Android版手风琴(ExpandableListView)
Android版手风琴(ExpandableListView)
先看效果,过瘾一番。
源码下载:http://files.cnblogs.com/salam/WidgetDemo.rar
ExpandableListView是Android中的手风琴,本人感觉效果相当棒。
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) {
intgroupPos =ExpandableListView.getPackedPositionGroup(menuInfo.packedPosition);
intchildPos =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。
1.重要方法
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。
2.代码
public class MyExpandableListAdapter extends BaseExpandableListAdapter { // Sample data set. children[i] contains the children (String[]) for groups[i]. public String[] groups = { "我的好友", "新疆同学", "亲戚", "同事" }; public String[][] children = { { "胡算林", "张俊峰", "王志军", "二人" }, { "李秀婷", "蔡乔", "别高", "余音" }, { "摊派新", "张爱明" }, { "马超", "司道光" } }; public Object getChild(int groupPosition, int childPosition) { return children[groupPosition][childPosition]; } public long getChildId(int groupPosition, int childPosition) { return childPosition; } public int getChildrenCount(int groupPosition) { return children[groupPosition].length; } public TextView getGenericView() { // Layout parameters for the ExpandableListView AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, 64); TextView textView = new TextView(ExpandableListDemo.this); textView.setLayoutParams(lp); // Center the text vertically textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); // Set the text starting position textView.setPadding(36, 0, 0, 0); return textView; } public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getChild(groupPosition, childPosition).toString()); return textView; } public Object getGroup(int groupPosition) { return groups[groupPosition]; } public int getGroupCount() { return groups.length; } public long getGroupId(int groupPosition) { return groupPosition; } public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getGroup(groupPosition).toString()); return textView; } public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } public boolean hasStableIds() { return true; } }<!--end: topics 文章、评论容器-->
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