带你一起走进ExpandListView的深入嵌套，实现不一样的城市选择

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:gravity="center"
    tools:context=".MainActivity" >
    <ExpandableListView
        android:id="@+id/expandlistview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#ffffff"
        android:cacheColorHint="#00000000"
        android:groupIndicator="@null"
        android:listSelector="#00000000" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="horizontal" >
    <TextView
        android:id="@+id/textAddress"
         android:layout_width="0dip"
         android:paddingTop="10dip"
         android:paddingBottom="10dip"
         android:layout_weight="1"
         android:gravity="center_vertical|center_horizontal"
         android:layout_height="wrap_content"
         android:text=""
        android:background="@drawable/press_down"
        />
     <TextView
        android:id="@+id/textAddress1"
          android:layout_width="0dip"
         android:layout_weight="1"
         android:paddingTop="10dip"
         android:paddingBottom="10dip"
           android:gravity="center_vertical|center_horizontal"
         android:layout_height="wrap_content"
         android:text=""
       android:background="@drawable/press_down"
        />
      <TextView
        android:id="@+id/textAddress2"
          android:layout_width="0dip"
         android:layout_weight="1"
          android:paddingTop="10dip"
         android:paddingBottom="10dip"
         android:layout_height="wrap_content"
           android:gravity="center_vertical|center_horizontal"
         android:text=""
          android:background="@drawable/press_down"
        />
       <TextView
        android:id="@+id/textAddress3"
           android:layout_width="0dip"
         android:layout_weight="1"
          android:paddingTop="10dip"
         android:paddingBottom="10dip"
         android:layout_height="wrap_content"
           android:gravity="center_vertical|center_horizontal"
         android:text=""
         android:background="@drawable/press_down"
        />
        <TextView
        android:id="@+id/textAddress4"
           android:layout_width="0dip"
         android:layout_weight="1"
         android:paddingTop="10dip"
         android:paddingBottom="10dip"
           android:gravity="center_vertical|center_horizontal"
         android:layout_height="wrap_content"
         android:text=""
         android:background="@drawable/press_down"
        />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
   >
    <com.example.testcitysearch.CustomGridView
        android:id="@+id/child_gridview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numColumns="5"
        android:verticalSpacing="0dip"
        android:background="@color/main_divider"
        android:horizontalSpacing="0dip"
        android:stretchMode="columnWidth"
        android:gravity="center"
        />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/main_divider"
    android:orientation="horizontal" >
    <TextView
        android:id="@+id/textAddress"
         android:layout_width="0dip"
         android:layout_weight="1"
         android:paddingTop="6dip"
         android:paddingBottom="6dip"
         android:gravity="center_vertical|center_horizontal"
         android:layout_height="wrap_content"
         android:text=""
        android:background="@drawable/bac_shape"
        />
</LinearLayout>

package com.example.testcitysearch;

import java.io.Serializable;
import java.util.List;
/**
 * 
 * @author jamy
 *
 */
public class GroupCountBean implements Serializable{
	//组数
   public int groupcount;
   //所有组集合
   public List<GroupBean> list;
	public List<GroupBean> getList() {
		return list;
	}

	public void setList(List<GroupBean> list) {
		this.list = list;
	}
}

package com.example.testcitysearch;

import java.io.Serializable;
import java.util.List;
/**
 * 
 * @author jamy
 *每组元素属性
 */
public class GroupBean implements Serializable{
   //省份名字
   public String provincename;
   //子元素的个数
   public int childsize;
   //每一组中的子元素个数
   public int singleSize;
   public List<MemberBean> list;
	public List<MemberBean> getList() {
		return list;
	}

	public void setList(List<MemberBean> list) {
		this.list = list;
	}
   
}

package com.example.testcitysearch;

import java.io.Serializable;
/**
 * 
 * @author jamy
 *每个子元素的属性
 */
public class MemberBean implements Serializable{
  //标题
  public String title;
  //价格
  public String price;
  //二手价格
  public String secondPrice;
  //标志位
  public int flag;
}

package com.example.testcitysearch;

