Notification at Specific Time using BroadcastReceiver and AlarmManager

Question

I want to send notification at specific time using broadcast receiver. many tutorials videos and also answers has been read in this regard and all of them was clear. but I c

Answer 1

You can send notification at specific time daily by following method

Calendar calendar = Calendar.getInstance();
         calendar.set(Calendar.HOUR_OF_DAY, 12);
         calendar.set(Calendar.MINUTE, 0);
         calendar.set(Calendar.SECOND, 0);

Intent notifyIntent = new Intent(getApplicationContext(),showNotification.class);
       notifyIntent.setFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES);
PendingIntent pendingIntent = PendingIntent.getBroadcast(etApplicationContext(),0,notifyIntent,PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
       alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,  calendar.getTimeInMillis(),1000 * 60 * 60 * 24, pendingIntent);

Then in showNotification class

public class showNotification extends BroadcastReceiver {

public showNotification() {

}

@Override
public void onReceive(Context context, Intent intent) {
   sendNotification(context);
}

private void sendNotification(Context context) {


    Uri defaultSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

    Intent intent = new Intent(context, SecondActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent,PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationManager notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
    String NOTIFICATION_CHANNEL_ID = "101";

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
        @SuppressLint("WrongConstant") NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "Notification", NotificationManager.IMPORTANCE_MAX);

        //Configure Notification Channel
        notificationChannel.setDescription("Game Notifications");
        notificationChannel.enableLights(true);
        notificationChannel.setVibrationPattern(new long[]{200});
        notificationChannel.enableVibration(false);

        notificationManager.createNotificationChannel(notificationChannel);
    }

    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID)
            .setSmallIcon(R.mipmap.ic_launcher_round)
            .setContentTitle(title.get("Title of notification"))
            .setContentText(subText.get("Sub text of notification"))
            .setAutoCancel(true)
            .setSound(defaultSound)
            .setContentIntent(pendingIntent)
            .setWhen(System.currentTimeMillis())
            .setPriority(Notification.PRIORITY_MAX);


    notificationManager.notify(1, notificationBuilder.build());

}

}