/** 三层树结构中的第二层是一个ExpandableListView */
public View getChildView(
int groupPosition,
int childPosition,
boolean isLastChild,
View convertView,
ViewGroup parent) {
// 是
final ExpandableListView treeView = getExpandableListView();
final ThreeViewAdapter treeViewAdapter = new ThreeViewAdapter(this.parentContext, 0);
List<ThreeViewAdapter.TreeNode> tmp =
treeViewAdapter.GetTreeNode(); // 临时变量取得TreeViewAdapter的TreeNode集合，可为空
final ThreeViewAdapter.TreeNode treeNode =
(ThreeViewAdapter.TreeNode) getChild(groupPosition, childPosition);
tmp.add(treeNode);
treeViewAdapter.UpdateTreeNode(tmp);
treeView.setAdapter(treeViewAdapter);
// 关键点：取得选中的二级树形菜单的父子节点,结果返回给外部回调函数
treeView.setOnChildClickListener(this.stvClickEvent);
/** 关键点：第二级菜单展开时通过取得节点数来设置第三级菜单的大小 */
treeView.setOnGroupExpandListener(
new OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
AbsListView.LayoutParams lp =
new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
(treeNode.childs.size() + 1) * ThreeViewAdapter.ItemHeight + 10);
treeView.setLayoutParams(lp);
}
});
/** 第二级菜单回收时设置为标准Item大小 */
treeView.setOnGroupCollapseListener(
new OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
AbsListView.LayoutParams lp =
new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, ThreeViewAdapter.ItemHeight);
treeView.setLayoutParams(lp);
}
});
treeView.setPadding(ThreeViewAdapter.PaddingLeft, 0, 0, 0);
return treeView;
}
/** 三级树结构中的首层是TextView,用于作为title */
public View getGroupView(
int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
TextView textView = ThreeViewAdapter.getTextView(this.parentContext);
textView.setText(getGroup(groupPosition).toString());
textView.setPadding(ThreeViewAdapter.PaddingLeft, 0, 0, 0);
return textView;
}
