Activity

private String getVersionName() throws Exception
   {
           PackageManager packageManager = getPackageManager();
           PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(),0);
           String versionName = packInfo.versionName;
           String versionCode = packInfo.versionCode;
           return versionName;
   }

Fragment

private String getVersionName() throws Exception
    {
   
        PackageManager packageManager = this.getActivity().getPackageManager();
        PackageInfo packInfo = packageManager.getPackageInfo(this.getActivity().getPackageName(),0);
        String versionName = packInfo.versionName;
        return versionName;
    }