How do I determine when Google maps is Speaking in Android

Question

I'm trying to modify my application to pause audio playback when Google maps is announcing a turn by turn direction.

I've added the following code (shown below) to my application. The audio focus listener is called when applications like Pandora Radio or Spotify request audio focus in order to play music but it's not called when Google maps announces a turn by turn direction. Is there another intent I should be listening for in order to detect this behavior?

 AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    audioManager.requestAudioFocus(new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
            .setAudioAttributes(
                    new AudioAttributes.Builder()
                            .setUsage(AudioAttributes.USAGE_MEDIA)
                            .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                            .build()
            )
            .setAcceptsDelayedFocusGain(true)
            .setOnAudioFocusChangeListener(new AudioManager.OnAudioFocusChangeListener() {
                @Override
                public void onAudioFocusChange(int focusChange) {
                    // This is called by Pandora Radio and Spotify
                    Log.d("Focus change:", " Event is: " + focusChange);
                }
            }).build());

Answer 1

You will need AudioManager's AudioPlaybackCallback updates.

This only works on Android O and above.

To do this you have to access the audio manager -

 AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

And then add the listener like this -

Handler handler = new Handler();

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    audioManager.registerAudioPlaybackCallback(new AudioManager.AudioPlaybackCallback() {
        @Override
        public void onPlaybackConfigChanged(List<AudioPlaybackConfiguration> configs) {
             super.onPlaybackConfigChanged(configs);
            // This will be called when navigation audio state on google maps changes
            Log.d("audio active", String.valueOf(audioManager.isMusicActive()));
        }
    }, handler);
}

The List<AudioPlaybackConfiguration> configs returned in the callback has a AudioAttribute object which contains a string describing the audio playing. For Google maps navigation the String constant value is USAGE_ASSISTANCE_NAVIGATION_GUIDANCE which you can compare to be sure that it is Google Maps announcing the navigation direction.

Programatically you can get it like this

// Loop through the configs to see the media's usage data
configs.get(0).getAudioAttributes().getUsage();