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项目中需要类似qq好友的通讯录，所以就写了一个简单的例子，分享一下。 效果： 1、MainActivity.java的代码：
package com.tbx.android;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ExpandableListView;
public class MainActivity extends Activity {
ExpendAdapter adapter;
ExpandableListView exList;
private List<GroupElement> parentList = new ArrayList<GroupElement>();
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
exList = (ExpandableListView) this.findViewById(R.id.expandableListView1);
initData();
adapter = new ExpendAdapter(MainActivity.this, parentList);
exList.setAdapter(adapter);
exList.setGroupIndicator(null);
exList.setDivider(null);
}
private void initData() {
GroupElement group1 = new GroupElement();
ChildElement childElement = new ChildElement();
childElement.setMood("我喜欢王");
childElement.setResoureid(R.drawable.f009);
childElement.setTitle("小鸟");
group1.putChildElement(childElement);
childElement = new ChildElement();
childElement.setMood("我喜欢王");
childElement.setResoureid(R.drawable.f010);
childElement.setTitle("android");
group1.putChildElement(childElement);
group1.setTitle("我的好友");
parentList.add(group1);
GroupElement group2 = new GroupElement();
childElement = new ChildElement();
childElement.setMood("我喜欢王");
childElement.setResoureid(R.drawable.f009);
childElement.setTitle("小鸟");
group2.putChildElement(childElement);
childElement = new ChildElement();
childElement.setMood("我喜欢王");
childElement.setResoureid(R.drawable.f010);
childElement.setTitle("android");
group2.putChildElement(childElement);
group2.setTitle("高中同学");
parentList.add(group2);
}
} 2、ExpendAdapter.java 代码：
package com.tbx.android;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.*;
public class ExpendAdapter extends BaseExpandableListAdapter {
private LayoutInflater layoutInflater;
private Context mContext;
private List<GroupElement> parentList = new ArrayList<GroupElement>();
public ExpendAdapter(Context mContext,List<GroupElement> parentList){
this.mContext = mContext;
this.parentList = parentList;
layoutInflater = LayoutInflater.from(mContext);
}
public Object getChild(int groupPosition, int childPosition) {
GroupElement group = parentList.get(groupPosition);
if(group!=null){
return group.getChildElement(childPosition);
}
return null;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
if(convertView ==null){
convertView = layoutInflater.inflate(R.layout.child, null);
}
GroupElement groupElement = parentList.get(groupPosition);
ChildElement childElement = groupElement.getChildElement(childPosition);
if(childElement == null){
return null ;
}
final ImageView head=(ImageView)convertView.findViewById(R.id.headImage);
head.setImageResource(childElement.getResoureid());
final TextView title=(TextView)convertView.findViewById(R.id.title);
title.setText(childElement.getTitle());
final TextView mood =(TextView)convertView.findViewById(R.id.mood);
mood.setText(childElement.getMood());
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
GroupElement group = parentList.get(groupPosition);
if(group!=null){
return group.getChildSize();
}
return 0;
}
@Override
public Object getGroup(int groupPosition) {
return parentList.get(groupPosition);
}
@Override
public int getGroupCount() {
return parentList.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
if(convertView==null){
convertView=layoutInflater.inflate(R.layout.parent, null);
}
final TextView user_group_name = (TextView) convertView.findViewById(R.id.user_group_name);
user_group_name.setText(parentList.get(groupPosition).getTitle());
final TextView user_group_size = (TextView) convertView.findViewById(R.id.user_group_size);
int size = parentList.get(groupPosition).getChildSize();
user_group_size.setText("["+size+"]");
final ImageView imageView = (ImageView) convertView.findViewById(R.id.user_group);
if(isExpanded){
imageView.setBackgroundResource(R.drawable.group_unfold_arrow);
}else{
imageView.setBackgroundResource(R.drawable.group_fold_arrow);
}
return convertView;
}
@Override
public void onGroupCollapsed(int groupPosition) {
super.onGroupCollapsed(groupPosition);
}
@Override
public void onGroupExpanded(int groupPosition) {
super.onGroupExpanded(groupPosition);
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
Toast.makeText(mContext, "这是第"+groupPosition+"组，第"+childPosition+"个", Toast.LENGTH_SHORT).show();
return true;
}
} 3、GroupElement.java 代码：
package com.tbx.android;
import java.util.ArrayList;
public class GroupElement {
private String title ;
private String img ;
private List<ChildElement> childList = new ArrayList<ChildElement>();
public ChildElement getChildElement(int childPosition){
return childList.get(childPosition);
}
public void putChildElement(ChildElement childElement){
childList.add(childElement);
}
public int getChildSize(){
return childList.size();
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getImg() {
return img;
}
public void setImg(String img) {
this.img = img;
}
public List<ChildElement> getChildList() {
return childList;
}
public void setChildList(List<ChildElement> childList) {
this.childList = childList;
}
} 4、ChildElement.java代码：
public class ChildElement {
private String title ;
private boolean isOnline ;
private int resoureid; //显示图片的资源id
private String mood ; //心情
....
} 5、main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/back1"
>
<ExpandableListView
android:id="@+id/expandableListView1"
android:layout_height="wrap_content"
android:layout_width="fill_parent">
</ExpandableListView>
</LinearLayout> 6、parent.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:orientation="horizontal"
android:id="@+id/parentList"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/user_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/user_group_name"
android:textSize="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/user_group_size"
android:textSize="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout> 7、child.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/childList"
android:orientation="horizontal"
>
<ImageView
android:paddingLeft="20px"
android:id="@+id/headImage"
android:src="@drawable/f009"
android:layout_width="50px"
android:layout_height="50px"
android:layout_marginBottom="5px"
android:layout_marginRight="10px"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView android:id="@+id/title"
android:textSize="18px"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView android:id="@+id/mood"
android:textSize="16px"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
这是所有的主要代码，至于图片我就不上除了，如果那位同学想看看，可以留言。后面会对ExpandableListView详细分析 |
