CODE EXAMPLE FOR JAVA

Service vs IntentService.

package com.journaldev.androidintentservices;

import android.app.IntentService;
import android.content.Intent;
import android.os.SystemClock;
import android.support.v4.content.LocalBroadcastManager;

public class MyService extends IntentService {

    public MyService() {
        super("MyService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {

        String message = intent.getStringExtra("message");
        intent.setAction(MainActivity.FILTER_ACTION_KEY);
        SystemClock.sleep(3000);
        String echoMessage = "IntentService after a pause of 3 seconds echoes " + message;
        LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent.putExtra("broadcastMessage", echoMessage));
    }
}