ShizuIsolation

Shizu Isolation is a small Android app that lets you lock your phone's USB port to charging-only mode with a single tap. When you plug your phone into a computer or public charging station, that connection can potentially allow the other device to access your files. Locking the USB port to charging-only blocks that data access while still letting the phone charge.

The app works without root access, which is notable because controlling USB mode normally requires elevated system permissions. It achieves this through a separate tool called Shizuku, which provides a way to run privileged commands on Android without rooting the device. Shizuku must already be installed and running on your phone for this app to work.

The interface has two main actions: one to switch the USB port into charging-only mode, and one to restore it to normal file-transfer mode. The app runs no background services, so it does not consume battery when you are not actively using it.

To install, you download the APK file from the releases page and install it manually, since it is not distributed through the Play Store. This requires enabling the option to install apps from unknown sources in your Android settings.

The project requires Android 10 or newer and depends on Shizuku being set up beforehand. The source code and all assets are under a restrictive copyright with no open-source license, meaning the code cannot be reused or modified without permission from the author.