ExpandableListView的简单例子-白红宇

ExpandableListView的简单例子

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发布时间：2019-05-25

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最近一段时间参考网上的例子，做了一下简单的 ExpandableListView，现在和大家共享一下：

1：main.xml的内容

[html]
 <?xml version="1.0" encoding="utf-8"?>  
 <LinearLayout     
      xmlns:android="http://schemas.android.com/apk/res/android"  
      android:id="@+id/linearLayout"    
      android:layout_width="fill_parent"     
      android:layout_height="fill_parent"    
      androidrientation="vertical"    
      >    
          
      <ExpandableListView    
      android:id="@+id/expandableListView"    
      android:layout_width="fill_parent"    
      android:layout_height="wrap_content"    
          />    
 </LinearLayout>   

显示一个ExpandableListView

2：ExpandableListViewDemo 类的内容

[java]
 package com.chama.expandablelistviewdemo;  
   
 import java.util.ArrayList;  
 import java.util.List;  
 import android.app.Activity;  
 import android.os.Bundle;  
 import android.view.Gravity;  
 import android.view.View;  
 import android.view.ViewGroup;  
 import android.widget.AbsListView;  
 import android.widget.BaseExpandableListAdapter;  
 import android.widget.ExpandableListView;  
 import android.widget.TextView;  
   
 public class ExpandableListViewDemo extends Activity {  
       
      //定义两个List，用来存放控件中Group/Child中的String  
     private List<String> groupArray;          
     private List<List<String>> childArray;  
       
     /** Called when the activity is first created. */  
     @Override  
     public void onCreate(Bundle savedInstanceState) {  
         super.onCreate(savedInstanceState);  
         setContentView(R.layout.main);  
           
         //对这两个List进行初始化，并插入一些数据  
          groupArray = new ArrayList<String>();    
          childArray = new ArrayList<List<String>>();    
             
          groupArray.add("第一行");    
          groupArray.add("第二行");    
              
          List<String> tempArray = new ArrayList<String>();    
          tempArray.add("第一条");    
          tempArray.add("第二条");    
          tempArray.add("第三条");    
             
         for(int index = 0; index <groupArray.size(); ++index)    
         {    
            childArray.add(tempArray);    
        }    
           
        //给定义好的ExpandableListView添加上Adapter  
        ExpandableListView expandableListView = (ExpandableListView)findViewById(R.id.expandableListView);  
        ExpandableAdapter adapter = new ExpandableAdapter(this);  
        expandableListView.setAdapter(adapter);  
          
     }  
       
     //定义ExpandableListView的Adapter  
      public class ExpandableAdapter extends BaseExpandableListAdapter    
      {    
          Activity activity;    
              
          public ExpandableAdapter(Activity a)    
          {    
              activity = a;    
          }    
            
          public Object getChild(int groupPosition, int childPosition)    
          {    
              return childArray.get(groupPosition).get(childPosition);    
          }   
            
          public long getChildId(int groupPosition, int childPosition)    
          {    
              return childPosition;    
          }   
            
          public int getChildrenCount(int groupPosition)    
          {    
              return childArray.get(groupPosition).size();    
          }   
            
          public View getChildView(int groupPosition, int childPosition,    
                  boolean isLastChild, View convertView, ViewGroup parent)    
          {    
              String string = childArray.get(groupPosition).get(childPosition);    
              return getGenericView(string);    
          }    
            
          // group method stub    
          public Object getGroup(int groupPosition)    
          {    
              return groupArray.get(groupPosition);    
          }    
            
          public int getGroupCount()    
          {    
              return groupArray.size();    
          }   
            
          public long getGroupId(int groupPosition)    
          {    
              return groupPosition;    
          }    
            
          public View getGroupView(int groupPosition, boolean isExpanded,    
                  View convertView, ViewGroup parent)    
          {    
              String string = groupArray.get(groupPosition);    
              return getGenericView(string);    
          }    
            
          // View stub to create Group/Children 's View    
          public TextView getGenericView(String string)    
          {    
              // Layout parameters for the ExpandableListView    
              AbsListView.LayoutParams layoutParams = new AbsListView.LayoutParams(    
                      ViewGroup.LayoutParams.FILL_PARENT, 64);    
              TextView text = new TextView(activity);    
              text.setLayoutParams(layoutParams);    
              // Center the text vertically    
              text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);    
              // Set the text starting position    
              text.setPadding(36, 0, 0, 0);    
              text.setText(string);    
              return text;    
          }    
            
         public boolean hasStableIds()    
          {    
              return false;    
          }    
          public boolean isChildSelectable(int groupPosition, int childPosition)    
          {    
              return true;    
          }    
      }    
 }  