Question

In my Android app I am calling a URL for fetching images and that URL is also fetched dynamically. Sometimes what happened is that the server returns the path of the image but actually there is no image so can we put some kind of validation.

Answer 1

When the url has finished loading try to decode the result into a Bitmap object with decodeByteArray or decodeStream, if it returns null the image is invalid.

byte[] data; // server response
// ...
Bitmap img = BitmapFactory.decodeByteArray(data, 0, data.length);
if (img == null) {
  // invalid image
}
else {
  // valid image
}