How to know the filetype?

Question

I want to know whether the file is Audio(mp3,aac, etc), Video(mp4,wmv,3gp,etc), Document(txt,rtf,doc,docx,xls,xlsx,ppt,html etc) or Unknown (with no extension and other custom extension specific for one single application in the near future)

I need to implement it in Android. I think I could find the extension of file and identifying its type? Or do I not need to know the extension?

I just want to know the file-type.

I used the class that was posted as an answer here: http://stackoverflow.com/a/10140531/293280 — Joshua Pinter, Mar 18 '14 at 07:57

Prasad S Deshpande · Answer 1 · 2012-09-24T08:39:19.363

import java.net.FileNameMap;
import java.net.URLConnection;

public class FileUtils {

public static String getMimeType(String fileUrl)
  throws java.io.IOException {
      FileNameMap fileNameMap = URLConnection.getFileNameMap();
      String type = fileNameMap.getContentTypeFor(fileUrl);

     return type;
}

public static void main(String args[]) throws Exception {
      System.out.println(FileUtils.getMimeType("file://c:/temp/test.TXT"));
     // output :  text/plain
   }
}

http://www.rgagnon.com/javadetails/java-0487.html

Ondřej Z · Answer 2 · 2012-09-24T07:57:44.203

on Android, you can try something like this:

File f = <YOUR FILE>

String path = f.getAbsolutePath();
String fileExtension = null;
int dotPos = path.lastIndexOf('.');
if (0 <= dotPos) {
    fileExtension = path.substring(dotPos + 1);
}

if (!TextUtils.isEmpty(fileExtension )) {
    String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(fileExtension.toLowerCase());
    if (!TextUtils.isEmpty(mime)) {
        if (mime.startsWith("text")) {
        // TEXT FILE
        } else if (mime.startsWith("image")) {
        // IMAGE FILE
        }
    }
}

score 0 · Accepted Answer · answered Sep 24 '12 at 07:51

0

You can either try to guess the file type from the filename extension using guessContentTypeFromName(), or you can try to guess the file type from the content using guessContentTypeFromStream().

answered Sep 24 '12 at 07:51

UgglyNoodle

3,017
1
21
17

2

If you look at the source of `URLConnection.guessContentTypeFromStream()` you'll see it only knows about HTML, XML, zip files, and GIF images. It can't identify most of the file types the question asks for. `guessContentTypeFromName()` has a larger database, but the questioner specifically asked to identify files with no extension. – Dan Hulme Apr 22 '13 at 12:43

score 0 · Answer 4 · answered Sep 24 '12 at 09:08

You can use mime-util library. My sample code will get the mime type of the file.

    String imagePath = "/tmp/test.txt";
    File file = new File(imagePath);

    if (MimeUtil.getMimeDetector(MagicMimeMimeDetector.class.getName()) == null)  {
        MimeUtil.registerMimeDetector(MagicMimeMimeDetector.class.getName());
    }
    Collection<MimeType> mimeTypes = MimeUtil.getMimeTypes(file);
    for (MimeType mimeType : mimeTypes) {
        System.out.println(mimeType.getMediaType());
    }

score 0 · Answer 5 · answered Jan 13 '14 at 05:23

The shortest way to find out file extension is using lastIndexOf('.') assuming file name contains extension. Check the following code

String fileName = "test.jpg";
int i = fileName.lastIndexOf('.');
String fileExtension = fileName.substring(i+1);
Log.v("FILE EXTENSION: ",fileExtension);

How to know the filetype?

5 Answers5

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