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：

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

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

2. 一些函数的定义如下

public class CustomList extends BaseAdapter {
    	Activity activity;
    	
    	//construct
    	public CustomList(Activity a ) {
    		activity = a;
    	}
    	
		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return week.length;
		}

		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return week[position];
		}

		@Override
		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			TextView 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

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

public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			return 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!