Android 读取assets里的图片

Bitmap btimg = getImageFromAssetsFile("image/ic_launcher.png"); 

private Bitmap getImageFromAssetsFile(String fileName)  
      {  
          Bitmap image = null;  
          AssetManager am = getResources().getAssets();  
          try  
          {  
              InputStream is = am.open(fileName);  
              image = BitmapFactory.decodeStream(is);  
              is.close();  
          }  
          catch (IOException e)  
          {  
              e.printStackTrace();  
          }        
          return image;        
      }