Android仿QQ好友列表实现列表收缩与展开

3、接着在drawable文件夹定义布局二级列表childs.xml

<LinearLayout 
  xmlns:android="http://www.easck.com/apk/res/android" 
 android:orientation="vertical" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
> 
　　 <TextView  
    android:id="@+id/textChild" 
  android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:paddingLeft="60px" 
    android:paddingTop="10px" 
    android:paddingBottom="10px" 
    android:textSize="20sp" 
  android:text="No Data" 
/> 
 
</LinearLayout> 

4、然后就是初始化和使用了

package com.example.expandablelistview; 
 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import android.os.Bundle; 
import android.app.ExpandableListActivity; 
import android.util.DisplayMetrics; 
import android.view.View; 
import android.widget.ExpandableListView; 
import android.widget.SimpleExpandableListAdapter; 
import android.widget.Toast; 
 
public class MainActivity extends ExpandableListActivity { 
  /** 
   * 创建一级条目容器 
   */ 
  List<Map<String, String>> gruops = new ArrayList<Map<String, String>>(); 
  /** 
   * 存放内容, 以便显示在列表中 
   */ 
  List<List<Map<String, String>>> childs = new ArrayList<List<Map<String, String>>>(); 
 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    setListData(); 
  } 
 
  /** 
   * 设置列表内容 
   */ 
  public void setListData() { 
    // 创建二个一级条目标题 
    Map<String, String> title_1 = new HashMap<String, String>(); 
    Map<String, String> title_2 = new HashMap<String, String>(); 
    Map<String, String> title_3 = new HashMap<String, String>(); 
    title_1.put("group", "林炳文"); 
    title_2.put("group", "文炳林"); 
    gruops.add(title_1); 
    gruops.add(title_2); 
 
    // 创建二级条目内容 
    // 内容一 
    Map<String, String> title_1_content_1 = new HashMap<String, String>(); 
    Map<String, String> title_1_content_2 = new HashMap<String, String>(); 
    Map<String, String> title_1_content_3 = new HashMap<String, String>(); 
    title_1_content_1.put("child", "工人"); 
    title_1_content_2.put("child", "学生"); 
    title_1_content_3.put("child", "农民"); 
 
    List<Map<String, String>> childs_1 = new ArrayList<Map<String, String>>(); 
    childs_1.add(title_1_content_1); 
    childs_1.add(title_1_content_2); 
    childs_1.add(title_1_content_3); 
 
    // 内容二 
    Map<String, String> title_2_content_1 = new HashMap<String, String>(); 
    Map<String, String> title_2_content_2 = new HashMap<String, String>(); 
    Map<String, String> title_2_content_3 = new HashMap<String, String>(); 
    title_2_content_1.put("child", "猩猩"); 
    title_2_content_2.put("child", "老虎"); 
    title_2_content_3.put("child", "狮子"); 
    List<Map<String, String>> childs_2 = new ArrayList<Map<String, String>>(); 
    childs_2.add(title_2_content_1); 
    childs_2.add(title_2_content_2); 
    childs_2.add(title_2_content_3); 
 
    childs.add(childs_1); 
    childs.add(childs_2); 
 
    /** 
     * 创建ExpandableList的Adapter容器 参数: 1.上下文 2.一级集合 3.一级样式文件 4. 一级条目键值 
     * 5.一级显示控件名 6. 二级集合 7. 二级样式 8.二级条目键值 9.二级显示控件名 
     * 
     */ 
    SimpleExpandableListAdapter sela = new SimpleExpandableListAdapter( 
        this, gruops, R.drawable.groups, new String[] { "group" }, 
        new int[] { R.id.textGroup }, childs, R.drawable.childs, 
        new String[] { "child" }, new int[] { R.id.textChild }); 
    // 加入列表 
    setListAdapter(sela); 
  } 
 
  /** 
   * 列表内容按下 
   */ 
  @Override 
  public boolean onChildClick(ExpandableListView parent, View v, 
      int groupPosition, int childPosition, long id) { 
    Toast.makeText( 
        MainActivity.this, 
        "您选择了" 
            + gruops.get(groupPosition).toString() 
            + "子编号" 
            + childs.get(groupPosition).get(childPosition) 
                .toString(), Toast.LENGTH_SHORT).show(); 
    return super.onChildClick(parent, v, groupPosition, childPosition, id); 
  } 
 
  /** 
   * 二级标题按下 
   */ 
  @Override 
  public boolean setSelectedChild(int groupPosition, int childPosition, 
      boolean shouldExpandGroup) { 
    return super.setSelectedChild(groupPosition, childPosition, 
        shouldExpandGroup); 
  } 
 
  /** 
   * 一级标题按下 
   */ 
  @Override 
  public void setSelectedGroup(int groupPosition) { 
    super.setSelectedGroup(groupPosition); 
  } 
} 
								 
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