Android Messenger IPC 通信

服务端通知客户端

客户端：

MainActivity.java

protected void onStart() {    super.onStart();    // Start service and provide it a way to communicate with this class.    Intent startServiceIntent = new Intent(this, MyJobService.class);    Messenger messengerIncoming = new Messenger(mHandler);    startServiceIntent.putExtra(MESSENGER_INTENT_KEY, messengerIncoming);    startService(startServiceIntent);}

服务端

MyJobService.java

@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {    mActivityMessenger = intent.getParcelableExtra(MESSENGER_INTENT_KEY);    return START_NOT_STICKY;}

long duration = params.getExtras().getLong(WORK_DURATION_KEY);// Uses a handler to delay the execution of jobFinished().Handler handler = new Handler();handler.postDelayed(new Runnable() {    @Override    public void run() {        sendMessage(MSG_COLOR_STOP, params.getJobId());        jobFinished(params, false);    }}, duration);Log.i(TAG,

private void sendMessage(int messageID, @Nullable Object params) {    // If this service is launched by the JobScheduler, there's no callback Messenger. It    // only exists when the MainActivity calls startService() with the callback in the Intent.    if (mActivityMessenger == null) {        Log.d(TAG, "Service is bound, not started. There's no callback to send a message to.");        return;    }    Message m = Message.obtain();    m.what = messageID;    m.obj = params;    try {        mActivityMessenger.send(m);    } catch (RemoteException e) {        Log.e(TAG, "Error passing service object back to activity.");    }}

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