Use AndroidX in a new project
gradle.properties file:
android.useAndroidX=true android.enableJetifier=true
Migrate an existing project using Android Studio
select Refactor > Migrate to AndroidX from the menu bar
References
https://developer.android.com/topic/libraries/support-library/androidx-overview?utm_source=android-studio&utm_medium=studio-assistant#migration
https://developer.android.com/topic/libraries/support-library/refactor#migrate