Cannot secure window on Android 12 with WindowManager.LayoutParams.FLAG_SECURE

Question

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?

Check this link https://stackoverflow.com/questions/28606689/how-to-prevent-screen-capture-in-android Hope this helps. — rasfarrf5, May 05 '22 at 08:17
Also have a look at my question too. https://stackoverflow.com/q/76651691/4134215 — Taimoor Khan, Jul 16 '23 at 20:07

score 3 · Answer 1 · answered Dec 16 '22 at 10:15

3

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);
  }
}

answered Dec 16 '22 at 10:15

Aure77

3,034
7
33
53

1

If Any Modal components render than hasFocus returns false. but actually App is in foreground only – Manikanta Apr 10 '23 at 10:47
@Aure77 Also see my question https://stackoverflow.com/q/76651691/4134215 – Taimoor Khan Jul 16 '23 at 20:07

AmarDurai · Answer 2 · 2022-11-14T07:16:20.973

2

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

edited Nov 14 '22 at 07:16

answered Oct 31 '22 at 14:01

AmarDurai

91
1
8

score 0 · Answer 3 · answered May 24 '23 at 08:58

A new flag is added in Android 13 to prevent the app preview from appearing in the Recent Apps. https://developer.android.com/reference/android/app/Activity#setRecentsScreenshotEnabled(boolean) Although this is not for Android 12, I am sharing here for people who are interested in this feature.

Cannot secure window on Android 12 with WindowManager.LayoutParams.FLAG_SECURE

3 Answers3