CODEWITHSUNDEEP
android
Co Koder
Co Koder

Reputation: 2221

Alarmmanager with pending Intent

The code snippet below.... 

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    ///////////Do something////////////////////////
    showtext.startScan();
    //SEt Alarm
    Intent intent = new Intent(this, TextReceiver.class);
    PendingIntent pi = PendingIntent.getBroadcast(this, 0, intent, 0);
    AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
    am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+9000, pi);}

And my Receiver :

TextReceiver extends BroadcastReceiver{

    public void onReceive(Context context, Intent intent) {
        ///Show text/////
    }
}

The thing is that when I run the program after 9sn, I am getting an error that "The app stopped unexpectedly". Why I get this error?

My goal is to show the text every 9sn. What is the correct usage of AlarmManager in the main activity
OR Should I set alarm in the BroadcastReceiver ? Which one does makes sense: am.setRepeating or am.set in terms of my goal?

**Edit: How can I change my alarm code to run in the Broadcast Receiver ? **

Upvotes: 4

Views: 16647

Answers (2)

ctate
ctate

Reputation: 1409

Never, ever use FLAG_CANCEL_CURRENT with PendingIntents that are set as alarms.

What happens is that you wind up canceling the validity of the PendingIntent currently held by the alarm manager, and this means that the alarm manager can no longer tell that any newly-set alarm matches that old PendingIntent. You wind up with the old (invalid) alarm still registered along with your new one. If you keep doing this you can wind up with hundreds (or more!) stale alarms registered in the system, none of which will actually do anything but which are taking up memory and CPU.

Upvotes: 3

Padma Kumar
Padma Kumar

Reputation: 20041

//try this

AlarmManager am=(AlarmManager)getApplicationContext getSystemService(Context.ALARM_SERVICE);

PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,  intent, PendingIntent.FLAG_CANCEL_CURRENT);

  am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),(9 * 1000), pendingIntent);

Upvotes: 8

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