feat(call): share own screen from the device

app/src/main/AndroidManifest.xml

@@ -44,6 +44,7 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_CAMERA" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MICROPHONE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PROJECTION" />
     <uses-permission android:name="android.permission.READ_CONTACTS" />
     <uses-permission android:name="android.permission.WRITE_CONTACTS" />
     <uses-permission android:name="android.permission.READ_PROFILE" />
@@ -369,7 +370,7 @@
         <service
             android:name=".services.CallForegroundService"
             android:exported="false"
-            android:foregroundServiceType="microphone|camera" />
+            android:foregroundServiceType="microphone|camera|mediaProjection" />
 
         <service android:name=".services.UnifiedPushService"
             android:exported="false">

app/src/main/java/com/nextcloud/talk/activities/CallBaseActivity.java

@@ -33,7 +33,7 @@ public abstract class CallBaseActivity extends BaseActivity {
     private final OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(true) {
         @Override
         public void handleOnBackPressed() {
-            if (isPipModePossible()) {
+            if (shouldEnterPipModeAutomatically()) {
                 enterPipMode();
             } else {
                 moveTaskToBack(true);
@@ -110,7 +110,7 @@ public void onTopResumedActivityChanged(boolean isTopResumedActivity) {
         Log.d(TAG, "onTopResumedActivityChanged: isTopResumedActivity=" + isTopResumedActivity
                 + " isInPictureInPictureMode=" + isInPictureInPictureMode());
         if (isTopResumedActivity || isInPictureInPictureMode()
-                || !isPipModePossible()
+                || !shouldEnterPipModeAutomatically()
                 || isChangingConfigurations()
                 || isFinishing()) {
             return;
@@ -129,7 +129,7 @@ public void onPause() {
         // On API 29+, onTopResumedActivityChanged already handled this.
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q
                 && !isInPictureInPictureMode()
-                && isPipModePossible()
+                && shouldEnterPipModeAutomatically()
                 && !isChangingConfigurations()
                 && !isFinishing()) {
             enterPipMode();
@@ -152,7 +152,7 @@ protected void onUserLeaveHint() {
         // moveTaskToBack here: onUserLeaveHint also fires when a transient overlay like the
         // permission dialog appears at call start, which would throw the call to the background.
         if (!isInPipMode
-                && isPipModePossible()
+                && shouldEnterPipModeAutomatically()
                 && Build.VERSION.SDK_INT < Build.VERSION_CODES.S) {
             enterPipMode();
         }
@@ -173,6 +173,35 @@ void enterPipMode() {
         }
     }
 
+    /**
+     * Whether picture in picture should not be entered when the user leaves the activity (for example, with the back
+     * or home buttons). Picture in picture can still be entered explicitly.
+     * <p>
+     * {@link #updatePipAutoEnter()} must be called whenever the returned value changes.
+     */
+    protected boolean isAutomaticPipModeSuppressed() {
+        return false;
+    }
+
+    private boolean shouldEnterPipModeAutomatically() {
+        return isPipModePossible() && !isAutomaticPipModeSuppressed();
+    }
+
+    /**
+     * Updates whether the system enters picture in picture automatically when leaving the activity.
+     */
+    void updatePipAutoEnter() {
+        // It may be called from a task posted before the activity was destroyed.
+        if (isFinishing() || isDestroyed()) {
+            return;
+        }
+        // The builder is only created if picture in picture was possible when the activity was created.
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S && mPictureInPictureParamsBuilder != null) {
+            mPictureInPictureParamsBuilder.setAutoEnterEnabled(!isAutomaticPipModeSuppressed());
+            setPictureInPictureParams(mPictureInPictureParamsBuilder.build());
+        }
+    }
+
     boolean isPipModePossible() {
             boolean deviceHasPipFeature = getPackageManager().hasSystemFeature(PackageManager.FEATURE_PICTURE_IN_PICTURE);
 

app/src/main/java/com/nextcloud/talk/activities/CallViewModel.kt

@@ -27,6 +27,12 @@ class CallViewModel @Inject constructor() : ViewModel() {
     private val _activeScreenShareSession = MutableStateFlow<ParticipantUiState?>(null)
     val activeScreenShareSession: StateFlow<ParticipantUiState?> = _activeScreenShareSession.asStateFlow()
 
+    private val _isLocalScreenSharing = MutableStateFlow(false)
+    val isLocalScreenSharing: StateFlow<Boolean> = _isLocalScreenSharing.asStateFlow()
+
+    private val _isScreenSharingAllowed = MutableStateFlow(false)
+    val isScreenSharingAllowed: StateFlow<Boolean> = _isScreenSharingAllowed.asStateFlow()
+
     fun getParticipant(sessionId: String?): ParticipantHandler? {
         if (sessionId == null) {
             Log.w(TAG, "Attempted to get participant with null sessionId.")
@@ -88,6 +94,14 @@ class CallViewModel @Inject constructor() : ViewModel() {
         }
     }
 
+    fun setLocalScreenSharing(isSharing: Boolean) {
+        _isLocalScreenSharing.value = isSharing
+    }
+
+    fun setScreenSharingAllowed(isAllowed: Boolean) {
+        _isScreenSharingAllowed.value = isAllowed
+    }
+
     public override fun onCleared() {
         participantHandlers.values.forEach { it.destroy() }
         participantHandlers.clear()