Symptoms

1. When opening the project which was created in the Android studio, the program tells that there are dependencies with AndroidX.
2. After project migration, Android Studio responds "No Usages Found in the Project".

Cause

The issue is in the version code of the Gradle.

Solution

If it`s not the same, please change it, for example as below:

classpath 'com.android.tools.build:gradle:3.2.1'
to
classpath 'com.android.tools.build:gradle:3.3.1'