分享Android中ExpandableListView控件使用教程_Android

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：

<?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：

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：

希望本文所述对大家学习Android软件编程有所帮助。

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