Bad window token, you cannot show a dialog before an Activity is created or after it's hidden

Question

I am using an AppIntro library in my app.

It has 3 slides. I want to ask the user something when the third slide is shown. To achieve that I am using material dialogs b

Answer 1

This can be resolved by confirming that current Activity hasWindowFocus because when you get the context in the fragment, instead of exactly which Activity it is, it might not have windowFocus :

if (((Activity) mContext).hasWindowFocus()) {
        mDialog.show();
}