Why unnecessary messages appear in the Android notification bar and then disappear

Question

I use BroadCastReceiver , where I accept the BOOT_COMPLETED action. after receiving this broadcast, AlarmManager installed, and this AlarmManager triggers a notification: Code for the broadcast receiver:

 package pit.opensource.events; import java.util.Calendar; import android.app.AlarmManager; import android.app.PendingIntent; import android.app.Service; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.util.Log; public class BootReciver extends BroadcastReceiver { Context c; @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub // Intent i = new Intent(context,SetAlarmService.class); // context.startService(i); setAlarm(context); Log.d("Alarm","Boot Reciver"); } private void setAlarm(Context c){ Log.d("Alarm","Set alarm service--------------"); AlarmManager alarm = (AlarmManager)c.getSystemService(Service.ALARM_SERVICE); Calendar cal = Calendar.getInstance(); cal.setTimeInMillis(System.currentTimeMillis()); cal.clear(); cal.set(2012,5,11,5,11); Intent i = new Intent(c,ShowNotificationService.class); PendingIntent pendingIntent = PendingIntent.getService(c, 12345,i, 0); // alarm.set(AlarmManager.RTC_WAKEUP, dateNotif.getTime(), pendingIntent); //alarm.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pendingIntent); alarm.set(AlarmManager.RTC_WAKEUP, 5000, pendingIntent); Log.d("Alarm","Alarm is alreday set*****************"); } } 

ShowNotificationService Code:

 package pit.opensource.events; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.util.Log; import android.widget.Toast; public class ShowNotificationService extends Service { @Override public IBinder onBind(Intent intent) { // TODO Auto-generated method stub return null; } @Override public void onStart(Intent intent,int startId){ Toast.makeText(getApplicationContext(), "Alaraaaaaaaam", Toast.LENGTH_LONG).show(); Log.d("Alarm","Notification Service"); showNotification(); } private void showNotification(){ Intent i = new Intent(getApplicationContext(), DetailsActivity.class); Toast.makeText(getApplicationContext(), "Dowanlod finished!", Toast.LENGTH_LONG).show(); int notificationID = 1; NotificationManager nm = (NotificationManager) getSystemService(getApplicationContext().NOTIFICATION_SERVICE); Log.d("Notification","Notification is set--------------------"); PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext(), 0, i, 0); CharSequence tickerText = "Alaraaaaaaaam!"; long when = System.currentTimeMillis(); int icon = R.drawable.ic_launcher; Notification notification = new Notification(icon,tickerText,when); CharSequence contentTitle = "Alarm Alarm Alarm Alarm !!"; CharSequence contentText = "Please click here to display more details"; notification.setLatestEventInfo(getApplicationContext(), contentTitle, contentText, contentIntent); //---100ms delay, vibrate for 250ms, pause for 100 ms and // then vibrate for 500ms--- notification.vibrate = new long[] { 100, 250, 100, 500}; // Needs vibrate permissions nm.notify(notificationID, notification); } } 

Answer 1

The notification has disappeared because after the BroadcastReceiver finished, your application is already inactive. And notifications from inactive applications are automatically deleted.