What is the default audio stream of TTS?

Question

As far as I can tell, there are currently are 7 audio streams in Android:

STREAM_ALARM         (for alarms)
STREAM_DTMF          (for DTMF Tones)
STREAM_MUSIC            


        

Answer 1

STREAM_MUSIC is the default in the AOSP source, defined in TextToSpeech.java (line 164 as of this writing) in frameworks/base.git:

/**
 * Default audio stream used when playing synthesized speech.
 */
public static final int DEFAULT_STREAM = AudioManager.STREAM_MUSIC;