动态注册后，Android Broadcast Receiver不会唤醒应用程序

Question

I have a situation where I only want to register a BroadcastReceiver for Time changed on certain platforms. For performance reasons, I would like to register the receiver dynamically via the context.registerReceiver method only on the platforms needed. I can detect the platform on app first run and decide if I would like to listen to this event.

While testing this approach I have found that when registering via context.registerReceiver the application will not be woken up if the process is not running.

Is this expected and is there a setting to get around it?

IntentFilter filter = new IntentFilter(Intent.ACTION_TIME_CHANGED); 
this.getApplicationContext().registerReceiver(new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            Log.e("MYTAG", "Received Broadcast from dyn one");


        }
    }, filter);

Answer 1

When your broadcast registered dynamically you can receive messages only when your application is running. If you want it to wake up you need to declare your broadcast in manifest

Answer 2

A dynamically registered receiver has a short lifetime so it wont wake up your device always. You have to declare it in your Manifest if you want it to behave they way you need!

PS: Had exactly the same problem recently so i am pretty sure for this!