How to set alarm to show a notification at future date with AlarmManager?

Lets assume you want to do a job a future time or show a notification at a selected time. AlarmManager can help to send an intent in future time. First we need to select date,

Lets create a date in 2050,

Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, 2050);
Date date = calendar.getTime();

For showing notification we need a service.

public class AlarmReceiver extends Service {

    public AlarmReceiver() {
    }

    @Override    public IBinder onBind(Intent intent) {
    }
}

Add service to Manifest.xml

<service    android:name="com.kozaxinan.example.alarm.AlarmReceiver"    android:enabled="true"    android:exported="true" ></service>

We will modify AlarmReceiver for sending notification. But first we need to register a alarm.

AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent intent = new Intent(this, AlarmReceiver.class);intent.putExtra("Alarm", true);
PendingIntent pendingIntent = PendingIntent.getService(this, 0, intent, 0);
// Sets an alarm - note this alarm will be lost if the phone is turned off and on again
alarmManager.set(AlarmManager.RTC, date.getTime(), pendingIntent);

This will start AlarmReceiver service In 2050, at the moment. So our service need to show a notification.

public class AlarmReceiver extends Service {

    public AlarmReceiver() {
    }

    public static final int NOTIFICATION_ID = 5111;
    /**     * Class for clients to access     */    public class ServiceBinder extends Binder {

        AlarmReceiver getService() {
            return AlarmReceiver.this;        }
    }

    @Override    public void onCreate() {
        Log.i("AlarmReceiver", "onCreate()");    }

    @Override    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("LocalService", "Received start id " + startId + ": " + intent);
        // If this service was started by out AlarmTask intent then we want to show our notification        if (intent.getBooleanExtra("Alarm", false)) {
            showNotification();        }

        // We don't care if this service is stopped as we have already delivered our notification        return START_NOT_STICKY;    }

    @Override    public IBinder onBind(Intent intent) {
        return mBinder;    }

    // This is the object that receives interactions from clients    private final IBinder mBinder = new ServiceBinder();
    /**     * Creates a notification and shows it in the OS drag-down status bar     */    private void showNotification() {

        NotificationManager mNotificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
        Intent intent = new Intent(this, FirstScreen.class);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this);
        mBuilder.setSmallIcon(R.drawable.ic_launcher)
                .setContentTitle("Title")
                .setAutoCancel(true)
                .setContentText("Text");
        mBuilder.setContentIntent(contentIntent);
        mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
        // Stop the service when we are finished
        stopSelf();    }
}