Android builds break when updating to android gradle plugin 7

[p-fischer]

Android gradle plugin version 7 requires JDK 11.

This implies that one needs to switch from the deprecated SDK tools to the current command line tools.
Both tool packages include an sdkmanagerbinary but the deprecated version of sdkmanager depends on java packages javax.xml and therefore is incompatible with JDK 9+.

There is an older related PR #992

[phansch]

We are also running into this now as we're upgrading to the latest Android/Gradle version