Android开发：BaseExpandableListAdapter的使用

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项目需要展示一个通讯簿，通讯簿中的手机号码是分组的，要求勾选组时，自动勾选组下的手机号码，实现效果如下：

下面是实现步骤。

1、新建类PhoneListItem，用于表示分组中的每一个手机号码。

package com.ydtf.android;

public class PhoneListItem {

public String phone,name;

public boolean checked;

public PhoneListItem(String _name,String _phone,boolean _checked){

name=_name;

phone=_phone;

checked=_checked;

}

2、新建布局文件phone_list_item.xml，用于定义分组下面的每一条手机记录的页面布局。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent" android:layout_height="wrap_content"

android:orientation="horizontal" android:minHeight="40px"

android:layout_gravity="center_vertical">

<CheckBox android:id="@+id/phone_check" android:focusable="false"

android:layout_width="wrap_content" android:layout_height="wrap_content"

android:layout_marginLeft="35px" android:checked="false"/>

<TextView android:id="@+id/phone_name" android:layout_width="80dip"

android:layout_height="wrap_content" android:layout_gravity="center_vertical" />

<TextView android:id="@+id/phone_number" android:layout_width="wrap_content"

android:layout_height="wrap_content" android:textColor="?android:attr/textColorPrimary"

android:paddingLeft="10px" android:layout_gravity="center_vertical" />

</LinearLayout>

3、新建类PhoneGroup，用于表示一个分组。

import java.util.List;

public class PhoneGroup {

public String title;

private boolean checked;

public List<PhoneListItem> children;

public PhoneGroup(String title,boolean checked,List<PhoneListItem> children){

this.title=title;

setChecked(checked);

this.children=children;

}

public boolean getChecked(){

return checked;

}

public void setChecked(boolean b){

checked=b;

if(children!=null&&children.size()>0){//若children不为空，循环设置children的checked

for(PhoneListItem each : children){

each.checked=checked;

}

4、新建Activity布局文件phone_browser.xml，用于定义通讯簿的展现页面。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent" android:layout_height="fill_parent"

android:orientation="vertical">

<ExpandableListView android:id="@+id/phonelist"

android:layout_width="fill_parent" android:layout_height="0dip"

android:layout_weight="1" />

</LinearLayout>

5、新建类QxtPhoneSelect，用于呈现通讯簿的Activity页面。

package com.ydtf.android;

import java.util.ArrayList;

import java.util.List;

import com.ydtf.android.PhoneGroupAdapter.ExpandableListHolder;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.ExpandableListView;

public class QxtSelectPhone extends Activity implements

ExpandableListView.OnGroupClickListener,ExpandableListView.OnChildClickListener{

private List<PhoneGroup> groups;

private PhoneGroupAdapter exlist_adapter = null;

private ExpandableListView exlist;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//加载layout

setContentView(R.layout.phone_browser);

//取得listview

exlist = (ExpandableListView) findViewById(R.id.phonelist);

//调用init方法，这个方法主要是,初始化一些数据

init();

//构建expandablelistview的适配器

exlist_adapter = new PhoneGroupAdapter(this, groups);

exlist.setOnChildClickListener(this);

exlist.setAdapter(exlist_adapter); //绑定视图－适配器

}

private void init() {

groups = new ArrayList<PhoneGroup>();

//构建List用作group1的子项

List<PhoneListItem> group1_children = new ArrayList<PhoneListItem>();

//往List中添加内容

PhoneListItem item = new PhoneListItem("和文明","1308763994", false);

group1_children.add(item);

item = new PhoneListItem("黄文明","1308763994", false);

group1_children.add(item);

item = new PhoneListItem("王文明","1308763994", false);

group1_children.add(item);

//拼装成 PhoneGroup

PhoneGroup phonegroup1=new PhoneGroup("group1",false,group1_children);

//------把前面的代码复制一遍，再添加一个组group2

//构建List用作group2的子项

List<PhoneListItem> group2_children = new ArrayList<PhoneListItem>();

//往List中添加内容

item = new PhoneListItem("张文明","1589065423", false);

group2_children.add(item);

item = new PhoneListItem("李文明","1589065423", false);

group2_children.add(item);

item = new PhoneListItem("赵文明","1589065423", false);

group2_children.add(item);

//拼装成 PhoneGroup

PhoneGroup phonegroup2=new PhoneGroup("group2",false,group2_children);

//添加进groups数组

groups.add(phonegroup1);

groups.add(phonegroup2);

}

//当分组行背点击时，让分组呈现“选中／取消选中”状态。

@Override

public boolean onChildClick(ExpandableListView parent, View v,

int groupPosition, int childPosition, long id) {

PhoneGroupAdapter.ExpandableListHolder holder=(ExpandableListHolder) v.getTag();

holder.chkChecked.setChecked(!holder.chkChecked.isChecked());

groups.get(groupPosition).children.get(childPosition).checked=

!groups.get(groupPosition).children.get(childPosition).checked;

return false;

}

@Override

public boolean onGroupClick(ExpandableListView parent, View v,

int groupPosition, long id) {

//groups.get(groupPosition).setChecked(!groups.get(groupPosition).getChecked());

//exlist_adapter.notifyDataSetChanged();

return false;

