IllegalArgumentException:savedInstanceState指定为Non-Null为Null

Question

我开始时遇到一个奇怪的错误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) 

这是我的MainActivity班级:

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
    }

}

savedInstanceState当指定为非null时,该错误指出该参数为null; 但它是nullable(savedInstanceState: Bundle?),并且该onCreate()方法@Nullable在源中标记为.

我在任何其他Kotlin项目中都没有遇到过这个错误.我正在使用Kotlin版本1.1.2-5; 与1.1.2-3有同样的错误.

Answer 1

我有完全相同的问题,你必须在这里制作可空类型:

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

Answer 2

问题出在AppInjector中.我像你一样使用谷歌GitHubBrowser示例并遇到了同样的错误.我将代码复制到我的项目中,让Android Studio将其转换为Kotlin.当它这样做时,没有正确指定savedInstanceState引起崩溃的参数的可为空性.只需将其设置为可选,如下面的代码,它将工作.

object AppInjector {
    fun init(app: App) {
        DaggerAppComponent.builder().application(app)
                .build().inject(app)
        app
                .registerActivityLifecycleCallbacks(object : Application.ActivityLifecycleCallbacks {
                    override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
                        handleActivity(activity)
                    }

                    override fun onActivityStarted(activity: Activity) {

                    }

                    override fun onActivityResumed(activity: Activity) {

                    }

                    override fun onActivityPaused(activity: Activity) {

                    }

                    override fun onActivityStopped(activity: Activity) {

                    }

                    override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {

                    }

                    override fun onActivityDestroyed(activity: Activity) {

                    }
                })
    }

    private fun handleActivity(activity: Activity) {
        if (activity is HasSupportFragmentInjector) {
            AndroidInjection.inject(activity)
        }
        (activity as? FragmentActivity)?.supportFragmentManager?.registerFragmentLifecycleCallbacks(
                object : FragmentManager.FragmentLifecycleCallbacks() {
                    override fun onFragmentCreated(fm: FragmentManager?, f: Fragment?,
                                                   savedInstanceState: Bundle?) {
                        if (f is Injectable) {
                            AndroidSupportInjection.inject(f)
                        }
                    }
                }, true)
    }
}

Answer 3

似乎问题不在于onCreate方法中.试着看com.android.example.github.injection.AppInjector$init$1.onActivityCreated(AppInjector.kt).我不知道它是否是一个生成的类,但它应该让你知道下一步该做什么.

Answer 4

您可以使用null-coalescing运算符?:。在savedInstanceState将被传递给super.onCreate方法，只有当它是@NonNull，否则，如果它是null一个空Bundle()将被传递。

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