In my project I have defined many strings inside a core module. After upgrading to gradle 8 I see that I need to reference R files exactly now.
E.g. if I define a string inside my core module and want to access it from my main module (the main module includes the core module of course) I see following behaviour:
Before
I could access strings (and all other resources) from the core module inside the main module via com.my.package.main.R and com.my.package.core.R
After
Now I can only access the strings from the exact module anymore so I need to use com.my.package.core.R inside my main module to access strings from the core module…
The same happens for attributes from com.google.android.material.R and androidx.appcompat…
Did I miss a migration step? Or should this really be like that?
I think this is a side effect of moving the package names from the AndroidManifest.xml file to the build.gradle.kts as the namespace value but I could not find such a behaviour change documented anywhere
>Solution :
With AGP 8 the default behaviour did change:
See the option android.nonTransitiveRClass in
https://developer.android.com/build/releases/gradle-plugin
android.nonTransitiveRClass
New default: true Old default: false
AGP 8.0 generates R classes for resources defined in the current module only.