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  • android ExpandableListView

    本文采用一个Demo来展示Android中ExpandableListView控件的使用，如如何在组/子ListView中绑定数据源。直接上代码如下：

    程序结构图：

    layout目录下的 main.xml 文件源码如下：

    [html] view plaincopyprint?
    1. <?xml version="1.0" encoding="utf-8"?>  
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    3.     android:orientation="vertical"  
    4.     android:layout_width="fill_parent"  
    5.     android:layout_height="fill_parent">  
    6.     <!-- 我们会自己定义listview的显示方式（在另外一个布局文件里边）不用默认的方式   
    7.          如果自定义listview的显示方式这里这个android:id="@id/android:list" 必须这样写 -->  
    8.     <!-- android:drawSelectOnTop="false"此属性用来设置listview上的背景颜色会不会  
    9.      挡住（覆盖）内容 , 如果这是为false就表示不会覆盖掉 -->   
    10.     <ExpandableListView   
    11.         android:id="@id/android:list"                 
    12.         android:layout_width="fill_parent"                  
    13.         android:layout_height="wrap_content"                
    14.         android:layout_weight="1"                 
    15.         android:drawSelectorOnTop="false"/>   
    16. </LinearLayout>  
    <?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">
    <!-- 我们会自己定义listview的显示方式（在另外一个布局文件里边）不用默认的方式 
         如果自定义listview的显示方式这里这个android:id="@id/android:list" 必须这样写 -->
    <!-- android:drawSelectOnTop="false"此属性用来设置listview上的背景颜色会不会
 	 挡住（覆盖）内容 , 如果这是为false就表示不会覆盖掉 --> 
    <ExpandableListView 
        android:id="@id/android:list"               
	 	android:layout_width="fill_parent"                
	 	android:layout_height="wrap_content"              
	 	android:layout_weight="1"               
	 	android:drawSelectorOnTop="false"/> 
</LinearLayout>

    包 com.andyidea.demo中ContactsActivity.java源码如下：

    [html] view plaincopyprint?
    1. package com.andyidea.demo;  
    2.   
    3. import java.util.ArrayList;  
    4. import java.util.List;  
    5.   
    6. import android.app.ExpandableListActivity;  
    7. import android.os.Bundle;  
    8. import android.view.Gravity;  
    9. import android.view.View;  
    10. import android.view.ViewGroup;  
    11. import android.view.Window;  
    12. import android.widget.AbsListView;  
    13. import android.widget.BaseExpandableListAdapter;  
    14. import android.widget.TextView;  
    15.   
    16. public class ContactsActivity extends ExpandableListActivity {  
    17.       
    18.     List<String> group;           //组列表  
    19.     List<List<String>> child;     //子列表  
    20.     ContactsInfoAdapter adapter;  //数据适配器  
    21.       
    22.     /** Called when the activity is first created. */  
    23.     @Override  
    24.     public void onCreate(Bundle savedInstanceState) {  
    25.         super.onCreate(savedInstanceState);  
    26.         requestWindowFeature(Window.FEATURE_NO_TITLE);  //设置为无标题  
    27.         setContentView(R.layout.main);  
    28.         getExpandableListView().setBackgroundResource(R.drawable.default_bg);  
    29.           
    30.         initializeData();  
    31.         getExpandableListView().setAdapter(new ContactsInfoAdapter());  
    32.         getExpandableListView().setCacheColorHint(0);  //设置拖动列表的时候防止出现黑色背景  
    33.     }  
    34.       
    35.     /**  
    36.      * 初始化组、子列表数据  
    37.      */  
    38.     private void initializeData(){  
    39.         group = new ArrayList<String>();  
    40.         child = new ArrayList<List<String>>();  
    41.           
    42.         addInfo("Andy",new String[]{"male","138123***","GuangZhou"});  
    43.         addInfo("Fairy",new String[]{"female","138123***","GuangZhou"});  
    44.         addInfo("Jerry",new String[]{"male","138123***","ShenZhen"});  
    45.         addInfo("Tom",new String[]{"female","138123***","ShangHai"});  
    46.         addInfo("Bill",new String[]{"male","138231***","ZhanJiang"});  
    47.           
    48.     }  
    49.       
    50.     /**  
    51.      * 模拟给组、子列表添加数据  
    52.      * @param g-group  
    53.      * @param c-child  
    54.      */  
    55.     private void addInfo(String g,String[] c){  
    56.         group.add(g);  
    57.         List<String> childitem = new ArrayList<String>();  
    58.         for(int i=0;i<c.length;i++){  
    59.             childitem.add(c[i]);  
    60.         }  
    61.         child.add(childitem);  
    62.     }  
    63.       
    64.     class ContactsInfoAdapter extends BaseExpandableListAdapter{  
    65.   
    66.           
    67.         //-----------------Child----------------//  
    68.         @Override  
    69.         public Object getChild(int groupPosition, int childPosition) {  
    70.             return child.get(groupPosition).get(childPosition);  
    71.         }  
    72.           
    73.         @Override  
    74.         public long getChildId(int groupPosition, int childPosition) {  
    75.             return childPosition;  
    76.         }  
    77.           
    78.         @Override  
    79.         public int getChildrenCount(int groupPosition) {  
    80.             return child.get(groupPosition).size();  
    81.         }  
    82.           
    83.         @Override  
    84.         public View getChildView(int groupPosition, int childPosition,  
    85.                 boolean isLastChild, View convertView, ViewGroup parent) {  
    86.             String string = child.get(groupPosition).get(childPosition);   
    87.             return getGenericView(string);  
    88.         }  
    89.           
    90.         //----------------Group----------------//  
    91.         @Override  
    92.         public Object getGroup(int groupPosition) {  
    93.             return group.get(groupPosition);  
    94.         }                 
    95.   
    96.         @Override  
    97.         public long getGroupId(int groupPosition) {  
    98.             return groupPosition;  
    99.         }     
    100.           
    101.         @Override  
    102.         public int getGroupCount() {  
    103.             return group.size();  
    104.         }     
    105.           
    106.         @Override  
    107.         public View getGroupView(int groupPosition, boolean isExpanded,  
    108.                 View convertView, ViewGroup parent) {  
    109.             String string = group.get(groupPosition);    
    110.             return getGenericView(string);  
    111.         }  
    112.   
    113.         //创建组/子视图    
    114.         public TextView getGenericView(String s) {    
    115.             // Layout parameters for the ExpandableListView    
    116.             AbsListView.LayoutParams lp = new AbsListView.LayoutParams(    
    117.                     ViewGroup.LayoutParams.FILL_PARENT, 40);  
    118.     
    119.             TextView text = new TextView(ContactsActivity.this);    
    120.             text.setLayoutParams(lp);    
    121.             // Center the text vertically    
    122.             text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);    
    123.             // Set the text starting position    
    124.             text.setPadding(36, 0, 0, 0);    
    125.                 
    126.             text.setText(s);    
    127.             return text;    
    128.         }    
    129.           
    130.           
    131.         @Override  
    132.         public boolean hasStableIds() {  
    133.             // TODO Auto-generated method stub  
    134.             return false;  
    135.         }         
    136.   
    137.         @Override  
    138.         public boolean isChildSelectable(int groupPosition, int childPosition) {  
    139.             // TODO Auto-generated method stub  
    140.             return true;  
    141.         }  
    142.           
    143.     }  
    144. }  
    package com.andyidea.demo;

