android 用ExpandableListView实现的文件目录树框架

主要练习ExpandableListView，文件的相关操作没有写，运行效果如图：

代码如下：

AppMain.java

package lxy.litsoft;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.SimpleExpandableListAdapter;

public class AppMain extends Activity {
	
	//声明对象
	private SimpleExpandableListAdapter adapter = null;
	List<Map<String,String>> groups;
	List<List<Map<String,String>>> childs;
	ExpandableListView expandableListView;
	
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //为ExpandableListView准备数据
        groups = new ArrayList<Map<String,String>>();
        Map<String,String> group1 = new HashMap<String,String>();
    	group1.put("group","group1");
    	Map<String,String> group2 = new HashMap<String,String>();
    	group2.put("group","group2");
	    groups.add(group1);
	    groups.add(group2);
	    
        List<Map<String,String>> child1 = new ArrayList<Map<String,String>>();
        Map<String,String> child1Data1 = new HashMap<String,String>();
    	child1Data1.put("child","child1Data1");
    	child1.add(child1Data1);
    	Map<String,String> child1Data2 = new HashMap<String,String>();
    	child1Data2.put("child","child1Data2");
    	child1.add(child1Data2);
    	
    	List<Map<String,String>> child2 = new ArrayList<Map<String,String>>();
        Map<String,String> child1Data3 = new HashMap<String,String>();
    	child1Data3.put("child","child1Data3");
    	child2.add(child1Data3);
    	Map<String,String> child1Data4 = new HashMap<String,String>();
    	child1Data4.put("child","child1Data4");
    	child2.add(child1Data4);
    	
    	childs = new ArrayList<List<Map<String,String>>>();
    	childs.add(child1);
    	childs.add(child2);
    	
    	//实例化ExpandableListView对象
    	expandableListView = (ExpandableListView)findViewById(R.id.expandable);
    	//实例化ExpandableListView的适配器
    	adapter = new SimpleExpandableListAdapter(
    			 this,
    			 groups,
    			 R.layout.group,
                 new String[] {"group"},
                 new int[]{ R.id.groupText},
                 childs, 
                 R.layout.child,
                 new String[] { "child" },
                 new int[] { R.id.childText}
    			);
    	
    	//设置适配器
    	expandableListView.setAdapter(adapter);
    	//设置监听器
    	expandableListView.setOnChildClickListener(new OnChildClickListener() {
			
			public boolean onChildClick(ExpandableListView parent, View v,
					int groupPosition, int childPosition, long id) {
				Log.d("test", "GroupPosition is "+groupPosition);
				Log.d("test","ChildPosition is"+childPosition);
				return false;
			}
		});
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:id="@+id/linearLayout1"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    
    <LinearLayout
    android:orientation="horizontal"
    android:layout_weight="7"
    android:background="#FF555500"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    
    	<TextView 
	    android:layout_width="fill_parent" 
	    android:layout_height="fill_parent"
	    android:textColor="#000000"
	    android:textSize="25pt"
	    android:gravity="center_vertical|center_horizontal"
	    android:text="Title...."/>
    </LinearLayout>
    
    
    <LinearLayout 
    android:orientation="horizontal"
    android:layout_weight="1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    	<LinearLayout 
	    android:orientation="vertical"
	    android:layout_weight="3"
	    android:background="#FF005500"
	    android:layout_width="fill_parent"
	    android:layout_height="fill_parent"
	    >
	    	<!-- @id/android:id/list -->
			<ExpandableListView
			    android:id="@+id/expandable"
			    android:layout_height="fill_parent"
			    android:layout_width="fill_parent"
			    android:drawSelectorOnTop="false"></ExpandableListView>
			    
			<TextView android:id="@id/android:empty"
			    android:layout_width="fill_parent" 
			    android:layout_height="fill_parent"
			    android:text="No data"/>
	    </LinearLayout>
	    
	    <LinearLayout 
	    android:orientation="horizontal"
	    android:layout_weight="1"
	    android:background="#FFFFFFFF"
	    android:layout_width="fill_parent"
	    android:layout_height="fill_parent"
	    >
		    <TextView 
		    android:layout_width="fill_parent" 
		    android:layout_height="fill_parent"
		    android:textColor="#000000"
		    android:textSize="25pt"
		    android:gravity="center_vertical|center_horizontal"
		    android:text="Content"/>
	    </LinearLayout>
    </LinearLayout>
</LinearLayout>

group.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical">  
	<TextView    
	    xmlns:android="http://schemas.android.com/apk/res/android"  
	    android:id="@+id/groupText"
	    android:layout_marginLeft="40dip"
	    android:textSize="15pt"
	    android:textStyle="bold"
	    android:textColor="#000000"
	    android:layout_width="fill_parent"   
	    android:layout_height="wrap_content"
	    android:text="NoData" />  
</LinearLayout>

child.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical">  
	<TextView    
	    android:id="@+id/childText" 
	    android:layout_marginLeft="60dip"
	    android:textSize="10pt"
	    android:textColor="#000000"
	    android:layout_width="fill_parent"   
	    android:layout_height="wrap_content" 
	    android:text="CNoData" /> 
</LinearLayout>