LocalBroadcastManager  which used to update the one activity or fragment data from another one,Example if we have two activity A and B, from activity A navgate to activity B and if i do some change in activty b and if those changes should reflect on activity A the we can use the following Methord.the Advantage is that we can do this from any cla…

LocalBroadcastManager ActivityA.java

//ActivityA.java

@Override
public void onCreate(Bundle savedInstanceState) {

  

  // Register to receive messages.
  .
  LocalBroadcastManager.getInstance(this).registerReceiver(mReceiver,
      new IntentFilter("GetData"));//Getname is the action name this should important this action name should be same from activity b othereviser recever willnot recevs the data
}

// Received Intents will called whenever an Intent
// with an action named "GetData" is broadcasted from the Activity B
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
  @Override
  public void onReceive(Context context, Intent intent) {
    // Get extra data included in the Intent
    String mDataFromActivityB = intent.getStringExtra("data");
    Log.d("Data", "" + message);
  }
};

@Override
protected void onDestroy() {
  // Unregister when activity finished
  
  LocalBroadcastManager.getInstance(this).unregisterReceiver(mReceiver);
  super.onDestroy();
}

LocalBroadcastManager ActivityB.java

//ActivityB.java


    // For Example here we notify the change in ActivityB to Activity A bya Button click.
    public void mButtonClick(View v)
   { 
      Log.d("sending", "data");
    Intent mintent = new Intent("GetData");
    mintent.putExtra("data", "changed the data");
    LocalBroadcastManager.getInstance(this).sendBroadcast(mintent);
    }