add support for starting the account selector from activities (and not only from fragments)

        return findAccounts(context).size() > 0;

    }

    public static void pickNewAccount(Activity activity) throws NextcloudFilesAppNotInstalledException {

        if (appInstalledOrNot(activity, "com.nextcloud.client")) {

            Intent intent = AccountManager.newChooseAccountIntent(null, null, new String[]{"nextcloud"},

                    true, null, null, null, null);

            activity.startActivityForResult(intent, CHOOSE_ACCOUNT_SSO);

        } else {

            throw new NextcloudFilesAppNotInstalledException();

        }

    }

    public static void pickNewAccount(Fragment fragment) throws NextcloudFilesAppNotInstalledException {

        if (appInstalledOrNot(fragment.getContext(), "com.nextcloud.client")) {

            // Clear all tokens first to prevent some caching issues..

            //clearAllAuthTokens(fragment.getContext());

            Intent intent = AccountManager.newChooseAccountIntent(null, null, new String[]{"nextcloud"},

                    true, null, null, null, null);

            fragment.startActivityForResult(intent, CHOOSE_ACCOUNT_SSO);