java.net.SocketException异常：地​​址族不是由Android模拟器支持协议

问题描述

我试图运行简单的应用程序从Android模拟器访问互联网，这里是我的code。我身后的代理，并在仿真器配置代理服务器设置由......无线网络 - > APN - > ...。但是，互联网是从浏览器的工作，而不是从应用程序。

I am trying to run simple application to access internet from android emulator and here is my code. I am behind proxy and configured proxy settings in emulator by"...Wireless Networks -> APN -> ..." . But internet is working from browser and not from application.

            HttpURLConnection connection = null;
    String URLName = "http://www.google.com";

    try {
        URL u = new URL(URLName);
        connection = (HttpURLConnection) u.openConnection();
        connection.setRequestMethod("HEAD");
        int code = connection.getResponseCode();
        Log.d(TAG1, " " + code);
        // You can determine on HTTP return code received. 200 is success.
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        Log.d(TAG1, e.toString());
    }

    finally {
        if (connection != null) {
            connection.disconnect();
        }
    }

错误日志中的logcat的部分如下：

The part of error log in Logcat is as follows:

01-11 01:01:26.308: DEBUG/SntpClient(72): request time failed: java.net.SocketException: Address family not supported by protocol

01-11 01:02:39.909: WARN/System.err(422): java.net.SocketException: The operation timed out

我试过下列选项中搜索论坛后，但他们都不似乎工作：

I tried the following options after searching in forum but none of them seems working:

1. 在Android的启动选项我用-http代理服务器：端口-dns服务器服务器

1. In android launch options I used -http-proxy server:port -dns-server server

我已经包括在清单文件权限互联网

I have included internet permissions in manifest file

使用许可权的android：NAME =android.permission.INTERNET对

uses-permission android:name="android.permission.INTERNET"

uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" 

设置系统属性来使用IPv4协议栈有人建议在

Set the system properties to use ipv4 stack after someone suggested

        java.lang.System.setProperty("java.net.preferIPv4Stack", "true");
java.lang.System.setProperty("java.net.preferIPv6Addresses", "false");

我的工作在Android 2.2和Windows Vista中，你可以请帮我在这里...

I am working on Android 2.2 and windows vista, can you please help me here...

推荐答案

请试试这个：

HttpURLConnection con =null;

URL url = new URL("abcdefg");

Proxy proxy=new Proxy(java.net.Proxy.Type.HTTP, new InetSocketAddress(android.net.Proxy.getDefaultHost(),android.net.Proxy.getDefaultPort()));

con = (HttpURLConnection) url.openConnection(proxy);

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