这是一个bug与WWW
类并且已经在这里很长时间了。每个设备的行为可能有所不同。如果 Wifi 被禁用,它曾经在编辑器上冻结。快速测试表明该错误尚未修复。
你需要使用HttpWebRequest
代替WWW
.
在下面的例子中,Thread
用于避免请求阻塞Unity程序并且UnityThread
用于在请求完成时回调到 Unity 主线程。得到UnityThread
from this https://stackoverflow.com/questions/41330771/use-unity-api-from-another-thread-or-call-a-function-in-the-main-thread/41333540#41333540 post.
void Awake()
{
//Enable Callback on the main Thread
UnityThread.initUnityThread();
}
void isOnline(Action<bool> online)
{
bool success = true;
//Use ThreadPool to avoid freezing
ThreadPool.QueueUserWorkItem(delegate
{
try
{
int timeout = 2000;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://google.com");
request.Method = "GET";
request.Timeout = timeout;
request.KeepAlive = false;
request.ServicePoint.Expect100Continue = false;
request.ServicePoint.MaxIdleTime = timeout;
//Make sure Google don't reject you when called on mobile device (Android)
request.changeSysTemHeader("User-Agent", "Mozilla / 5.0(Windows NT 10.0; WOW64) AppleWebKit / 537.36(KHTML, like Gecko) Chrome / 55.0.2883.87 Safari / 537.36");
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
if (response == null)
{
success = false;
}
if (response != null && response.StatusCode != HttpStatusCode.OK)
{
success = false;
}
}
catch (Exception)
{
success = false;
}
//Do the callback in the main Thread
UnityThread.executeInUpdate(() =>
{
if (online != null)
online(success);
});
});
}
您需要扩展类changeSysTemHeader
函数允许“用户代理”要更改的标题:
public static class ExtensionMethods
{
public static void changeSysTemHeader(this HttpWebRequest request, string key, string value)
{
WebHeaderCollection wHeader = new WebHeaderCollection();
wHeader[key] = value;
FieldInfo fildInfo = request.GetType().GetField("webHeaders",
System.Reflection.BindingFlags.NonPublic
| System.Reflection.BindingFlags.Instance
| System.Reflection.BindingFlags.GetField);
fildInfo.SetValue(request, wHeader);
}
}
使用起来非常简单:
void Start()
{
isOnline((online) =>
{
if (online)
{
Debug.Log("Connected to Internet");
//internetMenu.SetActive(false);
}
else
{
Debug.Log("Not Connected to Internet");
}
});
}