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最新推荐文章于 2025-09-13 09:50:31 发布

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最新推荐文章于 2025-09-13 09:50:31 发布

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CC 4.0 BY-SA版权

文章标签：移动开发 java

原文链接：http://www.cnblogs.com/taogev5/p/5631118.html

本文介绍了一种使用Java实现的自定义适配器CollectAdapter，该适配器用于处理不同类型的Collect对象，并根据不同类型加载不同的布局。通过BitmapUtils类进行图片加载，实现了列表项的复用，提高了列表滚动的流畅度。

package com.wt.ada;

import java.util.ArrayList;

import com.lidroid.xutils.BitmapUtils;
import com.wt.top.R;
import com.wt.vo.Collect;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class CollectAdapter extends BaseAdapter {

   private Context con;
   private ArrayList<Collect> list;
   private ViewHolder vh;
   private ViewHolder2 vh2;
   private BitmapUtils bu;

   public CollectAdapter(Context con, ArrayList<Collect> list) {
       // TODO Auto-generated constructor stub
       this.con = con;
       this.list = list;
       bu = new BitmapUtils(con);
   }

   @Override
   public int getCount() {
       // TODO Auto-generated method stub
       return list.size();
   }

   @Override
   public Object getItem(int position) {
       // TODO Auto-generated method stub
       return null;
   }

   @Override
   public int getItemViewType(int position) {
       // TODO Auto-generated method stub
       return list.get(position).getType();
   }

   @Override
   public int getViewTypeCount() {
       // TODO Auto-generated method stub
       return 3;
   }

   @Override
   public long getItemId(int position) {
       // TODO Auto-generated method stub
       return 0;
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
       // TODO Auto-generated method stub
       int type = getItemViewType(position);
       if (convertView == null) {
           switch (type) {
           case 1:
               convertView = View.inflate(con, R.layout.frag_lv_item1, null);
               vh = new ViewHolder();
               vh.title = (TextView) convertView.findViewById(R.id.title);
               vh.image1 = (ImageView) convertView.findViewById(R.id.image1);
               vh.jia = (ImageView) convertView.findViewById(R.id.jia);
               vh.title.setText(list.get(position).getTitle());
               vh.image1.setVisibility(View.GONE);
               vh.jia.setVisibility(View.GONE);
               convertView.setTag(convertView);
               break;
           case 2:
               convertView = View.inflate(con, R.layout.frag_lv_item1, null);
               vh = new ViewHolder();
               vh.title = (TextView) convertView.findViewById(R.id.title);
               vh.image1 = (ImageView) convertView.findViewById(R.id.image1);
               vh.jia = (ImageView) convertView.findViewById(R.id.jia);
               vh.title.setText(list.get(position).getTitle());
               vh.title.setWidth(249);
               bu.display(vh.image1, list.get(position).getUrl());
               vh.jia.setVisibility(View.GONE);
               convertView.setTag(convertView);
               break;
           case 3:
               convertView = View.inflate(con, R.layout.frag_lv_item3, null);
               vh2 = new ViewHolder2();
               vh2.title3 = (TextView) convertView.findViewById(R.id.title3);
               vh2.image3_1 = (ImageView) convertView
                       .findViewById(R.id.image3_1);
               vh2.image3_2 = (ImageView) convertView
                       .findViewById(R.id.image3_2);
               vh2.image3_3 = (ImageView) convertView
                       .findViewById(R.id.image3_3);
               vh2.jia3 = (ImageView) convertView.findViewById(R.id.jia3);
               vh2.title3.setText(list.get(position).getTitle());
               bu.display(vh2.image3_1, list.get(position).getImage1());
               bu.display(vh2.image3_2, list.get(position).getImage2());
               bu.display(vh2.image3_3, list.get(position).getImage3());
               vh2.jia3.setVisibility(View.GONE);
               convertView.setTag(convertView);
               break;

           }
       } else {
           switch (type) {
           case 1:
               vh = (ViewHolder) convertView.getTag();
               break;
           case 2:
               vh = (ViewHolder) convertView.getTag();
               break;
           case 3:
               vh2 = (ViewHolder2) convertView.getTag();
               break;

           default:
               break;
           }
       }
       return convertView;
   }

   class ViewHolder {
       TextView title;
       ImageView image1;
       ImageView jia;
   }

   class ViewHolder2 {
       TextView title3;
       ImageView image3_1;
       ImageView image3_2;
       ImageView image3_3;
       ImageView jia3;
   }
}