android ExpandableListView详解

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：

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

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

03
 
04
setSelectedChild (int groupPosition, int childPosition, boolean shouldExpandGroup);//设置选择指定的子项。

05
 
06
getPackedPositionGroup (long packedPosition);//返回所选择的组

07
 
08
getPackedPositionForChild (int groupPosition, int childPosition) ;//返回所选择的子项

09
 
10
getPackedPositionType (long packedPosition);//返回所选择项的类型（Child,Group）

11
 
12
isGroupExpanded (int groupPosition);//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
<?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>

001
package com.test;

002
 
003
import java.util.ArrayList;

004
import java.util.List;

005
 
006
import javax.security.auth.PrivateCredentialPermission;

007
 
008
import android.app.Activity;

009
import android.os.Bundle;

010
import android.view.Gravity;

011
import android.view.View;

012
import android.view.ViewGroup;

013
import android.view.Window;

014
import android.widget.AbsListView;

015
import android.widget.BaseExpandableListAdapter;

016
import android.widget.ExpandableListView;

017
import android.widget.TextView;

018
 
019
public class ExpandableListViewDemo extends Activity {

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
    public void 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 =new ArrayList<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
        public Object getGroup(int groupPosition) {

091
            // TODO Auto-generated method stub

092
            return getGroup(groupPosition);

093
        }

094
 
095
        @Override

096
        public int getGroupCount() {

097
            // TODO Auto-generated method stub

098
            return groupArray.size();

099
        }

100
 
101
        @Override

102
        public long getGroupId(int groupPosition) {

103
            // TODO Auto-generated method stub

104
            return groupPosition;

105
        }

106
 
107
        @Override

108
        public View getGroupView(int groupPosition, boolean isExpanded,

109
                View convertView, ViewGroup parent) {

110
             
111
           String   string=groupArray.get(groupPosition);

112
           return getGenericView(string);

113
        }

114
 
115
        @Override

116
        public boolean hasStableIds() {

117
            // TODO Auto-generated method stub

118
            return false;

119
        }

120
 
121
        @Override

122
        public boolean isChildSelectable(int groupPosition, int childPosition)

123
        {

124
            // TODO Auto-generated method stub

125
            return true;

126
        }

127
         
128
        private TextView  getGenericView(String string )

129
        {

130
              AbsListView.LayoutParams  layoutParams =new AbsListView.LayoutParams(

131
                    ViewGroup.LayoutParams.MATCH_PARENT,

132
                    ViewGroup.LayoutParams.WRAP_CONTENT);

133
               
134
              TextView  textView =new TextView(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
              return textView;

142
         }

143
    }

144
     
145
    private void 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
    private void addInfo(String group,String []child) {

151
         
152
        groupArray.add(group);

153
         
154
        List<String>  childItem =new ArrayList<String>();

155
         
156
        for(int index=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(int index=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
<?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
     <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
<?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
     <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

001
package com.test;

002
 
003
import java.util.ArrayList;

004
import java.util.HashMap;

005
import java.util.List;

006
import java.util.Map;

007
 
008
import javax.security.auth.PrivateCredentialPermission;

009
 
010
import com.test.R;

011
import com.test.ExpandableListViewDemo.ExpandableListViewaAdapter;

012
import com.test.R.id;

013
import com.test.R.layout;

014
 
015
import android.app.Activity;

016
import android.os.Bundle;

017
import android.view.Gravity;

018
import android.view.View;

019
import android.view.ViewGroup;

020
import android.view.Window;

021
import android.widget.AbsListView;

022
import android.widget.BaseExpandableListAdapter;

023
import android.widget.ExpandableListView;

024
import android.widget.SimpleExpandableListAdapter;

025
import android.widget.TextView;

026
 
027
public class ExpandableListViewDemo_two extends Activity {

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

029
    private  ExpandableListView  expandableListView_one;

030
    @Override  

031
    public void 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"}, newint[]{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
    private OnChildClickListener  listener =new OnChildClickListener() {

101
   @Override

102
  public boolean onChildClick(ExpandableListView parent, View v,

103
    int groupPosition, int childPosition, long id) {

104
   // TODO Auto-generated method stub

105
   toast("点击了");

106
   return false;

107
  }

108
 };

109
 private void 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：

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

02
        int len = 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：

01
public class MyExpandableListAdapter extends BaseExpandableListAdapter{

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

03
                int len = to.length;

04
                boolean isBound = false;

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

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

07
                 if (v!=null) {

08
                final Object _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
}

来源：https://www.cnblogs.com/hudabing/archive/2013/05/31/3109888.html

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