TapTap Lock: Double-tap to lock the screen

"TapTap Lock" is an app using widget to lock the screen and keep the fingerprint-unlocking function.
Appearance: Make the image of the widget fully transparent to display the wallpaper completely, so you won’t feel the existence of the widget.
Operation: One tap or Double Tap are available in the widget. Just touch the widget to lock the screen, and you can still use fingerprint-unlocking function.
An easy-to-use screen lock widget for you.
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"TapTap Lock" needs to run on Android P (9.0) or higher.