问如何通过定期从独立进程中的Android后台服务调用api来发送通知

EN

public class NotificationService extends IntentService { 

    public NotificationService() {

        super("NotificationService");

    }

    @Override

    protected void onHandleIntent(Intent intent) { 

        //call api

        sendNotification();

    } 
    private void sendNotification() {

        NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.ic_launcher)
                        .setContentTitle("Hello")
                        .setContentText("Hello World")
                        .setAutoCancel(true); 
        Intent resultIntent = new Intent(this, MainActivity.class);  
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this); 
        stackBuilder.addParentStack(MainActivity.class);
        stackBuilder.addNextIntent(resultIntent);
        PendingIntent resultPendingIntent =
                stackBuilder.getPendingIntent(
                        0,
                        PendingIntent.FLAG_UPDATE_CURRENT
                );
        mBuilder.setContentIntent(resultPendingIntent);
        NotificationManager mNotificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 
        mNotificationManager.notify(1, mBuilder.build());
        playNotificationSound();

    }
}

public class NotificationServiceReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Intent dailyUpdater = new Intent(context, NotificationService.class);

        context.startService(dailyUpdater); 
    }
}

private void setRecurringAlarm(Context context) {

        Calendar updateTime = Calendar.getInstance();
        updateTime.setTimeZone(TimeZone.getDefault()); 
        Intent downloader = new Intent(context, NotificationServiceReceiver.class);
        downloader.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 123546, downloader, PendingIntent.FLAG_CANCEL_CURRENT);

        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, updateTime.getTimeInMillis(), REPEAT_TIME, pendingIntent);


    }