Xamarin.Forms 弹出“新版本可用”

Question

我正在开发 Xamarin.forms Android 项目，我正在寻找为用户显示弹出窗口：

新版本可用

当用户尝试打开应用程序并且 Play-store 上有新的更新可用时。

Answer 1

我认为最简单的方法是在您自己的服务器上拥有一个返回当前版本号的 Web 服务，不幸的是，您每次在商店中更新应用程序时都需要更新此版本号。

Answer 2

在 GitHub Gist 帐户中创建具有最新版本号的文本文件。

获取原始网址

字符串 url = "https://gist.githubusercontent.com/YOUR_ACCOUNT_NAME/0df1fa45aa11753de0a85893448b22de/raw/UpdateInfo.txt";

private static async Task<string> GetLatestVersion(string URL)
    {
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri(URL));
        request.ContentType = "application/json"; //i am using a json file 
        request.Method = "GET";
        request.Timeout = 20000;
        // Send the request to the server and wait for the response:
        try
        {
            using (WebResponse response = await request.GetResponseAsync())
            {
                // Get a stream representation of the HTTP web response:
                using (Stream stream = response.GetResponseStream())
                {                    
                    StreamReader reader = new StreamReader(stream);
                    return reader.ReadToEnd();
                }
            }
        }
        catch (Exception ex)
        {
            return string.Empty;
        }
    }

这将返回您应用的最新版本。并检查活动中现有的应用程序版本

var versionName = Application.Context.ApplicationContext.PackageManager.GetPackageInfo(Application.Context.ApplicationContext.PackageName, 0).VersionName;
        var currentVer = double.Parse(versionName);

但您必须在任何时候在 Play 商店中更新应用时更新此版本号。

Answer 3

private class GetVersionCode extends AsyncTask<Void, String, String> {
    @Override
    protected String doInBackground(Void... voids) {

        String newVersion = null;
        try {
            newVersion = Jsoup.connect("https://play.google.com/store/apps/details?id=" + SplashActivity.this.getPackageName() + "&hl=it")
                    .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()
                    .select("div[itemprop=softwareVersion]")
                    .first()
                    .ownText();
             return newVersion;
        } catch (Exception e) {
            return newVersion;
        }
    }

    @Override
    protected void onPostExecute(String onlineVersion) {
        super.onPostExecute(onlineVersion);
        String currentVersion = null;
        try {
            currentVersion = getPackageManager().getPackageInfo(getPackageName(), 0).versionName;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        if (onlineVersion != null && !onlineVersion.isEmpty()) {
            if (Float.valueOf(currentVersion) < Float.valueOf(onlineVersion)) {

                    final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(SplashActivity.this);
                    alertDialogBuilder.setTitle("Product Update");
                    alertDialogBuilder.setMessage("A new version is available. Would you like to Upgrade now? (Current: "+currentVersion+" Latest: "+onlineVersion+")");
                    alertDialogBuilder.setPositiveButton("ok",
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface arg0, int arg1) {
                                    startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id="+SplashActivity.this.getPackageName())));
                                }
                            });

                    alertDialogBuilder.setNegativeButton("Cancel",new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            alertDialogBuilder.setCancelable(true);
                            finish();
                            loginUserCheck();
                        }
                    });

                    AlertDialog alertDialog = alertDialogBuilder.create();
                    alertDialog.show();
             }