Android学习之ExpandableListView

ExpListActivity.java:

package org.lee.android;

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.widget.ExpandableListView;

public class ExpListActivity extends Activity {

    private ExpandableListView elistview; 
    private List<Map<String, Object>> mData; 
      
    @Override
    public void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState); 
            setContentView(R.layout.exp_listview); 
            mData = getData();  
            elistview = (ExpandableListView) findViewById(R.id.elist);                               
            //这里要把系统自带的图标去掉 
            elistview.setGroupIndicator(null); 
            elistview.setAdapter(new MyElistAdapter(this,mData)); 
            // elistview.setChildDivider(null); 
            // elistview.setDivider(null); 
     } 
    
    private List<Map<String, Object>> getData() {  
        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();  
        List<Map<String, Object>> clist = new ArrayList<Map<String, Object>>(); 
        Map<String, Object> map = new HashMap<String, Object>();  
        Map<String, Object> cmap = new HashMap<String, Object>(); 
        cmap.put("cname", "安庆市");  
        clist.add(cmap); 
        cmap = new HashMap<String, Object>(); 
        cmap.put("cname", "合肥市");
        clist.add(cmap); 
        cmap = new HashMap<String, Object>(); 
        cmap.put("cname", "池州市");
        clist.add(cmap);
        cmap = new HashMap<String, Object>(); 
        cmap.put("cname", "宿州市");
        clist.add(cmap); 
        map.put("gname", "安徽省");  
        map.put("clist", clist);  
        list.add(map); 
        
        clist = new ArrayList<Map<String, Object>>(); 
        map = new HashMap<String, Object>();  
        cmap = new HashMap<String, Object>(); 
        cmap.put("cname", "南京市"); 
        clist.add(cmap); 
        cmap = new HashMap<String, Object>(); 
        cmap.put("cname", "镇江市");
        clist.add(cmap); 
        cmap = new HashMap<String, Object>(); 
        cmap.put("cname", "徐州市");
        clist.add(cmap); 
        map.put("gname", "江苏省");  
        map.put("clist", clist);  
        list.add(map);
        
        clist = new ArrayList<Map<String, Object>>(); 
        map = new HashMap<String, Object>();  
        cmap = new HashMap<String, Object>(); 
        cmap.put("cname", "武汉市");  
        clist.add(cmap); 
        cmap = new HashMap<String, Object>(); 
        cmap.put("cname", "黄冈市");
        clist.add(cmap); 
        cmap = new HashMap<String, Object>(); 
        cmap.put("cname", "宜昌市");
        clist.add(cmap); 
        map.put("gname", "湖北省");  
        map.put("clist", clist);  
        list.add(map);  
  
          
        return list;  
    }  
}

MyElistAdapter.java:

package org.lee.android;

import java.util.List;
import java.util.Map;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class MyElistAdapter extends BaseExpandableListAdapter {
  // 分组数据
//  private String[] group = { "A组", "B组", "C组", "D组" };
//  private String[][] child = { { "A01", "A02", "A03" },
//      { "B01", "B02", "B03" }, { "C01", "C02", "C03" },
//      { "D04", "D05", "D06" } };
  private Context mContext;
  private List<Map<String, Object>> glist; 

  public MyElistAdapter(Context mContext,List<Map<String, Object>> glist) {
    super();
    this.mContext = mContext;
    this.glist=glist;
  }

  @Override
  public int getGroupCount() {
    return glist.size();
  }

  @SuppressWarnings("unchecked")
  @Override
  public int getChildrenCount(int groupPosition) {
    List<Map<String, Object>> clist=(List<Map<String, Object>>) glist.get(groupPosition).get("clist");
    return clist.size();
  }

  @Override
  public Object getGroup(int groupPosition) {
    return glist.get(groupPosition).get("gname");
  }

  @SuppressWarnings("unchecked")
  @Override
  public Object getChild(int groupPosition, int childPosition) {
    List<Map<String, Object>> clist=(List<Map<String, Object>>) glist.get(groupPosition).get("clist");
    return clist.get(childPosition).get("cname");
  }

  @Override
  public long getGroupId(int groupPosition) {
    return groupPosition;
  }

  @Override
  public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
  }

  @Override
  public boolean hasStableIds() {
    return true;
  }

  @Override
  public View getGroupView(int groupPosition, boolean isExpanded,
      View convertView, ViewGroup parent) {
    // 实例化布局文件
    RelativeLayout glayout = (RelativeLayout) LayoutInflater.from(mContext)
        .inflate(R.layout.group_layout, null);
    ImageView iv = (ImageView) glayout.findViewById(R.id.giv);
    // 判断分组是否展开，分别传入不同的图片资源
    if (isExpanded) {
      iv.setImageResource(R.drawable.shop_cart_cut);
    } else {
      iv.setImageResource(R.drawable.shop_cart_plus);
    }
    TextView tv = (TextView) glayout.findViewById(R.id.gtv);
    tv.setText(this.getGroup(groupPosition).toString());
    return glayout;
  }

  @Override
  public View getChildView(int groupPosition, int childPosition,
      boolean isLastChild, View convertView, ViewGroup parent) {
    // 实例化布局文件
    LinearLayout clayout = (LinearLayout) LayoutInflater.from(mContext)
        .inflate(R.layout.child_layout, null);
    TextView tv = (TextView) clayout.findViewById(R.id.ctv);
    tv.setText(getChild(groupPosition, childPosition).toString());
    return clayout;
  }

  @Override
  public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
  }
}

exp_listview.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="fill_parent"
     android:orientation="vertical"
     android:background="#ffffff">
  
     <ExpandableListView
         android:id="@+id/elist"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:background="#ffffff"
      />
  
</LinearLayout>

group_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"                                                                    
       android:id="@+id/grlayout"
       android:layout_width="match_parent"
       android:layout_height="50dp"
       android:background="#ffffff"
       android:orientation="horizontal">
  
       <TextView
             android:id="@+id/gtv"
             android:layout_width="wrap_content"
             android:layout_height="40dp"
             android:paddingLeft="20dp"
             android:gravity="center_vertical"
             android:layout_centerVertical="true"
             android:textColor="#000000"
        />
  
       <ImageView
             android:id="@+id/giv"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_alignParentRight="true"
             android:layout_centerVertical="true"
             android:paddingRight="10dp"
             android:src="@drawable/shop_cart_plus"
        />
  
   </RelativeLayout>

child_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"                                                                        
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="horizontal"
     android:background="#ffffff"
     android:paddingLeft="30dp"
     >
  
     <ImageView
         android:id="@+id/civ"
         android:layout_height="wrap_content"
         android:layout_width="wrap_content"
         android:src="@drawable/icon_gcoding"
         android:padding="5dp"
      />
  
     <TextView
         android:id="@+id/ctv"
         android:layout_height="wrap_content"
         android:layout_width="wrap_content"
         android:padding="5dp"
         android:textColor="#000000"
      />
  
</LinearLayout>