How do I add PDFTron to an app that uses AndroidX?

If you are integrating PDFTron using Gradle and would like to use AndroidX in your app, you can enable the following flags in your app's gradle.properties file to tell Android Studio's build system to migrate the PDFTron Android libraries to use AndroidX:

# Automatically migrate third-party libraries to use AndroidX
android.useAndroidX=true
android.enableJetifier=true