android – how can I notify a running activity from a broadcast receiver?-ThrowExceptions

Exception or error:

I have an activity, it needs to response to a broadcast event.
Since an activity can not be a broadcast receiver at the same time,
I made a broadcast receiver.

My question is: how can I notify the activity from the broadcast receiver?
I believe this is a common situation, so is there a design pattern for this?

How to solve:

The broadcast is the notification. 🙂 If you want to say, start an activity or a service, etc., based on a received broadcast then you need a standalone broadcast receiver and you put that in your manifest file. However, if you want your activity itself to respond to broadcasts then you create an instance of a broadcast receiver in your activity and register it there.

The pattern I use is:

public class MyActivity extends Activity {
    private BroadcastReceiver receiver = new BroadcastReceiver() {
        public void onReceive(...) {

    public void onResume() {

        IntentFilter filter = new IntentFilter();

        this.registerReceiver(this.receiver, filter);

    public void onPause() {


So, this way the receiver is instantiated when the class is created (could also do in onCreate). Then in the onResume/onPause I handle registering and unregistering the receiver. Then in the reciever’s onReceive method I do whatever is necessary to make the activity react the way I want to when it receives the broadcast.

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