获取当前应用版本号

      public static String getCurrentAppVersionName(final Context mContext)

      {

               String version = "";

               if(mContext != null)

               {

                   try

                    {

       // 获取packagemanager的实例

                  PackageManager packageManager = mContext.getPackageManager();

                  // getPackageName()是你当前类的包名，0代表是获取版本信息

                  PackageInfo packInfo = packageManager.getPackageInfo(mContext.getPackageName(),0);

                  version = packInfo.versionName;

                 

                  packageManager = null;

                  packInfo = null;

            } catch (Exception e)

            {

            }finally

            {

            }

}

        return version;

 

    }