Android中的Java反射机制应用

1. // 用反射机制来获取资源中的图片ID和尺寸  
2.             Field[] fields = R.drawable.class.getDeclaredFields();  
3.             for (Field field : fields) {  
4.                 if (!"icon".equals(field.getName()))// 除了icon之外的图片  
5.                 {  
6.                     int index = 0;  
7.                     try {  
8.                         index = field.getInt(R.drawable.class);  
9.                     } catch (IllegalArgumentException e) {  
10.                         // TODO Auto-generated catch block  
11.                         e.printStackTrace();  
12.                     } catch (IllegalAccessException e) {  
13.                         // TODO Auto-generated catch block  
14.                         e.printStackTrace();  
15.                     }  
16.                     // 保存图片ID  
17.                     imgList.add(index);  
18.                 }  
19.             }  
20.             // 取得图像大小  
21.             Bitmap bmImg = BitmapFactory.decodeResource(getResources(),  
22.                     imgList.get(0));  
23.             imgWidth = bmImg.getWidth();  
24.             imgHeight = bmImg.getHeight();