ListView之自定义适配器的使用

1通过.实例来描述：



二..实现此功能有以下步骤：

1.ListView及ListView_Item

2.实体类的编写

3.自定义适配器的书写

4.ListView的绑定数据源与控件

<编码实现>

自定义适配器MyAdapter

package cn.edu.bzu.list_view1;

import java.util.List;

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 MyAdapter extends BaseAdapter {
  private List<People> list;

     private Context mContext;

     private LayoutInflater mInflater;

     //定义构造方法

     public MyAdapter(List<People> list, Context mContext) {

         super();

         this.list = list;

         this.mContext = mContext;

     }

 

     @Override

     public int getCount() {

         return list.size();

     }

 

     @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 hr=null;

         if(convertView==null){

             convertView=mInflater.from(mContext).inflate(R.layout.fruit_item,null); 

             hr=new ViewHolder();

             hr.Image=(ImageView)convertView.findViewById(R.id.Ivimage);

             hr.Name=(TextView)convertView.findViewById(R.id.tvName);

             hr.Contents=(TextView)convertView.findViewById(R.id.tvNews);

             convertView.setTag(hr); //设置setTag使得程序得以优化

         }else{

             hr=(ViewHolder) convertView.getTag();

         }

         //给控件赋值

         hr.Image.setBackgroundResource(list.get(position).getImageId());

         hr.Name.setText(list.get(position).getName());

         hr.Contents.setText(list.get(position).getNews());

         return convertView;

     }

     

     class ViewHolder{

         ImageView Image;

         TextView  Name;

         TextView  Contents;

     }

}

实体类People：

package cn.edu.bzu.list_view1;

public class People{
 private String name;
 private int imageId;
 private String News;
 public People(String name,int imageId,String News){
  super();
  this.name=name;
  this.imageId=imageId;
  this.News=News;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public int getImageId() {
  return imageId;
 }
 public void setImageId(int imageId) {
  this.imageId = imageId;
 }
 public String getNews() {
  return News;
 }
 public void setNews(String news) {
  News = news;
 }
 
 

}

MainActivity的编码：

package cn.edu.bzu.list_view1;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {
 private ListView LvFruits;

private List<People> list;
 private MyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setData();
        initView();
    }
    private void initView(){
    LvFruits=(ListView)findViewById(R.id.LvFruits);
    LvFruits.setAdapter(adapter);
    }
    private void setData(){
     list=new ArrayList<Fruit>();
     list.add(new People("kdjfj",R.drawable.p1,"变幻的云朵，悠悠的从我的头上飘过。我重又看见，在童年的幻觉中出现过的神话：骏马拖着的彩车，飘飘欲仙的美女，富丽堂皇的宫殿……我在心突然变得甜蜜"));
     list.add(new People("丫丫",R.drawable.p2," 美好的一天。  "));

 list.add(new People("dongdong",R.drawable.p3,"变幻的云朵，悠悠的从我的头上飘过。我重又看见，在童年的幻觉中出现过的神话：骏马拖着的彩车，飘飘欲仙的美女，富丽堂皇的宫殿……我在心突然变得甜蜜"));
     list.add(new People("xiao",R.drawable.p4,"峡谷上空的阳光是明亮的，甚至是强烈的，但因为峡谷太深，阳光仿佛要走过漫长的时间。"));
     list.add(new People("dsd",R.drawable.p5,"春在田畴，松软的泥土散发着清新湿润的气息，冬憩后醒来的麦苗儿精神焕发，展现出一派蓬勃盎然的生机""));
     adapter=new MyAdapter(list,MainActivity.this);
    }
  

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
   
}