[SOLVED] Catching android media button events


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Issue

I have an app that launches a foreground service to play some media and I want to be able to control it with media buttons on smart watches/headphones and control it from a mediastyle notification etc.

I cannot get the media buttons to work consistently though. In the logs I can see they are often sent to other apps even though I started my MediaSession and playback last.

But I cannot get it to work despite having a media session where I setActive(true) and having the media callback defined?

Manifest:

<service
    android:name=".services.MediaControllerService"
    android:enabled="true"
    android:exported="true"
    android:permission="android.permission.FOREGROUND_SERVICE">
    <intent-filter android:priority="999">
        <action android:name="android.intent.action.MEDIA_BUTTON"/>
    </intent-filter>
</service>

Code (Note the packages, it was hard in android 10 finding the correct combination of packages that worked together and gave me MediaStyle)…

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.AudioAttributes;
import android.media.AudioFocusRequest;
import android.media.AudioManager;
import android.media.MediaMetadata;
import android.support.v4.media.MediaMetadataCompat;
import android.support.v4.media.session.MediaControllerCompat;
import android.support.v4.media.session.MediaSessionCompat;
import android.support.v4.media.session.PlaybackStateCompat;
import android.view.KeyEvent;
import androidx.annotation.Nullable;
import androidx.core.app.NotificationCompat;
import androidx.media.session.MediaButtonReceiver;

public class TextToSpeechMediaControllerService extends Service { 
    public static final String START_SERVICE_ACTION_INTENT = "serviceStart";
    private TextToSpeechPlayer player;
    private MediaMetadataCompat mediaMetaData;
    private MediaSessionCompat mediaSession;
    private TextToSpeechMediaControllerService.AudioFocusHelper mAudioFocusHelper;
    private AudioManager mAudioManager;
    private final String NOTIFICATION_CHANNEL_TEXT_TO_SPEECH_CONTROLS = "fp_tts_media_controls";
    public MediaControllerCompat.TransportControls transportControls;
    private String pageTitle;
    private String pageAddress;
    private String pageDomain;
    private SpeechBank currentSpeechBank;
    private MediaButtonReceiver mediaButtonReceiver;
    private AudioFocusRequest audioFocusRequest;
    private AudioAttributes playbackAttributes;
    private Handler handler;

    public TextToSpeechMediaControllerService() {
    }

    @Override
    public void onCreate() {
        Log.d("TTSMEDIAPLAYER", "---------- STARTING SERVICE ----------");
        player = new TextToSpeechPlayer(this);
        mAudioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
        mAudioFocusHelper = new TextToSpeechMediaControllerService.AudioFocusHelper();

        mediaSession = new MediaSessionCompat(this, "fpt2s");
        mediaSession.setCallback(callback);
        mediaSession.setActive(true);
        handler = new Handler(); // something to do with handling delayed focus https://developer.android.com/guide/topics/media-apps/audio-focus#audio-focus-change
        transportControls = mediaSession.getController().getTransportControls();
        NotificationChannel channel = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            channel = new NotificationChannel(NOTIFICATION_CHANNEL_TEXT_TO_SPEECH_CONTROLS,
                    getString(R.string.media_controls_notification_channel_title),
                    NotificationManager.IMPORTANCE_HIGH);
            ((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE)).createNotificationChannel(channel);
        }
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d("TTSMEDIAPLAYER", "---------- onStartCOmmand ("+intent.getAction()+", startId) ----------");
        MediaButtonReceiver.handleIntent(mediaSession, intent); // Required to catch media button events and send them to mediasession callback
        if (intent !=null && intent.getExtras()!=null){
            int closeCommand = intent.getExtras().getInt("swipeToClose", 0);
            if(closeCommand==1){
                Log.d("TTSMEDIAPLAYER", "Close service intent received.");
                // Pre-lollipop media style close button. Unable to test
                stopSelf();
                return super.onStartCommand(intent, flags, startId);
            }
            //Request audio focus
            if (false ) { // mAudioFocusHelper.requestAudioFocus() == false not needed because we request focus onPlay
                Log.d("TTSMEDIAPLAYER", "Starting and requesting focus...");
                //Could not gain focus
                stopSelf();
            }else {
                Log.d("TTSMEDIAPLAYER", "Focued. Starting...");
                boolean isPlaying = player.isPlaying();
                String nodesAsJsonString = intent.getExtras().getString("nodesAsJsonString", "[]");
                if (nodesAsJsonString != null && !nodesAsJsonString.equals("[]")) {
                    isPlaying = true;
                    // New TTS playback has been requested
                    pageTitle = intent.getExtras().getString("pageTitle", "");
                    pageAddress = intent.getExtras().getString("pageAddress", "");
                    pageDomain = UrlHelper.getDomain(pageAddress, true, true, true);
                    final Locale languageToSpeak = UrlHelper.getLanguageFromAddress(pageAddress);

