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

Question

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?

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Answer 1

In my case I was trying to create my dialog like this:

new Dialog(getApplicationContext());

So I had to change for:

new Dialog(this);

And it works fine for me ;)

Answer 2

I got this exception, when I tried to open Progress Dialog under Cordova Plugin by using below two cases,

1. new ProgressDialog(this.cordova.getActivity().getParent());

2. new ProgressDialog(this.cordova.getActivity().getApplicationContext());

Later changed like this,

new ProgressDialog(this.cordova.getActivity());

Its working fine for me.

Answer 3

Hello there if you are using adapter there might be a chance.
All you need to know when you used any dialog in adapter,getContext(),context or activity won't work sometime.

Here is the trick I used v.getRootView().getContext() where v is the view object you are referencing.
Eg.

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                new DatePickerDialog(v.getRootView().getContext(), date, myCalendar
                        .get(Calendar.YEAR), myCalendar.get(Calendar.MONTH),
                        myCalendar.get(Calendar.DAY_OF_MONTH)).show();
            }
        });  
If you are getting this problem because of alert dialog.
Refer [here][1] But it is same concept.


  [1]: https://stackoverflow.com/questions/6367771/displaying-alertdialog-inside-a-custom-listadapter-class

Answer 4

Try getParent() at the argument place of context like new AlertDialog.Builder(getParent()); Hope it will work, it worked for me.

Answer 5

I tried with this in the context field:

this.getActivity().getParent()

and it works fine for me. This was from a class which extends from "Fragment":

public class filtro extends Fragment{...

Answer 6

I solved this error by add below user-permission in AndroidManifest.xml

 <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

Also, Initialize Alert dialog with Activity Name:

AlertDialog.Builder builder = new AlertDialog.Builder(YourActivity.this);

For More Details, visit==> How to create Alert Dialog in Android