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

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't47             // 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

@Overridepublic 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.

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