从 Play 商店 xamarin 获取最新的应用程序版本 [英] Getting latest app version from play store xamarin

问题描述

如何从 Google Play 商店获取最新的 Android 应用程序版本?以前使用下面的代码来这样做

How can I get latest android app version from Google play store? Earlier to used to do so by using below code

using (var webClient = new System.Net.WebClient())
{
    var searchString = "itemprop="softwareVersion">";
    var endString = "</";
    //possible network error if phone gets disconnected
    string jsonString = webClient.DownloadString(PlayStoreUrl);
    var pos = jsonString.IndexOf(searchString, StringComparison.InvariantCultureIgnoreCase) + searchString.Length;
    var endPos = jsonString.IndexOf(endString, pos, StringComparison.Ordinal);
    appStoreversion = Convert.ToDouble(jsonString.Substring(pos, endPos - pos).Trim());
    System.Diagnostics.Debug.WriteLine($"{currentVersion} :: {appStoreversion}");
    System.Diagnostics.Debug.WriteLine($"{appStoreversion > currentVersion}");
    if ((appStoreversion.ToString() != currentVersion.ToString() && (appStoreversion > currentVersion)))
    {
        IsUpdateRequired = true;
    }
}

&下面的代码甚至抛出异常

& the code below even throwing exception

  var document = 
    Jsoup.Connect("https://play.google.com/store/apps/details?id=" + "com.spp.in.spp" + "&hl=en")
    .Timeout(30000)
    .UserAgent("Mozilla/5.0 (Windows; U; WindowsNT 5.1; en-US; rv1.8.1.6) Gecko/20070725 Firefox/2.0.0.6")
    .Referrer("http://www.google.com")
    .Get();

接收:

Android.OS.NetworkOnMainThreadException:类型异常'Android.OS.NetworkOnMainThreadException' 被抛出.在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

Android.OS.NetworkOnMainThreadException: Exception of type 'Android.OS.NetworkOnMainThreadException' was thrown. at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw ()

但现在 Play 商店似乎几乎没有改变条件，因此现有功能被破坏了.很少有类似的线程在这里可用，但那些似乎已经过时了.

But now Play store seems to change few conditions, so existing functionality is broke down. Few similar threads are already available here however those seems to have outdated.

推荐答案

这将返回基于字符串的版本，至少在 Google 再次更改 html 页面内容之前.

This will return a string-based version, at least until Google changes the html page contents again.

var version = await Task.Run(async () =>
{
    var uri = new Uri($"https://play.google.com/store/apps/details?id={PackageName}&hl=en");
    using (var client = new HttpClient())
    using (var request = new HttpRequestMessage(HttpMethod.Get, uri))
    {
      request.Headers.TryAddWithoutValidation("Accept", "text/html");
      request.Headers.TryAddWithoutValidation("User-Agent", "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0");
      request.Headers.TryAddWithoutValidation("Accept-Charset", "ISO-8859-1");
      using (var response = await client.SendAsync(request).ConfigureAwait(false))
      {
            try
            {
                response.EnsureSuccessStatusCode();
                var responseHTML = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
                var rx = new Regex(@"(?<=""htlgb"">)(d{1,3}.d{1,3}.{0,1}d{0,3})(?=</span>)", RegexOptions.Compiled);
                MatchCollection matches = rx.Matches(responseHTML);
                return matches.Count > 0 ? matches[0].Value : "Unknown";
            }
            catch
            {
                return "Error";
            }
          }
      }
   }
);
Console.WriteLine(version);

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