fix(android) reset audio route after audio focus was lost

Looks like audio devices must be re-set after focus was lost and regained.
Otherwise some devices (tested on a Samsung Galaxy S9) are in a weird state
where the second microphone is not used when speakerphone is on.

android/sdk/src/main/java/org/jitsi/meet/sdk/AudioDeviceHandlerGeneric.java

@@ -63,7 +63,7 @@ class AudioDeviceHandlerGeneric implements
     private AudioManager audioManager;
 
     /**
-     * {@link Runnable} for running audio device detection the main thread.
+     * {@link Runnable} for running audio device detection in the audio thread.
      * This is only used on Android >= M.
      */
     private final Runnable onAudioDeviceChangeRunner = new Runnable() {
@@ -145,7 +145,7 @@ class AudioDeviceHandlerGeneric implements
                         // Some other application potentially stole our audio focus
                         // temporarily. Restore our mode.
                         if (audioFocusLost) {
-                            module.updateAudioRoute();
+                            module.resetAudioRoute();
                         }
                         audioFocusLost = false;
                         break;

android/sdk/src/main/java/org/jitsi/meet/sdk/AudioModeModule.java

@@ -256,7 +256,7 @@ class AudioModeModule extends ReactContextBaseJavaModule {
                 if (mode != -1) {
                     JitsiMeetLogger.i(TAG + " User selected device set to: " + device);
                     userSelectedDevice = device;
-                    updateAudioRoute(mode);
+                    updateAudioRoute(mode, false);
                 }
             }
         });
@@ -282,7 +282,7 @@ class AudioModeModule extends ReactContextBaseJavaModule {
                 boolean success;
 
                 try {
-                    success = updateAudioRoute(mode);
+                    success = updateAudioRoute(mode, false);
                 } catch (Throwable e) {
                     success = false;
                     JitsiMeetLogger.e(e, TAG + " Failed to update audio route for mode: " + mode);
@@ -321,7 +321,7 @@ class AudioModeModule extends ReactContextBaseJavaModule {
      * @return {@code true} if the audio route was updated successfully;
      * {@code false}, otherwise.
      */
-    private boolean updateAudioRoute(int mode) {
+    private boolean updateAudioRoute(int mode, boolean force) {
         JitsiMeetLogger.i(TAG + " Update audio route for mode: " + mode);
 
         if (!audioDeviceHandler.setMode(mode)) {
@@ -356,7 +356,7 @@ class AudioModeModule extends ReactContextBaseJavaModule {
 
         // If the previously selected device and the current default one
         // match, do nothing.
-        if (selectedDevice != null && selectedDevice.equals(audioDevice)) {
+        if (!force && selectedDevice != null && selectedDevice.equals(audioDevice)) {
             return true;
         }
 
@@ -421,7 +421,16 @@ class AudioModeModule extends ReactContextBaseJavaModule {
      */
     void updateAudioRoute() {
         if (mode != -1) {
-            updateAudioRoute(mode);
+            updateAudioRoute(mode, false);
+        }
+    }
+
+    /**
+     * Re-sets the current audio route. Needed when focus is lost and regained.
+     */
+    void resetAudioRoute() {
+        if (mode != -1) {
+            updateAudioRoute(mode, true);
         }
     }