android ExpandableListView详解

转自http://my.oschina.net/amigos/blog/62614

ExpandableListView是android中可以实现下拉list的一个控件，是一个垂直滚动的心事两个级别列表项手风琴试图，列表项是来自ExpandableListViewaAdapter，组可以单独展开。

重要方法：

01expandGroup (intgroupPos) ;//在分组列表视图中 展开一组，

02setSelectedGroup (intgroupPosition) ;//设置选择指定的组。

03 

04setSelectedChild (intgroupPosition, int childPosition, boolean shouldExpandGroup);//设置选择指定的子项。

05 

06getPackedPositionGroup (longpackedPosition);//返回所选择的组

07 

08getPackedPositionForChild (intgroupPosition, int childPosition) ;//返回所选择的子项

09 

10getPackedPositionType (longpackedPosition);//返回所选择项的类型（Child,Group）

11 

12isGroupExpanded (intgroupPosition);//判断此组是否展开

 expandableListView.setDivider();这个是设定每个Group之间的分割线。

  expandableListView.setGroupIndicator();这个是设定每个Group之前的那个图标。

  expandableListView.collapseGroup(int group); 将第group组收起

ExpandableListAdapter

一个接口，将基础数据链接到一个ExpandableListView。 此接口的实施将提供访问Child的数据（由组分类），并实例化的Child和Group。

1.重要方法

　　　　getChildId (int groupPosition, int childPosition) 获取与在给定组给予孩子相关的数据。

　　　　getChildrenCount (int groupPosition) 返回在指定Group的Child数目。

案例：

首先定义个一个布局文件expandablelistview.xml

 

01<?xmlversion="1.0"encoding="utf-8"?>

02<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

03    android:layout_width="fill_parent"

04    android:layout_height="fill_parent"

05    android:orientation="vertical">

06     <ExpandableListView

07        android:id="@+id/expandableListView"  

08        android:layout_width="fill_parent"  

09        android:layout_height="wrap_content"  

10        >

11     </ExpandableListView>

12</LinearLayout>

 

 

001package com.test;

002 

003import java.util.ArrayList;

004import java.util.List;

005 

006import javax.security.auth.PrivateCredentialPermission;

007 

008import android.app.Activity;

009import android.os.Bundle;

010import android.view.Gravity;

011import android.view.View;

012import android.view.ViewGroup;

013import android.view.Window;

014import android.widget.AbsListView;

015import android.widget.BaseExpandableListAdapter;

016import android.widget.ExpandableListView;

017import android.widget.TextView;

018 

019public classExpandableListViewDemo extendsActivity {

020    /** Called when the activity is first created. */

021     

022    //定义两个List用来控制Group和Child中的String;

023     

024    private List<String>  groupArray;//组列表

025    private List<List<String>> childArray;//子列表

026    private ExpandableListView  expandableListView_one;

027     

028    @Override

029    publicvoid onCreate(Bundle savedInstanceState) {

030        super.onCreate(savedInstanceState);

031//        requestWindowFeature(Window.FEATURE_NO_TITLE);  //设置为无标题 

032        setContentView(R.layout.expandablelistview);

033        expandableListView_one =(ExpandableListView)findViewById(R.id.expandableListView);

034        groupArray =newArrayList<String>();

035        childArray =new ArrayList<List<String>>();

036        

037        /*-第一季-*/

038        initdate();

039        expandableListView_one.setAdapter(new ExpandableListViewaAdapter(ExpandableListViewDemo.this));

040         

041        /*-第二季-*/

042//        groupArray.add("移动开发");

043//        List<String> arrayList = new ArrayList<String>();

044//        arrayList.add("Android");

045//        arrayList.add("IOS");

046//        arrayList.add("Windows Phone");

047//        //组循环

048//        for(int index=0;index<groupArray.size();++index)

049//        {

050//          childArray.add(arrayList);

051//        }

052//        expandableListView_one.setAdapter(new ExpandableListViewaAdapter(ExpandableListViewDemo.this));

