ExpandableList 是折叠列表，通过继承ExpandableListActivity 类就可以非常简单的实现折叠列表。

效果图：

代码实现

package com.zhou.activity;

import android.app.ExpandableListActivity;

import android.os.Bundle;

import android.view.ContextMenu;

import android.view.Gravity;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.view.ContextMenu.ContextMenuInfo;

import android.widget.AbsListView;

import android.widget.BaseExpandableListAdapter;

import android.widget.ExpandableListAdapter;

import android.widget.ExpandableListView;

import android.widget.TextView;

import android.widget.Toast;

import android.widget.ExpandableListView.ExpandableListContextMenuInfo;

public class ExpandableList extends ExpandableListActivity {

//声明adapter

private ExpandableListAdapter mAdapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//设这标题

setTitle("可扩展的列表");

//实例化adapter

mAdapter = new MyExpandableListAdapter();

//为列表设置adapter

setListAdapter(mAdapter);

//为list注册context菜单

registerForContextMenu(this.getExpandableListView());

}

@Override

public boolean onChildClick(ExpandableListView parent, View v,

int groupPosition, int childPosition, long id) {

Toast.makeText(this, " 组元素索引: " + groupPosition + " 子元素索引: " + childPosition, Toast.LENGTH_SHORT).show();

return super.onChildClick(parent, v, groupPosition, childPosition, id);

}

@Override

public void onGroupExpand(int groupPosition) {

Toast.makeText(this, " 组元素索引: " + groupPosition, Toast.LENGTH_SHORT).show();

super.onGroupExpand(groupPosition);

}

@Override

public void onCreateContextMenu(ContextMenu menu, View v,

ContextMenuInfo menuInfo) {

menu.setHeaderTitle("上下文菜单");

menu.add(0, 0, 0, "单击我");

}

// 单击上下文菜单后的逻辑

@Override

public boolean onContextItemSelected(MenuItem item) {

ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();

String title = ((TextView) info.targetView).getText().toString();

int type = ExpandableListView.getPackedPositionType(info.packedPosition);

if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {

int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);

int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);

Toast.makeText(this, title + " 组元素索引: " + groupPos + " 子元素索引: " + childPos, Toast.LENGTH_SHORT).show();

return true;

} else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {

int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);

Toast.makeText(this, title + " 组元素索引: " + groupPos, Toast.LENGTH_SHORT).show();

return true;

}

return false;

}

//自定义Adapter

public class MyExpandableListAdapter extends BaseExpandableListAdapter {

// 父列表数据

private String[] groups =

{

"吉林省",

"辽宁省",

"黑龙江省",

"山东省"

};

// 子列表数据

private String[][] children =

{

{ "长春市" },

{ "沈阳市", "铁岭市" },

{ "哈尔滨市", "齐齐哈尔市", "牡丹江市" },

{ "济南市", "青岛市", "淄博市", "潍坊市" }

};

@Override

public Object getChild(int groupPosition, int childPosition) {

return children[groupPosition][childPosition];

}

@Override

public long getChildId(int groupPosition, int childPosition) {

return childPosition;

}

@Override

public int getChildrenCount(int groupPosition) {

return children[groupPosition].length;

}

// 取子列表中的某一项的 View

@Override

public View getChildView(int groupPosition, int childPosition,

boolean isLastChild, View convertView, ViewGroup parent) {

TextView textView = getGenericView();

textView.setText(getChild(groupPosition, childPosition).toString());

return textView;

}

@Override

public Object getGroup(int groupPosition) {

return groups[groupPosition];

}

@Override

public int getGroupCount() {

return groups.length;

}

@Override

public long getGroupId(int groupPosition) {

return groupPosition;

}

// 取父列表中的某一项的 View

@Override

public View getGroupView(int groupPosition, boolean isExpanded,

View convertView, ViewGroup parent) {

TextView textView = getGenericView();

textView.setText(getGroup(groupPosition).toString());

return textView;

}

@Override

public boolean hasStableIds() {

return true;

}

@Override

public boolean isChildSelectable(int groupPosition, int childPosition) {

return true;

}

// 获取某一项的 View 的逻辑

private TextView getGenericView() {

AbsListView.LayoutParams lp = new AbsListView.LayoutParams(

ViewGroup.LayoutParams.FILL_PARENT, 48);

TextView textView = new TextView(ExpandableList.this);

textView.setLayoutParams(lp);

textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);

textView.setPadding(32, 0, 0, 0);

return textView;

}

}

}