Add device admin capability for real kiosk mode

[lucs7]

Enable device admin function to fix app on screen without a way for users to exit it

[nktnet1]

I think device admin is deprecated:

• https://developer.android.com/work/device-admin

  

Also, I'm not sure if any features there would allow you to:

fix app on screen without a way for users to exit it

In Webview Kiosk v0.21.0, there's an option to set the app as the default Home app (aka default Launcher) - maybe there's some work that can be done here if you think App Pinning is insufficient, e.g.

• option to hide floating toolbar
• ability to set custom in-app password (allowing the lockscreen/device password can be removed)

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With Device Owner though, it might be possible, although it'll require a factory reset. I'm currently looking into implementing this and potentially pair it with Dhizuku and Shizuku.

[nktnet1]

@lucs7 feel free to track progress at #51 (currently a draft/incomplete PR).

[nktnet1]

Device Owner support is available as of v0.23.0.

Below is a quick demo, using Shizuku and Termux to set device owner:

app-device-owner-demo.webm

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If you have a different DPC that you control, you could also use allowlist Webview Kiosk:

val kioskPackage = "uk.nktnet.webviewkiosk"
val dpm = context.getSystemService(Context.DEVICE_POLICY_SERVICE) as DevicePolicyManager
val adminName = getComponentName(context)
dpm.setLockTaskPackages(adminName, arrayOf(kioskPackage))

Docs:

• https://developer.android.com/work/dpc/dedicated-devices/lock-task-mode#allowlist_apps