// this
        String ns = Context.NOTIFICATION_SERVICE;
        NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);

        int icon = R.drawable.notification_icon;        
        CharSequence tickerText = "هشدار"; // ticker-text
        long when = System.currentTimeMillis();         
        Context context = getApplicationContext();     
        CharSequence contentTitle = "هشدار";  
        CharSequence contentText = "اکانت شما به زودی منقضی میشود، لطفا نسبت به شارژ اکانت خود اقدام فرمایید.";      
        Intent notificationIntent = new Intent(this, MainActivity.class);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
        @SuppressWarnings("deprecation")
		Notification notification = new Notification(icon, tickerText, when);
        notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);

        // and this
        final int HELLO_ID = 1;
        mNotificationManager.notify(HELLO_ID, notification);