Android Question SYSTEM_ALERT_WINDOW PERMISSION

[Peppe B]

Why does not the overlay work on android 8? API 26

 

[Semen Matusovskiy]

I don't see where you ask permission.
Take a look https://www.b4x.com/android/forum/threads/draw-on-top-of-other-apps-permission.90513/#content

 

[Peppe B]

I don't see where you ask permission.
Take a look https://www.b4x.com/android/forum/threads/draw-on-top-of-other-apps-permission.90513/#content

The permission has already been accepted ... it is already working, but API 26 does not work

 

[Semen Matusovskiy]

Take a look https://www.b4x.com/android/forum/attachments/test-zip.72173/
This app creates small panel in the center of the screen (and you can move it)
I don't see problems in API 26 emulator, and in smartphone (API 27) also.

 

[DonManfred]

Note: If the app targets API level 23 or higher, the app user must explicitly grant this permission to the app through a permission management screen. The app requests the user's approval by sending an intent with action Settings.ACTION_MANAGE_OVERLAY_PERMISSION. The app can check whether it has this authorization by calling Settings.canDrawOverlays().

Edit to add: The zip posted by @Semen Matusovskiy does support calling the permissionscreen.

 

[Peppe B]

Permissions are not a problem.
But what happens is that on android 8 does not go up the same overlay screen allowing permission

 

[Semen Matusovskiy]

Where ? There are no problems in emulator ("clean" Android release).

Do you talk about your native smartphone ?
With custom firmwares all is possible. Many manufactures add settings for "security" reasons. Check phone settings.

BTW, SYSTEM_ALERT_WINDOW is really highly dangerous. For example, allows to create fake web pages over real and to steal passwords etc.

Documentation talks

Very few apps should use this permission; these windows are intended for system-level interaction with the user.