Dialog throwing "Unable to add window — token null is not for an application” with getApplication() as context

Question

My Activity is trying to create an AlertDialog which requires a Context as a parameter. This works as expected if I use:

AlertDialog.Builder builder = new Al         


        

Answer 1

Guys I got a simple cheat sheet. create a file give it any name then in it write this code

fun Context.alertdialog(context: Context, msg: String, icon: Drawable, title:String){
    val alertDialog = AlertDialog.Builder(context)
    alertDialog.setIcon(icon)
        .setTitle(title)
        .setMessage(msg)
    alertDialog.show()
}

now when you need to show an alert dialog only use this method anywhere

requireActivity().alertdialog(requireContext(), resources.getString(R.string.pass_title),
                resources.getDrawable(R.drawable.pass_ic_name), "title")

Goodluck for Kotlin

Answer 2

Or another possibility is to create Dialog as follow:

final Dialog dialog = new Dialog(new ContextThemeWrapper(
            this, R.style.MyThemeDialog));

Answer 3

In my case work:

this.getContext();

Answer 4

If you are using a fragment and using AlertDialog/Toast message then use getActivity() in the context parameter.

like this

ProgressDialog pdialog;
pdialog = new ProgressDialog(getActivity());
pdialog.setCancelable(true);
pdialog.setMessage("Loading ....");
pdialog.show();

Answer 5

I think it may happen as well if you are trying to show a dialog from a thread which is not the main UI thread.

Use runOnUiThread() in that case.

Answer 6

Here is how I resolved same error for my application:
Adding the following line after creating the dialog:

dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);  

You will not need to acquire a context. This is particularly useful if you are popping up another dialog over current popped up dialog. Or when it's not convenient to get a context.

Hope this can help you with your app development.

David