SystemUI接到通知播声音提示原理

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在手机接收到notification的时候，有静音，震动，声音三种提示方式，特意说明下声音播放的触发流程：

在SystemUI启动的时候，会start()一个媒体播放类：

public class RingtonePlayer extends SystemUI {private static final String TAG = "RingtonePlayer";private static final String TAGG = "NotificationPlayer";private static final boolean LOGD = false | (SystemProperties.getInt("ro.debuggable", 0) == 1);// TODO: support Uri switching under same IBinderprivate IAudioService mAudioService;private final NotificationPlayer mAsyncPlayer = new NotificationPlayer(TAG);private final HashMap<IBinder, Client> mClients = new HashMap<IBinder, Client>();@Overridepublic void start() {mAsyncPlayer.setUsesWakeLock(mContext);mAudioService = IAudioService.Stub.asInterface(ServiceManager.getService(Context.AUDIO_SERVICE));try {//将一个媒体播放回调实例mCallback传递给AudioService.java        mAudioService.setRingtonePlayer(mCallback);} catch (RemoteException e) {Log.e(TAG, "Problem registering RingtonePlayer: " + e);}}private IRingtonePlayer mCallback = new IRingtonePlayer.Stub() {@Overridepublic void play(IBinder token, Uri uri, int streamType) throws RemoteException {if (LOGD) {Log.d(TAG, "play(token=" + token + ", uri=" + uri + "

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