                    try {
                        currentSpeechBank = new SpeechBank(nodesAsJsonString, languageToSpeak);
                    } catch (JSONException e) {
                        stopSelf();
                        return super.onStartCommand(intent, flags, startId);
                    }
                    mediaMetaData = new MediaMetadataCompat.Builder()
                            // TODO i guessed at these, I think this might be used on things like bluetooth speakers that have a display
                            .putString(MediaMetadata.METADATA_KEY_ARTIST, pageAddress)
                            .putString(MediaMetadata.METADATA_KEY_TITLE, pageTitle)
                            .putString(MediaMetadata.METADATA_KEY_DISPLAY_TITLE, pageTitle)
                            .build();
                    mediaSession.setMetadata(mediaMetaData);
                }
                Log.d("TTSMEDIAPLAYER", "isPlaying: " + isPlaying);
                /*mediaSession.setFlags(
                        MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS | // apparently no longer needed
                                //MediaSession.FLAG_HANDLES_QUEUE_COMMANDS | //
                                MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS 
                );*/

                if(intent.getAction()!=null && intent.getAction().equals(START_SERVICE_ACTION_INTENT)) {
                    Log.d("TTSMEDIAPLAYER", "START_SERVICE_ACTION_INTENT detected, triggering transportcontrols.play");
                    transportControls.play();
                }
            }
        }
        return super.onStartCommand(intent, flags, startId); //  START_NOT_STICKY;?
    }

    private void updateNotificationAndMediaButtons(boolean isPlaying) {
        // ... notification stuff ...
        startForeground(1, notificationBuilder.build());
    }

    @Override
    public void onDestroy() {
        mediaSession.release();
        mAudioFocusHelper.abandonAudioFocus();
        player.freeUpResources();
        super.onDestroy();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    private MediaSessionCompat.Callback callback = new MediaSessionCompat.Callback() {

        @Override
        public void onSkipToNext() {
            Log.d("TTSMEDIAPLAYER", "SKIP TO NEXT");
            super.onSkipToNext();
            handleFastForward();
        }

        @Override
        public void onPlay() {
            Log.d("TTSMEDIAPLAYER", "onPLAY!");
            if(mAudioFocusHelper.requestAudioFocus()) {
                if(player.isPaused()){
                    Log.d("TTSMEDIAPLAYER", "(resuming)");
                    player.resume();
                }else{
                    Log.d("TTSMEDIAPLAYER", "(not started? playNew)");
                    player.playNew(currentSpeechBank);
                }
                // TODO TTS textToSpeechPlayer.play();
                PlaybackStateCompat state = new PlaybackStateCompat.Builder()
                        // Supported actions in current state
                        .setActions(
                                PlaybackStateCompat.ACTION_PLAY | PlaybackStateCompat.ACTION_STOP
                                        | PlaybackStateCompat.ACTION_FAST_FORWARD | PlaybackStateCompat.ACTION_REWIND
                        )
                        // Current state
                        .setState(PlaybackStateCompat.STATE_PLAYING, player.getCurrentPosition(), 1, SystemClock.elapsedRealtime())
                        .build();
                mediaSession.setPlaybackState(state);
                updateNotificationAndMediaButtons(true);
            }
            super.onPlay();
        }

