Support library ExifInterface check if attribute exists or get all attributes

Question

The support library version 25.1.0 has added a new feature the ExifInterface, which back-ports features added to the ExifInterface in Android 7.1.

But how do I check if a specific file actually has a specific int or double attribute without providing a default value? Or is there an option to get a list of attributes?

Answer 1

There is no ready-to-use hasAttribute method, which would be quite convenient, but instead you could use the String getAttribute method, which returns null when the file does not contain the requested attribute.

Something like this:

public static boolean hasAttribute(ExifInterface exif, String attribute){
    return exif.getAttribute(attribute) != null;
}

Unfortunately there is no method to obtain all attributes from a given file.