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片段中的 Android ListView ArrayAdapter 不起作用

[英]Android ListView ArrayAdapter in fragment not work

I've been trying to understand why it doesn't work for a while, I've followed several guides and the procedure is always the same.我一直试图理解为什么它有一段时间不起作用,我遵循了几个指南,程序总是一样的。

The ArrayAdapter part returns a Context-related error: ArrayAdapter 部分返回与上下文相关的错误:

Screenshot with ArrayAdapter Error ArrayAdapter 错误的屏幕截图

I thought the problem may be related to the fragment but I was unable to solve it.我认为问题可能与片段有关,但我无法解决。 My goal is to try to add the array to the listview我的目标是尝试将数组添加到列表视图

menuFragment.xml menuFragment.xml

<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=".MenuFragment">


    <ListView
        android:id="@+id/list_menu"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    />
</LinearLayout>

MenuFragment.kt菜单片段.kt

class MenuFragment : Fragment() {


    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?

    ): View? {

        val view: View = inflater.inflate(R.layout.fragment_menu, container, false)

        val arrayAdapter: ArrayAdapter<*>
        val menuItems = arrayOf("wine", "beer", "pizza", "steak", "chicken")

        var mListView = list_menu

        arrayAdapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, menuItems)

        mListView.adapter = arrayAdapter


        return view

    }}

this refers a Fragment , you should use a Context in ArrayAdapter constructor. this指的是Fragment ,您应该在 ArrayAdapter 构造函数中使用Context

You can get the Context from getActivity() or passing it to MenuFragment您可以从getActivity()获取 Context 或将其传递给MenuFragment

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