• 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 }
    路漫漫其修远兮 吾将上下而求索
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  • 原文地址：https://www.cnblogs.com/hudabing/p/3109888.html
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