放大Imageview

Question

我正在使用此代码，但我遇到了这个问题：我的图片不是静态的，在drawable文件夹上，我从网址获取它。

我必须做出哪些改变？下面是我获取图像和缩放的代码。

public class Zoom extends View {
private Drawable image;
private int zoomControler=200;
public Zoom(Context context)
{
super(context);
image=context.getResources().getDrawable(R.drawable.gallery_photo_1);
setFocusable(true);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//here u can control the width and height of the images........ this line is very important
image.setBounds((getWidth()/2)-zoomControler, (getHeight()/2)-zoomControler, (getWidth()/2)+zoomControler, (getHeight()/2)+zoomControler);

image.draw(canvas);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode==KeyEvent.KEYCODE_DPAD_UP)// zoom in
zoomControler+=10;
if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN) // zoom out
zoomControler-=10;
if(zoomControler<10)
zoomControler=10;
invalidate();
return true;
}
} 

和我的代码，以获得正常工作的图像。

try {
                          ImageView i = (ImageView)findViewById(R.id.icon);
                          Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL(url).getContent());
                          i.setImageBitmap(bitmap); 
                        } catch (MalformedURLException e) {
                          e.printStackTrace();
                        } catch (IOException e) {
                          e.printStackTrace();
                        }