有人知道如何在设备的听筒或耳机中播放音轨吗?
我用过这个:
AudioManager audio_service = (AudioManager) getSystemService
(Context.AUDIO_SERVICE);
// set the mode in call, so that the sound can come from earpiece
audio_service.setSpeakerphoneOn(false);
audio_service.setMode(AudioManager.MODE_IN_CALL);
audio_service.setRouting(AudioManager.MODE_NORMAL,
AudioManager.ROUTE_EARPIECE, AudioManager.ROUTE_ALL);
mediaplayer.start();
但什么也没发生..:| 谁能给我打电话?