How to determine MIME type of file in android?

First and foremost, you should consider calling MimeTypeMap#getMimeTypeFromExtension(), like this:

// url = file path or whatever suitable URL you want.public static String getMimeType(String url) {    String type = null;    String extension = MimeTypeMap.getFileExtensionFromUrl(url);    if (extension != null) {        type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);    }    return type;}

Detect mime type of any file

public String getMimeType(Uri uri) {               String mimeType = null;    if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme())) {        ContentResolver cr = getAppContext().getContentResolver();        mimeType = cr.getType(uri);    } else {        String fileExtension = MimeTypeMap.getFileExtensionFromUrl(uri                .toString());        mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(                fileExtension.toLowerCase());    }    return mimeType;}

The MimeTypeMap solution above returned null in my usage. This works, and is easier:

Uri uri = Uri.fromFile(file);ContentResolver cR = context.getContentResolver();String mime = cR.getType(uri);