ListView--QQ联系人样式

package com.example.week2_day4_qq;

import android.os.Bundle;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

private ExpandableListView listView;
// 声明数据源--组数据源
private String[] group = { "洗澡澡", "吹泡泡", "抱着枕头睡觉觉" };
private String[][] child = { { "小灰灰", "小香香", "喜洋洋" }, { "大熊", "蓝胖子" },
{ "小叮当", "奥里亚", "女王" } };
private MyAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);// 加载布局文件
listView = (ExpandableListView) findViewById(R.id.ExpandableListView);
adapter = new MyAdapter();// 实例化适配器
listView.setAdapter(adapter);
// 注册监听器--组
// 返回值需要为false,否则不执行展开动作
// * return 代表的意思:
// * true:代表事件自己处理
// * false: 代表这个事件 交给其他的监听处理
listView.setOnGroupClickListener(new OnGroupClickListener() {

@Override
public boolean onGroupClick(ExpandableListView arg0, View arg1,
int arg2, long arg3) {
Toast.makeText(MainActivity.this, "点击了分组", Toast.LENGTH_SHORT)
.show();
return false;
}
});
// 注册监听器---监听子元素,前提是子元素必须可以被选中,在adapter中设置
listView.setOnChildClickListener(new OnChildClickListener() {

@Override
public boolean onChildClick(ExpandableListView arg0, View arg1,
int arg2, int arg3, long arg4) {
Toast.makeText(MainActivity.this, "点击了", Toast.LENGTH_SHORT)
.show();
return true;
}
});
// 监听收缩分组
listView.setOnGroupCollapseListener(new OnGroupCollapseListener() {

@Override
public void onGroupCollapse(int arg0) {
Toast.makeText(MainActivity.this, "收起了分组", Toast.LENGTH_SHORT)
.show();

}
});

// 展开了分组
listView.setOnGroupExpandListener(new OnGroupExpandListener() {

@Override
public void onGroupExpand(int arg0) {
Toast.makeText(MainActivity.this, "展开了分组", Toast.LENGTH_SHORT)
.show();

}
});
}

/*
* 自定义一个适配器
*/
public class MyAdapter extends BaseExpandableListAdapter {

/*
* 获取下标为arg0的分组里下标为arg1的数据
*/
@Override
public Object getChild(int arg0, int arg1) {
// TODO Auto-generated method stub
return child[arg0][arg1];
}

@Override
public long getChildId(int arg0, int arg1) {
// TODO Auto-generated method stub
return arg1;
}

/**
* getChildView 子视图对象 int arg0:当前分组的下标 int arg1:子分组的下标 boolean
* arg2:是否是最后一个视图view View arg3:复用的视图 ViewGroup
* arg4:父控件ExpandableListView
*/
@Override
public View getChildView(int arg0, int arg1, boolean arg2, View arg3,
ViewGroup arg4) {
LayoutInflater inflater = getLayoutInflater();// 获取布局加载器
View view = inflater.inflate(R.layout.activity_child, null);// 加载布局
TextView tv = (TextView) view.findViewById(R.id.child);
tv.setText(child[arg0][arg1]);
return view;

}

/*
* 得到分组里面数据的个数
*/
@Override
public int getChildrenCount(int arg0) {
// TODO Auto-generated method stub
return child[arg0].length;
}

/*
* 获取下标为argo的分组的对象
*/
@Override
public Object getGroup(int arg0) {
// TODO Auto-generated method stub
return null;
}

/*
* 得到分组数量
*/
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return group.length;
}

/*
* 获取下标为arg0的分组的item
*/
@Override
public long getGroupId(int arg0) {
return arg0;
}

@Override
public View getGroupView(int arg0, boolean arg1, View arg2,
ViewGroup arg3) {
LayoutInflater inflater = getLayoutInflater();// 获取布局加载器
View view = inflater.inflate(R.layout.activity_group, null);// 加载布局
TextView tv = (TextView) view.findViewById(R.id.group);
tv.setText(group[arg0]);
return view;
}

/*
* 底层设计
*/
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}

/*
* 当前子元素是否被选中
*/
@Override
public boolean isChildSelectable(int arg0, int arg1) {
// TODO Auto-generated method stub
return true;
}

}
}

<RelativeLayout 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" >

<!-- 可折叠的listView -->

<ExpandableListView
android:id="@+id/ExpandableListView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

</RelativeLayout>

<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="vertical" >

<TextView
android:id="@+id/group"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:textColor="#00ff00"
android:layout_marginLeft="30dp"/>

</LinearLayout>

<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="vertical"
>

<TextView
android:id="@+id/child"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="40dp"
/>

</LinearLayout>