/**

     * 获取当前应用程序的版本号

     */

    private String getVersion() {

        String st = getResources().getString(R.string.Version_number_is_wrong);

        PackageManager pm = getPackageManager();

        try {

            PackageInfo packinfo = pm.getPackageInfo(getPackageName(), 0);

            String version = packinfo.versionName;

            return version;

        } catch (NameNotFoundException e) {

            e.printStackTrace();

            return st;

        }

    }