自定义ListView中的item

[功能]
* AdapterView
- ListView
- GridView
- Gallery
- Spinner

* Adapter
- SimpleAdapter
- SimpleCursorAdapter
- ArrayAdapter

至于 AdapterView & Adapter 如何选择的问题 有2点需要注意：
× AdapterView  的选择 只和界面有关 和具体数据无关
× Adapter 的选择 只喝数据有关 和界面无关
二者耦合度高 互不干涉!

android给出的AdapterView中所使用的Adapter的item都是TextView 即 只能显示一下文字信息 这就限制了它的应用 所以现在告诉大家怎么使用别的View


[思路]
1. 自定义一个 extends BaseAdapter 的 class 如 public class CustomList extends BaseAdapter
2. 填充 CustomList 的一些方法 如下：

Java代码

1. public int getCount()   
2. public Object getItem(int position)   
3. public long getItemId(int position)   
4. public View getView(int position, View convertView, ViewGroup parent)  

public int getCount()public Object getItem(int position)public long getItemId(int position)public View getView(int position, View convertView, ViewGroup parent)

[代码]
1. 比如 现在有下列数据 要求显示之

Java代码

1. String[] week = {   
2.     "JAN","FEB","MAR","APR",   
3.             "MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC "  
4.     };  

String[] week = {"JAN","FEB","MAR","APR",            "MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC "};

2. 一些函数的定义如下

Java代码

1. public class CustomList extends BaseAdapter {   
2.         Activity activity;   
3.            
4.         //construct   
5.         public CustomList(Activity a ) {   
6.             activity = a;   
7.         }   
8.            
9.         @Override  
10.         public int getCount() {   
11.             // TODO Auto-generated method stub   
12.             return week.length;   
13.         }   
14.   
15.         @Override  
16.         public Object getItem(int position) {   
17.             // TODO Auto-generated method stub   
18.             return week[position];   
19.         }   
20.   
21.         @Override  
22.         public long getItemId(int position) {   
23.             // TODO Auto-generated method stub   
24.             return position;   
25.         }   
26.   
27.         @Override  
28.         public View getView(int position, View convertView, ViewGroup parent) {   
29.             // TODO Auto-generated method stub   
30.             TextView tv = new TextView(activity);   
31.             tv.setText(week[position]);   
32.             return tv;   
33.         }   
34.            
35.     }  

public class CustomList extends BaseAdapter {    Activity activity;        //construct    public CustomList(Activity a ) {    activity = a;    }    @Overridepublic int getCount() {// TODO Auto-generated method stubreturn week.length;}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn week[position];}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubTextView tv = new TextView(activity);tv.setText(week[position]);return tv;}        }

3. 考虑到美观 我们可以把getView()的一些填充提取出来 即 根据目标的position 得到目标所需View

Java代码

1. public View addCustomView(int position){   
2.             View view = new View(activity);   
3.                
4.             switch(position){   
5.             case 11:   
6.                 Button btn = new Button(activity);   
7.                 btn.setText("Yes!");   
8.                    
9.                 view = btn;   
10.             case 12:   
11.                 ImageView iv = new ImageView(activity);   
12.                 iv.setImageResource(R.drawable.robot);   
13.                    
14.                 view = iv;   
15.                    
16.                 break;   
17.             default:   
18.                 TextView tv = new TextView(activity);   
19.                 tv.setGravity(1);   
20.                 tv.setText(week[position]);   
21.                 tv.setPadding(5, 5, 5, 5);   
22.                 view = tv;   
23.             }   
24.                
25.             return view;   
26.         }  

public View addCustomView(int position){View view = new View(activity);switch(position){case 11:Button btn = new Button(activity);btn.setText("Yes!");view = btn;case 12:ImageView iv = new ImageView(activity);iv.setImageResource(R.drawable.robot);view = iv;break;default:TextView tv = new TextView(activity);tv.setGravity(1);tv.setText(week[position]);tv.setPadding(5, 5, 5, 5);view = tv;}return view;}

4. 如何使用

Java代码

1. public View getView(int position, View convertView, ViewGroup parent) {   
2.             // TODO Auto-generated method stub   
3.             return addCustomView(position);   
4.         }  

public View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubreturn addCustomView(position);}

这样 我们如果要定制某个position的View 就可以增加相应的case..


done!

 

转载来自：http://www.javaeye.com/topic/568927