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]

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 APP_PACKAGES = arrayOf(
  // Choose one depending on your installation method:
  "uk.nktnet.webviewkiosk",   // GitHub, F-Droid, IzzyOnDroid, etc
  "com.nktnet.webview_kiosk", // Aurora Store, Google Play Store
)

val dpm = context.getSystemService(Context.DEVICE_POLICY_SERVICE) as DevicePolicyManager
val adminName = getComponentName(context)
dpm.setLockTaskPackages(adminName, APP_PACKAGES)

Docs:

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

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UPDATE - Dhizuku support

As of v0.24.35+, support for Dhizuku has been added.

For context, Dhizuku is

A tool that can share DeviceOwner permissions to other application.