Unity - WWW.text 在 Android 设备上返回 null [英] Unity - WWW.text returning null on android device

问题描述

我正在使用 Unity 开发 Android 应用程序.但是我无法使用它连接到 Internet 服务器.这给出了错误，这很好:Application.internetReachability == NetworkReachability.NotReachable

I am developing an Android app with Unity. But I cannot connect to a internet server with it. Tho this gives false, which is good: Application.internetReachability == NetworkReachability.NotReachable

但是当尝试执行此代码段时:

But when trying to execute this snippet:

IEnumerator testConnection() {
    Dictionary<string, string> header = new Dictionary<string, string>();
    string userAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36";
    header.Add("User-Agent", userAgent);
    WWW www = new WWW("www.google.com", null, header);
    yield return www;
    // check for errors
    if (www.error == null) {
        util.debug("works");
    } else {
        // www.error and www.text both are empty
        util.debug("testing: WWW Error: " + www.error + www.text); 
    }
}

它通过统一编辑器和 Windows 可执行文件工作，但不适用于我的 android 设备 (v 6)有没有已知的解决方案?

it works via unity editor and windows executable, but not on my android device (v 6) Is there a known solution to this?

Ping 似乎也有效:

Ping also seem to work:

IEnumerator PingGoogle() {
    Ping googPing  = new Ping("172.217.6.195");

    while (!googPing.isDone) {
        yield return googPing;
    }
    util.debug("ping works: " + googPing.time); //I reach this point with the app
}

所以我认为 WWW 类有问题?

So i think something is wrong with the WWW-class?

安卓版本:6.0.1

OxygenOS 版本:3.5.6

OxygenOS-Version: 3.5.6

Unity 版本:5.6.0b3 个人版(64 位)

Unity version: 5.6.0b3 Personal (64bit)

我将 Internet Access 的 PlayerSettings(据我所知，这是 android 清单)从 Auto 更改为 Require.没有成功

I changed the PlayerSettings (which is the android manifest as far as i can tell) of Internet Access from Auto to Require. No success

编辑 2:看起来 www.error 根本不是空的.消息刚刚被截断，因为它对于 unitys-textelement 来说太长了(我的错).错误是 java.net.MalformedURLException: Protocol not found: www.google.de.所以唯一缺少的是协议，即:http://.当我从评论中尝试建议的解决方案时，我发现了这个问题.

It appears that www.error wasnt empty at all. The Message just got truncated because it was too long for unitys-textelement (my fault). The error was java.net.MalformedURLException: Protocol not found: www.google.de. So the only thing that was missing was the protocoll, i.e.: http://. I found this problem when i tried a suggested solution from the comments.

推荐答案

我对您修改后的代码进行了快速测试，但仍然无法正常工作，并出现此运行时异常:

I ran a quick test with your modified code that is still not working and got this run-time exception:

java.net.MalformedURLException:未找到协议

java.net.MalformedURLException: Protocol not found

遇到此类问题时使用 Android Monitor 总是好的.

It's always good to use Android Monitor when having such problems like this.

问题是您没有在 url 前面加上 http:// 或 https:// 前缀.Android 不支持它，所以这就是它在编辑器上工作但在 Android 上不工作的原因.

The problem is that you did not prefix the url with http:// or https://. Android does not support that so that's why it worked on the Editor but not on Android.

当您尝试在 url 中嵌入用户名和密码时，也会发生同样的事情.例如，http://username:[e-mail].

The-same thing happens also happens when you try to embed user name and password in a url. For example, http://username:[e-mail].

这适用于 Windows 和编辑器，但不能适用于 Android，但有一个修复 为它.

This will work on Windows and the Editor but will not work on Android but there is a fix for it.

这应该有效:

IEnumerator testConnection()
{
    Dictionary<string, string> header = new Dictionary<string, string>();
    string userAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36";
    header.Add("User-Agent", userAgent);
    WWW www = new WWW("http://www.google.com", null, header);
    yield return www;
    // check for errors
    if (www.error == null)
    {
        util.debug("works");
    }
    else
    {
        // www.error and www.text both are empty
        util.debug("testing: WWW Error: " + www.error + www.text);
    }
}

提示:

当从 Unity 应用程序向不属于您的服务器发出网络请求时 (http://www.google.com)，添加 user-agent 标头总是一个好主意，否则当您的应用发布时，请求会在某些设备上失败.

When making a web request from Unity app to a server that does not belong to you (http://www.google.com), it is always a good idea to add user-agent header or expect the request to fail on some devices when your app is released.

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