Async Get Request Android?

Question

Hello everyone, I need your help.

Simple task: when user push the button, we need to send GET request to server(response is not necessary). The next code is working on the computer, but is not working on the Android.

 public void Send(string arg)
 {
     WebRequest request = WebRequest.Create("http://x.x.x.x/server/?value=" + arg);
     DoWithResponse(request, (response) => {
         var body = new StreamReader(response.GetResponseStream()).ReadToEnd();
         Debug.Log(body);
     });
 }

 void DoWithResponse(WebRequest request, Action<HttpWebResponse> responseAction)
 {
     Action wrapperAction = () =>
     {
         request.BeginGetResponse(new AsyncCallback((iar) =>
                                                    {
             var response = (HttpWebResponse)((HttpWebRequest)iar.AsyncState).EndGetResponse(iar);
             responseAction(response);
         }), request);
     };
     wrapperAction.BeginInvoke(new AsyncCallback((iar) =>
                                                 {
         var action = (Action)iar.AsyncState;
         action.EndInvoke(iar);
     }), wrapperAction);
 }

How can I resolve this?

Answer 1

Answer by TreyH · Sep 25, 2018 at 07:23 PM

For Android and non-windows, you will want to use the Unity web request objects.

 using System;
 using UnityEngine;
 using UnityEngine.Networking;
 
 public class RequestExample : MonoBehaviour 
 {
     void Start()
     {
         this.StartCoroutine(AsyncRequest("https://www.google.com", this.RequestCallback));
     }
 
     private IEnumerator AsyncRequest(string url, Action<UnityWebRequest> callback)
     {
         // Start with the default Get configuration
         var request = UnityWebRequest.Get(url);
 
         // Configure the request
         request.SetRequestHeader("X-Some-Header", "Header Value");
 
         // Yield during the request
         yield return request.SendWebRequest();
 
         // Use the callback
         callback(request);
     }
 
     private void RequestCallback(UnityWebRequest request)
     {
         // Just print to the console
         Debug.LogFormat("Response Code: {0}\nResponse Text: {1}", request.responseCode, request.downloadHandler.text);
     }
 }

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PeterPam · Sep 26, 2018 at 02:23 PM 0

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Run async in computer, but not on Android devices.

TreyH PeterPam · Sep 26, 2018 at 03:06 PM 0

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So you want it to be a synchronous request on mobile? What are you asking and what have you tried?

PeterPam TreyH · Sep 26, 2018 at 03:31 PM 0

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The case:

I have an app for Android. This app needs to make a query on server table at start. I need the app is shown and once i got the query result, show it. No problem about the time spent in query.

When i try with coroutine, the app is waiting to have the result with white screen (in my case is the background for splash) and once have the result, shows the first screen of my app.

After lot of work, i got a way in order the app opens and do the stuff after shown the first screen of app. With this, the app is opened and when i got the result, it is shown:

 public async void codeCheck()
     {
         await Task.Run(() =>
         {
             //do the stuff//
         });
     }

This system is working for me, but... i can't use it with "old" webservices system, as once i update to .NET 4.x webservices doesn't work anymore. Then, i'm trying to use your system to get some data from DB. And i have the problem explained. If there is anyway to use the code show with yours, i think will be perfect!

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Answer 2

Answer by PeterPam · Sep 26, 2018 at 02:17 PM

@TreyH How to proceed if i do not want to wait for response from server? i mean if i want to do "write-row" async without wait for result and continue execution. Thanks in advance.

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TreyH · Sep 26, 2018 at 02:27 PM 0

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That is how the example works. You aren't waiting for anything, you call the request as a coroutine then go about your business. Nothing is held up or waiting on a response. When the response arrives, it will be available through the callback.

TreyH · Sep 26, 2018 at 02:29 PM 1

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To see this, use this for your Start function in that example:

 void Start()
 {
     // This starts an async process
     this.StartCoroutine(AsyncRequest("https://www.google.com", this.RequestCallback));
     
     // This will be called right after that
     Debug.Log("I was called without waiting for that request!");
 }

Async Get Request Android?

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