Add files via upload

AndroidManifest.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.example.ex4">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme"
+        tools:ignore="AllowBackup,GoogleAppIndexingWarning">
+        <activity android:name=".JoystickActivity" />
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+    <uses-permission android:name="android.permission.INTERNET"
+        tools:ignore="ManifestOrder" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
+</manifest>

java/com/example/ex4/Joystick.java

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+package com.example.ex4;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.View;
+
+public class Joystick extends SurfaceView implements SurfaceHolder.Callback, View.OnTouchListener {
+
+    private float centerX;
+    private float centerY;
+    private float baseRadius;
+    private float hatRadius;
+    private JoystickListener joystickCallback;
+    //CTOR
+    public Joystick(Context context, AttributeSet attrs)
+    {
+        super(context, attrs);
+        getHolder().addCallback(this);
+        setOnTouchListener(this);
+        if (context instanceof JoystickListener)
+            joystickCallback = (JoystickListener) context;
+    }
+    //CTOR
+    public Joystick(Context context, AttributeSet attrs, int defStyleAttr)
+    {
+        super(context, attrs, defStyleAttr);
+        getHolder().addCallback(this);
+        setOnTouchListener(this);
+        if (context instanceof JoystickListener)
+            joystickCallback = (JoystickListener) context;
+    }
+    //CTOR
+    public Joystick(Context context)
+    {
+        super(context);
+        getHolder().addCallback(this);
+        setOnTouchListener(this);
+        if (context instanceof JoystickListener)
+            joystickCallback = (JoystickListener) context;
+    }
+    //instantiate dimenstions for drawing the Joystick
+    private void setupDimensions()
+    {
+        centerX = getWidth() / 2;
+        centerY = getHeight() / 2;
+        baseRadius = Math.min(getWidth(), getHeight()) / 3;
+        hatRadius = Math.min(getWidth(), getHeight()) / 5;
+    }
+    //method to be called when Joystick surface is created
+    @Override
+    public void surfaceCreated(SurfaceHolder surfaceHolder)
+    {
+        setupDimensions();
+        drawJoystick(centerX, centerY);
+    }
+    //method to be called when Joystick surface is changed
+    @Override
+    public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2)
+    {
+        setupDimensions();
+        drawJoystick(centerX,centerY);
+    }
+    //method to be called when Joystick sutface is destroyed
+    @Override
+    public void surfaceDestroyed(SurfaceHolder surfaceHolder)
+    {
+        UserHandler.getInstance().disconnect();
+    }
+    /*when Joystick is touched, method will be called and will compute values to be sent as
+    * arguments to the JoystickCallBack onJoystickMoved even handler*/
+    @Override
+    public boolean onTouch(View view, MotionEvent event)
+    {
+        if (view.equals(this))
+        {
+            if (event.getAction() != MotionEvent.ACTION_UP)
+            {
+                float displacement = (float) Math.sqrt((Math.pow(event.getX() - centerX, 2)) +
+                        Math.pow(event.getY() - centerY, 2));
+                if (displacement < baseRadius)
+                {
+                    drawJoystick(event.getX(), event.getY());
+                    joystickCallback.onJoystickMoved((centerX - event.getX()) / baseRadius,
+                            (event.getY() - centerY) / baseRadius, getId());
+                }
+                else {
+                    float ratio = baseRadius / displacement;
+                    float constrainedX = centerX + (event.getX() - centerX) * ratio;
+                    float constrainedY = centerY + (event.getY() - centerY) * ratio;
+                    drawJoystick(constrainedX, constrainedY);
+                    joystickCallback.onJoystickMoved((constrainedX - centerX) / baseRadius,
+                            (centerY - constrainedY) / baseRadius, getId());
+                }
+            } else {
+                drawJoystick(centerX, centerY);
+                joystickCallback.onJoystickMoved(0, 0, getId());
+            }
+        }
+        return true;
+    }
+    //draw the Joystick
+    private void drawJoystick(float x, float y)
+    {
+        if (getHolder().getSurface().isValid())
+        {
+            Canvas drawCanvas = this.getHolder().lockCanvas();
+            Paint colors = new Paint();
+            drawCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
+            colors.setARGB(255, 50, 50, 50);
+            drawCanvas.drawCircle(centerX, centerY, baseRadius, colors);
+            colors.setARGB(255, 0, 0, 255);
+            drawCanvas.drawCircle(x, y, hatRadius, colors);
+            getHolder().unlockCanvasAndPost(drawCanvas);
+        }
+    }
+    //inteface defining the onJoystickMoved event handler
+    public interface JoystickListener
+    {
+        void onJoystickMoved(float xPercent, float yPercent, int source);
+    }
+}

