android - ListFragment setListAdapter

Question

我有一个 Activity，其布局包含一个 DrawerLayout(来自支持的库)和一个 FrameLayout + ListView。 在我的 FrameLayout 中，我有一个 ListFragment，它看起来像这样 (aprox):

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View fragmentView = inflater.inflate(R.layout.fragment_post,
            container, false);

    mListHeader = inflater.inflate(R.layout.header,
            container, false);
    mListFooter = inflater.inflate(R.layout.footer,
            container, false);

    // inflate xml layout into Views
    linkUI();

    // set Views actions
    setAction();

    return fragmentView;

}

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

    // add header and footer before settings adapter (to work in
    // pre-KITKAT versions)
    getListView().addHeaderView(mListHeader);
    getListView().addFooterView(mListFooter);

    if (listAdapter == null) {
        listAdapter = new MyAdapter(getActivity());
    }

    setListAdapter(listAdapter);
    pbListLoading.setVisibility(View.VISIBLE);

}

@Override
public void onDestroy() {
    setListAdapter(null);
    super.onDestroy();
}

问题是，似乎有一个问题:来自 onActivityCreated 的 setListAdapter(listAdapter) 行，抛出此异常:

01-24 18:20:55.336: E/AndroidRuntime(20789): FATAL EXCEPTION: main
01-24 18:20:55.336: E/AndroidRuntime(20789): java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.widget.ListView.clearRecycledState(ListView.java:519)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.widget.ListView.resetList(ListView.java:505)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.widget.ListView.setAdapter(ListView.java:448)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.support.v4.app.ListFragment.setListAdapter(ListFragment.java:182)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at com.example.PostFragment.onActivityCreated(PostFragment.java:138)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1508)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.os.Handler.handleCallback(Handler.java:615)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.os.Handler.dispatchMessage(Handler.java:92)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.os.Looper.loop(Looper.java:153)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at android.app.ActivityThread.main(ActivityThread.java:5006)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at java.lang.reflect.Method.invokeNative(Native Method)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at java.lang.reflect.Method.invoke(Method.java:511)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)
01-24 18:20:55.336: E/AndroidRuntime(20789):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)

01-24 18:20:55.336: E/AndroidRuntime(20789): 在 dalvik.system.NativeStart.main(本地方法)

这段代码可能有什么问题？

Answer 1

对于页眉和页脚的代码使用:

mListHeader = inflater.inflate(R.layout.header, null);
mListFooter = inflater.inflate(R.layout.footer, null);

如果您使用当前代码，膨胀 View mListHeader 和 mListFooter 将具有 LayoutParams FrameLayout.LayoutParams< 的实例(您将 container 作为第二个参数传递，这基本上暗示了膨胀 View 将具有的父级类型)。但是，当您调用 setListAdapter() 时，ListView 会在后台执行一些工作，它将遍历上面的 View 并访问它们的 LayoutParams( ListView 应该是 AbsListView.LayoutParams 的实例)导致 ClassCastException。