Android  ListView条目多样式展示实例详解

package com.bwei.test.BaseAdapter;

import java.util.List;

import com.bwei.test.R;
import com.bwei.test.bean.News;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;

import android.R.color;
import android.R.layout;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class MyBaseAdapter extends BaseAdapter {

  private Context context;
  private List newlist;
  //ImageLoader
  private DisplayImageOptions Options;
  //定义样式常量，注意常量值要从0开始
  private static final int TYPE_LISTVIEW_NORMAL = 0;
  private static final int TYPE_LISTVIEW_NO_PIC = 1;

  public MyBaseAdapter(Context context, List newlist,
      DisplayImageOptions options) {
    super();
    this.context = context;
    this.newlist = newlist;
    Options = options;
  }


  @Override
  public int getCount() {
    //ListView的总共条数
    return newlist.size();
  }

  @Override
  public Object getItem(int arg0) {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public long getItemId(int arg0) {
    // TODO Auto-generated method stub
    return 0;
  }

  /*
   * 注意我们要填充的布局个数和我们要展示的样式个数一样
   * 最好一个样式一个填充布局
   * 
   * */
  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    // 获取当前条目的类型
    int itemViewType = getItemViewType(position);
    ViewHolder viewHolder;
    if (convertView==null) {
      viewHolder=new ViewHolder();
      switch (itemViewType) {
      case TYPE_LISTVIEW_NORMAL:

        convertView=LayoutInflater.from(context).inflate(R.layout.title_pic, null);
        viewHolder.imageView=(ImageView) convertView.findViewById(R.id.imageView1);
        ImageLoader.getInstance().displayImage(newlist.get(position).getImgs(), viewHolder.imageView,Options);
        convertView.setTag(viewHolder);
        break;
      case TYPE_LISTVIEW_NO_PIC:
        convertView=LayoutInflater.from(context).inflate(R.layout.title, null);
        convertView.setTag(viewHolder);
        break;

      default:
        break;
      }

      viewHolder.textcopyright=(TextView) convertView.findViewById(R.id.copyright);
      viewHolder.texttime=(TextView) convertView.findViewById(R.id.data);
      viewHolder.texttitle=(TextView) convertView.findViewById(R.id.title);
  viewHolder.texttitle.setText(
      newlist.get(position).getTitle());
  viewHolder.texttime.setText(
      newlist.get(position).getPubDate());
  viewHolder.textcopyright.setText(
      newlist.get(position).getCopyright());

    } else {
      viewHolder=(ViewHolder) convertView.getTag();
      switch (itemViewType) {
      case TYPE_LISTVIEW_NORMAL:
ImageLoader.getInstance().displayImage(
       newlist.get(position).getImgs(),
             viewHolder.imageView,Options);

        break;
      case TYPE_LISTVIEW_NO_PIC:

        break;

      default:
        break;
      }
viewHolder.texttitle.setText(
      newlist.get(position).getTitle());

viewHolder.texttime.setText(
      newlist.get(position).getPubDate());
viewHolder.textcopyright.setText(
      newlist.get(position).getCopyright());
    }
    return convertView;
  }

  /**
   * 获取具体的某个索引值下的条目的条目类型
   */
  @Override
  public int getItemViewType(int position) {
    // TODO Auto-generated method stub
    //判断以什么结束的属性
    if ( newlist.get(position).getImgs().endsWith(".jpg")) {
      return TYPE_LISTVIEW_NORMAL;
    }

    return TYPE_LISTVIEW_NO_PIC;
  }

  /**
   * 获取listView条目类别的个数（样式）
   */
  @Override
  public int getViewTypeCount() {
    // TODO Auto-generated method stub
    return 2;
  }
  //容器
  class ViewHolder{

      ImageView imageView;
      TextView texttitle,textcopyright,texttime;


}


}