关于ExpandableListView用法的一个简单小例子

2015/06/29 16:48
阅读数 36

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

 

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="fill_parent"
 4     android:layout_height="fill_parent"
 5     android:orientation="vertical" >
 6     <ExpandableListView 
 7         android:id="@+id/list"
 8         android:layout_width="fill_parent"
 9         android:layout_height="fill_parent"
10         android:background="#ffffff"
11         android:cacheColorHint="#00000000"
12         android:listSelector="#00000000" 
13         >
14     </ExpandableListView> 
15  </LinearLayout>  
16 

 


java代码: 

 

package com.eyu.activity_test;

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;
            }
        });
    }
}


 

 

点击下载本demo源代码

 

 

 

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