+            override fun onResourceCleared(placeholder: Drawable?) {
+                target.onThumbnailResourceCleared(info.uid, placeholder)
+            }
+
+            override fun onResourceReady(resource: Drawable, transition: Transition<in Drawable>?) {
+                target.onThumbnailResourceReady(info.uid, resource)
+            }
+        })
+
+        target.onVideoFileLoading(info.uid)
+        fileService.downloadFile(
+                downloadMode = FileService.DownloadMode.FOR_INTERNAL_USE,
+                id = data.eventId,
+                mimeType = data.mimeType,
+                elementToDecrypt = data.elementToDecrypt,
+                fileName = data.filename,
+                url = data.url,
+                callback = object : MatrixCallback<File> {
+                    override fun onSuccess(data: File) {
+                        target.onVideoFileReady(info.uid, data)
+                    }
+
+                    override fun onFailure(failure: Throwable) {
+                        target.onVideoFileLoadFailed(info.uid)
+                    }
+                }
+        )
+    }
+
+    override fun clear(id: String) {
+        // TODO("Not yet implemented")
+    }
+
+    abstract fun getFileForSharing(position: Int, callback: ((File?) -> Unit))
+}

vector/src/main/java/im/vector/riotx/features/media/DataAttachmentRoomProvider.kt

@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.features.media
+
+import android.content.Context
+import android.view.View
+import androidx.core.view.isVisible
+import im.vector.matrix.android.api.MatrixCallback
+import im.vector.matrix.android.api.session.events.model.isVideoMessage
+import im.vector.matrix.android.api.session.file.FileService
+import im.vector.matrix.android.api.session.room.Room
+import im.vector.riotx.attachmentviewer.AttachmentInfo
+import im.vector.riotx.core.date.VectorDateFormatter
+import im.vector.riotx.core.extensions.localDateTime
+import java.io.File
+
+class DataAttachmentRoomProvider(
+        private val attachments: List<AttachmentData>,
+        private val room: Room?,
+        private val initialIndex: Int,
+        imageContentRenderer: ImageContentRenderer,
+        private val dateFormatter: VectorDateFormatter,
+        fileService: FileService) : BaseAttachmentProvider(imageContentRenderer, fileService) {
+
+    override fun getItemCount(): Int = attachments.size
+
+    override fun getAttachmentInfoAt(position: Int): AttachmentInfo {
+        return attachments[position].let {
+            when (it) {
+                is ImageContentRenderer.Data -> {
+                    if (it.mimeType == "image/gif") {
+                        AttachmentInfo.AnimatedImage(
+                                uid = it.eventId,
+                                url = it.url ?: "",
+                                data = it
+                        )
+                    } else {
+                        AttachmentInfo.Image(
+                                uid = it.eventId,
+                                url = it.url ?: "",
+                                data = it
+                        )
+                    }
+                }
+                is VideoContentRenderer.Data -> {
+                    AttachmentInfo.Video(
+                            uid = it.eventId,
+                            url = it.url ?: "",
+                            data = it,
+                            thumbnail = AttachmentInfo.Image(
+                                    uid = it.eventId,
+                                    url = it.thumbnailMediaData.url ?: "",
+                                    data = it.thumbnailMediaData
+                            )
+                    )
+                }
+                else                         -> throw IllegalArgumentException()
+            }
+        }
+    }
+
+    override fun overlayViewAtPosition(context: Context, position: Int): View? {
+        super.overlayViewAtPosition(context, position)
+        val item = attachments[position]
+        val timeLineEvent = room?.getTimeLineEvent(item.eventId)
+        if (timeLineEvent != null) {
+            val dateString = timeLineEvent.root.localDateTime().let {
+                "${dateFormatter.formatMessageDay(it)} at ${dateFormatter.formatMessageHour(it)} "
+            }
+            overlayView?.updateWith("${position + 1} of ${attachments.size}", "${timeLineEvent.senderInfo.displayName} $dateString")
+            overlayView?.videoControlsGroup?.isVisible = timeLineEvent.root.isVideoMessage()
+        } else {
+            overlayView?.updateWith("", "")
+        }
+        return overlayView
+    }
+
+    override fun getFileForSharing(position: Int, callback: (File?) -> Unit) {
+        val item = attachments[position]
+        fileService.downloadFile(
+                downloadMode = FileService.DownloadMode.FOR_EXTERNAL_SHARE,
+                id = item.eventId,
+                fileName = item.filename,
+                mimeType = item.mimeType,
+                url = item.url ?: "",
+                elementToDecrypt = item.elementToDecrypt,
+                callback = object : MatrixCallback<File> {
+                    override fun onSuccess(data: File) {
+                        callback(data)
+                    }
+
+                    override fun onFailure(failure: Throwable) {
+                        callback(null)
+                    }
+                }
+        )
+    }
+}

vector/src/main/java/im/vector/riotx/features/media/ImageContentRenderer.kt

@@ -19,11 +19,13 @@ package im.vector.riotx.features.media
 import android.graphics.drawable.Drawable
 import android.net.Uri
 import android.os.Parcelable
+import android.view.View
 import android.widget.ImageView
 import com.bumptech.glide.load.DataSource
 import com.bumptech.glide.load.engine.GlideException
 import com.bumptech.glide.load.resource.bitmap.RoundedCorners
 import com.bumptech.glide.request.RequestListener
+import com.bumptech.glide.request.target.CustomViewTarget
 import com.bumptech.glide.request.target.Target
 import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView.ORIENTATION_USE_EXIF
 import com.github.piasy.biv.view.BigImageView
@@ -42,21 +44,29 @@ import java.io.File
 import javax.inject.Inject
 import kotlin.math.min
 
+interface AttachmentData : Parcelable {
+    val eventId: String
+    val filename: String
+    val mimeType: String?
+    val url: String?
+    val elementToDecrypt: ElementToDecrypt?
+}
+
 class ImageContentRenderer @Inject constructor(private val activeSessionHolder: ActiveSessionHolder,
                                                private val dimensionConverter: DimensionConverter) {
 
     @Parcelize
     data class Data(
-            val eventId: String,
-            val filename: String,
-            val mimeType: String?,
-            val url: String?,
-            val elementToDecrypt: ElementToDecrypt?,
+            override val eventId: String,
+            override val filename: String,
+            override val mimeType: String?,
+            override val url: String?,
+            override val elementToDecrypt: ElementToDecrypt?,
             val height: Int?,
             val maxHeight: Int,
             val width: Int?,
             val maxWidth: Int
-    ) : Parcelable {
+    ) : AttachmentData {
 
         fun isLocalFile() = url.isLocalFile()
     }
@@ -93,6 +103,25 @@ class ImageContentRenderer @Inject constructor(private val activeSessionHolder:
                 .into(imageView)
     }
 
