public boolean delete(final Uri uri) {
        if (isEmpty(uri)) {
            return false;
        }
        try {
            return getAccessorFor(uri).delete(uri);
        } catch (IOException ioe) {
            reportProblem(R.string.contentstorage_err_delete_failed, ioe, false, uri);
        }
        return false;
    }
Deletes the file represented by given Uri
main/src/main/java/cgeo/geocaching/storage/ContentStorage.java