        @Override
        public void onPause() {
            Log.d("TTSMEDIAPLAYER", "onPAUSE!");
            player.pause();
            PlaybackStateCompat state = new PlaybackStateCompat.Builder()
                    // Set supported actions in current state
                    .setActions(
                            PlaybackStateCompat.ACTION_PLAY | PlaybackStateCompat.ACTION_STOP |
                                    PlaybackStateCompat.ACTION_FAST_FORWARD | PlaybackStateCompat.ACTION_REWIND)
                    // Set current state
                    .setState(PlaybackStateCompat.STATE_PAUSED, player.getCurrentPosition(), 1, SystemClock.elapsedRealtime())
                    .build();
            mediaSession.setPlaybackState(state);
            updateNotificationAndMediaButtons(false);
            super.onPause();
        }

        @Override
        public void onSkipToPrevious() {
            Log.d("TTSMEDIAPLAYER", "SKIP TRACK PREV!");
            player.rewind();
            super.onSkipToPrevious();
        }

        @Override
        public void onFastForward() {
            Log.d("TTSMEDIAPLAYER", "FAST FORWARD!");
            super.onFastForward();
            handleFastForward();
        }

        @Override
        public void onRewind() {
            Log.d("TTSMEDIAPLAYER", "REWIND!");
            player.rewind();
            PlaybackStateCompat state = new PlaybackStateCompat.Builder()
                    // Set supported actions in current state
                    .setActions(
                            PlaybackStateCompat.ACTION_PLAY | PlaybackStateCompat.ACTION_STOP |
                                    PlaybackStateCompat.ACTION_FAST_FORWARD | PlaybackStateCompat.ACTION_REWIND)
                    // Set current state
                    .setState(PlaybackStateCompat.STATE_PLAYING, player.getCurrentPosition(), 1, SystemClock.elapsedRealtime())
                    .build();
            mediaSession.setPlaybackState(state);
            updateNotificationAndMediaButtons(true);
            super.onRewind();
        }

        @Override
        public void onStop() {
            Log.d("TTSMEDIAPLAYER", "STOP!");
            player.stop();
            PlaybackStateCompat state = new PlaybackStateCompat.Builder()
                    // Set supported actions in current state
                    //    .setActions(null)
                    // Set current state
                    .setState(PlaybackStateCompat.STATE_STOPPED, player.getCurrentPosition(), 1, SystemClock.elapsedRealtime())
                    .build();
            mediaSession.setPlaybackState(state);
            mAudioFocusHelper.abandonAudioFocus();
            stopSelf();
            //super.onStop();
        }
    };

    private void handleFastForward() {
        boolean hasReachedEnd = player.fastForward();
        if(hasReachedEnd){
            transportControls.stop();
        }else{
            PlaybackStateCompat state = new PlaybackStateCompat.Builder()
                    // Set supported actions in current state
                    .setActions(
                            PlaybackStateCompat.ACTION_PAUSE | PlaybackStateCompat.ACTION_STOP |
                                    PlaybackStateCompat.ACTION_FAST_FORWARD | PlaybackStateCompat.ACTION_REWIND)
                    // Set current state
                    .setState(PlaybackStateCompat.STATE_PLAYING, player.getCurrentPosition(), 1, SystemClock.elapsedRealtime())
                    .build();
            mediaSession.setPlaybackState(state);
            updateNotificationAndMediaButtons(true);
        }
    }

    /**
     * Helper class for managing audio focus related tasks.
     */
    private final class AudioFocusHelper
            implements AudioManager.OnAudioFocusChangeListener {

        private boolean mPlayOnAudioFocus = false;

        private boolean requestAudioFocus() {
            Log.d("TTSMEDIAPLAYER", "requestAudioFocus()...");
            playbackAttributes = new AudioAttributes.Builder()
                    .setUsage(AudioAttributes.USAGE_MEDIA)
                    .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
                    .build();