+    fun render(data: Data, contextView: View, target: CustomViewTarget<*, Drawable>) {
+        val req = if (data.elementToDecrypt != null) {
+            // Encrypted image
+            GlideApp
+                    .with(contextView)
+                    .load(data)
+        } else {
+            // Clear image
+            val resolvedUrl = activeSessionHolder.getActiveSession().contentUrlResolver().resolveFullSize(data.url)
+            GlideApp
+                    .with(contextView)
+                    .load(resolvedUrl)
+        }
+
+        req.override(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL)
+                .fitCenter()
+                .into(target)
+    }
+
     fun renderFitTarget(data: Data, mode: Mode, imageView: ImageView, callback: ((Boolean) -> Unit)? = null) {
         val size = processSize(data, mode)
 
@@ -122,6 +151,45 @@ class ImageContentRenderer @Inject constructor(private val activeSessionHolder:
                 .into(imageView)
     }
 
+    fun renderThumbnailDontTransform(data: Data, imageView: ImageView, callback: ((Boolean) -> Unit)? = null) {
+        // a11y
+        imageView.contentDescription = data.filename
+
+        val req = if (data.elementToDecrypt != null) {
+            // Encrypted image
+            GlideApp
+                    .with(imageView)
+                    .load(data)
+        } else {
+            // Clear image
+            val resolvedUrl = activeSessionHolder.getActiveSession().contentUrlResolver().resolveFullSize(data.url)
+            GlideApp
+                    .with(imageView)
+                    .load(resolvedUrl)
+        }
+
+        req.listener(object : RequestListener<Drawable> {
+            override fun onLoadFailed(e: GlideException?,
+                                      model: Any?,
+                                      target: Target<Drawable>?,
+                                      isFirstResource: Boolean): Boolean {
+                callback?.invoke(false)
+                return false
+            }
+
+            override fun onResourceReady(resource: Drawable?,
+                                         model: Any?,
+                                         target: Target<Drawable>?,
+                                         dataSource: DataSource?,
+                                         isFirstResource: Boolean): Boolean {
+                callback?.invoke(true)
+                return false
+            }
+        })
+                .dontTransform()
+                .into(imageView)
+    }
+
     private fun createGlideRequest(data: Data, mode: Mode, imageView: ImageView, size: Size): GlideRequest<Drawable> {
         return if (data.elementToDecrypt != null) {
             // Encrypted image

vector/src/main/java/im/vector/riotx/features/media/ImageMediaViewerActivity.kt

@@ -91,6 +91,8 @@ class ImageMediaViewerActivity : VectorBaseActivity() {
             encryptedImageView.isVisible = false
             // Postpone transaction a bit until thumbnail is loaded
             supportPostponeEnterTransition()
+
+            // We are not passing the exact same image that in the
             imageContentRenderer.renderFitTarget(mediaData, ImageContentRenderer.Mode.THUMBNAIL, imageTransitionView) {
                 // Proceed with transaction
                 scheduleStartPostponedTransition(imageTransitionView)

vector/src/main/java/im/vector/riotx/features/media/RoomEventsAttachmentProvider.kt

