How To give notifications on android on specific time?

Question

I want to give notification to my app on a specific time. Say everyday i have to give notification on 7 AM even if the app is closed.

How can i do this? Any tutorial? Please mention the link.

Answer 1

First you need to use a BroadcastReceiver, and because a broadcast receiver can only run for a short time, it's a better practice to use an intent service, here you have an example how to do it.

When handling a broadcast, the application is given a fixed set of time (currently 10 seconds) in which to do its work. If it doesn't complete in that time, the application is considered to be misbehaving, and its process immediately tossed into the background state to be killed for memory if needed.

(from the android developer blog)

This is the broadcast receiver class:

    public class MyReceiver extends BroadcastReceiver {
        public MyReceiver() {
        }

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

            Intent intent1 = new Intent(context, MyNewIntentService.class);
            context.startService(intent1);
        }
    }

Register it in the manifest:

    <receiver
        android: name=".MyReceiver"
        android: enabled="true"
        android: exported="false" >
    </receiver>

This is the intent service class:

    public class MyNewIntentService extends IntentService {
        private static final int NOTIFICATION_ID = 3;

        public MyNewIntentService() {
            super("MyNewIntentService");
        }

        @Override
        protected void onHandleIntent(Intent intent) {
            Notification.Builder builder = new Notification.Builder(this);
                builder.setContentTitle("My Title");
                builder.setContentText("This is the Body");
                builder.setSmallIcon(R.drawable.whatever);
            Intent notifyIntent = new Intent(this, MainActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(this, 2, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);
            //to be able to launch your activity from the notification 
            builder.setContentIntent(pendingIntent);
            Notification notificationCompat = builder.build();
            NotificationManagerCompat managerCompat = NotificationManagerCompat.from(this);
            managerCompat.notify(NOTIFICATION_ID, notificationCompat);
        }
    }

Register it in the manifest:

    <service
        android: name=".MyNewIntentService"
        android: exported="false" >
    </service>

Then in your activity, set the alarm manager to start the broadcast receiver at a specific time and use AlarmManager's setRepeating method to repeat it. In the example below, it will repeat it every day:

    
     Intent notifyIntent = new Intent(this,MyReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast
                (context, NOTIFICATION_REMINDER_NIGHT, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,  System.currentTimeMillis(),
                1000 * 60 * 60 * 24, pendingIntent);

I hope this will help you.