This project uses AndroidX dependencies, but the ‘android.useAndroidX‘ property is not enabled.

解决方案：

打开 gradle.properties

输入代码：

android.useAndroidX=true
android.enableJetifier=true

点击 Sync now

Android Studio 4.0 ：This project uses AndroidX dependencies, but the 'android.useAndroidX' property is not enabled.