While building the runtime with a custom NDK version I noticed it never actually took effect. It comes down to this in test-app/runtime/build.gradle:

if (hasNdkVersion) {
    ndkVersion ndkVersion
}

This was added in cbd0ab1 to forward a -PndkVersion property into the android DSL. The catch is that inside the android {} block Groovy resolves names against the extension first, so the ndkVersion argument hits the extension's own getter, which is still empty there, and the line just assigns that empty value back to itself. The project property is never read. The else branch only works because defaultNdkVersion isn't a property on the extension, so it falls through to script scope.

Reading it explicitly with project.ndkVersion fixes it. Easy to check: pass -PndkVersion=<something> and android.ndkVersion comes out empty before this change and holds the value after. It usually goes unnoticed because most builds take the else branch, and an empty ndkVersion just makes AGP fall back to a default NDK rather than failing.

Summary by CodeRabbit

• Chores
  • Updated Android NDK version configuration in the build system to use Gradle properties for improved build configuration management.