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android中不错的ExpandableListView实例效果源码

于 2013-03-07 发布
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一、ExpandableListView介绍     一个垂直滚动的显示两个级别(Child,Group)列表项的视图,列表项来自ExpandableListAdapter 。组可以单独展开。   1.重要方法       expandGroup(int groupPos) :在分组列表视图中展开一组,      setSelectedGroup(int groupPosition) :设置选择指定的组。      setSelectedChild(int groupPosition, int childPosition, boolean shouldExpandGroup) :设置选择指定的子项。      getPackedPositionGroup(long packedPosition) :返回所选择的组      getPackedPositionForChild(int groupPosition, int childPosition) :返回所选择的子项      getPackedPositionType(long packedPosition) :返回所选择项的类型(Child,Group)      isGroupExpanded(int groupPosition) :判断此组是否展开  2.代码:ExpandableListContextMenuInfo menuInfo=(ExpandableListContextMenuInfo)item.getMenuInfo();String title=((TextView)menuInfo.targetView).getText().toString();int type=ExpandableListView.getPackedPositionType(menuInfo.packedPosition);if (type==ExpandableListView.PACKED_POSITION_TYPE_CHILD) {int groupPos =ExpandableListView.getPackedPositionGroup(menuInfo.packedPosition);int childPos =ExpandableListView.getPackedPositionChild(menuInfo.packedPosition);二、ExpandableListAdapter    一个接口,将基础数据链接到一个ExpandableListView。此接口的实施将提供访问Child的数据(由组分类),并实例化的Child和Group。 getChildId(int groupPosition, int childPosition) 获取与在给定组给予孩子相关的数据。     getChildrenCount(int groupPosition) 返回在指定Group的Child数目。

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