[android-developers] Avoid android taking screenshot/snapshot of activity while going in background

In 3.0+ and 4.0+,
When user switches applications
Android takes a screenshot of the current activity before moving the
application in background. If you press the task-switcher button, you
can see the snapshot of your app.
I want to avoid that android takes snapshot of my activity as it has
sensitive data in it.
I have already tried flag "excludeFromRecents" but it doesnot work.

Any help is appreciated.

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