java/com/example/ex4/JoystickActivity.java

@@ -0,0 +1,21 @@
+package com.example.ex4;
+
+import androidx.appcompat.app.AppCompatActivity;
+import android.os.Bundle;
+
+public class JoystickActivity extends AppCompatActivity implements Joystick.JoystickListener
+{
+    @Override
+    protected void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_joystick);
+    }
+    //method to handle OnJoystickMoved event
+    public void onJoystickMoved(float xPercent, float yPercent, int source)
+    {
+        UserHandler handler = UserHandler.getInstance();
+        handler.send_message(true, xPercent); //true is aileron
+        handler.send_message(false, yPercent); //false is elevator
+    }
+}

java/com/example/ex4/MainActivity.java

@@ -0,0 +1,30 @@
+package com.example.ex4;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+
+public class MainActivity extends AppCompatActivity implements View.OnClickListener
+{
+    @Override
+    protected void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        //assign the onClick as the one to be executed once the connect button is pressed
+        Button connect_button = findViewById(R.id.connect_button);
+        connect_button.setOnClickListener(this);
+    }
+    //onClick method of the connect button
+    public void onClick(View view)
+    {
+        EditText[] values = new EditText[]{findViewById(R.id.ip_val),findViewById(R.id.port_val)};
+        UserHandler.getInstance().connect(values[0].getText().toString(),
+                Integer.parseInt(values[1].getText().toString()));
+        startActivity(new Intent(this, JoystickActivity.class));
+    }
+}

java/com/example/ex4/UserHandler.java

@@ -0,0 +1,109 @@
+package com.example.ex4;
+
+import java.io.BufferedWriter;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.net.Socket;
+
+public class UserHandler
+{
+    private String aileron_path;
+    private String elevator_path;
+    private volatile String connection_ip;
+    private volatile int connection_port;
+    private volatile boolean stop;
+    private volatile String message;
+    private Thread message_thread;
+    //static instance to be returned by getInstance()
+    private static UserHandler instance = null;
+    //get instance of the this singleton UserHandler
+    public static UserHandler getInstance()
+    {
+        if (instance == null)
+        {
+            instance = new UserHandler();
+        }
+        return instance;
+    }
+    //CTOR
+    private UserHandler()
+    {
+        aileron_path = "/controls/flight/aileron";
+        elevator_path = "/controls/flight/elevator";
+        connection_ip = null;
+        connection_port = 0;
+        stop = false;
+        message = null;
+        message_thread = null;
+    }
+    //connect to FlightGear simulator
+    public void connect(String ip, int port)
+    {
+        connection_ip = ip;
+        connection_port = port;
+        message_thread = new Thread(new Runnable()
+        {
+            @Override
+            public void run()
+            {
+                Socket sock = null;
+                PrintWriter writer = null;
+                try
+                {
+                    sock = new Socket(InetAddress.getByName(connection_ip), connection_port);
+                    writer = new PrintWriter(new BufferedWriter((new OutputStreamWriter(sock.getOutputStream()))), true);
+                    //wait for message to send...
+                    while (!stop)
+                    {
+                        synchronized (this)
+                        {
+                            if (message != null) {
+                                writer.print(message);
+                                message = null; }
+                        }
+                    }
+                    sock.close();
+                    sock = null;
+                    writer.close();
+                    writer = null;
+                }
+                catch (Exception e)
+                {
+                    if (sock != null) { try { sock.close(); } catch (Exception ex) { ex.printStackTrace(); }}
+                    if (writer != null) { writer.close(); }
+                    e.printStackTrace();
+                    return;
+                }
+            }
+        });
+        message_thread.start();
+    }
+    //disconnect from FlightGear simulator
+    public void disconnect()
+    {
+        stop = true;
+        try
+        {
+            message_thread.join();
+        }
+        catch (Exception e)
+        {
+            e.printStackTrace();
+        }
+    }
+    //send message to FlightGear
+    public void send_message(boolean aileron, float val)
+    {
+        String aileron_or_elevator = elevator_path;
+        if (aileron)
+        {
+            aileron_or_elevator = aileron_path;
+        }
+        synchronized (this)
+        {
+            message = "set " + aileron_or_elevator + " " + Float.toString(val) + " \r\n";
+        }
+    }
+}

res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,34 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#008577"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

res/layout-land/activity_joystick.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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:context=".JoystickActivity">
+
+    <com.example.ex4.Joystick
+        android:id="@+id/joystick"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>

