check the error messages:

OSError: [WinError adb shell am instrument -w -r -e debug false -e class com.github.uiautomator.stub.Stub com.github.uiautomator.test/android.support.test.runner.AndroidJUnitRunner] uiautomator2.GatewayError(gateway error, time used 0.0s): 'https://github.com/openatx/uiautomator2/wiki/Common-issues'

It is said that app-uiautomator.apk or app-uiautomator-test.apk not installed. but if you use the following command:

 python -m uiautomator2 init

There are no errors, and you can see the successful installation of the above two apps, so the problem is not the failure of uiautomator app installation.

Solution:

Turn on the settings of Xiaomi mobile phone – turn on developer options – turn on USB debugging – turn on USB installation – turn on USB debugging (security settings) – turn on the application that passes USB verification (default on) – turn on wireless display authentication (optional). The key option is not to enable MIUI optimization. After operating the above settings, execute python -m uiautomator2 init (no error), and then you can execute the relevant scripts