import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {
	private ExpandableListView mListView;
	// 每组的实体类对象
	private GroupBean mGroupBean;
	// 每个子元素的实体类对象
	private MemberBean mMemBean;
	// 存储一组数据
	private List<GroupBean> group_list;
	// 存储子数据
	private List<MemberBean> child_list;
	// 存储总共有多少组
	private List<GroupCountBean> groupcount_list;
	// flag作为每行的标记 flag=0 表示每行的第一个元素后面依次类推
	private int flag = -1;
	// 所有组实体类
	private GroupCountBean mGroupCountBean;
	// 每个省份所有的城市适配器
	private myAdapter adp = null;;
	// 设置每一行的其中的计数器，用于记录被点击的次数
	private int countOne = 0, countTwo = 0, countThree = 0, countFor = 0,
			countFiv = 0;
	// 用来临时寄存groupPosition的值
	private int groupTemp = -1;
	// ExpandListView 适配器
	private ExAdapter adapter;
	private Context mContext;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initView();
	}

	/**
	 * 初始化控件
	 */
	private void initView() {
		mContext = MainActivity.this;
		// 存储总共有多少组
		groupcount_list = new ArrayList<GroupCountBean>();
		mListView = (ExpandableListView) findViewById(R.id.expandlistview);
		// 添加本地假数据
		addDatas();
		System.out.println(group_list.toString());
		// 扩展ListView Adapter
		adapter = new ExAdapter();
		mListView.setAdapter(adapter);

		/**
		 * 设置Group默认不展开
		 */
		mListView.setOnGroupExpandListener(new OnGroupExpandListener() {
			@Override
			public void onGroupExpand(int groupPosition) {
				System.out.println(groupPosition);
				for (int i = 0; i < groupcount_list.size(); i++) {
					if (groupPosition != i) {
						mListView.collapseGroup(i);
					}
				}
			}
		});

	}

	/**
	 * 添加本地数据
	 */
	private void addDatas() {
		/**
		 * 添加六组数据 k表示添加的Group数
		 */
		for (int k = 0; k < 6; k++) {
			// 新建GroupBean实体类
			mGroupCountBean = new GroupCountBean();

			// 存储每一组数据的集合
			group_list = new ArrayList<GroupBean>();

			mGroupCountBean.groupcount = 5;
			int temp = mGroupCountBean.groupcount;
			// group==0表示第一组，先测试第一组

			/**
			 * 每组中有五个子元素 i表示每组中子元素的个数
			 */
			for (int i = 0; i < temp; i++) {
				// 每个Group中的属性
				mGroupBean = new GroupBean();
				mGroupBean.provincename = "广东" + i;
				// 子孩子的数目
				mGroupBean.childsize = 8;
				int tep = mGroupBean.childsize;
				// 总的每一Group中的TextView数目
				mGroupBean.singleSize = 5;
				child_list = new ArrayList<MemberBean>();
				for (int j = 0; j < tep; j++) {
					// 定义每个childItem的实体类
					mMemBean = new MemberBean();
					mMemBean.title = "深圳" + k + "-" + i + "-" + j;
					// 将child对象添加到ChildList中
					child_list.add(mMemBean);
				}

				// 将child_list数据添加到GroupBean实体类中
				mGroupBean.setList(child_list);
				// 将mGroupBean数据添加到group_list集合中
				group_list.add(mGroupBean);
				System.out.println(child_list.toString());
			}

			// 向每组中添加数据
			mGroupCountBean.setList(group_list);
			// 将六组数据添加到组集合中
			groupcount_list.add(mGroupCountBean);
		}
	}

	/**
	 * 
	 * @author Jamy 扩展ListView Adapter
	 */
	class ExAdapter extends BaseExpandableListAdapter {

