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?
最佳答案
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
。
关于android - ListFragment setListAdapter,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21337717/