How to use LocalBroadcastManager?

Question

How to use/locate LocalBroadcastManager as described in google docs and Service broadcast doc?

I tried to google it, but there is no code available to start with?

The documents say that I should use it if I want to do broadcast internally with in my app's process but I don't know where to look for this.

Any help/comment?

Update: I know how to use Broadcasts but don't know how to get LocalBroadcastManager available in my project.

Answer 1

On Receiving end:

• First register LocalBroadcast Receiver

• Then handle incoming intent data in onReceive.

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
  
        LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(this);
        lbm.registerReceiver(receiver, new IntentFilter("filter_string"));
    }
  
    public BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent != null) {
                String str = intent.getStringExtra("key");
                // get all your data from intent and do what you want 
            }
        }
    };
  

On Sending End:

   Intent intent = new Intent("filter_string");
   intent.putExtra("key", "My Data");
   // put your all data using put extra 

   LocalBroadcastManager.getInstance(this).sendBroadcast(intent);

Answer 2

I'd rather like to answer comprehensively.

1. LocalbroadcastManager included in android 3.0 and above so you have to use support library v4 for early releases. see instructions here

2. Create a broadcast receiver:

   private BroadcastReceiver onNotice= new BroadcastReceiver() {
   
       @Override
       public void onReceive(Context context, Intent intent) {
           // intent can contain anydata
           Log.d("sohail","onReceive called");
           tv.setText("Broadcast received !");
   
       }
   };
   

3. Register your receiver in onResume of activity like:

   protected void onResume() {
           super.onResume();
   
           IntentFilter iff= new IntentFilter(MyIntentService.ACTION);
           LocalBroadcastManager.getInstance(this).registerReceiver(onNotice, iff);
       }
   
   //MyIntentService.ACTION is just a public static string defined in MyIntentService.
   

4. unRegister receiver in onPause:

   protected void onPause() {
     super.onPause();
     LocalBroadcastManager.getInstance(this).unregisterReceiver(onNotice);
   }
   

5. Now whenever a localbroadcast is sent from applications' activity or service, onReceive of onNotice will be called :).

Edit: You can read complete tutorial here LocalBroadcastManager: Intra application message passing