模拟微博看看--ListView的应用

 1 package cn.edu.bzu.adapter;
 2  
 3 import java.util.List;
 4  
 5 import cn.edu.bzu.entity.Information;
 6 import cn.edu.bzu.weibo_looking.R;
 7 import android.content.Context;
 8 import android.view.LayoutInflater;
 9 import android.view.View;
10 import android.view.ViewGroup;
11 import android.widget.BaseAdapter;
12 import android.widget.ImageView;
13 import android.widget.TextView;
14  
15 /**
16  * 自定义Adapter实现listView的显示
17  * @author monster
18  * @date : 2015-04-28
19  */
20 public class MyAdapter extends BaseAdapter {
21     private List<Information> list;
22     private Context mContext;
23     private LayoutInflater mInflater;
24     //定义构造方法
25     public MyAdapter(List<Information> list, Context mContext) {
26         super();
27         this.list = list;
28         this.mContext = mContext;
29     }
30  
31     @Override
32     public int getCount() {
33         return list.size();
34     }
35  
36     @Override
37     public Object getItem(int position) {
38         return list.get(position);
39     }
40  
41     @Override
42     public long getItemId(int position) {
43         return position;
44     }
45  
46     @Override
47     public View getView(int position, View convertView, ViewGroup parent) {
48         ViewHolder holder=null;
49         if(convertView==null){
50             convertView=mInflater.from(mContext).inflate(R.layout.listview_item,null);  //布局转换成视图
51             holder=new ViewHolder();
52             //实例化控件
53             holder.Image=(ImageView)convertView.findViewById(R.id.Iv);
54             holder.Name=(TextView)convertView.findViewById(R.id.Name);
55             holder.Time=(TextView)convertView.findViewById(R.id.Time);
56             holder.Contents=(TextView)convertView.findViewById(R.id.Contents);
57             convertView.setTag(holder); //设置setTag使得程序得以优化
58         }else{
59             holder=(ViewHolder) convertView.getTag();
60         }
61         //给控件赋值
62         holder.Image.setBackgroundResource(list.get(position).getImgId());
63         holder.Name.setText(list.get(position).getName());
64         holder.Time.setText(list.get(position).getDate());
65         holder.Contents.setText(list.get(position).getContent());
66         return convertView;
67     }
68      
69     class ViewHolder{
70         ImageView Image;
71         TextView  Name;
72         TextView  Time;
73         TextView  Contents;
74     }
75 }

 1 package cn.edu.bzu.weibo_looking;
 2  
 3 import java.util.ArrayList;
 4 import java.util.List;
 5  
 6 import cn.edu.bzu.adapter.MyAdapter;
 7 import cn.edu.bzu.entity.Information;
 8 import android.os.Bundle;
 9 import android.widget.ListView;
10 import android.app.Activity;
11  
12 public class MainActivity extends Activity {
13     private ListView listView;
14     private MyAdapter adapter;
15     private List<Information> list;
16     @Override
17     protected void onCreate(Bundle savedInstanceState) {
18         super.onCreate(savedInstanceState);
19         setContentView(R.layout.activity_main);
20         setData();//数据源
21          initView();
22     }
23     private void initView() {
24         // 初始化控件
25         listView=(ListView) findViewById(R.id.Lv);
26         listView.setAdapter(adapter);  //绑定适配器
27     }
28     private void setData() {
29         // 设置数据源
30          list=new ArrayList<Information>();
31         list.add(new Information(R.drawable.img1,"wang","2015-05-08","月落乌啼霜满天"));
32         list.add(new Information(R.drawable.img2, "dufu", "2015-05-08", "江枫渔火对愁眠"));
33         list.add(new Information(R.drawable.img3,"libai","2015-05-08","姑苏城外寒山寺"));
34         list.add(new Information(R.drawable.img4,"hades","2015-05-08","夜半钟声到客船"));
35         adapter=new MyAdapter(list, MainActivity.this);
36     }          
37 }