QQ 添加分组 添加好友

package com.example.qq;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

import android.app.Activity;

import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.SimpleExpandableListAdapter;
import android.widget.TextView;

public class MainActivity extends Activity {

private final String GROUP = "group";
private final String CHILD = "child";

private ArrayList<HashMap<String, Object>> data;
private MyExpandableListAdapter mExpandableListAdapter;

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

// 分组的标签
String[] g = { "时光机", "好久不见", "黑色幽默", "甜甜的", "说好的幸福呢" };

data = new ArrayList<HashMap<String, Object>>();

// 子数据的计数
//int COUNT = 0;
//Random rand = new Random();
for (int i = 0; i < g.length; i++) {
HashMap<String, Object> map = new HashMap<String, Object>();
map.put(GROUP, g[i]);

ArrayList<String> child = new ArrayList<String>();
//int k = rand.nextInt(10);// 为每个子List随机生成k个测试数据

for (int j = 0; j < 5; j++) {
child.add("朋友" + j);
}
map.put(CHILD, child);
data.add(map);
}

ExpandableListView elv = (ExpandableListView) findViewById(R.id.expandableListView);
elv.setGroupIndicator(null);

// 这是一个参数为空或者null的ExpandableListAdapter
// 构造在子类中完成
mExpandableListAdapter = new MyExpandableListAdapter(
this, null, 0, null, null, null, 0, null, null);
elv.setAdapter(mExpandableListAdapter);

// 展开0组
//elv.expandGroup(0);
// 展开1组
//elv.expandGroup(1);
// 展开2组
//elv.expandGroup(2);

elv.setOnGroupClickListener(new OnGroupClickListener() {

@Override
public boolean onGroupClick(ExpandableListView arg0, View arg1,
int arg2, long arg3) {
// Android默认是返回false。
// 如果返回true，那么，不管是点击已展开的分组还是未展开的分组，都不会相应展开或者收缩的，也就是说这个ExpandableListView将成为一个‘死’的ListView
return false;
}
});

Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
addGroupData(2);
}

});

Button button2 = (Button) findViewById(R.id.button2);
button2.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
addChildData(1,"3");
}
});
}
private void addChildData(int pos,String str) {
HashMap<String,Object> map = data.get(pos);
ArrayList<String> list = (ArrayList<String>)map.get(CHILD);
list.add(2,str);

mExpandableListAdapter.notifyDataSetChanged();
}

private void addGroupData(int pos) {
HashMap<String,Object> map = new HashMap<String,Object>();
map.put(GROUP,"听妈妈的话");

ArrayList<String> child = new ArrayList<String>();
for(int j=0;j<5;j++){
child.add("朋友"+j);
}
map.put(CHILD,child);
//data.add(map);
data.add(pos,map);

mExpandableListAdapter.notifyDataSetChanged();
}

private class MyExpandableListAdapter extends SimpleExpandableListAdapter {
private LayoutInflater inflater;

public MyExpandableListAdapter(Context context,
List<? extends Map<String, ?>> groupData, int groupLayout,
String[] groupFrom, int[] groupTo,
List<? extends List<? extends Map<String, ?>>> childData,
int childLayout, String[] childFrom, int[] childTo) {

super(context, groupData, groupLayout, groupFrom, groupTo,
childData, childLayout, childFrom, childTo);

inflater = LayoutInflater.from(context);
}

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

ArrayList<String> items = (ArrayList<String>) data.get(groupPosition).get(CHILD);
return items.get(childPosition);
}

@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
View view = inflater.inflate(android.R.layout.simple_list_item_1,
null);
TextView text = (TextView) view.findViewById(android.R.id.text1);
text.setText(getChild(groupPosition, childPosition) + "");
return view;
}

@Override
public int getChildrenCount(int groupPosition) {
ArrayList<String> items = (ArrayList<String>) data.get(groupPosition).get(CHILD);
return items.size();
}

@Override
public Object getGroup(int groupPosition) {
return data.get(groupPosition).get(GROUP);
}

@Override
public int getGroupCount() {
return data.size();
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
View view = inflater.inflate(android.R.layout.simple_list_item_1,
null);
TextView text = (TextView) view.findViewById(android.R.id.text1);
text.setText(getGroup(groupPosition) + "");
view.setBackgroundColor(Color.RED);
return view;
}
}
}

<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"
tools:context="com.example.qq.MainActivity" >

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="添加分组" />

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="添加朋友"
/>
</LinearLayout>

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

</LinearLayout>