053         

054    }

055    class ExpandableListViewaAdapter extends BaseExpandableListAdapter {

056        Activity activity;

057         public  ExpandableListViewaAdapter(Activity a) 

058            { 

059                activity = a; 

060            } 

061       /*-----------------Child */

062        @Override

063        public Object getChild(int groupPosition, int childPosition) {

064            // TODO Auto-generated method stub

065            return childArray.get(groupPosition).get(childPosition);

066        }

067 

068        @Override

069        public long getChildId(int groupPosition, int childPosition) {

070            // TODO Auto-generated method stub

071            return childPosition;

072        }

073 

074        @Override

075        public View getChildView(int groupPosition, int childPosition,

076                boolean isLastChild, View convertView, ViewGroup parent) {

077             

078            String string =childArray.get(groupPosition).get(childPosition);

079             

080            return getGenericView(string);

081        }

082 

083        @Override

084        public int getChildrenCount(int groupPosition) {

085            // TODO Auto-generated method stub

086            return childArray.get(groupPosition).size();

087        }

088       /* ----------------------------Group */

089        @Override

090        publicObject getGroup(int groupPosition) {

091            // TODO Auto-generated method stub

092            returngetGroup(groupPosition);

093        }

094 

095        @Override

096        publicint getGroupCount() {

097            // TODO Auto-generated method stub

098            returngroupArray.size();

099        }

100 

101        @Override

102        publiclong getGroupId(intgroupPosition) {

103            // TODO Auto-generated method stub

104            returngroupPosition;

105        }

106 

107        @Override

108        publicView getGroupView(int groupPosition, boolean isExpanded,

109                View convertView, ViewGroup parent) {

110             

111           String   string=groupArray.get(groupPosition);

112           returngetGenericView(string);

113        }

114 

115        @Override

116        publicboolean hasStableIds() {

117            // TODO Auto-generated method stub

118            returnfalse;

119        }

120 

121        @Override

122        publicboolean isChildSelectable(intgroupPosition, int childPosition)

123        {

124            // TODO Auto-generated method stub

125            returntrue;

126        }

127         

128        privateTextView  getGenericView(String string )

129        {

130              AbsListView.LayoutParams  layoutParams =newAbsListView.LayoutParams(

131                    ViewGroup.LayoutParams.MATCH_PARENT,

132                    ViewGroup.LayoutParams.WRAP_CONTENT);

133               

134              TextView  textView =newTextView(activity);

135              textView.setLayoutParams(layoutParams);

136               

137              textView.setGravity(Gravity.CENTER_VERTICAL |Gravity.LEFT);

138               

139              textView.setPadding(40,0, 0,0);

140              textView.setText(string);

141              returntextView;

142         }

143    }

144     

145    privatevoid initdate()

146    {

147        addInfo("语言",new String[]{"Oracle","Java","Linux","Jquery"});

148        addInfo("男人的需求",new String[]{"金钱","事业","权力","女人","房子","车","球"});

149    }

150    privatevoid addInfo(String group,String []child) {

151         

152        groupArray.add(group);

153         

154        List<String>  childItem =newArrayList<String>();

155         

156        for(intindex=0;index<child.length;index++)

157        {

158            childItem.add(child[index]);

159        }

160         childArray.add(childItem);

161    }

162}

运行效果：

注释修改如下代码：

01/*-第一季-*/

02//        initdate();

03//        expandableListView_one.setAdapter(new ExpandableListViewaAdapter(ExpandableListViewDemo.this));

04         

05        /*-第二季-*/

06        groupArray.add("移动开发");

07        List<String> arrayList =new ArrayList<String>();

08        arrayList.add("Android");

09        arrayList.add("IOS");

10        arrayList.add("Windows Phone");

11        //组循环

12        for(intindex=0;index<groupArray.size();++index)

13        {

14            childArray.add(arrayList);

15        }

16        expandableListView_one.setAdapter(newExpandableListViewaAdapter(ExpandableListViewDemo.this));

 运行效果：

★★★★★★★★★★★★★★★★★★★★

案例二：

1.定义一个主界面expandablelistview.xml

01<?xml version="1.0"encoding="utf-8"?>

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

03    android:layout_width="fill_parent"

