getVersionName method

 //Get the version name
    private String getVersionName(Context context) {
        PackageInfo pInfo = null;
        try {
            pInfo = context.getPackageManager().getPackageInfo(getPackageName(), 0);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return pInfo.versionName;
    }