Samsung devices does not close app drawer after CLOSE_SYSTEM_DIALOGS broadcast

Question

I'm developing a simple Kiosk Mode application for Android 6.0. I have everything working on devices from Xiaomi, HTC, Lenovo, etc. but I can't get one feature working on any Samsung device.

The feature is automatic closing of every system system dialog using

Intent closeDialog = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
sendBroadcast(closeDialog);

This is broadcasted from a Service.

On my other, non-samsung devices, everything works and all system dialogs closes, but on any Samsung device (S5, S6 edge, ...) this broadcast gets ignored and for example the app drawer stays opened.

I've observed that even using ADB to broadcast this intent, app drawer stays opened, but for example the shutdown device dialog gets closed if I broadcast this from adb.

Please note that this is not malicious action in context of this software, this is for client, that requires this feature and it is completely solicited.

I've done research on Samsung Knox, but we would have to obtain their license for using the Knox Standard SDK and that is not something that is in the scope of this project.

So my question is: Do you have any idea how to make this work (closing the app drawer with ACTION_CLOSE_SYSTEM_DIALOGS intent) on samsung devices with Knox installed?

Thanks.

Answer 1

Try doing it like this :

 @Override
public void onWindowFocusChanged(boolean focus) {
        super.onWindowFocusChanged(focus);

        if (! focus) {
            Intent close= new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
            sendBroadcast(close);
        }
    }