Fix TTS audio routing for Android Auto

Set AudioAttributes (USAGE_ASSISTANT) on the TTS engine itself, not just on the AudioFocusRequest. Without this, TTS output goes to the phone speaker instead of routing through Android Auto's head unit.
2026-03-10 12:46:36 +00:00
1 changed files with 2 additions and 0 deletions
@@ -52,6 +52,8 @@ class TTSManager(
        tts = TextToSpeech(context) { status ->
            if (status == TextToSpeech.SUCCESS) {
                tts?.language = Locale.US
+                // Route TTS audio through Android Auto head unit
+                tts?.setAudioAttributes(audioFocusRequest.audioAttributes)
                tts?.setOnUtteranceProgressListener(object : UtteranceProgressListener() {
                    override fun onStart(utteranceId: String?) {
                        LatencyTracker.markT5() // t5: First audio frame