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                audioFocusRequest = new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
                        .setAudioAttributes(playbackAttributes)
                        .setAcceptsDelayedFocusGain(false)
                        .setOnAudioFocusChangeListener(mAudioFocusHelper, handler)
                        .build();
                int res = mAudioManager.requestAudioFocus(audioFocusRequest);
                if (res == AudioManager.AUDIOFOCUS_REQUEST_FAILED) {
                    Log.d("TTSMEDIAPLAYER", "audio focus failed...");
                    return false;
                } else if (res == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
                    Log.d("TTSMEDIAPLAYER", "audio focus granted...");
                    return true;
                } else if (res == AudioManager.AUDIOFOCUS_REQUEST_DELAYED) {
                    Log.d("TTSMEDIAPLAYER", "audio focus DELAYED...");
                    // use case for this is imagine being in a phone call that has focus,
                    // then the user opens a game. The game
                    // should start playing audio once the call finishes.
                    return false; // todo?
                }
            }else{
                final int result = mAudioManager.requestAudioFocus(this,
                        AudioManager.STREAM_MUSIC,
                        AudioManager.AUDIOFOCUS_GAIN);
                return result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED;
            }
            Log.d("TTSMEDIAPLAYER", "audio focus returning default!?");
            return false;
        }

        private void abandonAudioFocus() {
            Log.d("TTSMEDIAPLAYER", "abandonAudioFocus()");
            mAudioManager.abandonAudioFocus(this);
        }

        @Override
        public void onAudioFocusChange(int focusChange) {
            Log.d("TTSMEDIAPLAYER", "Audio focus changed...");
            switch (focusChange) {
                case AudioManager.AUDIOFOCUS_GAIN:

                    Log.d("TTSMEDIAPLAYER", "Audio focus gained!");
                    if (mPlayOnAudioFocus && player.isPaused()) {
                        player.resume();
                        //} else if (isPlaying()) {
                        //    setVolume(MEDIA_VOLUME_DEFAULT);
                    }
                    mPlayOnAudioFocus = false;
                    break;

                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                    Log.d("TTSMEDIAPLAYER", "Something about ducks!?");
                    // this might be for dropping the sound while something else happens (text notifications)
                    //setVolume(MEDIA_VOLUME_DUCK);
                    break;

                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                    Log.d("TTSMEDIAPLAYER", "AUDIOFOCUS_LOSS_TRANSIENT!");
                    if (player.isPlaying()) {
                        // I think this is for temporary loss of focus e.g. calls/notificaitons
                        mPlayOnAudioFocus = true;
                        player.pause();
                    }
                    break;
                case AudioManager.AUDIOFOCUS_LOSS:
                    // Seems to be triggered when you press play in another media app (i.e. they requested focus)
                    Log.d("TTSMEDIAPLAYER", "AUDIOFOCUS_LOSS! abandoning focus, pausing speech");
                    mAudioManager.abandonAudioFocus(this);
                    if (player.isPlaying()) {
                        player.pause();
                        mPlayOnAudioFocus = false;
                    }
                    updateNotificationAndMediaButtons(false);
                    break;
                default:
                    Log.d("TTSMEDIAPLAYER", "AUDIOFOCUS_???");
            }
        }
    }
}

build.gradle

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'com.google.android.material:material:1.0.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.vectordrawable:vectordrawable:1.1.0'
implementation 'androidx.legacy:legacy-support-v13:1.0.0'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.media:media:1.1.0'
...

I’ve been stuck on this for a while so any help would be greatly appreciated.

Logs:

