WindowManager$BadTokenException unable to add window

Question

I am developing app for background videorecording ,thats why i used WindowManager,but it did not worked for me.gives following errors:

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Answer 1

Starting from marshmallow versions the permission approval is a little bit complex. So even after giving the above permission this issue is not resolved. Please see the following link.

Unable to add window android.view.ViewRoot$W@44da9bc0 -- permission denied for this window type