@@ -0,0 +1,175 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.features.media
+
+import android.content.Context
+import android.view.View
+import androidx.core.view.isVisible
+import im.vector.matrix.android.api.MatrixCallback
+import im.vector.matrix.android.api.session.Session
+import im.vector.matrix.android.api.session.events.model.isVideoMessage
+import im.vector.matrix.android.api.session.events.model.toModel
+import im.vector.matrix.android.api.session.file.FileService
+import im.vector.matrix.android.api.session.room.Room
+import im.vector.matrix.android.api.session.room.model.message.MessageContent
+import im.vector.matrix.android.api.session.room.model.message.MessageImageContent
+import im.vector.matrix.android.api.session.room.model.message.MessageVideoContent
+import im.vector.matrix.android.api.session.room.model.message.MessageWithAttachmentContent
+import im.vector.matrix.android.api.session.room.model.message.getFileUrl
+import im.vector.matrix.android.api.session.room.timeline.TimelineEvent
+import im.vector.matrix.android.internal.crypto.attachments.toElementToDecrypt
+import im.vector.riotx.attachmentviewer.AttachmentInfo
+import im.vector.riotx.core.date.VectorDateFormatter
+import im.vector.riotx.core.extensions.localDateTime
+import java.io.File
+import javax.inject.Inject
+
+class RoomEventsAttachmentProvider(
+        private val attachments: List<TimelineEvent>,
+        private val initialIndex: Int,
+        imageContentRenderer: ImageContentRenderer,
+        private val dateFormatter: VectorDateFormatter,
+        fileService: FileService
+) : BaseAttachmentProvider(imageContentRenderer, fileService) {
+
+    override fun getItemCount(): Int {
+        return attachments.size
+    }
+
+    override fun getAttachmentInfoAt(position: Int): AttachmentInfo {
+        return attachments[position].let {
+            val content = it.root.getClearContent().toModel<MessageContent>() as? MessageWithAttachmentContent
+            if (content is MessageImageContent) {
+                val data = ImageContentRenderer.Data(
+                        eventId = it.eventId,
+                        filename = content.body,
+                        mimeType = content.mimeType,
+                        url = content.getFileUrl(),
+                        elementToDecrypt = content.encryptedFileInfo?.toElementToDecrypt(),
+                        maxHeight = -1,
+                        maxWidth = -1,
+                        width = null,
+                        height = null
+                )
+                if (content.mimeType == "image/gif") {
+                    AttachmentInfo.AnimatedImage(
+                            uid = it.eventId,
+                            url = content.url ?: "",
+                            data = data
+                    )
+                } else {
+                    AttachmentInfo.Image(
+                            uid = it.eventId,
+                            url = content.url ?: "",
+                            data = data
+                    )
+                }
+            } else if (content is MessageVideoContent) {
+                val thumbnailData = ImageContentRenderer.Data(
+                        eventId = it.eventId,
+                        filename = content.body,
+                        mimeType = content.mimeType,
+                        url = content.videoInfo?.thumbnailFile?.url
+                                ?: content.videoInfo?.thumbnailUrl,
+                        elementToDecrypt = content.videoInfo?.thumbnailFile?.toElementToDecrypt(),
+                        height = content.videoInfo?.height,
+                        maxHeight = -1,
+                        width = content.videoInfo?.width,
+                        maxWidth = -1
+                )
+                val data = VideoContentRenderer.Data(
+                        eventId = it.eventId,
+                        filename = content.body,
+                        mimeType = content.mimeType,
+                        url = content.getFileUrl(),
+                        elementToDecrypt = content.encryptedFileInfo?.toElementToDecrypt(),
+                        thumbnailMediaData = thumbnailData
+                )
+                AttachmentInfo.Video(
+                        uid = it.eventId,
+                        url = content.getFileUrl() ?: "",
+                        data = data,
+                        thumbnail = AttachmentInfo.Image(
+                                uid = it.eventId,
+                                url = content.videoInfo?.thumbnailFile?.url
+                                        ?: content.videoInfo?.thumbnailUrl ?: "",
+                                data = thumbnailData
+
+                        )
+                )
+            } else {
+                AttachmentInfo.Image(
+                        uid = it.eventId,
+                        url = "",
+                        data = null
+                )
+            }
+        }
+    }
+
+    override fun overlayViewAtPosition(context: Context, position: Int): View? {
+        super.overlayViewAtPosition(context, position)
+        val item = attachments[position]
+        val dateString = item.root.localDateTime().let {
+            "${dateFormatter.formatMessageDay(it)} at ${dateFormatter.formatMessageHour(it)} "
+        }
+        overlayView?.updateWith("${position + 1} of ${attachments.size}", "${item.senderInfo.displayName} $dateString")
+        overlayView?.videoControlsGroup?.isVisible = item.root.isVideoMessage()
+        return overlayView
+    }
+
+    override fun getFileForSharing(position: Int, callback: (File?) -> Unit) {
+        attachments[position].let { timelineEvent ->
+
+            val messageContent = timelineEvent.root.getClearContent().toModel<MessageContent>()
+                    as? MessageWithAttachmentContent
+                    ?: return@let
+            fileService.downloadFile(
+                    downloadMode = FileService.DownloadMode.FOR_EXTERNAL_SHARE,
+                    id = timelineEvent.eventId,
+                    fileName = messageContent.body,
+                    mimeType = messageContent.mimeType,
+                    url = messageContent.getFileUrl(),
+                    elementToDecrypt = messageContent.encryptedFileInfo?.toElementToDecrypt(),
+                    callback = object : MatrixCallback<File> {
+                        override fun onSuccess(data: File) {
+                           callback(data)
+                        }
+
+                        override fun onFailure(failure: Throwable) {
+                            callback(null)
+                        }
+                    }
+            )
+        }
+    }
+}
+
+class AttachmentProviderFactory @Inject constructor(
+        private val imageContentRenderer: ImageContentRenderer,
+        private val vectorDateFormatter: VectorDateFormatter,
+        private val session: Session
+) {
+
+    fun createProvider(attachments: List<TimelineEvent>, initialIndex: Int): RoomEventsAttachmentProvider {
+        return RoomEventsAttachmentProvider(attachments, initialIndex, imageContentRenderer, vectorDateFormatter, session.fileService())
+    }
+
+    fun createProvider(attachments: List<AttachmentData>, room: Room?, initialIndex: Int): DataAttachmentRoomProvider {
+        return DataAttachmentRoomProvider(attachments, room, initialIndex, imageContentRenderer, vectorDateFormatter, session.fileService())
+    }
+}

vector/src/main/java/im/vector/riotx/features/media/VectorAttachmentViewerActivity.kt

