private PendingIntent pendingIntent;

@Override
public void onCreate(Bundle savedInstanceState)
{

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, 18);
    calendar.set(Calendar.MINUTE, 40);
    calendar.set(Calendar.SECOND, 0);
    Intent myIntent = new Intent(MainActivity.this, MyReceiver.class);
    pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent,0);

    AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC, calendar.getTimeInMillis(), pendingIntent);

} //end onCreate

public static NotificationManager mManager;

@SuppressWarnings("static-access")
public static void generateNotification(Context context){

    mManager = (NotificationManager) context.getSystemService(context.NOTIFICATION_SERVICE);
    Intent intent1 = new Intent(context,MainActivity.class);
    Notification notification = new Notification(R.drawable.ic_launcher,"This is a test message!", System.currentTimeMillis());
    intent1.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP| Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingNotificationIntent = PendingIntent.getActivity(context,0, intent1,PendingIntent.FLAG_UPDATE_CURRENT);
    notification.flags |= Notification.FLAG_AUTO_CANCEL;
    notification.setLatestEventInfo(context, "AlarmManagerDemo", "This is a test message!", pendingNotificationIntent);
    mManager.notify(0, notification);
}

@Override
public IBinder onBind(Intent arg0)
{
    // TODO Auto-generated method stub
    return null;
}

@Override
public void onCreate()
{
    // TODO Auto-generated method stub
    super.onCreate();
}

@Override
public void onStart(Intent intent, int startId)
{
    super.onStart(intent, startId);
}

@Override
public void onDestroy()
{
    // TODO Auto-generated method stub
    super.onDestroy();
}

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