Hi everyone! :wave: I'm facing an interesting iss...

# multiplatform

[FunnySaltyFish]

Hi everyone! 👋

I'm facing an interesting issue with Kotlin Multiplatform (Android + JVM Destop) and AppCompatActivity in Kotlin 2.0.21. Here's my setup:

// commonMain
expect abstract class KMPActivityexpect open class BaseActivity() : KMPActivity
expect class LoginActivity: BaseActivity// androidMain
actual abstract class KMPActivity: AppCompatActivity() // This causes compilation erroractual open class BaseActivity : KMPActivity()
actual class LoginActivity : BaseActivity()

The compiler error is:

'actual class LoginActivity : BaseActivity' has no corresponding members for expected class members:
  field mFragments: FragmentController!
  The following declaration is incompatible because actualization to Java field is prohibited:
    field mFragments: FragmentController!
  field mFragmentLifecycleRegistry: LifecycleRegistry!
  The following declaration is incompatible because actualization to Java field is prohibited:
    field mFragmentLifecycleRegistry: LifecycleRegistry!
  field mCreated: Boolean
  The following declaration is incompatible because actualization to Java field is prohibited:
    field mCreated: Boolean
  field mResumed: Boolean
  The following declaration is incompatible because actualization to Java field is prohibited:
    field mResumed: Boolean
  field mStopped: Boolean
  The following declaration is incompatible because actualization to Java field is prohibited:
    field mStopped: Boolean

Interestingly, if I change AppCompatActivity to ComponentActivity, it compiles fine! 🤔

I found a related issue in YouTrack: Here

Has anyone found a clean way to use AppCompatActivity in a KMP project with Kotlin 2.0+? I need the AppCompat features but can't figure out how to properly actualize the Activity class. Any suggestions or workarounds would be greatly appreciated! 🙏

Full code: Code