? I/MusicController: [MediaSessionMonitor.java:153:onActiveSessionsChanged()] oooooo 
? I/MusicController: [MediaSessionMonitor.java:302:clear()] oooooo 
? D/MusicController: [MediaSessionMonitor.java:99:clearMediaContorllersMap()] oooooo Controller is already empty
? W/MusicController: [MediaSessionMonitor.java:171:updateMediaControllers()] oooooo Controller is empty
? I/MediaFocusControl:  AudioFocus  requestAudioFocus() from uid/pid 10345/8858 clientId=android.media.AudioManagerEx@63b6ee9fishpowered.bar.services.TextToSpeechMediaControllerService$AudioFocusHelper@44f676e req=1 flags=0x0
? I/MusicController: [MediaSessionMonitor.java:153:onActiveSessionsChanged()] oooooo 
? I/MusicController: [MediaSessionMonitor.java:174:updateMediaControllers()] oooooo List size :1
? I/MusicController: [MediaSessionMonitor.java:178:updateMediaControllers()] oooooo MediaController received packageName foo.bar
? D/MusicController: [MediaSessionMonitor.java:74:addToMediaContorllersMap()] oooooo Added = android.media.session.MediaSession$Token@986e7dd
? I/MusicController: [MediaSessionMonitor.java:78:addToMediaContorllersMap()] oooooo mMediaContorllersMap.size() = 1
? I/MusicController: [MediaSessionMonitor.java:222:checkAndUpdateMusicController()] oooooo is MusicController Updated = false
? I/MusicController: [MediaSessionMonitor.java:182:updateMediaControllers()] oooooo mMediaContorllersMap size = 1
? I/MediaFocusControl:  AudioFocus  requestAudioFocus() from uid/pid 10345/8858 clientId=android.media.AudioManagerEx@63b6ee9fishpowered.bar.services.TextToSpeechMediaControllerService$AudioFocusHelper@44f676e req=1 flags=0x0
? I/MusicController: [MediaControllerCallbackWrapper.java:55:onMetadataChanged()] oooooo This callback is from foo.bar
? I/MusicController: [MediaControllerCallbackWrapper.java:47:onPlaybackStateChanged()] oooooo This callback is from foo.bar
? D/MusicController: [MediaSessionMonitor.java:123:handleMessage()] oooooo MediaSessionMonitor.MsgHandler msg = 2
? D/MusicController: [MediaSessionMonitor.java:205:checkAndUpdateMusicController()] oooooo state = 3, action = 585
? I/MusicController: [MediaSessionMonitor.java:234:isValidStateToRegister()] oooooo isValidStateToRegister = true
? I/MusicController: [MediaSessionMonitor.java:257:isValidMetadataToRegister()] oooooo isValidMetadataToRegister = true
? I/MusicController: [MediaSessionMonitor.java:245:isValidActionToRegister()] oooooo isValidActionToRegister = false
? I/MusicController: [MediaSessionMonitor.java:222:checkAndUpdateMusicController()] oooooo is MusicController Updated = false
? D/MusicController: [MediaSessionMonitor.java:123:handleMessage()] oooooo MediaSessionMonitor.MsgHandler msg = 1
? D/MusicController: [MediaSessionMonitor.java:205:checkAndUpdateMusicController()] oooooo state = 3, action = 585
? I/MusicController: [MediaSessionMonitor.java:234:isValidStateToRegister()] oooooo isValidStateToRegister = true
? I/MusicController: [MediaSessionMonitor.java:257:isValidMetadataToRegister()] oooooo isValidMetadataToRegister = true
? I/MusicController: [MediaSessionMonitor.java:245:isValidActionToRegister()] oooooo isValidActionToRegister = false
? I/MusicController: [MediaSessionMonitor.java:222:checkAndUpdateMusicController()] oooooo is MusicController Updated = false
? I/MusicController: [MediaControllerCallbackWrapper.java:47:onPlaybackStateChanged()] oooooo This callback is from foo.bar
? D/MusicController: [MediaSessionMonitor.java:123:handleMessage()] oooooo MediaSessionMonitor.MsgHandler msg = 1
? D/MusicController: [MediaSessionMonitor.java:205:checkAndUpdateMusicController()] oooooo state = 3, action = 585
? I/MusicController: [MediaSessionMonitor.java:234:isValidStateToRegister()] oooooo isValidStateToRegister = true
? I/MusicController: [MediaSessionMonitor.java:257:isValidMetadataToRegister()] oooooo isValidMetadataToRegister = true
? I/MusicController: [MediaSessionMonitor.java:245:isValidActionToRegister()] oooooo isValidActionToRegister = false
? I/MusicController: [MediaSessionMonitor.java:222:checkAndUpdateMusicController()] oooooo is MusicController Updated = false
? V/MediaRouter: Adding route: RouteInfo{ name=Phone, description=null, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO  groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO , presentationDisplay=null }
? V/MediaRouter: Adding route: RouteInfo{ name=DummyDevice, description=Bluetooth audio, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO  groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO , presentationDisplay=null }
? V/MediaRouter: Selecting route: RouteInfo{ name=DummyDevice, description=Bluetooth audio, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO  groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO , presentationDisplay=null }
? V/MediaRouter: Audio routes updated: AudioRoutesInfo{ type=SPEAKER, bluetoothName=DummyDevice }, a2dp=true
? W/MediaSessionCompat: Couldn't find a unique registered media button receiver in the given context.
? I/MusicController: [MediaSessionMonitor.java:153:onActiveSessionsChanged()] oooooo 
? I/MusicController: [MediaSessionMonitor.java:174:updateMediaControllers()] oooooo List size :1
? I/MusicController: [MediaSessionMonitor.java:178:updateMediaControllers()] oooooo MediaController received packageName foo.bar
? D/MusicController: [MediaSessionMonitor.java:76:addToMediaContorllersMap()] oooooo Already exist = android.media.session.MediaSession$Token@986e7dd
? I/MusicController: [MediaSessionMonitor.java:78:addToMediaContorllersMap()] oooooo mMediaContorllersMap.size() = 1
? D/MusicController: [MediaSessionMonitor.java:205:checkAndUpdateMusicController()] oooooo state = 3, action = 585
? I/MusicController: [MediaSessionMonitor.java:234:isValidStateToRegister()] oooooo isValidStateToRegister = true
? I/MusicController: [MediaSessionMonitor.java:257:isValidMetadataToRegister()] oooooo isValidMetadataToRegister = true
? I/MusicController: [MediaSessionMonitor.java:245:isValidActionToRegister()] oooooo isValidActionToRegister = false
? I/MusicController: [MediaSessionMonitor.java:222:checkAndUpdateMusicController()] oooooo is MusicController Updated = false
? I/MusicController: [MediaSessionMonitor.java:182:updateMediaControllers()] oooooo mMediaContorllersMap size = 1
? V/MediaRouter: Selecting route: RouteInfo{ name=DummyDevice, description=Bluetooth audio, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO  groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO , presentationDisplay=null }
? V/MediaRouter: Adding route: RouteInfo{ name=Phone, description=null, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO  groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO , presentationDisplay=null }
? V/MediaRouter: Adding route: RouteInfo{ name=DummyDevice, description=Bluetooth audio, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO  groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO , presentationDisplay=null }
? V/MediaRouter: Selecting route: RouteInfo{ name=DummyDevice, description=Bluetooth audio, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO  groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO , presentationDisplay=null }
? V/MediaRouter: Audio routes updated: AudioRoutesInfo{ type=SPEAKER, bluetoothName=DummyDevice }, a2dp=true
? V/MediaRouter: Selecting route: RouteInfo{ name=DummyDevice, description=Bluetooth audio, status=null, category=RouteCategory{ name=System types=ROUTE_TYPE_LIVE_AUDIO ROUTE_TYPE_LIVE_VIDEO  groupable=false }, supportedTypes=ROUTE_TYPE_LIVE_AUDIO , presentationDisplay=null }

