Hide/change the application screen picture from Recent Apps Android 4.x -

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i need hide application screen list of running applications when click recent apps button in android 4.x. data application contains leak sensitive information if have application running in background. still application shown in recent apps, not screenshot.

how do this?

to exclude application recent apps should following:

on activity on manifest android:excludefromrecents="true"

and can disable thumbnail on activity containing sensitive data adding flag_secure window:

getwindow().addflags(windowmanager.layoutparams.flag_secure);

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