Xamarin Android应用程序可在模拟器上运行，使用WebRequest时在真实设备上崩溃

Question

I am using this example to get some data from a link to an Android device: https://msdn.microsoft.com/en-us/library/456dfw4f(v=vs.110).aspx

The app works fine when using the emulator (Nexus 5 with Android Kit Kat), but when I deploy it (release version) on an actual Android (Samsung S3 mini with Jellybean) the app starts, but crashes after that with "Unfortunately .. has stopped working". If I don't use WebRequest.Create, all my other components in the app work everywhere.

WebRequest request = WebRequest.Create(
            "MY LINK HERE"); //with a real link ofcourse

        request.Credentials = CredentialCache.DefaultCredentials;
        WebResponse response = request.GetResponse();


        Stream dataStream = response.GetResponseStream();

        StreamReader reader = new StreamReader(dataStream);

        string responseFromServer = reader.ReadToEnd()

        reader.Close();
        response.Close();

Answer 1

I fixed the ussue. I didn't know that I had to set permission to use internet.

Project->Project Options->Build->Android Application->Required permission-> Tick the Internet checkbox and press OK.

Answer 2

Enable Internet permission for App in AndroidManifest.xml file under Properties as follows:

 <uses-permission android:name="android.permission.INTERNET" /> 

or enable through wizard from following steps:

• Right click over project and Properties
• Under Android Manifest
• enable checkbox for Internet under Required Permissions

Hope this helps