Android ExpandableListView实现QQ好友列表效果

来源：互联网发布：网页美工做什么编辑：程序博客网时间：2024/04/29 16:27

我们知道QQ好友列表分类使用ExpandableListView实现的,但是它在此基础上做改进,如打开分组,滑动时组标题会悬浮在最上端.

方便用户关闭分组.效果类似于下图:

实现代码如下所示:

@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {//防止三星,魅族等手机第一个条目可以一直往下拉,父条目和悬浮同时出现的问题if(firstVisibleItem==0){view_flotage.setVisibility(View.GONE);}// 控制滑动时TextView的显示与隐藏int npos = view.pointToPosition(0, 0);if (npos != AdapterView.INVALID_POSITION) {long pos = expandableList.getExpandableListPosition(npos);int childPos = ExpandableListView.getPackedPositionChild(pos);final int groupPos = ExpandableListView.getPackedPositionGroup(pos);if (childPos == AdapterView.INVALID_POSITION) {View groupView = expandableList.getChildAt(npos- expandableList.getFirstVisiblePosition());indicatorGroupHeight = groupView.getHeight();}if (indicatorGroupHeight == 0) {return;}// if (isExpanded) {if (count_expand > 0) {the_group_expand_position = groupPos;group_content.setText(groupData.get(the_group_expand_position).get("group_text"));if (the_group_expand_position != groupPos||!expandableList.isGroupExpanded(groupPos)) {view_flotage.setVisibility(View.GONE);} else {view_flotage.setVisibility(View.VISIBLE);}}if (count_expand == 0) {view_flotage.setVisibility(View.GONE);}}if (the_group_expand_position == -1) {return;}/** * calculate point (0,indicatorGroupHeight) */int showHeight = getHeight();MarginLayoutParams layoutParams = (MarginLayoutParams) view_flotage.getLayoutParams();// 得到悬浮的条滑出屏幕多少layoutParams.topMargin = -(indicatorGroupHeight - showHeight);view_flotage.setLayoutParams(layoutParams);}

有的手机品牌不一样可能会出现如下情况:

所以需要加上如下代码:

//防止三星,魅族等手机第一个条目可以一直往下拉,父条目和悬浮同时出现的问题if(firstVisibleItem==0){view_flotage.setVisibility(View.GONE);}

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最近有些网友需要代码,现在附上下载地址.http://download.csdn.net/detail/johnny901114/4513242

欢迎转载:http://blog.csdn.net/johnny901114/article/details/7841685