		@Override
		public Object getGroup(int groupPosition) {

			return null;
		}

		@Override
		public int getGroupCount() {

			return groupcount_list.size();
		}

		@Override
		public long getGroupId(int groupPosition) {

			return groupPosition;
		}

		// 第一组
		@Override
		public View getGroupView(int groupPosition, boolean isExpanded,
				View convertView, ViewGroup parent) {
			View view = null;
			GroupHolder groupholder = null;
			if (convertView == null) {
				view = View.inflate(MainActivity.this, R.layout.group_item,
						null);
				groupholder = new GroupHolder();
				groupholder.mTextView = (TextView) view
						.findViewById(R.id.textAddress);
				groupholder.mTextView1 = (TextView) view
						.findViewById(R.id.textAddress1);
				groupholder.mTextView2 = (TextView) view
						.findViewById(R.id.textAddress2);
				groupholder.mTextView3 = (TextView) view
						.findViewById(R.id.textAddress3);
				groupholder.mTextView4 = (TextView) view
						.findViewById(R.id.textAddress4);
				groupholder.mTextView.setOnClickListener(MainActivity.this);
				groupholder.mTextView1.setOnClickListener(MainActivity.this);
				groupholder.mTextView2.setOnClickListener(MainActivity.this);
				groupholder.mTextView3.setOnClickListener(MainActivity.this);
				groupholder.mTextView4.setOnClickListener(MainActivity.this);
				view.setTag(groupholder);
			} else {
				view = convertView;
				groupholder = (GroupHolder) view.getTag();
			}
			int temp = 0;

			// groupholder.mTextView1.setTag(groupPosition);//设置group的标志
			// 设置第groupPosition组，第一个元素
			groupholder.mTextView.setTag(R.id.textAddress1, 0);
			groupholder.mTextView.setTag(R.id.textAddress2, groupPosition);
			// 设置第groupPosition组，第二个元素
			groupholder.mTextView1.setTag(R.id.textAddress1, 1);
			groupholder.mTextView1.setTag(R.id.textAddress2, groupPosition);
			// 设置第groupPosition组，第三个元素
			groupholder.mTextView2.setTag(R.id.textAddress1, 2);
			groupholder.mTextView2.setTag(R.id.textAddress2, groupPosition);
			// 设置第groupPosition组，第四个元素
			groupholder.mTextView3.setTag(R.id.textAddress1, 3);
			groupholder.mTextView3.setTag(R.id.textAddress2, groupPosition);
			// 设置第groupPosition组，第五个元素
			groupholder.mTextView4.setTag(R.id.textAddress1, 4);
			groupholder.mTextView4.setTag(R.id.textAddress2, groupPosition);
			// 设置对应的省名
			groupholder.mTextView.setText(group_list.get(temp).provincename);
			groupholder.mTextView1.setText(group_list.get(++temp).provincename);
			groupholder.mTextView2.setText(group_list.get(++temp).provincename);
			groupholder.mTextView3.setText(group_list.get(++temp).provincename);
			groupholder.mTextView4.setText(group_list.get(++temp).provincename);

			return view;
		}

		@Override
		public Object getChild(int groupPosition, int childPosition) {

			return null;
		}

		@Override
		public long getChildId(int groupPosition, int childPosition) {

			return childPosition;
		}

		/**
		 * 记得这里要设置为1，否则每组会出现多个相同的GridView
		 * 
		 */
		@Override
		public int getChildrenCount(int groupPosition) {

			return 1;
		}

		@Override
		public boolean hasStableIds() {

			return true;
		}

		@Override
		public boolean isChildSelectable(int groupPosition, int childPosition) {

			return true;
		}

		@Override
		public View getChildView(final int groupPosition,
				final int childPosition, boolean isLastChild, View convertView,
				ViewGroup parent) {
			View view = null;
			ChildHolder childholder = null;
			if (convertView == null) {
				view = View.inflate(MainActivity.this, R.layout.child_item,
						null);
				childholder = new ChildHolder();
				childholder.mGridView = (CustomGridView) view
						.findViewById(R.id.child_gridview);
				view.setTag(childholder);
			} else {
				view = convertView;
				childholder = (ChildHolder) view.getTag();
			}

			// 传参数GroupPosition和flag，以方便对应的组和组中第一个元素查找
			adp = new myAdapter(groupPosition, flag);
			childholder.mGridView.setAdapter(adp);
			childholder.mGridView
					.setOnItemClickListener(new OnItemClickListener() {

						@Override
						public void onItemClick(AdapterView<?> arg0, View arg1,
								int arg2, long arg3) {
							GroupCountBean gb = groupcount_list
									.get(groupPosition);
							GroupBean sb = gb.getList().get(flag);
							String title = sb.getList().get(arg2).title;
							System.out.println(title + "------------->");
							Toast.makeText(mContext, title, Toast.LENGTH_SHORT)
									.show();
						}
					});
			return view;
		}