@@ -0,0 +1,277 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package im.vector.riotx.features.media
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.os.Parcelable
+import android.view.View
+import android.view.ViewTreeObserver
+import androidx.core.app.ActivityCompat
+import androidx.core.content.ContextCompat
+import androidx.core.net.toUri
+import androidx.core.transition.addListener
+import androidx.core.view.ViewCompat
+import androidx.core.view.isInvisible
+import androidx.core.view.isVisible
+import androidx.lifecycle.Lifecycle
+import androidx.transition.Transition
+import im.vector.riotx.R
+import im.vector.riotx.attachmentviewer.AttachmentCommands
+import im.vector.riotx.attachmentviewer.AttachmentViewerActivity
+import im.vector.riotx.core.di.ActiveSessionHolder
+import im.vector.riotx.core.di.DaggerScreenComponent
+import im.vector.riotx.core.di.HasVectorInjector
+import im.vector.riotx.core.di.ScreenComponent
+import im.vector.riotx.core.di.VectorComponent
+import im.vector.riotx.core.intent.getMimeTypeFromUri
+import im.vector.riotx.core.utils.shareMedia
+import im.vector.riotx.features.themes.ActivityOtherThemes
+import im.vector.riotx.features.themes.ThemeUtils
+import kotlinx.android.parcel.Parcelize
+import timber.log.Timber
+import javax.inject.Inject
+import kotlin.system.measureTimeMillis
+
+class VectorAttachmentViewerActivity : AttachmentViewerActivity(), BaseAttachmentProvider.InteractionListener {
+
+    @Parcelize
+    data class Args(
+            val roomId: String?,
+            val eventId: String,
+            val sharedTransitionName: String?
+    ) : Parcelable
+
+    @Inject
+    lateinit var sessionHolder: ActiveSessionHolder
+
+    @Inject
+    lateinit var dataSourceFactory: AttachmentProviderFactory
+
+    @Inject
+    lateinit var imageContentRenderer: ImageContentRenderer
+
+    private lateinit var screenComponent: ScreenComponent
+
+    private var initialIndex = 0
+    private var isAnimatingOut = false
+
+    var currentSourceProvider: BaseAttachmentProvider? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        Timber.i("onCreate Activity ${this.javaClass.simpleName}")
+        val vectorComponent = getVectorComponent()
+        screenComponent = DaggerScreenComponent.factory().create(vectorComponent, this)
+        val timeForInjection = measureTimeMillis {
+            screenComponent.inject(this)
+        }
+        Timber.v("Injecting dependencies into ${javaClass.simpleName} took $timeForInjection ms")
+        ThemeUtils.setActivityTheme(this, getOtherThemes())
+
+        val args = args() ?: throw IllegalArgumentException("Missing arguments")
+
+        if (savedInstanceState == null && addTransitionListener()) {
+            args.sharedTransitionName?.let {
+                ViewCompat.setTransitionName(imageTransitionView, it)
+                transitionImageContainer.isVisible = true
+
+                // Postpone transaction a bit until thumbnail is loaded
+                val mediaData: Parcelable? = intent.getParcelableExtra(EXTRA_IMAGE_DATA)
+                if (mediaData is ImageContentRenderer.Data) {
+                    // will be shown at end of transition
+                    pager2.isInvisible = true
+                    supportPostponeEnterTransition()
+                    imageContentRenderer.renderThumbnailDontTransform(mediaData, imageTransitionView) {
+                        // Proceed with transaction
+                        scheduleStartPostponedTransition(imageTransitionView)
+                    }
+                } else if (mediaData is VideoContentRenderer.Data) {
+                    // will be shown at end of transition
+                    pager2.isInvisible = true
+                    supportPostponeEnterTransition()
+                    imageContentRenderer.renderThumbnailDontTransform(mediaData.thumbnailMediaData, imageTransitionView) {
+                        // Proceed with transaction
+                        scheduleStartPostponedTransition(imageTransitionView)
+                    }
+                }
+            }
+        }
+
+        val session = sessionHolder.getSafeActiveSession() ?: return Unit.also { finish() }
+
+        val room = args.roomId?.let { session.getRoom(it) }
+
+        val inMemoryData = intent.getParcelableArrayListExtra<AttachmentData>(EXTRA_IN_MEMORY_DATA)
+        if (inMemoryData != null) {
+            val sourceProvider = dataSourceFactory.createProvider(inMemoryData, room, initialIndex)
+            val index = inMemoryData.indexOfFirst { it.eventId == args.eventId }
+            initialIndex = index
+            sourceProvider.interactionListener = this
+            setSourceProvider(sourceProvider)
+            this.currentSourceProvider = sourceProvider
+            if (savedInstanceState == null) {
+                pager2.setCurrentItem(index, false)
+                // The page change listener is not notified of the change...
+                pager2.post {
+                    onSelectedPositionChanged(index)
+                }
+            }
+        } else {
+            val events = room?.getAttachmentMessages()
+                    ?: emptyList()
+            val index = events.indexOfFirst { it.eventId == args.eventId }
+            initialIndex = index
+
+            val sourceProvider = dataSourceFactory.createProvider(events, index)
+            sourceProvider.interactionListener = this
+            setSourceProvider(sourceProvider)
+            this.currentSourceProvider = sourceProvider
+            if (savedInstanceState == null) {
+                pager2.setCurrentItem(index, false)
+                // The page change listener is not notified of the change...
+                pager2.post {
+                    onSelectedPositionChanged(index)
+                }
+            }
+        }
+
+        window.statusBarColor = ContextCompat.getColor(this, R.color.black_alpha)
+        window.navigationBarColor = ContextCompat.getColor(this, R.color.black_alpha)
+    }
+
+    private fun getOtherThemes() = ActivityOtherThemes.VectorAttachmentsPreview
+
+    override fun shouldAnimateDismiss(): Boolean {
+        return currentPosition != initialIndex
+    }
+
+    override fun onBackPressed() {
+        if (currentPosition == initialIndex) {
+            // show back the transition view
+            // TODO, we should track and update the mapping
+            transitionImageContainer.isVisible = true
+        }
+        isAnimatingOut = true
+        super.onBackPressed()
+    }
+
+    override fun animateClose() {
+        if (currentPosition == initialIndex) {
+            // show back the transition view
+            // TODO, we should track and update the mapping
+            transitionImageContainer.isVisible = true
+        }
+        isAnimatingOut = true
+        ActivityCompat.finishAfterTransition(this)
+    }
+
+    // ==========================================================================================
+    // PRIVATE METHODS
+    // ==========================================================================================
+
+    /**
+     * Try and add a [Transition.TransitionListener] to the entering shared element
+     * [Transition]. We do this so that we can load the full-size image after the transition
+     * has completed.
+     *
+     * @return true if we were successful in adding a listener to the enter transition
+     */
+    private fun addTransitionListener(): Boolean {
+        val transition = window.sharedElementEnterTransition
+
+        if (transition != null) {
+            // There is an entering shared element transition so add a listener to it
+            transition.addListener(
+                    onEnd = {
+                        // The listener is also called when we are exiting
+                        // so we use a boolean to avoid reshowing pager at end of dismiss transition
+                        if (!isAnimatingOut) {
+                            transitionImageContainer.isVisible = false
+                            pager2.isInvisible = false
+                        }
+                    },
+                    onCancel = {
+                        if (!isAnimatingOut) {
+                            transitionImageContainer.isVisible = false
+                            pager2.isInvisible = false
+                        }
+                    }
+            )
+            return true
+        }
+
+        // If we reach here then we have not added a listener
+        return false
+    }
+
+    private fun args() = intent.getParcelableExtra<Args>(EXTRA_ARGS)
+
+    private fun getVectorComponent(): VectorComponent {
+        return (application as HasVectorInjector).injector()
+    }
+
+    private fun scheduleStartPostponedTransition(sharedElement: View) {
+        sharedElement.viewTreeObserver.addOnPreDrawListener(
+                object : ViewTreeObserver.OnPreDrawListener {
+                    override fun onPreDraw(): Boolean {
+                        sharedElement.viewTreeObserver.removeOnPreDrawListener(this)
+                        supportStartPostponedEnterTransition()
+                        return true
+                    }
+                })
+    }
+
+    companion object {
+        const val EXTRA_ARGS = "EXTRA_ARGS"
+        const val EXTRA_IMAGE_DATA = "EXTRA_IMAGE_DATA"
+        const val EXTRA_IN_MEMORY_DATA = "EXTRA_IN_MEMORY_DATA"
+
+        fun newIntent(context: Context,
+                      mediaData: AttachmentData,
+                      roomId: String?,
+                      eventId: String,
+                      inMemoryData: List<AttachmentData>,
+                      sharedTransitionName: String?) = Intent(context, VectorAttachmentViewerActivity::class.java).also {
+            it.putExtra(EXTRA_ARGS, Args(roomId, eventId, sharedTransitionName))
+            it.putExtra(EXTRA_IMAGE_DATA, mediaData)
+            if (inMemoryData.isNotEmpty()) {
+                it.putParcelableArrayListExtra(EXTRA_IN_MEMORY_DATA, ArrayList(inMemoryData))
+            }
+        }
+    }
+
+    override fun onDismissTapped() {
+        animateClose()
+    }
+
+    override fun onPlayPause(play: Boolean) {
+        handle(if (play) AttachmentCommands.StartVideo else AttachmentCommands.PauseVideo)
+    }
+
+    override fun videoSeekTo(percent: Int) {
+        handle(AttachmentCommands.SeekTo(percent))
+    }
+
+    override fun onShareTapped() {
+        this.currentSourceProvider?.getFileForSharing(currentPosition) { data ->
+            if (data != null && lifecycle.currentState.isAtLeast(Lifecycle.State.RESUMED)) {
+                shareMedia(this@VectorAttachmentViewerActivity, data, getMimeTypeFromUri(this@VectorAttachmentViewerActivity, data.toUri()))
+            }
+        }
+    }
+}

