ServiceForNotifications

public class MainActivity extends AppCompatActivity {

    Button buttonStart;
    Button buttonStop;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        buttonStart = (Button)findViewById(R.id.startService);
        buttonStop = (Button)findViewById(R.id.stopService);
        startMyService();
        stopMyService();


    }

    public void startMyService(){
        buttonStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                    // Construct an intent that will execute the AlarmReceiver
                    Intent intent = new Intent(getApplicationContext(), MyAlarmReceiver.class);
                    // Create a PendingIntent to be triggered when the alarm goes off
                    final PendingIntent pIntent = PendingIntent.getBroadcast(getApplicationContext(), MyAlarmReceiver.REQUEST_CODE,
                            intent, PendingIntent.FLAG_UPDATE_CURRENT);
                    // Setup periodic alarm every 5 seconds
                    long firstMillis = System.currentTimeMillis(); // alarm is set right away
                    AlarmManager alarm = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);
                    // First parameter is the type: ELAPSED_REALTIME, ELAPSED_REALTIME_WAKEUP, RTC_WAKEUP
                    // Interval can be INTERVAL_FIFTEEN_MINUTES, INTERVAL_HALF_HOUR, INTERVAL_HOUR, INTERVAL_DAY
                    alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP, firstMillis,
                            AlarmManager.INTERVAL_FIFTEEN_MINUTES, pIntent);

            }
        });
    }

    public void stopMyService(){
        buttonStop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplicationContext(),MyServiceClass.class);
                stopService(intent);
            }
        });
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}



// AlarmReciever Class


public class MyAlarmReceiver extends BroadcastReceiver {
    public static final int REQUEST_CODE = 12345;

    // Triggered by the Alarm periodically (starts the service to run task)
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent i = new Intent(context, MyServiceClass.class);
        context.startService(i);
    }


}

//Service Class


public class MyServiceClass extends IntentService {

    public MyServiceClass() {
        super("My_Worker_Thread");
    }




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

        Toast.makeText(getApplicationContext(),"Service Start",Toast.LENGTH_LONG).show();
        NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext());
        Intent notificationIntent = new Intent(getApplicationContext(), MainActivity.class);
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(getApplicationContext());
        stackBuilder.addParentStack(MainActivity.class);
        stackBuilder.addNextIntent(notificationIntent);

        PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
        Notification notification = builder.setContentTitle("Weather App Notification")
                .setContentText("Don't miss New Weather update!")
                .setTicker("New Weather Alert!")
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentIntent(pendingIntent).build();

        NotificationManager notificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(0, notification);        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        Toast.makeText(getApplicationContext(),"Service Stopped",Toast.LENGTH_LONG).show();
        super.onDestroy();
    }

    @Override
    protected void onHandleIntent(Intent intent) {



    }
}