From your code, it seems possible that you are downloading a local resource, not from the Internet. If this is the first case, you can simply download it as
fooobar.com/questions/29828 / ...
If not, and you are uploading a web image, then this can be a lot of problems, here are some hopefully useful troubleshooting methods.
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
- ( adavis)? , .
Log.wtf("Testing valid URL", "|"+url+"|")
?
.
? , - ,
android:src="@mipmap/large xml ImageView