vector/src/main/java/im/vector/riotx/features/media/VideoContentRenderer.kt

@@ -16,7 +16,6 @@
 
 package im.vector.riotx.features.media
 
-import android.os.Parcelable
 import android.widget.ImageView
 import android.widget.ProgressBar
 import android.widget.TextView
@@ -38,13 +37,13 @@ class VideoContentRenderer @Inject constructor(private val activeSessionHolder:
 
     @Parcelize
     data class Data(
-            val eventId: String,
-            val filename: String,
-            val mimeType: String?,
-            val url: String?,
-            val elementToDecrypt: ElementToDecrypt?,
+            override val eventId: String,
+            override val filename: String,
+            override val mimeType: String?,
+            override val url: String?,
+            override val elementToDecrypt: ElementToDecrypt?,
             val thumbnailMediaData: ImageContentRenderer.Data
-    ) : Parcelable
+    ) : AttachmentData
 
     fun render(data: Data,
                thumbnailView: ImageView,

vector/src/main/java/im/vector/riotx/features/navigation/DefaultNavigator.kt

@@ -19,7 +19,6 @@ package im.vector.riotx.features.navigation
 import android.app.Activity
 import android.content.Context
 import android.content.Intent
-import android.os.Build
 import android.view.View
 import android.view.Window
 import androidx.core.app.ActivityOptionsCompat
@@ -49,11 +48,9 @@ import im.vector.riotx.features.home.room.detail.RoomDetailArgs
 import im.vector.riotx.features.home.room.detail.widget.WidgetRequestCodes
 import im.vector.riotx.features.home.room.filtered.FilteredRoomsActivity
 import im.vector.riotx.features.invite.InviteUsersToRoomActivity
+import im.vector.riotx.features.media.AttachmentData
 import im.vector.riotx.features.media.BigImageViewerActivity
-import im.vector.riotx.features.media.ImageContentRenderer
-import im.vector.riotx.features.media.ImageMediaViewerActivity
-import im.vector.riotx.features.media.VideoContentRenderer
-import im.vector.riotx.features.media.VideoMediaViewerActivity
+import im.vector.riotx.features.media.VectorAttachmentViewerActivity
 import im.vector.riotx.features.roomdirectory.RoomDirectoryActivity
 import im.vector.riotx.features.roomdirectory.createroom.CreateRoomActivity
 import im.vector.riotx.features.roomdirectory.roompreview.RoomPreviewActivity
@@ -89,7 +86,8 @@ class DefaultNavigator @Inject constructor(
 
     override fun performDeviceVerification(context: Context, otherUserId: String, sasTransactionId: String) {
         val session = sessionHolder.getSafeActiveSession() ?: return
-        val tx = session.cryptoService().verificationService().getExistingTransaction(otherUserId, sasTransactionId) ?: return
+        val tx = session.cryptoService().verificationService().getExistingTransaction(otherUserId, sasTransactionId)
+                ?: return
         (tx as? IncomingSasVerificationTransaction)?.performAccept()
         if (context is VectorBaseActivity) {
             VerificationBottomSheet.withArgs(
@@ -237,7 +235,8 @@ class DefaultNavigator @Inject constructor(
                 ?.let { avatarUrl ->
                     val intent = BigImageViewerActivity.newIntent(activity, matrixItem.getBestName(), avatarUrl)
                     val options = sharedElement?.let {
-                        ActivityOptionsCompat.makeSceneTransitionAnimation(activity, it, ViewCompat.getTransitionName(it) ?: "")
+                        ActivityOptionsCompat.makeSceneTransitionAnimation(activity, it, ViewCompat.getTransitionName(it)
+                                ?: "")
                     }
                     activity.startActivity(intent, options?.toBundle())
                 }
@@ -265,27 +264,32 @@ class DefaultNavigator @Inject constructor(
         context.startActivity(WidgetActivity.newIntent(context, widgetArgs))
     }
 
-    override fun openImageViewer(activity: Activity, mediaData: ImageContentRenderer.Data, view: View, options: ((MutableList<Pair<View, String>>) -> Unit)?) {
-        val intent = ImageMediaViewerActivity.newIntent(activity, mediaData, ViewCompat.getTransitionName(view))
+    override fun openMediaViewer(activity: Activity,
+                                 roomId: String,
+                                 mediaData: AttachmentData,
+                                 view: View,
+                                 inMemory: List<AttachmentData>,
+                                 options: ((MutableList<Pair<View, String>>) -> Unit)?) {
+        VectorAttachmentViewerActivity.newIntent(activity,
+                mediaData,
+                roomId,
+                mediaData.eventId,
+                inMemory,
+                ViewCompat.getTransitionName(view)).let { intent ->
             val pairs = ArrayList<Pair<View, String>>()
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
             activity.window.decorView.findViewById<View>(android.R.id.statusBarBackground)?.let {
                 pairs.add(Pair(it, Window.STATUS_BAR_BACKGROUND_TRANSITION_NAME))
             }
             activity.window.decorView.findViewById<View>(android.R.id.navigationBarBackground)?.let {
                 pairs.add(Pair(it, Window.NAVIGATION_BAR_BACKGROUND_TRANSITION_NAME))
             }
-        }
+
             pairs.add(Pair(view, ViewCompat.getTransitionName(view) ?: ""))
             options?.invoke(pairs)
 
             val bundle = ActivityOptionsCompat.makeSceneTransitionAnimation(activity, *pairs.toTypedArray()).toBundle()
             activity.startActivity(intent, bundle)
         }
-
-    override fun openVideoViewer(activity: Activity, mediaData: VideoContentRenderer.Data) {
-        val intent = VideoMediaViewerActivity.newIntent(activity, mediaData)
-        activity.startActivity(intent)
     }
 