}

6、新建类PhoneGroupAdapter，实现BaseExpandableListAdapter。

package com.ydtf.android;

import java.util.List;

import android.content.Context;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.BaseExpandableListAdapter;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.CompoundButton;

import android.widget.CompoundButton.OnCheckedChangeListener;

import android.widget.TextView;

public class PhoneGroupAdapter extends BaseExpandableListAdapter {

class ExpandableListHolder { //定义一个内部类，用于保存listitem的3个子视图引用,2个textview和1个checkbox

TextView tvName;

TextView tvPhone;

CheckBox chkChecked;

}

private Context context; //父activity

private LayoutInflater mChildInflater; //用于加载listitem的布局xml

private LayoutInflater mGroupInflater; //用于加载group的布局xml

private List<PhoneGroup> groups; //所有group

//构造方法：参数c － activity，参数group －所有group

public PhoneGroupAdapter(Context c,List<PhoneGroup> groups){

context=c;

mChildInflater = (LayoutInflater) context

.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

mGroupInflater = (LayoutInflater) context

.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

this.groups = groups;

}

@Override

public Object getChild(int arg0, int arg1) {//根据组索引和item索引，取得listitem// TODO Auto-generated method stub

return groups.get(arg0).children.get(arg1);

}

@Override

public long getChildId(int arg0, int arg1) {//返回item索引

return arg1;

}

@Override

public int getChildrenCount(int groupPosition) {//根据组索引返回分组的子item数

return groups.get(groupPosition).children.size();

}

@Override

public Object getGroup(int groupPosition) {//根据组索引返回组

return groups.get(groupPosition);

}

@Override

public int getGroupCount() {//返回分组数

return groups.size();

}

@Override

public long getGroupId(int groupPosition) {//返回分组索引

return groupPosition;

}

@Override

public View getGroupView(int position, boolean isExpanded,

View view, ViewGroup parent) {//根据组索引渲染"组视图"

ExpandableListHolder holder = null; //清空临时变量holder

if (view == null) { //判断view（即view是否已构建好）是否为空

//若组视图为空，构建组视图。注意flate的使用，R.layout.browser_expandable_list_item代表了

//已加载到内存的browser_expandable_list_item.xml文件

view = mGroupInflater.inflate(

R.layout.phone_list_item, null);

//下面主要是取得组的各子视图，设置子视图的属性。用tag来保存各子视图的引用

holder = new ExpandableListHolder();

//从view中取得textView

holder.tvName = (TextView) view.findViewById(R.id.phone_name);

//从view中取得textview

holder.tvPhone = (TextView) view.findViewById(R.id.phone_number);

//从view中取得checkbox

holder.chkChecked = (CheckBox) view

.findViewById(R.id.phone_check);

// holder.chkChecked.setEnabled(false);//禁用checkbox

//把checkbox、textview的引用保存到组视图的tag属性中

view.setTag(holder);

} else { //若view不为空，直接从view的tag属性中获得各子视图的引用

holder = (ExpandableListHolder) view.getTag();

}

//对应于组索引的组数据（模型）

PhoneGroup info = this.groups.get(position);

if (info != null) {

//根据模型值设置textview的文本

holder.tvName.setText(info.title);

//根据模型值设置checkbox的checked属性

holder.chkChecked.setChecked(info.getChecked());

holder.chkChecked.setTag(info);

holder.chkChecked.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

PhoneGroup group=(PhoneGroup)v.getTag();

group.setChecked(!group.getChecked());

notifyDataSetChanged();

}

});

}

// TODO Auto-generated method stub

return view;

}

//行渲染方法

@Override

public View getChildView(int groupPosition, int childPosition,

boolean isLastChild, View convertView, ViewGroup parent) {

ExpandableListHolder holder = null; //清空临时变量

if (convertView == null) { //若行未初始化

//通过flater初始化行视图

convertView = mChildInflater.inflate(

R.layout.phone_list_item, null);

//并将行视图的3个子视图引用放到tag中

holder = new ExpandableListHolder();

holder.tvName = (TextView) convertView

.findViewById(R.id.phone_name);

holder.tvPhone = (TextView) convertView.findViewById(R.id.phone_number);

holder.chkChecked = (CheckBox) convertView

.findViewById(R.id.phone_check);

// holder.chkChecked.setEnabled(false);

convertView.setTag(holder);

} else { //若行已初始化，直接从tag属性获得子视图的引用

holder = (ExpandableListHolder) convertView.getTag();

}

//获得行数据（模型）

PhoneListItem info = this.groups.get(groupPosition)

.children.get(childPosition);

if (info != null) {

//根据模型数据，设置行视图的控件值

holder.tvName.setText(info.name);

holder.tvPhone.setText(info.phone);

holder.chkChecked.setChecked(info.checked);

holder.chkChecked.setTag(info);

holder.chkChecked.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

CheckBox check=(CheckBox)v;

PhoneListItem item=(PhoneListItem)v.getTag();

item.checked=!item.checked;

//check.setChecked(!check.isChecked());

}

});

}

return convertView;

}

@Override

public boolean hasStableIds() {//行是否具有唯一id

return false;

}

@Override

public boolean isChildSelectable(int groupPosition, int childPosition) {//行是否可选

return true;

}