TTS output always going to A2DP

Question

My Android tutorial states that I can explicitly tell the TTS engine which stream to use:

For music playback:

params.put(TextToSpeech.Engine.KEY_PARA         


        

Answer 1

I got this working for the most part, on most devices. Here is the part that starts the TTS on the voice call stream using Bluetooth SCO instead of A2DP.

if (mTtsReady) {
    myHash = new HashMap();

    myHash.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, "A2DP_Vol");

    OLD_AUDIO_MODE = am2.getMode();
    if(SMSstream == 1){
        if (am2.isBluetoothScoAvailableOffCall()) {
            am2.startBluetoothSco();
        }
        if(!am2.isSpeakerphoneOn()){
            speakerPhoneWasOn = false;
            am2.setSpeakerphoneOn(true);
        }
        myHash.put(TextToSpeech.Engine.KEY_PARAM_STREAM,
                String.valueOf(AudioManager.STREAM_VOICE_CALL));
        am2.requestAudioFocus(null, AudioManager.STREAM_VOICE_CALL,
                AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);

    }
    else{
        am2.requestAudioFocus(null, AudioManager.STREAM_MUSIC,
        AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
        myHash.put(TextToSpeech.Engine.KEY_PARAM_STREAM,
                String.valueOf(AudioManager.STREAM_MUSIC));
    }

    new CountDownTimer(SMS_DELAY, SMS_DELAY/2) {

        @Override
        public void onFinish() {
            try {
                mTts.speak(str, TextToSpeech.QUEUE_ADD,
                        myHash);
            } catch (Exception e) {
                Toast.makeText(application,
                        R.string.TTSNotReady,
                        Toast.LENGTH_LONG).show();
                e.printStackTrace();
            }

        }

        @Override
        public void onTick(long arg0) {

        }

    }.start();
}

Now I just have a problem getting the stream to revert back when done. It all works fine to read TTS. It will pause any music, play the TTS, and then resume music fine. However, when I exit the app later the stream for media now plays through the phone earpiece until I reboot. I posted that question here: Audio stream stays on earpiece after using AudioManager

You can see my whole project here: http://code.google.com/p/a2dpvolume/