     private fun startActivity(context: Context, intent: Intent, buildTask: Boolean) {

vector/src/main/java/im/vector/riotx/features/navigation/Navigator.kt

@@ -23,11 +23,10 @@ import androidx.core.util.Pair
 import androidx.fragment.app.Fragment
 import im.vector.matrix.android.api.session.room.model.roomdirectory.PublicRoom
 import im.vector.matrix.android.api.session.terms.TermsService
-import im.vector.matrix.android.api.util.MatrixItem
 import im.vector.matrix.android.api.session.widgets.model.Widget
+import im.vector.matrix.android.api.util.MatrixItem
 import im.vector.riotx.features.home.room.detail.widget.WidgetRequestCodes
-import im.vector.riotx.features.media.ImageContentRenderer
-import im.vector.riotx.features.media.VideoContentRenderer
+import im.vector.riotx.features.media.AttachmentData
 import im.vector.riotx.features.settings.VectorSettingsActivity
 import im.vector.riotx.features.share.SharedData
 import im.vector.riotx.features.terms.ReviewTermsActivity
@@ -93,7 +92,10 @@ interface Navigator {
 
     fun openRoomWidget(context: Context, roomId: String, widget: Widget)
 
-    fun openImageViewer(activity: Activity, mediaData: ImageContentRenderer.Data, view: View, options: ((MutableList<Pair<View, String>>) -> Unit)?)
-
-    fun openVideoViewer(activity: Activity, mediaData: VideoContentRenderer.Data)
+    fun openMediaViewer(activity: Activity,
+                        roomId: String,
+                        mediaData: AttachmentData,
+                        view: View,
+                        inMemory: List<AttachmentData> = emptyList(),
+                        options: ((MutableList<Pair<View, String>>) -> Unit)?)
 }

vector/src/main/java/im/vector/riotx/features/popup/PopupAlertManager.kt

@@ -26,6 +26,7 @@ import com.tapadoo.alerter.Alerter
 import com.tapadoo.alerter.OnHideAlertListener
 import dagger.Lazy
 import im.vector.riotx.R
+import im.vector.riotx.core.platform.VectorBaseActivity
 import im.vector.riotx.features.home.AvatarRenderer
 import im.vector.riotx.features.themes.ThemeUtils
 import timber.log.Timber
@@ -83,7 +84,7 @@ class PopupAlertManager @Inject constructor(private val avatarRenderer: Lazy<Ava
                 setLightStatusBar()
             }
         }
-        if (currentAlerter?.shouldBeDisplayedIn?.invoke(activity) == false) {
+        if (currentAlerter?.shouldBeDisplayedIn?.invoke(activity) == false || activity !is VectorBaseActivity) {
             return
         }
 

vector/src/main/java/im/vector/riotx/features/roomprofile/uploads/media/RoomUploadsMediaFragment.kt

@@ -20,23 +20,34 @@ import android.os.Bundle
 import android.util.DisplayMetrics
 import android.view.View
 import androidx.core.content.ContextCompat
+import androidx.core.util.Pair
+import androidx.core.view.ViewCompat
 import androidx.recyclerview.widget.GridLayoutManager
 import com.airbnb.mvrx.Fail
 import com.airbnb.mvrx.Loading
 import com.airbnb.mvrx.Success
 import com.airbnb.mvrx.parentFragmentViewModel
 import com.airbnb.mvrx.withState
+import com.google.android.material.appbar.AppBarLayout
+import im.vector.matrix.android.api.session.room.model.message.MessageImageContent
+import im.vector.matrix.android.api.session.room.model.message.MessageVideoContent
+import im.vector.matrix.android.api.session.room.model.message.getFileUrl
+import im.vector.matrix.android.internal.crypto.attachments.toElementToDecrypt
 import im.vector.riotx.R
 import im.vector.riotx.core.extensions.cleanup
 import im.vector.riotx.core.extensions.trackItemsVisibilityChange
 import im.vector.riotx.core.platform.StateView
 import im.vector.riotx.core.platform.VectorBaseFragment
 import im.vector.riotx.core.utils.DimensionConverter
+import im.vector.riotx.features.media.AttachmentData
 import im.vector.riotx.features.media.ImageContentRenderer
 import im.vector.riotx.features.media.VideoContentRenderer
 import im.vector.riotx.features.roomprofile.uploads.RoomUploadsAction
+import im.vector.riotx.features.roomprofile.uploads.RoomUploadsFragment
 import im.vector.riotx.features.roomprofile.uploads.RoomUploadsViewModel
+import im.vector.riotx.features.roomprofile.uploads.RoomUploadsViewState
 import kotlinx.android.synthetic.main.fragment_generic_state_view_recycler.*
+import kotlinx.android.synthetic.main.fragment_room_uploads.*
 import javax.inject.Inject
 
 class RoomUploadsMediaFragment @Inject constructor(
@@ -76,12 +87,86 @@ class RoomUploadsMediaFragment @Inject constructor(
         controller.listener = null
     }
 
-    override fun onOpenImageClicked(view: View, mediaData: ImageContentRenderer.Data) {
-        navigator.openImageViewer(requireActivity(), mediaData, view, null)
+    // It's very strange i can't just access
+    // the app bar using find by id...
+    private fun trickFindAppBar(): AppBarLayout? {
+        return activity?.supportFragmentManager?.fragments
+                ?.filterIsInstance<RoomUploadsFragment>()
+                ?.firstOrNull()
+                ?.roomUploadsAppBar
     }
 
