如何通过URL获得网络上的图片

private Drawable loadImage(String url) {

try {
       return Drawable.createFromStream(
      (InputStream) new URL(url).getContent(), "test");
} catch (MalformedURLException e) {
Log.e("exception", e.getMessage());
} catch (IOException e) {
Log.e("exception", e.getMessage());
}
return null;
}