Fix Android Build for Ionic 4 App

I have an Ionic 4 app that uses Cordova for building the Android version. Recently, I have been facing challenges with building the app due to version mismatches among Java, Gradle, and the Android SDK. I need an experienced developer who can troubleshoot these incompatibilities, rectify the issues and get the Android build working again.

Ideal Skills:
- Proficiency in Cordova and Ionic 4
- Strong knowledge in Java, Gradle, and Android SDK
- Experience in resolving version mismatch issues
- Ability to troubleshoot and fix build errors

What you need to do:
- Identify and rectify version mismatches
- Ensure compatibility between Java, Gradle, and Android SDK
- Successfully build the Android version of the app

I have recently updated Java, Gradle, and the Android SDK, which seems to have triggered the build issues. Your expertise in this area will be invaluable in getting my project back on track.