-    override fun onOpenVideoClicked(view: View, mediaData: VideoContentRenderer.Data) {
-        navigator.openVideoViewer(requireActivity(), mediaData)
+    override fun onOpenImageClicked(view: View, mediaData: ImageContentRenderer.Data) = withState(uploadsViewModel) { state ->
+        val inMemory = getItemsArgs(state)
+        navigator.openMediaViewer(
+                activity = requireActivity(),
+                roomId = state.roomId,
+                mediaData = mediaData,
+                view = view,
+                inMemory = inMemory
+        ) { pairs ->
+            trickFindAppBar()?.let {
+                pairs.add(Pair(it, ViewCompat.getTransitionName(it) ?: ""))
+            }
+        }
+    }
+
+    private fun getItemsArgs(state: RoomUploadsViewState): List<AttachmentData> {
+        return state.mediaEvents.mapNotNull {
+            when (val content = it.contentWithAttachmentContent) {
+                is MessageImageContent -> {
+                    ImageContentRenderer.Data(
+                            eventId = it.eventId,
+                            filename = content.body,
+                            mimeType = content.mimeType,
+                            url = content.getFileUrl(),
+                            elementToDecrypt = content.encryptedFileInfo?.toElementToDecrypt(),
+                            maxHeight = -1,
+                            maxWidth = -1,
+                            width = null,
+                            height = null
+                    )
+                }
+                is MessageVideoContent -> {
+                    val thumbnailData = ImageContentRenderer.Data(
+                            eventId = it.eventId,
+                            filename = content.body,
+                            mimeType = content.mimeType,
+                            url = content.videoInfo?.thumbnailFile?.url
+                                    ?: content.videoInfo?.thumbnailUrl,
+                            elementToDecrypt = content.videoInfo?.thumbnailFile?.toElementToDecrypt(),
+                            height = content.videoInfo?.height,
+                            maxHeight = -1,
+                            width = content.videoInfo?.width,
+                            maxWidth = -1
+                    )
+                    VideoContentRenderer.Data(
+                            eventId = it.eventId,
+                            filename = content.body,
+                            mimeType = content.mimeType,
+                            url = content.getFileUrl(),
+                            elementToDecrypt = content.encryptedFileInfo?.toElementToDecrypt(),
+                            thumbnailMediaData = thumbnailData
+                    )
+                }
+                else                   -> null
+            }
+        }
+    }
+
+    override fun onOpenVideoClicked(view: View, mediaData: VideoContentRenderer.Data) = withState(uploadsViewModel) { state ->
+        val inMemory = getItemsArgs(state)
+        navigator.openMediaViewer(
+                activity = requireActivity(),
+                roomId = state.roomId,
+                mediaData = mediaData,
+                view = view,
+                inMemory = inMemory
+        ) { pairs ->
+            trickFindAppBar()?.let {
+                pairs.add(Pair(it, ViewCompat.getTransitionName(it) ?: ""))
+            }
+        }
     }
 
     override fun loadMore() {

vector/src/main/java/im/vector/riotx/features/roomprofile/uploads/media/UploadsImageItem.kt

@@ -18,11 +18,13 @@ package im.vector.riotx.features.roomprofile.uploads.media
 
 import android.view.View
 import android.widget.ImageView
+import androidx.core.view.ViewCompat
 import com.airbnb.epoxy.EpoxyAttribute
 import com.airbnb.epoxy.EpoxyModelClass
 import im.vector.riotx.R
 import im.vector.riotx.core.epoxy.VectorEpoxyHolder
 import im.vector.riotx.core.epoxy.VectorEpoxyModel
+import im.vector.riotx.core.utils.DebouncedClickListener
 import im.vector.riotx.features.media.ImageContentRenderer
 
 @EpoxyModelClass(layout = R.layout.item_uploads_image)
@@ -35,8 +37,13 @@ abstract class UploadsImageItem : VectorEpoxyModel<UploadsImageItem.Holder>() {
 
     override fun bind(holder: Holder) {
         super.bind(holder)
-        holder.view.setOnClickListener { listener?.onItemClicked(holder.imageView, data) }
+        holder.view.setOnClickListener(
+                DebouncedClickListener(View.OnClickListener { _ ->
+                    listener?.onItemClicked(holder.imageView, data)
+                })
+        )
         imageContentRenderer.render(data, holder.imageView, IMAGE_SIZE_DP)
+        ViewCompat.setTransitionName(holder.imageView, "imagePreview_${id()}")
     }
 
     class Holder : VectorEpoxyHolder() {

vector/src/main/java/im/vector/riotx/features/roomprofile/uploads/media/UploadsVideoItem.kt

@@ -18,11 +18,13 @@ package im.vector.riotx.features.roomprofile.uploads.media
 
 import android.view.View
 import android.widget.ImageView
+import androidx.core.view.ViewCompat
 import com.airbnb.epoxy.EpoxyAttribute
 import com.airbnb.epoxy.EpoxyModelClass
 import im.vector.riotx.R
 import im.vector.riotx.core.epoxy.VectorEpoxyHolder
 import im.vector.riotx.core.epoxy.VectorEpoxyModel
+import im.vector.riotx.core.utils.DebouncedClickListener
 import im.vector.riotx.features.media.ImageContentRenderer
 import im.vector.riotx.features.media.VideoContentRenderer
 
@@ -36,8 +38,13 @@ abstract class UploadsVideoItem : VectorEpoxyModel<UploadsVideoItem.Holder>() {
 
     override fun bind(holder: Holder) {
         super.bind(holder)
-        holder.view.setOnClickListener { listener?.onItemClicked(holder.imageView, data) }
+        holder.view.setOnClickListener(
+            DebouncedClickListener(View.OnClickListener { _ ->
+                listener?.onItemClicked(holder.imageView, data)
+            })
+        )
         imageContentRenderer.render(data.thumbnailMediaData, holder.imageView, IMAGE_SIZE_DP)
+        ViewCompat.setTransitionName(holder.imageView, "videoPreview_${id()}")
     }
 
     class Holder : VectorEpoxyHolder() {

vector/src/main/java/im/vector/riotx/features/themes/ActivityOtherThemes.kt

@@ -38,4 +38,10 @@ sealed class ActivityOtherThemes(@StyleRes val dark: Int,
             R.style.AppTheme_AttachmentsPreview,
             R.style.AppTheme_AttachmentsPreview
     )
+
+    object VectorAttachmentsPreview : ActivityOtherThemes(
+            R.style.AppTheme_Transparent,
+            R.style.AppTheme_Transparent,
+            R.style.AppTheme_Transparent
+    )
 }

vector/src/main/res/drawable/ic_pause.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M6,19h4L10,5L6,5v14zM14,5v14h4L18,5h-4z"/>
+</vector>

vector/src/main/res/drawable/ic_play_arrow.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M8,5v14l11,-7z"/>
+</vector>

vector/src/main/res/layout/fragment_room_uploads.xml

@@ -8,6 +8,8 @@
 
     <com.google.android.material.appbar.AppBarLayout
         style="@style/VectorAppBarLayoutStyle"
+        android:id="@+id/roomUploadsAppBar"
+        android:transitionName="toolbar"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:elevation="4dp">