04    android:layout_height="fill_parent"

05    android:orientation="vertical">

06     <ExpandableListView

07        android:id ="@+id/expandableListView"  

08        android:layout_width ="fill_parent"  

09        android:layout_height ="wrap_content"  

10        >

11     </ExpandableListView>

12</LinearLayout>

2.在res/drawable目录下创建样式文件expandablelistview_groups.xml该界面是组界面：

01<?xmlversion="1.0"encoding="utf-8"?>

02<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

03    android:layout_width="fill_parent"

04    android:layout_height="fill_parent"

05    android:orientation="vertical">

06     <TextView

07        android:id="@+id/textGroup"  

08        android:layout_width="fill_parent"  

09        android:layout_height="fill_parent"  

10        android:paddingLeft="40px"  

11        android:paddingTop="6px"  

12        android:paddingBottom="6px"  

13        android:textSize="15sp"  

14        android:text="No data"  

15    >  

16    </TextView>

17</LinearLayout>

3.在res/drawable目录下创建样式文件expandablelistview_child.xml；是子控件，直接显示列表内容

01<?xmlversion="1.0"encoding="utf-8"?>

02<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

03    android:layout_width="fill_parent"

04    android:layout_height="fill_parent"

05    android:orientation="vertical">

06     <TextView    

07        android:id="@+id/textChild"  

08        android:layout_width="fill_parent"   

09        android:layout_height="fill_parent"   

10        android:paddingLeft="60px"  

11        android:paddingTop="10px"  

12        android:paddingBottom="10px"  

13        android:textSize="20sp"  

14        android:text="No Data"/> 

15</LinearLayout>

定义java文件：ExpandableListViewDemo_two.java

 

001package com.test;

002 

003import java.util.ArrayList;

004import java.util.HashMap;

005import java.util.List;

006import java.util.Map;

007 

008import javax.security.auth.PrivateCredentialPermission;

009 

010import com.test.R;

011import com.test.ExpandableListViewDemo.ExpandableListViewaAdapter;

012import com.test.R.id;

013import com.test.R.layout;

014 

015import android.app.Activity;

016import android.os.Bundle;

017import android.view.Gravity;

018import android.view.View;

019import android.view.ViewGroup;

020import android.view.Window;

021import android.widget.AbsListView;

022import android.widget.BaseExpandableListAdapter;

023import android.widget.ExpandableListView;

024import android.widget.SimpleExpandableListAdapter;

025import android.widget.TextView;

026 

027public classExpandableListViewDemo_two extendsActivity {

028    /** Called when the activity is first created. */  

029    private ExpandableListView  expandableListView_one;

030    @Override  

031    publicvoid onCreate(Bundle savedInstanceState)  

032    {  

033        super.onCreate(savedInstanceState);  

034        setContentView(R.layout.expandablelistview);  

035        expandableListView_one =(ExpandableListView)findViewById(R.id.expandableListView);  

036        //创建二个一级条目标题   

037        Map<String, String> title_1 =new HashMap<String, String>();  

038        Map<String, String> title_2 =new HashMap<String, String>();  

039            

040        title_1.put("group","移动开发");  

041        title_2.put("group","男人的需求");  

042            

043        //创建一级条目容器   

044        List<Map<String, String>> gruops =new ArrayList<Map<String,String>>();  

045            

046        gruops.add(title_1);  

047        gruops.add(title_2);  

048            

049        //创建二级条目内容   

050            

051        //内容一   

052        Map<String, String> content_1 =new HashMap<String, String>();  

053        Map<String, String> content_2 =new HashMap<String, String>();  

054            

055        content_1.put("child","ANDROID");  

056        content_2.put("child","IOS");  

057            

058        List<Map<String, String>> childs_1 =new ArrayList<Map<String,String>>();  

059        childs_1.add(content_1);  

060        childs_1.add(content_2);  

