Android 'Unable to add window -- token null is not for an application' exception

android android-dialog runtimeexception android-windowmanager
michael picture michael · Oct 28, 2011 · Viewed 135.3k times · Source

I get the following Android exception when I try to open a dialog. Can someone please help me understand what is going on and how can I fix this problem?

android.view.WindowManager$BadTokenException: 
  Unable to add window -- token null is not for an application
    at android.view.ViewRoot.setView(ViewRoot.java:509)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
    at android.app.Dialog.show(Dialog.java:241)

Answer

Peter Knego picture Peter Knego · Oct 28, 2011

I'm guessing - are you trying to create Dialog with an application context? Something like this:

new Dialog(getApplicationContext());

This is wrong. You need to use an Activity context.

You have to try like:

new Dialog(YourActivity.this);

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