Android : How to check File Exists in MediaStore via URI

private boolean chkImgUri(Uri in_imgUri) {

    boolean res;

    ContentResolver cr = getContentResolver();
    String[] projection = {MediaStore.MediaColumns.DATA};
    Cursor cur = cr.query(Uri.parse(in_imgUri.toString()), projection, null, null, null);
    if (cur != null) {
        if (cur.moveToFirst()) {
            String filePath = cur.getString(0);
            // true= if it exists
            // false= File was not found
            res = new File(filePath).exists();

        } else {
            // Uri was ok but no entry found.
            res = false;
        }
        cur.close();
    } else {
        // content Uri was invalid or some other error occurred
        res = false;
    }

    return res;
}