	}

	/**
	 * 每个省份所有的城市适配器
	 * 
	 */
	class myAdapter extends BaseAdapter {
		private List<MemberBean> mDatas;// 定义一个中间变量存放每个省的数据
		int group;
		int temp;

		public myAdapter(int group, int index) {
			super();
			GroupCountBean gb = groupcount_list.get(group);
			GroupBean sb = gb.getList().get(index);
			mDatas = sb.getList();
			this.group = group;
			this.temp = index;
		}

		@Override
		public int getCount() {
			return mDatas == null ? 0 : mDatas.size();
		}

		@Override
		public Object getItem(int position) {
			return null;
		}

		@Override
		public long getItemId(int position) {
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			View view = null;
			GroupHolder groupholder = null;
			if (convertView == null) {
				view = View.inflate(MainActivity.this, R.layout.group_item2,
						null);
				groupholder = new GroupHolder();
				groupholder.mTextView = (TextView) view
						.findViewById(R.id.textAddress);
				view.setTag(groupholder);
			} else {
				view = convertView;
				groupholder = (GroupHolder) view.getTag();
			}
			groupholder.mTextView.setText(mDatas.get(position).title);
			return view;
		}

	}
	/**
	 * 判断并处理Group的展开收缩以及数据更新
	 * @param isExpand
	 * @param count
	 * @param group
	 */
	private void HandleExpandEvent(boolean isExpand,int count,int group){
		if (isExpand) {
			if (count % 2 != 0) {
				mListView.collapseGroup(group);
				isExpand = false;
			} else {
				isExpand = true;
				adp.notifyDataSetChanged();
				adapter.notifyDataSetChanged();
			}
			isExpand = false;
		} else {
			isExpand = true;
			mListView.expandGroup(group);
		}
	}
	
	/**
	 * 1.flag作为每行的标记 flag=0 表示每行的第一个元素后面依次类推
	 * 2.用一个groupTemp临时变量来存放group的值，如果不同则将TextView所有的计数器的值设置为0
	 * 3.点击当前的TextView时将其他TextView的计数器设置为0
	 * 4.CountOne......CountFiv分别表示对应TextView点击的计数器
	 */
	@Override
	public void onClick(View v) {
		int Id = v.getId();
		boolean isExpand = false;
		int g = -1;
		// 每行中元素的下标
		flag = (Integer) v.getTag(R.id.textAddress1);
		//每行所在的下标
		g = (Integer) v.getTag(R.id.textAddress2);// Row num
		if (groupTemp != g) {
			groupTemp = g;
			//初始化计数模式
			setDefault();
		}
		//判断当前行是否展开
		isExpand = mListView.isGroupExpanded(g);
		switch (Id) {
		case R.id.textAddress:
			countTwo = 0;
			countThree = 0;
			countFiv = 0;
			countFor = 0;
			HandleExpandEvent(isExpand, countOne, g);
			countOne++;
			break;
		case R.id.textAddress1:
			countOne = 0;
			countThree = 0;
			countFiv = 0;
			countFor = 0;
			HandleExpandEvent(isExpand, countTwo, g);
			countTwo++;
			break;
		case R.id.textAddress2:
			countTwo = 0;
			countOne = 0;
			countFiv = 0;
			countFor = 0;
			HandleExpandEvent(isExpand, countThree, g);
			countThree++;
			break;
		case R.id.textAddress3:
			countTwo = 0;
			countThree = 0;
			countFiv = 0;
			countOne = 0;
			HandleExpandEvent(isExpand, countFor, g);
			countFor++;
			break;
		case R.id.textAddress4:
			countTwo = 0;
			countThree = 0;
			countOne = 0;
			countFor = 0;
			HandleExpandEvent(isExpand, countFiv, g);
			countFiv++;
			break;
		default:
			break;
		}
	}

	/**
	 * 每一个行Group包含五个TextView
	 */
	static class GroupHolder {
		// 每组中第一个TextView
		TextView mTextView;
		// 每组中第二个TextView
		TextView mTextView1;
		// 每组中第三个TextView
		TextView mTextView2;
		// 每组中第四个TextView
		TextView mTextView3;
		// 每组中第五个TextView
		TextView mTextView4;
	}

	/**
	 * 子元素是一个GridView
	 */
	static class ChildHolder {
		CustomGridView mGridView;
	}

	/**
	 * 初始化默认的点击次数
	 */
	private void setDefault() {
		countOne = 0;
		countTwo = 0;
		countThree = 0;
		countFor = 0;
		countFiv = 0;
	}
	
	
}