ServiceDemo 0.2

BackgroundService.java

package com.example.suvajit.servicedemo;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.widget.Toast;

public class BackgroundService extends Service {
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Toast.makeText(BackgroundService.this, "Service Started...", Toast.LENGTH_SHORT).show();
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        Toast.makeText(BackgroundService.this, "Service Will Be Restarted...", Toast.LENGTH_SHORT).show();
        sendBroadcast(new Intent("RestartMe"));
    }
}

MainActivity.java

package com.example.suvajit.servicedemo;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.firebase.iid.FirebaseInstanceId;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btnShowToken = (Button) findViewById(R.id.buttonShowToken);
        btnShowToken.setOnClickListener(this);

        Intent intentService = new Intent(this,BackgroundService.class);
        startService(intentService);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.buttonShowToken:
                //Code to show Token
                String token = FirebaseInstanceId.getInstance().getToken();
                Toast.makeText(MainActivity.this, token, Toast.LENGTH_SHORT).show();
                Log.i("MainActivity: FB Token",token);
                break;
        }
    }
}

RestartBackgroundService.java

package com.example.suvajit.servicedemo;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class RestartBackgroundService extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {

//        I have also used AlarmManager , but it doesn't make any difference for me
//        AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
//        PendingIntent pi = PendingIntent.getService(context, 0, new Intent(context, BackgroundService.class), PendingIntent.FLAG_UPDATE_CURRENT);
//        int interval = 5000;
//        am.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + interval, interval, pi);

        context.startService(new Intent(context.getApplicationContext(),BackgroundService.class));
    }
}