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>

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