Android : 继承BaseAdapter对ListView进行填充

  1 import java.util.ArrayList;
  2 import java.util.List;
  3 
  4 import android.app.Activity;
  5 import android.content.Context;
  6 import android.os.Bundle;
  7 import android.view.LayoutInflater;
  8 import android.view.View;
  9 import android.view.ViewGroup;
 10 import android.widget.BaseAdapter;
 11 import android.widget.ListView;
 12 import android.widget.TextView;
 13 
 14 
 15 class User {
 16     private String userid;
 17     private String username;
 18 
 19     public String getUserid() {
 20         return userid;
 21     }
 22 
 23     public void setUserid(String userid) {
 24         this.userid = userid;
 25     }
 26 
 27     public String getUsername() {
 28         return username;
 29     }
 30 
 31     public void setUsername(String username) {
 32         this.username = username;
 33     }
 34 }
 35 
 36 class ViewHolder {
 37     TextView textviewUserId;
 38     TextView textviewUserName;
 39 }
 40 
 41 class UserInfoAdapter extends BaseAdapter {
 42     private LayoutInflater inflater;
 43     private List<User> list;
 44 
 45     public UserInfoAdapter(Context context, List<User> list) {
 46         // TODO Auto-generated constructor stub
 47         inflater = LayoutInflater.from(context);
 48         this.list = list;
 49     }
 50 
 51     @Override
 52     public int getCount() {
 53         // TODO Auto-generated method stub
 54         return list.size();
 55     }
 56 
 57     @Override
 58     public User getItem(int position) {
 59         // TODO Auto-generated method stub
 60         return list.get(position);
 61     }
 62 
 63     @Override
 64     public long getItemId(int position) {
 65         // TODO Auto-generated method stub
 66         return position;
 67     }
 68 
 69     @Override
 70     public View getView(int position, View view, ViewGroup viewgroup) {
 71         ViewHolder viewHolder = null;
 72         if (view == null) {
 73             view = inflater.inflate(R.layout.user_detail, null);
 74             viewHolder = new ViewHolder();
 75             viewHolder.textviewUserId = (TextView) view
 76                     .findViewById(R.id.textviewUserId);
 77             viewHolder.textviewUserName = (TextView) view
 78                     .findViewById(R.id.textviewUserName);
 79             view.setTag(viewHolder);
 80         } else {
 81             viewHolder = (ViewHolder) view.getTag();
 82         }
 83         viewHolder.textviewUserId.setText(list.get(position).getUserid());
 84         viewHolder.textviewUserName.setText(list.get(position).getUsername());
 85     }
 86 
 87 }
 88 
 89 
 90 class NewsActivity extends Activity{
 91     private List<User> list = null;
 92     private UserInfoAdapter adapter;
 93     protected void onCreate(Bundle savedInstanceState) {
 94         super.onCreate(savedInstanceState);
 95         setContentView(R.layout.news_list);
 96         list = new ArrayList<User>();
 97         //Maybe here you will call json...
 98         User user=new User();
 99         user.setUserid("001");
100         user.setUsername("Zhou, Biwen");
101         list.add(user);
102         adapter=new UserInfoAdapter(this,list);
103         ListView listView = (ListView) findViewById(R.id.userlistview);
104         listView.setAdapter(adapter);
105         
106     }
107 }
108 
109 
110 //news_detail.xml
111 //<?xml version="1.0" encoding="utf-8"?>
112 //<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
113 //android:layout_width="wrap_content"
114 //android:layout_height="wrap_content"
115 //android:orientation="horizontal">
116 //<LinearLayout
117 //android:layout_width="fill_parent"
118 //android:layout_height="wrap_content"
119 //android:orientation="vertical"
120 //android:paddingLeft="0px"
121 //android:paddingRight="5px"
122 //android:layout_marginTop="5px"
123 //android:layout_marginBottom="5px">
124 //<TextView
125 //android:id="@+id/textviewUserId"
126 //android:layout_width="wrap_content"
127 //android:layout_height="wrap_content"
128 //android:textSize="20px"
129 //android:textColor="#424952"
130 //android:layout_alignParentLeft="true">
131 //</TextView>
132 //<TextView
133 //android:id="@+id/textviewUserName"
134 //android:layout_width="wrap_content"
135 //android:layout_height="wrap_content"
136 //android:layout_alignParentRight="true"
137 //android:textColor="#f7a200"
138 //android:textSize="12px">
139 //</TextView>
140 //</LinearLayout>
141 //</LinearLayout>