Android - How to get file extension?

Question

I have a String which contains path to the some file, for ex. "/sdcard0/Lewis/cache.obb".

How I can get file extension (w/out dot) from that String?

Note: file extension can be different, for ex. ".tar.gz".

The file extension of `some-file.tar.gz` is `.gz` by the way. — Sotirios Delimanolis, Dec 21 '13 at 16:51
If you're just working with Strings and can be sure that no dot will be in the path, you can use `String extension = path.substring(0, path.lastIndexOf("."));`. — Marcel Hofgesang, Jan 21 '20 at 09:41
Otherwise when you're working with filechooser this may be helpful https://stackoverflow.com/q/53869269/3894304 — Marcel Hofgesang, Jan 21 '20 at 09:43

hichris123 · Answer 1 · 2013-12-21T16:59:27.667

6

If you have the file path/URL, you can use MimeTypeMap#getMimeTypeFromExtension() like this:

public static String getFileType(String url)
{
    String type = null;
    String extension = MimeTypeMap.getFileExtensionFromUrl(url);
    if (extension != null) {
        MimeTypeMap mime = MimeTypeMap.getSingleton();
        type = mime.getMimeTypeFromExtension(extension);
    }
    return type;
}

And then you just call it like this:

String fileType = YourClass.getFileType(file);

edited Dec 21 '13 at 16:59

answered Dec 21 '13 at 16:54

hichris123

10,145
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Does it works with files named like this "`photo.birthday.my.son.jpg`"? – Helisia Dec 21 '13 at 16:56
@user2718135 I haven't tested this code, try it and see. – hichris123 Dec 21 '13 at 16:56

score 0 · Answer 2 · answered Dec 21 '13 at 16:58

0

Try this if (fileName != null) { File imageFile = new File(fileName);

String fileType=fileName.substring(imageFile.getName().length(),fileName.length());

}

answered Dec 21 '13 at 16:58

M. Usman Afzal

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Android - How to get file extension?

2 Answers2