Invite by msisdn. Error 500 from matrix.org though (#548)

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/extensions/Strings.kt

@@ -0,0 +1,24 @@
+/*
+ * 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.matrix.android.api.extensions
+
+fun CharSequence.ensurePrefix(prefix: CharSequence): CharSequence {
+    return when {
+        startsWith(prefix) -> this
+        else               -> "$prefix$this"
+    }
+}

vector/src/main/java/im/vector/riotx/core/extensions/BasicExtensions.kt

@@ -21,6 +21,7 @@ import android.util.Patterns
 import androidx.fragment.app.Fragment
 import com.google.i18n.phonenumbers.NumberParseException
 import com.google.i18n.phonenumbers.PhoneNumberUtil
+import im.vector.matrix.android.api.extensions.ensurePrefix
 
 fun Boolean.toOnOff() = if (this) "ON" else "OFF"
 
@@ -38,11 +39,10 @@ fun CharSequence.isEmail() = Patterns.EMAIL_ADDRESS.matcher(this).matches()
 
 /**
  * Check if a CharSequence is a phone number
- * FIXME It does not work?
  */
 fun CharSequence.isMsisdn(): Boolean {
     return try {
-        PhoneNumberUtil.getInstance().parse(this, null)
+        PhoneNumberUtil.getInstance().parse(ensurePrefix("+"), null)
         true
     } catch (e: NumberParseException) {
         false