调试中通过android simulator模拟器链接localhost或者127.0.0.1,因为我在电脑上面建立了apache,我的代码大概就是
URL url = new URL(urlString); 
    URLConnection urlconn = url.openConnection();

但是报错了!!

Exception 1:java.net.ConnectException: localhost/127.0.0.1:8080 - 
Connection refused

问题是这样的,android模拟器(simulator)把它自己作为了localhost,也就是说,代码中使用localhost或者127.0.0.1来访问,都是访问模拟器自己!这是不行的!

如果你想在模拟器simulator上面访问你的电脑,那么就使用android内置的IP 10.0.2.2 吧,  10.0.2.2 是模拟器设置的特定ip,是你的电脑的别名alias

记住,在模拟器上用10.0.2.2访问你的电脑本机

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