How to disable the display of information (pictures) of the application in the multitasking menu?

Question

Android

Actually, how to implement so that when the application is minimized (or when switching to multitasking mode), the multitasking menu does not display a screenshot of the screen, but just a white sheet?
For example, the way it is implemented in 1Password.

spoiler

Answer 1

try like this

getWindow( ).setFlags( LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE );