listview实践

package com.addaegg.androidwork4.adapter; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.content.Intent; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; import com.addaegg.androidwork4.R; import com.addaegg.androidwork4.activity.MainActivity; import com.addaegg.androidwork4.activity.ProInfoActivity; import com.addaegg.androidwork4.activity.StoreActivity; import com.addaegg.androidwork4.entity.CartProductInfo; import com.addaegg.androidwork4.entity.ProductInfo; /**  * 2列ListView的适配器  * @author tongleer.com  *  */ public class MyAdapter extends BaseAdapter{ protected Context context; protected LayoutInflater inflater; protected int resource; protected ArrayList<CartProductInfo> list; public MyAdapter(Context context, int resource, ArrayList<CartProductInfo> list){ inflater = LayoutInflater.from(context); this.context = context; this.resource = resource; if(list==null){ this.list=new ArrayList<CartProductInfo>();
        }else{ this.list = list;
        }
    } @Override  public int getCount() { if(list.size()%2>0) { return list.size()/2+1;
        } else { return list.size()/2;
        }
    } @Override  public Object getItem(int position) { return list.get(position);
    } @Override  public long getItemId(int position) { return position;
    } @Override  public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder vh = null; if (convertView == null ) {
            convertView = inflater.inflate(resource, null);
            vh = new ViewHolder();
            vh.list_1=(LinearLayout) convertView.findViewById(R.id.list_1);
            vh.list_2=(LinearLayout) convertView.findViewById(R.id.list_2);
            vh.item1_img=(ImageView) convertView.findViewById(R.id.item1_img);
            vh.item1_info=(TextView) convertView.findViewById(R.id.item1_info);
            vh.item1_price=(TextView) convertView.findViewById(R.id.item1_price);
            vh.item1_num=(TextView) convertView.findViewById(R.id.item1_num);
            vh.item2_img=(ImageView) convertView.findViewById(R.id.item2_img);
            vh.item2_info=(TextView) convertView.findViewById(R.id.item2_info);
            vh.item2_price=(TextView) convertView.findViewById(R.id.item2_price);
            vh.item2_num=(TextView) convertView.findViewById(R.id.item2_num);
            convertView.setTag(vh);
        }else {
            vh = (ViewHolder)convertView.getTag();
        } int distance = list.size() - position*2; int cellCount = distance >= 2? 2:distance; final List<CartProductInfo> itemList = list.subList(position*2,position*2+cellCount); if (itemList.size() >0) {
            vh.item1_img.setImageResource(itemList.get(0).getImg());
            vh.item1_info.setText(itemList.get(0).getInfo());
            Log.e("getPeopleNum","¥"+itemList.get(0).getOnePrice()+"券后价");
            vh.item1_price.setText("¥"+itemList.get(0).getOnePrice()+"券后价");
            vh.item1_num.setText(itemList.get(0).getPeopleNum()+"人付款");
            vh.list_1.setOnClickListener(new View.OnClickListener() { @Override  public void onClick(View view) {

                    Intent intent= new Intent(context, ProInfoActivity.class);
                    CartProductInfo cartProductInfo = new CartProductInfo( itemList.get(0).getImg(), itemList.get(0).getName(), itemList.get(0).getInfo(), itemList.get(0).getNum(), itemList.get(0).getOnePrice(), itemList.get(0).getAllPrice(), itemList.get(0).getPeopleNum());
                    intent.putExtra("product",cartProductInfo); context.startActivity(intent);
                }
            }); if (itemList.size() >1){
                vh.list_2.setVisibility(View.VISIBLE);
                vh.item2_img.setImageResource(itemList.get(1).getImg());
                vh.item2_info.setText(itemList.get(1).getInfo());
                vh.item2_price.setText("¥"+itemList.get(1).getOnePrice()+"券后价");
                vh.item2_num.setText(itemList.get(1).getPeopleNum()+"人付款");
                vh.list_2.setOnClickListener(new View.OnClickListener() { @Override  public void onClick(View view) {
                        Intent intent= new Intent(context, ProInfoActivity.class);
                        CartProductInfo cartProductInfo = new CartProductInfo( itemList.get(1).getImg(), itemList.get(1).getName(), itemList.get(1).getInfo(), itemList.get(1).getNum(), itemList.get(1).getOnePrice(), itemList.get(1).getAllPrice(), itemList.get(1).getPeopleNum());
                        intent.putExtra("product",cartProductInfo); context.startActivity(intent);
                    }
                });
            }else{
                vh.list_2.setVisibility(View.INVISIBLE);
            }
        } return convertView;
    } /**  * 封装ListView中item控件以优化ListView  * @author tongleer  *  */  public static class ViewHolder{
        ImageView item1_img,item2_img;
        TextView item1_info,item1_price,item1_num,item2_info,item2_price,item2_num;
        LinearLayout list_1,list_2; //TextView tv2;  }
}