vector/src/main/res/layout/merge_image_attachment_overlay.xml

@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="utf-8"?>
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:parentTag="androidx.constraintlayout.widget.ConstraintLayout">
+
+    <View
+        android:id="@+id/overlayTopBackground"
+        android:layout_width="match_parent"
+        android:layout_height="60dp"
+        android:background="@color/black_alpha"
+        app:layout_constraintTop_toTopOf="parent">
+
+    </View>
+
+
+    <ImageView
+        android:id="@+id/overlayBackButton"
+        android:layout_width="44dp"
+        android:layout_height="44dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginEnd="16dp"
+        android:background="?attr/selectableItemBackgroundBorderless"
+        android:clickable="true"
+        android:contentDescription="@string/action_close"
+        android:focusable="true"
+        android:padding="6dp"
+        android:scaleType="centerInside"
+        android:tint="@color/white"
+        app:layout_constraintBottom_toBottomOf="@id/overlayTopBackground"
+        app:layout_constraintStart_toStartOf="@id/overlayTopBackground"
+        app:layout_constraintTop_toTopOf="@id/overlayTopBackground"
+        app:srcCompat="@drawable/ic_back_24dp" />
+
+    <TextView
+        android:id="@+id/overlayCounterText"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="8dp"
+        android:layout_marginEnd="8dp"
+        android:ellipsize="end"
+        android:maxLines="1"
+        android:textColor="@color/white"
+        android:textSize="14sp"
+        android:textStyle="bold"
+        app:layout_constraintBottom_toTopOf="@id/overlayInfoText"
+        app:layout_constraintEnd_toStartOf="@id/overlayShareButton"
+        app:layout_constraintStart_toEndOf="@id/overlayBackButton"
+        app:layout_constraintTop_toTopOf="@id/overlayTopBackground"
+        app:layout_constraintVertical_chainStyle="packed"
+        tools:text="1 of 200" />
+
+    <TextView
+        android:id="@+id/overlayInfoText"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="8dp"
+        android:ellipsize="end"
+        android:maxLines="1"
+        android:textColor="@color/white"
+        android:textSize="14sp"
+        app:layout_constraintBottom_toBottomOf="@id/overlayTopBackground"
+        app:layout_constraintEnd_toStartOf="@id/overlayShareButton"
+        app:layout_constraintStart_toStartOf="@id/overlayCounterText"
+        app:layout_constraintTop_toBottomOf="@id/overlayCounterText"
+        tools:text="Bill 29 Jun at 19:42" />
+
+    <ImageView
+        android:id="@+id/overlayShareButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="16dp"
+        android:background="?attr/selectableItemBackgroundBorderless"
+        android:clickable="true"
+        android:contentDescription="@string/share"
+        android:focusable="true"
+        android:padding="6dp"
+        android:tint="@color/white"
+        app:layout_constraintBottom_toBottomOf="@id/overlayTopBackground"
+        app:layout_constraintEnd_toEndOf="@id/overlayTopBackground"
+        app:layout_constraintTop_toTopOf="@id/overlayTopBackground"
+        app:srcCompat="@drawable/ic_share" />
+
+
+    <androidx.constraintlayout.widget.Group
+        android:id="@+id/overlayVideoControlsGroup"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:visibility="gone"
+        app:constraint_referenced_ids="overlayBottomBackground,overlayBackButton,overlayPlayPauseButton,overlaySeekBar"
+        tools:visibility="visible" />
+
+    <View
+        android:id="@+id/overlayBottomBackground"
+        android:layout_width="match_parent"
+        android:layout_height="60dp"
+        android:background="@color/black_alpha"
+        app:layout_constraintBottom_toBottomOf="parent" />
+
+    <ImageView
+        android:id="@+id/overlayPlayPauseButton"
+        android:layout_width="44dp"
+        android:layout_height="44dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginEnd="16dp"
+        android:background="?attr/selectableItemBackgroundBorderless"
+        android:clickable="true"
+        android:contentDescription="@string/play_video"
+        android:focusable="true"
+        android:padding="6dp"
+        android:scaleType="centerInside"
+        android:tint="@color/white"
+        app:layout_constraintBottom_toBottomOf="@id/overlayBottomBackground"
+        app:layout_constraintStart_toStartOf="@id/overlayBottomBackground"
+        app:layout_constraintTop_toTopOf="@id/overlayBottomBackground"
+        app:srcCompat="@drawable/ic_play_arrow" />
+
+    <SeekBar
+        android:id="@+id/overlaySeekBar"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="8dp"
+        android:layout_marginEnd="8dp"
+        android:backgroundTint="@color/white"
+        android:progressBackgroundTint="@color/white"
+        android:thumbTint="@color/white"
+        app:layout_constraintBottom_toBottomOf="@id/overlayBottomBackground"
+        app:layout_constraintEnd_toEndOf="@id/overlayBottomBackground"
+        app:layout_constraintStart_toEndOf="@id/overlayPlayPauseButton"
+        app:layout_constraintTop_toTopOf="@id/overlayBottomBackground" />
+</merge>

vector/src/main/res/values/colors_riotx.xml

@@ -40,6 +40,7 @@
     <!-- Other usefull color -->
     <color name="black">#FF000000</color>
     <color name="white">#FFFFFFFF</color>
+    <color name="black_alpha">#55000000</color>
 
     <!-- Palette: format fo naming:
       'riotx_<name in the palette snake case>_<theme>'

vector/src/main/res/values/strings.xml

@@ -76,6 +76,10 @@
     <string name="disconnect">Disconnect</string>
     <string name="report_content">Report content</string>
     <string name="active_call">Active call</string>
+    <string name="play_video">Play</string>
+    <string name="pause_video">Pause</string>
+
+
     <!-- First param will be replace by the value of ongoing_conference_call_voice, and second one by the value of ongoing_conference_call_video -->
     <string name="ongoing_conference_call">Ongoing conference call.\nJoin as %1$s or %2$s</string>
     <string name="ongoing_conference_call_voice">Voice</string>

vector/src/main/res/values/theme_common.xml

@@ -10,4 +10,15 @@
 
     <style name="AppTheme.AttachmentsPreview" parent="AppTheme.Base.Black"/>
 
+    <style name="AppTheme.Transparent" parent="AppTheme.Base.Black">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+        <item name="android:windowIsTranslucent">true</item>
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:windowContentOverlay">@null</item>
+        <item name="android:windowNoTitle">true</item>
+        <!--        <item name="android:windowIsFloating">true</item>-->
+        <item name="android:backgroundDimEnabled">false</item>
+    </style>
+
 </resources>