Android开发之使用ExpandableListView实现时间轴
1.首先看下运行效果吧
运行效果图
2.代码结构图
代码结构图
3.具体实现步骤
<1>首先定义一级实体类GroupStatusEntity.java
<2>定义二级实体类ChildStatusEntity.java
<3>定义ExpandableListView的适配器类StatusExpandAdapter.java
public class StatusExpandAdapter extends BaseExpandableListAdapter {
private LayoutInflater inflater = null;
private List<GroupStatusEntity> groupList;
/**
* 构造方法
*/
public StatusExpandAdapter(Context context,
List<GroupStatusEntity> group_list) {
this.groupList = group_list;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
/**
* 返回一级Item总数
*/
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return groupList.size();
}
/**
* 返回二级Item总数
*/
@Override
public int getChildrenCount(int groupPosition) {
if (groupList.get(groupPosition).getChildList() == null) {
return 0;
} else {
return groupList.get(groupPosition).getChildList().size();
}
}
/**
* 获取一级Item内容
*/
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return groupList.get(groupPosition);
}
/**
* 获取二级Item内容
*/
@Override
public Object getChild(int groupPosition, int childPosition) {
return groupList.get(groupPosition).getChildList().get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
GroupViewHolder holder = new GroupViewHolder();
if (convertView == null) {
convertView = inflater.inflate(R.layout.group_status_item, null);
}
holder.groupName = (TextView) convertView
.findViewById(R.id.one_status_name);
holder.groupName.setText(groupList.get(groupPosition).getGroupName());
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
ChildViewHolder viewHolder = null;
ChildStatusEntity entity = (ChildStatusEntity) getChild(groupPosition,
childPosition);
if (convertView != null) {
viewHolder = (ChildViewHolder) convertView.getTag();
} else {
viewHolder = new ChildViewHolder();
convertView = inflater.inflate(R.layout.child_status_item, null);
viewHolder.twoStatusTime = (TextView) convertView
.findViewById(R.id.two_complete_time);
}
viewHolder.twoStatusTime.setText(entity.getCompleteTime());
convertView.setTag(viewHolder);
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return false;
}
private class GroupViewHolder {
TextView groupName;
}
private class ChildViewHolder {
public TextView twoStatusTime;
}
}
<4>下面给出资源类的文件实现
首先是一级实体类的布局文件group_status_item.xml
其次是二级实体类的布局文件child_status_item.xml
其次是实现drawable文件中的资源文件list_line.xml