Programmatically register a broadcast receiver

Question

I\'d like to know what is the best practice/way of programmatically register a broadcast receiver. I want to register specific receivers according to user choice.

As

Answer 1

In your onCreate method you can register a receiver like this:

private BroadcastReceiver receiver;

@Override
public void onCreate(Bundle savedInstanceState){

  // your oncreate code should be

  IntentFilter filter = new IntentFilter();
  filter.addAction("SOME_ACTION");
  filter.addAction("SOME_OTHER_ACTION");

  receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
      //do something based on the intent's action
    }
  };
     registerReceiver(receiver, filter);
}

Remember to run this in the onDestroy method:

 @Override
 protected void onDestroy() {
  if (receiver != null) {
   unregisterReceiver(receiver);
   receiver = null;
  }
  super.onDestroy();
 }

Answer 2

Create a broadcast receiver

[BroadcastReceiver(Enabled = true, Exported = false)]

public class BCReceiver : BroadcastReceiver
{

    BCReceiver receiver;

    public override void OnReceive(Context context, Intent intent)
    {
        //Do something here
    }
}

From your activity add this code:

LocalBroadcastManager.getInstance(ApplicationContext)
    .registerReceiver(receiver, filter);

Answer 3

It is best practice to always supply the permission when registering the receiver, otherwise you will receive for any application that sends a matching intent. This can allow malicious apps to broadcast to your receiver.

Answer 4

It sounds like you want to control whether components published in your manifest are active, not dynamically register a receiver (via Context.registerReceiver()) while running.

If so, you can use PackageManager.setComponentEnabledSetting() to control whether these components are active:

http://developer.android.com/reference/android/content/pm/PackageManager.html#setComponentEnabledSetting(android.content.ComponentName, int, int)

Note if you are only interested in receiving a broadcast while you are running, it is better to use registerReceiver(). A receiver component is primarily useful for when you need to make sure your app is launched every time the broadcast is sent.

Answer 5

for LocalBroadcastManager

   Intent intent = new Intent("any.action.string");
   LocalBroadcastManager.getInstance(context).
                                sendBroadcast(intent);

and register in onResume

LocalBroadcastManager.getInstance(
                    ActivityName.this).registerReceiver(chatCountBroadcastReceiver, filter);

and Unregister it onStop

LocalBroadcastManager.getInstance(
                ActivityName.this).unregisterReceiver(chatCountBroadcastReceiver);

and recieve it ..

mBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.e("mBroadcastReceiver", "onReceive");
        }
    };

where IntentFilter is

 new IntentFilter("any.action.string")

Answer 6

Define a broadcast receiver anywhere in Activity/Fragment like this:

mReceiver = new BroadcastReceiver() {
 @Override
 public void onReceive(Context context, Intent intent) {
     Log.d(TAG," onRecieve"); //do something with intent
   }
 };

Define IntentFilter in onCreate()

mIntentFilter=new IntentFilter("action_name");

Now register the BroadcastReciever in onResume() and Unregister it in onPause() [because there is no use of broadcast if the activity is paused].

@Override
protected void onResume() {
     super.onResume();
     registerReceiver(mReceiver, mIntentFilter);
}

@Override
protected void onPause() {
    if(mReceiver != null) {
            unregisterReceiver(mReceiver);
            mReceiver = null;
    }
    super.onPause();
}

For detail tutorial, have a look at broadcast receiver-two ways to implement.