Write your first BroadcastReceiver

What is a BroadcastReceiver in Android

BroadcastReceiver is a Component type(Activity, Service, BroadcastReceiver, ContentProvider ) which allows your application to register for Global as well as local events.

Global events: Phone is plugged in, WIFI available etc.

How to write one?

You have to take care of 4 things

1. Write a Receiver
2. Register your receiver
3. Write Broadcast Message
4. Send Broadcast Message

Simple :)

Write a Receiver

public class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
  
        if(intent.getAction().equals("SomeName"))
        {
              // Write Action that need to run when Recevies a Broadcast Message
             Toast.makeText(context,"headset changed",Toast.LENGTH_SHORT).show();
        }
    }
}

Register your receiver

BroadcastReceiver receiver = new MyReceiver();
   IntentFilter filter = new IntentFilter("SomeName");
   registerReceiver(receiver,filter);

Write Broadcast Message

Intent i = new Intent("SomeName");

or

Intent i = new Intent();
  i.setAction("SomeName");

Send Broadcast Message

sendBroadcast(i);

That’s it.

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