关于ListView的HeaderView
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1. 可点击/不可点击
private void addHeaderView(){View headerView = this.mInflater.inflate(R.layout.XXX_header_info, this.listView, false);this.headerInfo = (TextView) headerView.findViewById(R.id.XXX_HeaderInfo);//this.listView.addHeaderView(headerView);//让HeaderView不可点击 this.listView.addHeaderView(headerView, null, false);this.headerInfo.setVisibility(View.GONE);}
2. HeaderView滑动到完全看不到之后隐藏
this.listView.setOnScrollListener(new OnScrollListener() {@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {if(scrollState == SCROLL_STATE_IDLE && headerInfo.getVisibility() == View.VISIBLE && listView.getFirstVisiblePosition() > 0) {//listView.removeHeaderView(headerView);headerInfo.setVisibility(View.GONE);}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {}});如果刷新后需要显示HeaderView,再次设置可见即可:
private void setHeaderInfo(int num) {String text = String.format("关于“%s”,共%d条评论。", XXXXData.name, num);this.headerInfo.setText(text);this.headerInfo.setVisibility(View.VISIBLE);}而不必在removeHeaderView之后再次add:
if(this.listView.getHeaderViewsCount() <= 0) {this.listView.addHeaderView(this.headerView, null, false);}
采用removeHeaderView()方法移除headerView的方法会出现显示问题:直接移除ListView的列表头会出现屏幕跳动,改为设置headerView的子视图不可见即可。
这里的headerInfo是headerView的子视图,直接设置headerView不可见的话,headerView是看不到了,但是仍然占用了listView视图的高度,只是显示为空白而已。下面是XXX_HeaderInfo.xml:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/XXX_HeaderInfo" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_vertical" android:padding="9dp" android:textColor="@color/text_color" android:textSize="@dimen/title_text_size" android:background="#fefee2"/></LinearLayout>
这里没有给根视图添加背景,而是把背景设置到了子视图TextView的背景上了。
直接add/remove headerView在某些机型上可能会出现问题,也可以通过往headerView里添加移除子视图headerInfo的方式来实现。其他要注意的地方就是在给listView增加页眉、页脚的时机要在setAdapter之前,这是add的代码:
/** * Add a fixed view to appear at the top of the list. If addHeaderView is * called more than once, the views will appear in the order they were * added. Views added using this call can take focus if they want. * <p> * NOTE: Call this before calling setAdapter. This is so ListView can wrap * the supplied cursor with one that will also account for header and footer * views. * * @param v The view to add. * @param data Data to associate with this view * @param isSelectable whether the item is selectable */public void addHeaderView(View v, Object data, boolean isSelectable) { if (mAdapter != null) { 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);}通过设置headerView不可见,并且remove页眉的方式,屏幕出现了跳动。刷新数据后设置可见、add页眉,也没有出错,如果只是通过原代码来解释似乎不通。
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