我找不到如何使用 kotlin 使用片段。我在 onCreateView 方法中遇到错误，请帮助我。
ListaFragment.kt：
class ListaFragment : Fragment() {
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle): View? {
val view = inflater.inflate(R.layout.fragment_lista, container, false)
return view
}
}
片段列表.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:text="Hello"/>
</LinearLayout>
MainActivity.kt：
class MainActivity : AppCompatActivity() {
private var listaFragment: ListaFragment? = null
override fun onCreate(savedState: Bundle?) {
super.onCreate(savedState) //cual es la diferencia con savedInstanceState
setContentView(R.layout.activity_main)
listaFragment = Fragment.instantiate(this@MainActivity,
ListaFragment::class.java!!.getName()) as ListaFragment
fragmentManager.beginTransaction().replace(R.id.flLista, listaFragment).commit()
}
}
活动主.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.harol.appfinalandroid.MainActivity">
<FrameLayout
android:id="@+id/flLista"
android:layout_width="match_parent"
android:layout_height="match_parent"></FrameLayout>
</LinearLayout>
我没有语法错误，当我打开片段时应用程序停止
错误：
Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter savedInstanceState
at com.example.harol.appfinalandroid.ListaFragment.onCreateView(ListaFragment.kt:0)