@Nullable
    private Folder getFolder(final PersistableFolder folder, final boolean suppressWarningForUser) {

        if (!ensureFolder(folder.getFolder(), folder.needsWrite())) {
            reportProblem(R.string.contentstorage_err_folder_access_failed, suppressWarningForUser, folder);
            return null;
        }
        return folder.getFolder();
    }
Gets this folder's current location. If it is not accessible, then null is returned
main/src/main/java/cgeo/geocaching/storage/ContentStorage.java