AudioService

frameworks/base/media/java/android/media/AudioService.java

public void adjustStreamVolume(int streamType, int direction, int flags){
sendVolumeUpdate(streamType, oldIndex, index);
}

private void setVolumeUpdate(int streamType, int oldIndex, int index){
    Intent intent = new Intent(AudioManager.VOLUME_CHANGED_ACTION);
    intent.putExtra(AudioManager.EXTRA_VOLUME_STREAM_TYPE, streamType);
    intent.putExtra(AudioManager.EXTRA_VOLUME_STREAM_VALUE, index);
    intent.putExtra(AudioManager.EXTRA_PREV_VOLUME_STREAM_VALUE, oldIndex);
    mContext.sendBroadcast(intent);
}

构造函数

        IntentFilter intentFilter =
                new IntentFilter(Intent.ACTION_HEADSET_PLUG);
        intentFilter.addAction(BluetoothA2dp.ACTION_SINK_STATE_CHANGED);
        intentFilter.addAction(BluetoothHeadset.ACTION_STATE_CHANGED);
        intentFilter.addAction(Intent.ACTION_DOCK_EVENT);
        intentFilter.addAction(BluetoothHeadset.ACTION_AUDIO_STATE_CHANGED);
        intentFilter.addAction(Intent.ACTION_FM);
        context.registerReceiver(mReceiver, intentFilter);

 private final BroadcastReceiver mReceiver = new AudioServiceBroadcastReceiver();

private class AudioServiceBroadcastReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
        }
}

 

3rdparty/bluetooth/BRCM4330_BT/special/android/packages/apps/FMPlayer/src/com/thunderst/radio/FMPlay.java

public boolean onCheckedChanged(View  view, boolean checked){

switch(view.getId()){

case R.id.headset_toggle:

Message msg = mHandler.obtainMessage(MSG_ROUTE);

mHandler.sendMessage(msg);

}

}

private Handle mHandler = new Handler(){

    public void handleMessage case MSG_ROUTE: mService.routeAudio(...);

}

FM 切换到耳机 routeAudio(0); 切换到外放 routeAudio(1);

Intent intent = new Intent(Intent.ACTION_FM);

intent.putExtra("state", 1);

intent.putExtra("speaker", mAudioDevice);

sendBroadcast(intent);