Disable Screen overlay for my app or I don't want to show other apps popups in my app like Facebook Messenger popup

Question

I want to disable popups over my custom android application. How can I do it pragmatically? I am making an application like Kiosk mode so I don't want other apps popups over my application. I am using Screen pinning mode but its shows other apps popups. Sorry for my bad English.

Answer 1

Any app which uses permission "android.permission.SYSTEM_ALERT_WINDOW" can draw an overlay on top of other apps. So even if screen pinning mode is on, overlay or popup can appear but another app cannot be opened.