Simple Example of using LocalBroadcastManager in Android

LocalBroadcastExampleActivity.java

import android.app.Activity;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class LocalBroadcastExampleActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.log_list);
		
		Button buttonStartService = (Button)findViewById(R.id.button_ok);
		buttonStartService.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				//Register MessageService in Manifest to work
				startService(new Intent(LocalBroadcastExampleActivity.this, MessageService.class));
			}
		});

	}

	@Override
	protected void onPause() {
		// Unregister since the activity is paused.
		LocalBroadcastManager.getInstance(this).unregisterReceiver(
				mMessageReceiver);
		super.onPause();
	}

	@Override
	protected void onResume() {
		// Register to receive messages.
		// We are registering an observer (mMessageReceiver) to receive Intents
		// with actions named "custom-event-name".
		LocalBroadcastManager.getInstance(this).registerReceiver(
				mMessageReceiver, new IntentFilter("custom-event-name"));
		super.onResume();
	}

	// Our handler for received Intents. This will be called whenever an Intent
	// with an action named "custom-event-name" is broadcasted.
	private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			// TODO Auto-generated method stub
			// Get extra data included in the Intent
			String message = intent.getStringExtra("message");
			Log.d("receiver", "Got message: " + message);
		}
	};

	public class MessageService extends Service {

		@Override
		public IBinder onBind(Intent intent) {
			// TODO Auto-generated method stub
			return null;
		}

		@Override
		public int onStartCommand(Intent intent, int flags, int startId) {
			// TODO Auto-generated method stub
			sendMessage();
			return super.onStartCommand(intent, flags, startId);
		}
		
		// Send an Intent with an action named "custom-event-name". The Intent
		// sent should
		// be received by the ReceiverActivity.
		private void sendMessage() {
			Log.d("sender", "Broadcasting message");
			Intent intent = new Intent("custom-event-name");
			// You can also include some extra data.
			intent.putExtra("message", "This is my message!");
			LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
		}

	}

}

the above code didnot run for me asswell but it was helpful
here is what i did to make it run below is full tutrial

mainactivity
`package com.javacodegeeks.android.androidserviceexample;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.IntentFilter;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity {
private IntentFilter receiveFilter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    receiveFilter = new IntentFilter("custom-event-name");
    LocalBroadcastManager.getInstance(this).
            registerReceiver(handler, receiveFilter);

}

// Start the  service
public void startNewService(View view) {
    Intent intent=new Intent(this,MyService.class);
    intent.putExtra("string","string_value");
    this.startService(intent);
}

// Stop the  service
public void stopNewService(View view) {

    stopService(new Intent(this, MyService.class));
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

private BroadcastReceiver handler = new BroadcastReceiver() {

    int i =0 ;
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("TAGS", "BroadcastReceiver() {...}.onReceive()");
        Log.d("TAGS", String.valueOf(i));
        i=i+1;
        Toast.makeText(MainActivity.this,
                "Message received", Toast.LENGTH_LONG).show();



    }
`};`

}

`Myservice.java
package com.javacodegeeks.android.androidserviceexample;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.widget.Toast;

public class MyService extends Service {
public MyService() {
}

@Override
public IBinder onBind(Intent intent) {
    // TODO: Return the communication channel to the service.
    throw new UnsupportedOperationException("Not yet implemented");
}



@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    if (intent !=null){
        Log.d("TAGS_service_data", String.valueOf(intent.getExtras().getString("string")));

    }

    Toast.makeText(this, " Service Started", Toast.LENGTH_LONG).show();

    Log.d("TAGS", "MainActivity.send()");
    //Intent sendableIntent = new Intent(getClass().getName());
    Intent sendableIntent = new Intent("custom-event-name");

    sendableIntent.putExtra("result", "risult");

    LocalBroadcastManager.getInstance(this).
            sendBroadcast(sendableIntent);
    Log.d("TAGS", "sended_data");


    return Service.START_STICKY;

}

@Override
public void onCreate() {
    Toast.makeText(this, "The new Service was Created", Toast.LENGTH_LONG).show();

}

/* @OverRide
public void onStart(Intent intent, int startId) {
// For time consuming an long tasks you can launch a new thread here...
Toast.makeText(this, " Service Started", Toast.LENGTH_LONG).show();

    Log.d("TAGS", "MainActivity.send()");
    //Intent sendableIntent = new Intent(getClass().getName());
    Intent sendableIntent = new Intent("custom-event-name");

    sendableIntent.putExtra("result", "risult");

    LocalBroadcastManager.getInstance(this).
            sendBroadcast(sendableIntent);
    Log.d("TAGS", "sended_data");


}*/

@Override
public void onDestroy() {
    Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();

}

}`

android manifest.xml
add the service name under the application tag

Better to call super.onPause(); and super.onResume(); at the beginning of method. According this.

@dnadeau-quatral MessageService is inside Activity. Write the code for MessageService in separate file, do the manifest entry and then it will work properly.

@Antarix Thanks.

Simple and to the point thanks ! 😃

Thanks

This is the most self descriptive straight to the core demo.

@dnadeau-quatral it should be ".LocalBroadcastExampleActivity$MessageService" , just type . and it will suggest ".LocalBroadcastExampleActivity$MessageService"

Nice work, thanks.

Thank you

Thanks! I searched a reason why not working many hours. LocalBroadcastManager.getInstance(this).registerReceiver() - this is an answer! )))