在使用ListFragment的setEmptyText时报java.lang.IllegalStateException: Can't be used with a custom content view错误

今天搞了好久, 才基本解决了这个问题. 

 1 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"

 2     android:layout_width="match_parent"

 3     android:layout_height="match_parent" >

 4     

 5     <ListView 

 6         android:id="@android:id/list"  <!--这样命名我就不多说了-->

 7         style="@style/MyListView"

 8         android:layout_width="match_parent"

 9         android:layout_height="match_parent"/>

10 

11     <TextView 

12         android:id="@android:id/empty"  <!-- 为什么这样命名,且看下文 -->

13         android:layout_width="wrap_content"

14         android:layout_height="wrap_content"

15         android:layout_gravity="center"/>

16         

17 </FrameLayout>

//且看源码ListFragment


 1 private void ensureList() {

 2         if (mList != null) {

 3             return;

 4         }

 5         View root = getView();

 6         if (root == null) {

 7             throw new IllegalStateException("Content view not yet created");

 8         }

 9         if (root instanceof ListView) {

10             mList = (ListView)root;

11         } else {

12             mStandardEmptyView = (TextView)root.findViewById(INTERNAL_EMPTY_ID);

13             if (mStandardEmptyView == null) {

14                 mEmptyView = root.findViewById(android.R.id.empty);  //且看这里

15             } else {

16                 mStandardEmptyView.setVisibility(View.GONE);

17             }

18             mProgressContainer = root.findViewById(INTERNAL_PROGRESS_CONTAINER_ID);

19             mListContainer = root.findViewById(INTERNAL_LIST_CONTAINER_ID);

20             View rawListView = root.findViewById(android.R.id.list);

21             if (!(rawListView instanceof ListView)) {

22                 if (rawListView == null) {

23                     throw new RuntimeException(

24                             "Your content must have a ListView whose id attribute is " +

25                             "'android.R.id.list'");

26                 }

27                 throw new RuntimeException(

28                         "Content has view with id attribute 'android.R.id.list' "

29                         + "that is not a ListView class");

30             }

31             mList = (ListView)rawListView;

32             if (mEmptyView != null) {

33                 mList.setEmptyView(mEmptyView);

34             } else if (mEmptyText != null) {

35                 mStandardEmptyView.setText(mEmptyText);

36                 mList.setEmptyView(mStandardEmptyView);

37             }

38         }

39         mListShown = true;

40         mList.setOnItemClickListener(mOnClickListener);

41         if (mAdapter != null) {

42             ListAdapter adapter = mAdapter;

43             mAdapter = null;

44             setListAdapter(adapter);

45         } else {

46             // We are starting without an adapter, so assume we won't

47             // have our data right away and start with the progress indicator.

48             if (mProgressContainer != null) {

49                 setListShown(false, false);

50             }

51         }

52         mHandler.post(mRequestFocus);

53     }

在程序中重写

@Override

public void setEmptyText(CharSequence text) {

    TextView emptyView = (TextView)getListView().getEmptyView();

    emptyView.setVisibility(View.GONE);

    emptyView.setText(text);

}

然后就可以

setEmptyText(getString(R.string.list_no_data));

这样就成功了.

setEmptyText(CharSequence text) 只能用在ListFragment默认视图. 其背后还是用的ListView的setEmptyView()所以可以通过getEmptyView获取这个视图.