Question

我有一个Activity，其布局包含一个带有FrameLayout + ListView的DrawerLayout（来自支持的库）。在我的FrameLayout中，我有一个ListFragment，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，来自onActivityCreated的setListAdapter（listAdapter）行似乎存在问题，它会引发此异常：

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）：at dalvik.system.NativeStart.main（Native Method）

这段代码有什么问题？

Answer 1

尝试将listview作为参数而不是片段的容器传递：

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    mListHeader = inflater.inflate(R.layout.header, view, false);
    mListFooter = inflater.inflate(R.layout.footer, view, false);
}

并移除整个onCreateView方法，ListFragment已调用inflater.inflate(com.android.internal.R.layout.list_content, container, false);

如果您仍然遇到相同的错误，那么我认为您的MyAdapter可能存在问题。

希望这会对你有所帮助:)。

Answer 2

使用页眉和页脚的代码：

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

如果您使用当前代码，夸大的观看次数mListHeader和mListFooter将LayoutParams作为FrameLayout.LayoutParams的实例（您将container作为第二个参数，它基本上建议膨胀的视图将具有的父类型）。但是，当您致电setListAdapter()时，ListView会做一些工作，它会迭代上面的视图并访问他们的LayoutParams（ListView期望成为一个实例导致AbsListView.LayoutParams的{{1}}。{/ p>

ListFragment setListAdapter

2 个答案: