"android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application"

Question

I want show AlertDialog when i will send mail. But I have this Exception. WindowManager$BadTokenException what does it mean?

pDialog = ProgressDialog.show(MainActivity.sContext , "", "Sending Mail...", true);

    RetreiveFeedTask task = new RetreiveFeedTask();

Post logcat error as well as more code ... to understand your problm — koutuk, Jun 19 '15 at 12:20
what is MainActivity.sContext? if it is getApplicationContext(), change it to "this" or "MainActivity.this" — Amrit Pal Singh, Jun 19 '15 at 12:34

score 1 · Accepted Answer · answered Jun 19 '15 at 12:24

As far as I can understand your question the problem is that you are trying to update the UI on a different thread, and that isn't possible. The RetreiveFeedTask is probably executing on a different thread.

You have to run your code to dispay an alertdialog on the UI thread. You can do that by pasting the following code in your own code and add the code in the body of the method run().

activity.runOnUiThread(new Runnable() {
  public void run() {

  }
}

score 0 · Answer 2 · answered Jun 19 '15 at 12:29

This is because your Activity is closed and you are trying to do some work with your ProgressDialog

You can handle it by using onPause method

For example

protected void onPause() {

        super.onPause();
         if ((pDialog != null) && pDialog.isShowing())
             pDialog.dismiss();
         pDialog = null;
    }

score 0 · Answer 3 · edited May 23 '17 at 11:51

0

BadTokenException: You cannot display an Dialog through a Context that is not an Activity.

Use:

ProgressDialog.show(MainActivity.this, "", "Sending Mail...", true);

See: BadTokenException

edited May 23 '17 at 11:51

Community

1
1

answered Jun 19 '15 at 12:31

shkschneider

17,833
13
59
112

No problem. If that solved your issue, please accept that answer :) – shkschneider Jun 19 '15 at 13:04

"android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application"

3 Answers3