Also I’m seeing an audio permission error but I’m not sure if this is related:

W/MediaListnrAuthObsrvr: registration failed - not an approved notification listener yet?
    java.lang.SecurityException: Missing permission to control media.
        at android.os.Parcel.readException(Parcel.java:1951)
        at android.os.Parcel.readException(Parcel.java:1897)
        at android.media.session.ISessionManager$Stub$Proxy.addSessionsListener(ISessionManager.java:342)
        at android.media.session.MediaSessionManager.addOnActiveSessionsChangedListener(MediaSessionManager.java:226)
        at android.media.session.MediaSessionManager.addOnActiveSessionsChangedListener(MediaSessionManager.java:189)
        at com.google.android.clockwork.common.media.DefaultMediaSessionManagerWrapper.addOnActiveSessionsChangedListener(AW771527612:8)
        at com.google.android.clockwork.companion.mediacontrols.api21.MediaSessionListenerAuthorizationObserver.register(AW771527612:12)
        at com.google.android.clockwork.companion.mediacontrols.api21.MediaSessionListenerAuthorizationObserver.<init>(AW771527612:5)
        at com.google.android.clockwork.companion.mediacontrols.api21.MediaRemoteControllerApi21.start(AW771527612:13)

Solution

I eventually discovered why this wasn’t working for me. It seems like there is a bug with Android Oreo that media focus cannot be properly obtained despite requesting for focus and playing audio using the TTS engine.

The workaround was to play a silent wav file from the system mediaplayer before commencing the TTS

Answered By – MeatPopsicle

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