061            

062        //内容二   

063        Map<String, String> content_3 =new HashMap<String, String>();  

064        Map<String, String> content_4 =new HashMap<String, String>(); 

065        Map<String, String> content_5 =new HashMap<String, String>();

066            

067        content_3.put("child","金钱");  

068        content_4.put("child","权力");  

069        content_5.put("child","女人");

070        List<Map<String, String>> childs_2 =new ArrayList<Map<String,String>>();  

071        childs_2.add(content_3);  

072        childs_2.add(content_4); 

073        childs_2.add(content_5);

074            

075        //存放两个内容, 以便显示在列表中   

076        List<List<Map<String, String>>> childs =new ArrayList<List<Map<String,String>>>();  

077        childs.add(childs_1);  

078        childs.add(childs_2);  

079            

080        //创建ExpandableList的Adapter容器   

081/** 

082* 使用SimpleExpandableListAdapter显示ExpandableListView 

083* 参数1.上下文对象Context 

084* 参数2.一级条目目录集合 

085* 参数3.一级条目对应的布局文件 （expandablelistview_groups.xml文件

086* 参数4.fromto，就是map中的key，指定要显示的对象 

087* 参数5.与参数4对应，指定要显示在groups中的id 

088* 参数6.二级条目目录集合 

089* 参数7.二级条目对应的布局文件 

090* 参数9.与参数8对应，指定要显示在childs中的id 

091/           SimpleExpandableListAdapter adapter =new SimpleExpandableListAdapter(  

092                this, gruops, R.drawable.expandablelistview_groups,new String[]{"group"},new int[]{R.id.textGroup},   

093                childs, R.drawable.expandablelistview_child,new String[]{"child"},new int[]{R.id.textChild}  

094                );  

095            

096        //加入列表   

097        expandableListView_one.setAdapter(adapter);

098     expandableListView_one.setOnChildClickListener(listener);

099    }  

100    privateOnChildClickListener  listener =newOnChildClickListener() {

101   @Override

102  publicboolean onChildClick(ExpandableListView parent, View v,

103    intgroupPosition, int childPosition, long id) {

104   // TODO Auto-generated method stub

105   toast("点击了");

106   returnfalse;

107  }

108 };

109 privatevoid toast(String str) {

110 Toast.makeText(this, str, Toast.LENGTH_LONG).show(); 

111 }

112}

 上面的样式也可以使用系统的自带的样式如下：

android.R.layout.simple_expandable_list_item_1,//层显示样式 ，系统自定义  

android.R.layout.simple_expandable_list_item_2,  

运行效果：

案例三：如果group中有个ImageVIew将会是什么情况呢？

在SimpleExpandableListAdapter中有如下方法：

01private voidbindView(View view, Map<String, ?> data, String[] from, int[] to) {

02        intlen = to.length;

03 

04        for(int i = 0; i < len; i++) {

05            TextView v = (TextView)view.findViewById(to[i]);

06            if(v != null) {

07                v.setText((String)data.get(from[i]));

08            }

09        }

10    }

从上面的方法中可以看出 SimpleExpandableListAdapter把所以的View都当成TextView来处理了，而不像SimpleAdapter可以自动判断View的类型,自动绑定，解决版本就是重写bingview回调一下试试：

 

01public classMyExpandableListAdapter extendsBaseExpandableListAdapter{

02        privatevoid bindView(View view, Map<String, ?> data, String[] from,int[] to) {

03                intlen = to.length;

04                booleanisBound = false;

05                for(int i = 0; i < len; i++) {

06                   finalView v = view.findViewById(to[i]);

07                 if(v!=null) {

08                finalObject _data = data.get(from[i]);

09                String text = _data ==null ? "": data.toString();

10                if(text == null) {

11                    text ="";

12                }

13                          if(mViewBinder != null) {//如果Binder不为空,使用Binder进行处理

14                                        isBound = mViewBinder.setViewValue(v, data.get(from[i]), text);

15                                }

16                                if(!isBound) {//如果Binder跳过,使用原来的方法进行处理

17                                        TextView _v = (TextView)v;

18                                        _v.setText((String)data.get(from[i]));

19                                }                              

20                        }

21                }

22        }

23}