Can't programmatically get resource from another module

Question

I have an android project with several gradle modules. Dependencies beetween modules look like this:
app <-- coremodule <-- featuremodule

There are a resources in coremodule (strings and colors).

When I use them in layout from featuremodule everything is OK, they are avaliable and work as expected. But when I try to get them programmaticully in Activity from featuremodule I get an exception: Unresolved reference: R

So android:text="@string/res_from_core_module" works and myTextView.setText(R.string.res_from_core_module) doesn't work.

Have anyone ideas why it happens and how to solve this?

Answer 1

The reason for such behavior was adding 'coremodule' dependency with compileOnly.

build.gradle for app module looked like:

dependencies {
    ...
    compileOnly project(path: ':coremodule')
    ...
}

if change compileOnly with implementation (or api) everything is OK

dependencies {
    ...
    implementation project(path: ':coremodule')
    ...
}