Screen Lock

Screen Lock is the listing name for ZukuLock, a single-purpose app by Vietnamese developer Đỗ Ngọc Minh Tiến. Each tap starts its short-lived SleepService; that service connects to Shizuku, runs Android’s input keyevent 26 command and stops itself. The command behaves like one press of the physical power button. It was created for phones such as Google Pixels that do not offer a built-in double-tap-to-lock gesture.

How to use it

Install and start Shizuku, then grant Screen Lock access when Shizuku asks. The first tap that opens the permission prompt does not also lock the screen, so tap the icon again after approval. If Shizuku is not running, the app shows a message instead. With a launcher that can open an app from a gesture, you can assign the icon to double-tap on the home screen.

This route avoids the Accessibility service used by many lock-button apps. That can be useful when a banking app objects to enabled accessibility services, but it is not a promise that every banking app will accept the setup: each bank decides what it checks, and Shizuku or wireless debugging may itself matter to some security policies.

The command is a screen toggle, not a separate lock mechanism. Android still controls when credentials are required, Smart Lock or Extend Unlock, biometrics and the lock-after-screen-timeout delay. Screen Lock cannot override those settings and does not replace the system lock screen.

Privacy and permissions

The measured APK declares one permission: Shizuku’s API permission. It has no internet, storage, Accessibility, device-admin or overlay permission, no native libraries and no tracker SDKs in our scan. It has no visible setup screen. Each icon tap starts its own internal service only long enough to connect, send the command and stop; the service is not left running in the background.

About this file

• This is the developer-signed version 1.0.1 distributed through IzzyOnDroid. The APK is 0.7 MB and runs on Android 7.0 or later.
• Version 1.0 used a different signing key. Android will reject 1.0.1 as an update to that copy; uninstall 1.0, install this one and approve its Shizuku access again.
• The source and app are under the MIT licence. The absence of screenshots is deliberate: the app’s only user-facing action is its launcher icon and the immediate screen-off request.

Shizuku API. Uses the Shizuku API, so it can do ADB-level work without root once Shizuku is running. (rikka.shizuku.Shizuku$$ExternalSyntheticLambda0)