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Calendar calendar = Calendar.getInstance(); 
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 15); 
 
Intent intent = new Intent(this,AlarmBroadcastReceiver.class);
PendingIntent sender = PendingIntent.getBroadcast(this,0,intent,0);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
 
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);
Toast.makeText(this, "Alarm Start!", Toast.LENGTH_SHORT).show();

Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); calendar.add(Calendar.SECOND, 15); Intent intent = new Intent(this,AlarmBroadcastReceiver.class); PendingIntent sender = PendingIntent.getBroadcast(this,0,intent,0); AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender); Toast.makeText(this, "Alarm Start!", Toast.LENGTH_SHORT).show();

public class AlarmBroadcastReceiver extends BroadcastReceiver 
{
 
	/* (non-Javadoc)
	 * @see android.content.BroadcastReceiver#onReceive(android.content.Context, android.content.Intent)
	 */
	@Override
	public void onReceive(Context context, Intent intent) 
	{
		NotificationManager manager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
 
		Notification notification = new Notification(R.drawable.icon,context.getString(R.string.app_name),System.currentTimeMillis());
 
		Intent _intent = new Intent(context.getApplicationContext(),MainActivity.class);
		PendingIntent pending = PendingIntent.getActivity(context, 0, _intent, 0);
 
		notification.setLatestEventInfo(context.getApplicationContext(),"通知タイトル","通知説明",pending);
		manager.notify(1, notification);
		Toast.makeText(context, "Alarm Received!", Toast.LENGTH_SHORT).show(); 
	}
}

public class AlarmBroadcastReceiver extends BroadcastReceiver { /* (non-Javadoc) * @see android.content.BroadcastReceiver#onReceive(android.content.Context, android.content.Intent) */ @Override public void onReceive(Context context, Intent intent) { NotificationManager manager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE); Notification notification = new Notification(R.drawable.icon,context.getString(R.string.app_name),System.currentTimeMillis()); Intent _intent = new Intent(context.getApplicationContext(),MainActivity.class); PendingIntent pending = PendingIntent.getActivity(context, 0, _intent, 0); notification.setLatestEventInfo(context.getApplicationContext(),"通知タイトル","通知説明",pending); manager.notify(1, notification); Toast.makeText(context, "Alarm Received!", Toast.LENGTH_SHORT).show(); } }

        <receiver android:name=".AlarmBroadcastReceiver" android:process=":remote" />
        <service android:name="NotificationChangeService" />

<receiver android:name=".AlarmBroadcastReceiver" android:process=":remote" /> <service android:name="NotificationChangeService" />