android - IllegalArgumentException: savedInstanceState Specified as Non-Null is Null

Question

I am getting a strange error when I start my MainActivity:

06-16 16:01:05.193 2083-2083/? E/AndroidRuntime: FATAL EXCEPTION: main
        Process: com.android.example.github, PID: 2083
        java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.example.github/com.android.example.github.ui.MainActivity}: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter savedInstanceState
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2666)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727)
            at android.app.ActivityThread.-wrap12(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:154)
            at android.app.ActivityThread.main(ActivityThread.java:6121)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
          Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter savedInstanceState
            at com.android.example.github.injection.AppInjector$init$1.onActivityCreated(AppInjector.kt)
            at android.app.Application.dispatchActivityCreated(Application.java:197)
            at android.app.Activity.onCreate(Activity.java:961)
            at android.support.v4.app.BaseFragmentActivityGingerbread.onCreate(BaseFragmentActivityGingerbread.java:54)
            at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:319)
            at com.android.example.github.ui.MainActivity.onCreate(MainActivity.kt:20)
            at android.app.Activity.performCreate(Activity.java:6682)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2619)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727)?
            at android.app.ActivityThread.-wrap12(ActivityThread.java)?
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478)?
            at android.os.Handler.dispatchMessage(Handler.java:102)?
            at android.os.Looper.loop(Looper.java:154)?
            at android.app.ActivityThread.main(ActivityThread.java:6121)?
            at java.lang.reflect.Method.invoke(Native Method)?
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)?
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)?

This is my MainActivity class:

class MainActivity : LifecycleActivity(), HasSupportFragmentInjector {

    lateinit var dispatchingAndroidInjector: DispatchingAndroidInjector<Fragment>
        @Inject set

    lateinit var navigationController: NavigationController

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.main_activity)

        if (savedInstanceState == null) {
            navigationController.navigateToSearch()
        }
    }

    override fun supportFragmentInjector(): AndroidInjector<Fragment> {
        return dispatchingAndroidInjector
    }

}

The error states that the parameter savedInstanceState is null, when it is specified as non-null; but it is nullable (savedInstanceState: Bundle?) and the onCreate() method is marked as @Nullable in the source.

I have not come across this error in any of my other Kotlin projects. I am using Kotlin version 1.1.2-5; and had the same error with 1.1.2-3.

Answer 1

I had the exact same problem, you have to make nullable types here:

override fun onCreatePreferences(bundle: Bundle?, s: String?) {}