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…ptions Introduce system AudioFocus linkage to resolve issue shilapi#36 where native head-unit audio (e.g., Bluetooth phone calls, radio, navigation guidance) conflicts with CarPlay media playback. 1. AudioFocusCoordinator: requests system audio focus based on channel priority (MEDIA: GAIN, PHONE: GAIN_TRANSIENT, ASSISTANT: GAIN_TRANSIENT_MAY_DUCK). 2. Ducking & Auto-yield: ducks media playback to 20% volume on AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK, mutes media on AUDIOFOCUS_LOSS_TRANSIENT (e.g., car Bluetooth calls or native voice prompts), and restores full volume on AUDIOFOCUS_GAIN. 3. AirPlayPersistence & CarPlayHostActivity: adds user toggles for Audio Focus and temporary mute auto-yield with persistent storage and resolution summary. 4. AudioFocusCoordinatorTest: adds unit tests covering channel priority ordering and volume constants.
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Summary
Introduce structured Android
AudioFocuscoordination for CarPlay media playback, automatically yielding audio to external car events (radio, Bluetooth calls, navigation announcements) and restoring playback seamlessly.Problem
The media sink previously played decoded PCM audio straight to
AudioTrackwithout requesting or monitoring AndroidAudioManager.OnAudioFocusChangeListener. When other audio sources in the car (such as native navigation alerts, cluster prompts, or external media apps) played, audio would either overlap harshly or compete for the hardware sound card.Solution
AudioFocusCoordinatorsupporting modernAudioFocusRequest(API 26+) and legacy focus management with ducking and transient loss handling.AndroidMediaSinkto request focus before playback and automatically pause/duck when focus is lost.