import java.util.ArrayList;
import java.util.List;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class ContactsActivity extends ExpandableListActivity {
	
	List<String> group;           //组列表
	List<List<String>> child;     //子列表
	ContactsInfoAdapter adapter;  //数据适配器
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);  //设置为无标题
        setContentView(R.layout.main);
        getExpandableListView().setBackgroundResource(R.drawable.default_bg);
        
        initializeData();
        getExpandableListView().setAdapter(new ContactsInfoAdapter());
        getExpandableListView().setCacheColorHint(0);  //设置拖动列表的时候防止出现黑色背景
    }
    
    /**
     * 初始化组、子列表数据
     */
    private void initializeData(){
    	group = new ArrayList<String>();
    	child = new ArrayList<List<String>>();
    	
    	addInfo("Andy",new String[]{"male","138123***","GuangZhou"});
    	addInfo("Fairy",new String[]{"female","138123***","GuangZhou"});
    	addInfo("Jerry",new String[]{"male","138123***","ShenZhen"});
    	addInfo("Tom",new String[]{"female","138123***","ShangHai"});
    	addInfo("Bill",new String[]{"male","138231***","ZhanJiang"});
    	
    }
    
    /**
     * 模拟给组、子列表添加数据
     * @param g-group
     * @param c-child
     */
    private void addInfo(String g,String[] c){
    	group.add(g);
    	List<String> childitem = new ArrayList<String>();
    	for(int i=0;i<c.length;i++){
    		childitem.add(c[i]);
    	}
    	child.add(childitem);
    }
    
    class ContactsInfoAdapter extends BaseExpandableListAdapter{

    	
    	//-----------------Child----------------//
    	@Override
		public Object getChild(int groupPosition, int childPosition) {
			return child.get(groupPosition).get(childPosition);
		}
    	
    	@Override
		public long getChildId(int groupPosition, int childPosition) {
			return childPosition;
		}
    	
    	@Override
		public int getChildrenCount(int groupPosition) {
			return child.get(groupPosition).size();
		}
    	
    	@Override
		public View getChildView(int groupPosition, int childPosition,
				boolean isLastChild, View convertView, ViewGroup parent) {
    		String string = child.get(groupPosition).get(childPosition); 
			return getGenericView(string);
		}
    	
    	//----------------Group----------------//
    	@Override
		public Object getGroup(int groupPosition) {
			return group.get(groupPosition);
		}				

		@Override
		public long getGroupId(int groupPosition) {
			return groupPosition;
		}	
		
		@Override
		public int getGroupCount() {
			return group.size();
		}	
		
		@Override
		public View getGroupView(int groupPosition, boolean isExpanded,
				View convertView, ViewGroup parent) {
			String string = group.get(groupPosition);  
			return getGenericView(string);
		}

		//创建组/子视图  
        public TextView getGenericView(String s) {  
            // Layout parameters for the ExpandableListView  
            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(  
                    ViewGroup.LayoutParams.FILL_PARENT, 40);
  
            TextView text = new TextView(ContactsActivity.this);  
            text.setLayoutParams(lp);  
            // Center the text vertically  
            text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);  
            // Set the text starting position  
            text.setPadding(36, 0, 0, 0);  
              
            text.setText(s);  
            return text;  
        }  
		
		
		@Override
		public boolean hasStableIds() {
			// TODO Auto-generated method stub
			return false;
		}		

		@Override
		public boolean isChildSelectable(int groupPosition, int childPosition) {
			// TODO Auto-generated method stub
			return true;
		}
    	
    }
}

    最后，程序运行后截图如下：

           
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  • 原文地址：https://www.cnblogs.com/lzjsky/p/4938956.html
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