lateinit属性列表尚未初始化

Question

我在项目中使用了retrofit、rxjava和recyclerview，立即出现问题。这是MainActivity.kt 文件：

private lateinit var recyclerView: RecyclerView
    private lateinit var list: List<Data>
    private lateinit var binding: ActivityMainBinding
    private lateinit var adapter: RecyclerviewAdapter
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding= ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
        binding.recyclerview.setHasFixedSize(true)
        adapter=RecyclerviewAdapter(list)
        binding.recyclerview.adapter= adapter
        binding.recyclerview.layoutManager=LinearLayoutManager(this)

    }

我正在尝试访问这些数据：

data class Data(var date : Date?, var temperatureC: Int?,var temperatureF:Int?, var summary:String?){

}

错误在这里：

FATAL EXCEPTION: main
                                                                                                Process: com.example.httpclient, PID: 26086
                                                                                                java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.httpclient/view.MainActivity}: kotlin.UninitializedPropertyAccessException: lateinit property list has not been initialized
                                                                                                    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3645)
                                                                                                    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3782)
                                                                                                    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101)
                                                                                                    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
                                                                                                    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
                                                                                                    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2307)
                                                                                                    at android.os.Handler.dispatchMessage(Handler.java:106)
                                                                                                    at android.os.Looper.loopOnce(Looper.java:201)
                                                                                                    at android.os.Looper.loop(Looper.java:288)
                                                                                                    at android.app.ActivityThread.main(ActivityThread.java:7872)
                                                                                                    at java.lang.reflect.Method.invoke(Native Method)
                                                                                                    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
                                                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
                                                                                                Caused by: kotlin.UninitializedPropertyAccessException: lateinit property list has not been initialized
                                                                                                    at view.MainActivity.onCreate(MainActivity.kt:24)
                                                                                                    at android.app.Activity.performCreate(Activity.java:8305)
                                                                                                    at android.app.Activity.performCreate(Activity.java:8284)
                                                                                                    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1417)
                                                                                                    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3626)

我希望看到它是如何工作的。

Answer 1

您在 onCreate() 方法中在哪里初始化列表属性。 你必须像这样初始化它：

list = List<Data>?

然后传递给

adapter=RecyclerviewAdapter(list)