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On Android 12, if I create an simple app with WindowManager.LayoutParams.FLAG_SECURE

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        window.setFlags(
            WindowManager.LayoutParams.FLAG_SECURE,
            WindowManager.LayoutParams.FLAG_SECURE
        setContentView(R.layout.activity_main)
the window does not secure if I try to switch apps
however, if I switch back, the window does secure
In both cases, switching to or from, the window secures on Android 11, but not on Android 12. Any idea why?
As of Android version 12, it was the desired behavior. additionally, you can check the Google Issue Tracker.
https://issuetracker.google.com/issues/237190495
Instead of onPause and onResume, we can use onWindowFocusChanged(boolean).when the activity does not have focus we can enable FLAG_SECURE when the app does regain focus we can clear FLAG_SECURE
Easy approach using View#onWindowFocusChanged(boolean) on your Activity:
@Override
public void onWindowFocusChanged(boolean hasFocus) {
  super.onWindowFocusChanged(hasFocus);
  if (hasFocus) {
    // allow screenshots when activity is focused
    getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE);
  } else {
    // hide information (blank view) on app switcher
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
        
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