Android ListView Adapter

这段时间，由于在项目中经常要用到ListView控件，所以对ListView控件的自定义做了一些了解 ，其实listView控件的使用关键是adapter的使用

直接上代码

package com.Adapters;

import java.util.ArrayList;

import java.util.HashMap;

import com.AppClient.R;

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 RecipeAdapter extends BaseAdapter{

       private LayoutInflater layoutInflater; 

    private Context context; 

       /**

        * 构造函数，配置参数

        * @param data 配置ArrayList<HashMap<String,Object>类型的参数>

        * @param context this*/

       public RecipeAdapter(ArrayList<HashMap<String, Object>> data,

                      Context context) {

              super();

              this.data = data;

              this.layoutInflater = layoutInflater.from(context);

              this.context = context;

       }

       private ArrayList<HashMap<String, Object>> data; 

    /**

     * LayoutInflater 类是代码实现中获取布局文件的主要形式

     *LayoutInflater layoutInflater = LayoutInflater.from(context);

     *View convertView = layoutInflater.inflate();

     *LayoutInflater的使用,在实际开发种LayoutInflater这个类还是非常有用的,它的作用类似于findViewById(),

                  不同点是LayoutInflater是用来找layout下xml布局文件，并且实例化！

                而findViewById()是找具体xml下的具体widget控件(如:Button,TextView等)。

     */ 

       @Override

       public int getCount() {

              // TODO Auto-generated method stub

              return data.size();

       }

       @Override

       public Object getItem(int position) {

              // TODO Auto-generated method stub

              return data.get(position);

       }

       @Override

       public long getItemId(int position) {

              // TODO Auto-generated method stub

              return position;

       }

        /**

     * android绘制每一列的时候，都会调用这个方法

     */

       @Override

       public View getView(int position, View convertView, ViewGroup parent) {

              // TODO Auto-generated method stub

              Controlors controlor=null;

              if(convertView==null)

              {

                     controlor=new Controlors();

                     //获取布局组件

                     convertView=layoutInflater.inflate(R.layout.recipe_list, null);

                     controlor.imageView=(ImageView)convertView.findViewById(R.id.recipe_image);

                     controlor.textView=(TextView)convertView.findViewById(R.id.recipe_name);

                     controlor.writer=(TextView)convertView.findViewById(R.id.writer);

                     controlor.mainResource=(TextView)convertView.findViewById(R.id.main_resource);

                     controlor.littleResourc=(TextView)convertView.findViewById(R.id.little_resource);

                     //使用tag来存储数据

                     convertView.setTag(controlor);

              }

              else

              {

                     controlor=(Controlors)convertView.getTag();

              }

              //绑定数据以及事件触发

              controlor.imageView.setBackgroundResource((Integer)data.get(position).get("recipe_image"));

              controlor.textView.setText((String)data.get(position).get("recipe_name"));

           controlor.writer.setText((String)data.get(position).get("writer"));

           controlor.mainResource.setText((String)data.get(position).get("main_resource"));

           controlor.littleResourc.setText((String)data.get(position).get("little_resource"));

              return convertView;

       }

}