'onRequestPermissionsResult' overrides nothing

Question

I'm trying to implement a verfication on permission result for my Activity:

class MainActivity : FlutterActivity() {
   //...
   override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String?>?, grantResults: IntArray) {

But I get

MainActivity.kt: (325, 5): 'onRequestPermissionsResult' overrides nothing

According to https://developer.android.com/reference/androidx/core/app/ActivityCompat.OnRequestPermissionsResultCallback, activity extends this interface

Answer 1

Below is the signature of the onRequestPermissionsResult function of FlutterActivity that extends Activity. Note how the permissions parameter differs from your override declaration ?

public void onRequestPermissionsResult(int requestCode,
                                       @NonNull
                                       String[] permissions,
                                       @NonNull
                                       int[] grantResults)

As you can see the parameters are annotated @NonNull which means you can't use the nullable operator and override this as ..., permissions: Array<String?>?, ...