android - kotlin 'onCreate' overrides nothing

Question

I am using component development, in my common module BaseActivity.kt and BaseFragment.kt. The following problems occur when other modules inherit them

> D:AndroidOneDailymodule_mainsrcmainjavacomocomainMainActivity.kt
> Error:(7, 24) Unresolved reference: base 
> Error:(9, 22) Unresolved reference: BaseActivity 
> Error:(21, 5) 'onCreate' overrides nothing
> Error:(17, 5) 'getLayoutRes' overrides nothing 
> Error:(22, 15) Unresolved reference: onCreate 
> Error:(27, 22) Unresolved reference: findViewById 
> Error:(42, 34) Unresolved reference: supportFragmentManager
> D:AndroidOneDailymodule_mainsrcmainjavacomocomainTimelineFragment.kt
> Error:(7, 24) Unresolved reference: base 
> Error:(10, 5) 'getLayoutRes' overrides nothing 
> Error:(9, 26) Unresolved reference: BaseFragment
> Error:(14, 5) 'onCreateView' overrides nothing 
> Error:(15, 22) Unresolved reference: onCreateView

BaseActivity.kt:

abstract class BaseActivity : AppCompatActivity() {  
    init {  
        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true)  
    }  
    abstract fun getLayoutRes(): Int  
    override fun onCreate(savedInstanceState: Bundle?) {  
        super.onCreate(savedInstanceState)  
        setContentView(getLayoutRes())  
    }  
}  

MainActivity.kt

class MainActivity : BaseActivity() {

    private lateinit var mBottomNav: BottomNavigationView

    private var mFragment1 = TimelineFragment() as Fragment
    private var mFragment2 = TimelineFragment() as Fragment
    private var mFragment3 = TimelineFragment() as Fragment

    override fun getLayoutRes(): Int {
        return R.layout.activity_main
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

    }
}

question from:https://stackoverflow.com/questions/47049471/kotlin-oncreate-overrides-nothing

Answer 1

It seems some functions have changed in the last update, just remove the '?' from the Bundle

Like this:

override fun onCreate(savedInstanceState: Bundle) {
    super.onCreate(savedInstanceState)
}