问从字符串值设置android图像？

ImageView image = new ImageView(context);
image.setImageDrawable(context.getResources().getDrawable(R.drawable.testimage))

ID:    Name:    ImageName:
-      Test     testimage

int image = R.drawable.blank; // blank image

// testimage.png is the image name from the database
if(imageName.toString().equals("testimage.png"))
    image = R.drawable.testimage;
else if(imageName.toString().equals("another.png"))
    image = R.drawable.another;
else if(imageName.toString().equals("etc.png"))
    image = R.drawable.etc;