关于ExpandableListView用法的一个简单小例子

喜欢显示好友QQ那样的列表，可以展开，可以收起，在android中，以往用的比较多的是listview，虽然可以实现列表的展示，但在某些情况下，我们还是希望用到可以分组并实现收缩的列表，那就要用到android的ExpandableListView，今天研究了一下这个的用法，也参考了很多资料动手写了一个小demo，实现了基本的功能，但界面优化方面做得还不够好，有待改进，素材采用了Q版三国杀武将的图片，很有爱哈哈，下面直接上效果图以及源代码~！

main.xml的布局很简单啦，只是一个ExpandableListView 就OK了
但值得简单说下的是 android:cacheColorHint=”#00000000”，这个设置可以去除拖动view时背景变成黑色的效果
android:listSelector=”#00000000” ，可以去除选中时的黄色底色

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:layout_width="fill_parent"      android:layout_height="fill_parent"      android:orientation="vertical" >      <ExpandableListView           android:id="@+id/list"          android:layout_width="fill_parent"          android:layout_height="fill_parent"          android:background="#ffffff"          android:cacheColorHint="#00000000"          android:listSelector="#00000000"           >          </ExpandableListView>  </LinearLayout>

import android.app.Activity;  import android.graphics.Color;  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.ExpandableListAdapter;  import android.widget.ExpandableListView;  import android.widget.ExpandableListView.OnChildClickListener;  import android.widget.ImageView;  import android.widget.LinearLayout;  import android.widget.TextView;  import android.widget.Toast;  public class ExpandableList extends Activity{      protected void onCreate(Bundle savedInstanceState) {          // TODO Auto-generated method stub          super.onCreate(savedInstanceState);          requestWindowFeature(Window.FEATURE_NO_TITLE);          setContentView(R.layout.main);          final ExpandableListAdapter adapter = new BaseExpandableListAdapter() {              //设置组视图的图片              int[] logos = new int[] { R.drawable.wei, R.drawable.shu,R.drawable.wu};              //设置组视图的显示文字              private String[] generalsTypes = new String[] { "魏", "蜀", "吴" };              //子视图显示文字              private String[][] generals = new String[][] {                      { "夏侯惇", "甄姬", "许褚", "郭嘉", "司马懿", "杨修" },                      { "马超", "张飞", "刘备", "诸葛亮", "黄月英", "赵云" },                      { "吕蒙", "陆逊", "孙权", "周瑜", "孙尚香" }              };              //子视图图片              public int[][] generallogos = new int[][] {                      { R.drawable.xiahoudun, R.drawable.zhenji,                              R.drawable.xuchu, R.drawable.guojia,                              R.drawable.simayi, R.drawable.yangxiu },                      { R.drawable.machao, R.drawable.zhangfei,                              R.drawable.liubei, R.drawable.zhugeliang,                              R.drawable.huangyueying, R.drawable.zhaoyun },                      { R.drawable.lvmeng, R.drawable.luxun, R.drawable.sunquan,                              R.drawable.zhouyu, R.drawable.sunshangxiang } };              //自己定义一个获得文字信息的方法              TextView getTextView() {                  AbsListView.LayoutParams lp = new AbsListView.LayoutParams(                          ViewGroup.LayoutParams.FILL_PARENT, 64);                  TextView textView = new TextView(                          ExpandableList.this);                  textView.setLayoutParams(lp);                  textView.setGravity(Gravity.CENTER_VERTICAL);                  textView.setPadding(36, 0, 0, 0);                  textView.setTextSize(20);                  textView.setTextColor(Color.BLACK);                  return textView;              }              //重写ExpandableListAdapter中的各个方法              @Override              public int getGroupCount() {                  // TODO Auto-generated method stub                  return generalsTypes.length;              }              @Override              public Object getGroup(int groupPosition) {                  // TODO Auto-generated method stub                  return generalsTypes[groupPosition];              }              @Override              public long getGroupId(int groupPosition) {                  // TODO Auto-generated method stub                  return groupPosition;              }              @Override              public int getChildrenCount(int groupPosition) {                  // TODO Auto-generated method stub                  return generals[groupPosition].length;              }              @Override              public Object getChild(int groupPosition, int childPosition) {                  // TODO Auto-generated method stub                  return generals[groupPosition][childPosition];              }              @Override              public long getChildId(int groupPosition, int childPosition) {                  // TODO Auto-generated method stub                  return childPosition;              }              @Override              public boolean hasStableIds() {                  // TODO Auto-generated method stub                  return true;              }              @Override              public View getGroupView(int groupPosition, boolean isExpanded,                      View convertView, ViewGroup parent) {                  // TODO Auto-generated method stub                  LinearLayout ll = new LinearLayout(                          ExpandableList.this);                  ll.setOrientation(0);                  ImageView logo = new ImageView(ExpandableList.this);                  logo.setImageResource(logos[groupPosition]);                  logo.setPadding(50, 0, 0, 0);                  ll.addView(logo);                  TextView textView = getTextView();                  textView.setTextColor(Color.BLACK);                  textView.setText(getGroup(groupPosition).toString());                  ll.addView(textView);                  return ll;              }              @Override              public View getChildView(int groupPosition, int childPosition,                      boolean isLastChild, View convertView, ViewGroup parent) {                  // TODO Auto-generated method stub                  LinearLayout ll = new LinearLayout(                          ExpandableList.this);                  ll.setOrientation(0);                  ImageView generallogo = new ImageView(                          ExpandableList.this);                  generallogo                          .setImageResource(generallogos[groupPosition][childPosition]);                  ll.addView(generallogo);                  TextView textView = getTextView();                  textView.setText(getChild(groupPosition, childPosition)                          .toString());                  ll.addView(textView);                  return ll;              }              @Override              public boolean isChildSelectable(int groupPosition,                      int childPosition) {                  // TODO Auto-generated method stub                  return true;              }          };          ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.list);          expandableListView.setAdapter(adapter);          //设置item点击的监听器          expandableListView.setOnChildClickListener(new OnChildClickListener() {              @Override              public boolean onChildClick(ExpandableListView parent, View v,                      int groupPosition, int childPosition, long id) {                  Toast.makeText(                          ExpandableList.this,                          "你点击了" + adapter.getChild(groupPosition, childPosition),                          Toast.LENGTH_SHORT).show();                  return false;              }          });      }  }