res/layout-land/activity_main.xml

@@ -0,0 +1,103 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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:context=".MainActivity">
+
+    <TextView
+        android:id="@+id/welcome_text_view"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginLeft="16dp"
+        android:layout_marginTop="16dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginRight="16dp"
+        android:text="@string/welcome_str"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.489"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <TextView
+        android:id="@+id/ip_str"
+        android:layout_width="38dp"
+        android:layout_height="41dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginLeft="16dp"
+        android:layout_marginTop="52dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginRight="16dp"
+        android:text="@string/ip_str"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        app:layout_constraintEnd_toStartOf="@+id/ip_val"
+        app:layout_constraintHorizontal_bias="0.754"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/welcome_text_view" />
+
+    <EditText
+        android:id="@+id/ip_val"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="48dp"
+        android:layout_marginEnd="200dp"
+        android:layout_marginRight="200dp"
+        android:ems="10"
+        android:hint="@string/ip_val_str"
+        android:importantForAutofill="no"
+        android:inputType="textPersonName"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/welcome_text_view"
+        tools:targetApi="o" />
+
+    <TextView
+        android:id="@+id/port_str"
+        android:layout_width="66dp"
+        android:layout_height="37dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginLeft="16dp"
+        android:layout_marginTop="68dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginRight="16dp"
+        android:text="@string/port_str"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        app:layout_constraintEnd_toStartOf="@+id/port_val"
+        app:layout_constraintHorizontal_bias="0.849"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/ip_str" />
+
+    <EditText
+        android:id="@+id/port_val"
+        android:layout_width="213dp"
+        android:layout_height="49dp"
+        android:layout_marginTop="56dp"
+        android:layout_marginEnd="200dp"
+        android:layout_marginRight="200dp"
+        android:ems="10"
+        android:hint="@string/port_val_str"
+        android:importantForAutofill="no"
+        android:inputType="textPersonName"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/ip_val"
+        tools:targetApi="o" />
+
+    <Button
+        android:id="@+id/connect_button"
+        android:layout_width="118dp"
+        android:layout_height="70dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginLeft="16dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginRight="16dp"
+        android:layout_marginBottom="4dp"
+        android:text="@string/connect_str"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.478"
+        app:layout_constraintStart_toStartOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

res/layout/activity_joystick.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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:context=".JoystickActivity">
+
+    <com.example.ex4.Joystick
+        android:id="@+id/joystick"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>

res/layout/activity_main.xml

@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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:context=".MainActivity">
+
+    <TextView
+        android:id="@+id/welcome_text_view"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginLeft="16dp"
+        android:layout_marginTop="140dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginRight="16dp"
+        android:text="@string/welcome_str"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <TextView
+        android:id="@+id/ip_str"
+        android:layout_width="38dp"
+        android:layout_height="41dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginLeft="16dp"
+        android:layout_marginTop="52dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginRight="16dp"
+        android:text="@string/ip_str"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        app:layout_constraintEnd_toStartOf="@+id/ip_val"
+        app:layout_constraintHorizontal_bias="0.386"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/welcome_text_view" />
+
+    <EditText
+        android:id="@+id/ip_val"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="52dp"
+        android:layout_marginEnd="40dp"
+        android:layout_marginRight="40dp"
+        android:ems="10"
+        android:hint="@string/ip_val_str"
+        android:importantForAutofill="no"
+        android:inputType="textPersonName"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/welcome_text_view"
+        tools:targetApi="o" />
+
+    <TextView
+        android:id="@+id/port_str"
+        android:layout_width="66dp"
+        android:layout_height="37dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginLeft="16dp"
+        android:layout_marginTop="48dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginRight="16dp"
+        android:text="@string/port_str"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        app:layout_constraintEnd_toStartOf="@+id/port_val"
+        app:layout_constraintHorizontal_bias="0.45"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/ip_str" />
+
+    <EditText
+        android:id="@+id/port_val"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="39dp"
+        android:layout_marginEnd="40dp"
+        android:layout_marginRight="40dp"
+        android:ems="10"
+        android:hint="@string/port_val_str"
+        android:inputType="textPersonName"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/ip_val"
+        android:importantForAutofill="no" tools:targetApi="o" />
+
+    <Button
+        android:id="@+id/connect_button"
+        android:layout_width="118dp"
+        android:layout_height="70dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginLeft="16dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginRight="16dp"
+        android:layout_marginBottom="132dp"
+        android:text="@string/connect_str"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.487"
+        app:layout_constraintStart_toStartOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#008577</color>
+    <color name="colorPrimaryDark">#00574B</color>
+    <color name="colorAccent">#D81B60</color>
+</resources>

res/values/dimens.xml

@@ -0,0 +1,3 @@
+<resources>
+    <dimen name="fab_margin">16dp</dimen>
+</resources>

res/values/strings.xml

@@ -0,0 +1,10 @@
+<resources>
+    <string name="app_name">Ex4</string>
+    <string name="welcome_str">Welcome To FlightInterp Android</string>
+    <string name="ip_str">IP:</string>
+    <string name="port_str">Port:</string>
+    <string name="ip_val_str">Enter IP here</string>
+    <string name="port_val_str">Enter port here</string>
+    <string name="connect_str">Connect</string>
+    <string name="title_activity_joystick">JoystickActivity</string>
+</resources>

res/values/styles.xml

@@ -0,0 +1,20 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+    <style name="AppTheme.NoActionBar">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+    </style>
+
+    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
+
+    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
+
+</resources>