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Infernal
Asked:2020-02-26 23:31:57 +0000 UTC2020-02-26 23:31:57 +0000 UTC

如何正确地将 ListView 插入 Fragment？

  • 772

如果你继承自 android.app.ListFragment 那么应用程序在启动时崩溃，如何正确地将 ListView 注入 Fragment？片段代码：

public class Fragment_AAC extends android.app.ListFragment {



    String[] base_AAC = getResources().getStringArray(R.array.base_AAC);

    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    private OnFragmentInteractionListener mListener;

    public Fragment_AAC() {
        // Required empty public constructor
    }


    public static Fragment_AAC newInstance(String param1, String param2) {
        Fragment_AAC fragment = new Fragment_AAC();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        ListAdapter adapter = new ArrayAdapter<>(getActivity(),
                android.R.layout.simple_list_item_1, base_AAC);
        setListAdapter(adapter);

标记：

<FrameLayout 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"
    tools:context="com.shark.sportplus.fragments.Fragment_AAC"
    android:id="@+id/nav_aac">

    <ListView
        android:id="@+id/listView_aac"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </ListView>

</FrameLayout>

日志：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sharkitt.sportplus/com.sharkitt.sportplus.MainActivity}: java.lang.IllegalStateException: Fragment Fragment_AAC{9fe2943} not attached to Activity
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2455)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2515)
at android.app.ActivityThread.access$1000(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1379)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5555)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635)
Caused by: java.lang.IllegalStateException: Fragment Fragment_AAC{9fe2943} not attached to Activity
at android.app.Fragment.getResources(Fragment.java:805)
at com.sharkitt.sportplus.fragments.Fragment_AAC.<init>(Fragment_AAC.java:22)
at com.sharkitt.sportplus.MainActivity.onCreate(MainActivity.java:66)
at android.app.Activity.performCreate(Activity.java:6357)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2408)
... 9 more

PS不建议从android.support.v4.app.ListFragment继承，因为FragmentTransaction会停止工作

java

2 个回答

  1. 从常规片段派生并插入列表。

    • 0
  2. Best Answer

    如果有人需要的话。删除以下内容：

     @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        ListAdapter adapter = new ArrayAdapter<>(getActivity(),
                android.R.layout.simple_list_item_1, base_AAC);
        setListAdapter(adapter);

    添加：

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment__aac, container, false);

        String[] base_AAC = getResources().getStringArray(R.array.base_AAC);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getContext(),
                android.R.layout.simple_list_item_1,
                base_AAC
        );

        ListView listView_aac = (ListView) view.findViewById(R.id.listView_aac);
        listView_aac.setAdapter(adapter);


        return view;
    }
    • 0

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