ListView添加HeaderView出现Cannot add header view to list -- setAdapter has already been called.

今天项目由于需要根据动态数据来控制ListView的头部，但在4.2系统出现如下异常：

java.lang.IllegalStateException: Cannot add header view to list -- setAdapter has already been called. at android.widget.ListView.addHeaderView(ListView.java:264)

分析4.2的源码如下：4.2的ListView需要在setAdapter之前调用addHeaderView，否则会出现异常。

  public void addHeaderView(View v, Object data, boolean isSelectable) {           if (mAdapter != null && ! (mAdapter instanceof HeaderViewListAdapter)) {             throw new IllegalStateException(                     "Cannot add header view to list -- setAdapter has already been called.");          }           FixedViewInfo info = new FixedViewInfo();          info.view = v;          info.data = data;          info.isSelectable = isSelectable;          mHeaderViewInfos.add(info);           // in the case of re-adding a header view, or adding one later on,          // we need to notify the observer         if (mAdapter != null && mDataSetObserver != null) {              mDataSetObserver.onChanged();         }  }

那么对于需要根据数据来动态控制是否addHeaderView，需要怎么办呢？可以通过控制HeaderView的Visiable属性进行控制。初始化就加载HeaderView，设置为GONE。然后根据

数据动态控制，这里需要注意如果HeaderView的布局有2层以上，需要拿到第二层的layout去设置Gone，才能生效。