Android关于连接需要Portal认证的WIFI

前言

有时候会遇到个很蛋疼的问题，访问网络时候代码的逻辑时若果当前网络连接就访问，否则就不访问。这时候如果不想在具体的代码逻辑中添加一些判断的话，遇到手机连接到需要认证登陆的wifi的情况就吃屎了。

这种需要登陆的wifi一般就是在我们发任何一个HTTP请求时候重定向到它的登录界面。这时候我想知道我是不是连接到了这样的wifi该怎么呢？其实Google提供了关于HttpURLConnection在这种情况下的判断，思路很简单就是判断请求后url的Host和请求前是否相同，代码如下

HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
try {
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
if (!url.getHost().equals(urlConnection.getURL().getHost())) {
// we were redirected! Kick the user out to the browser to sign on?

...
} finally {
urlConnection.disconnect();
}
}

那么对于HttpClient要怎么做呢？

public static String get(String url) throws IOException{
String content = null;
HttpResponse response = null;
HttpGet get = new HttpGet(url);
get.setHeader("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3");
HttpConnectionParams.setConnectionTimeout(get.getParams(), 5000);
HttpContext httpContext=new BasicHttpContext();
response = httpClient.execute(get,httpContext);
HttpHost currentHost = (HttpHost) httpContext
.getAttribute(ExecutionContext.HTTP_TARGET_HOST);
if (!currentHost.getHostName().equals(get.getURI().getHost())){
//这时候就应该是连接着需要登录的wifi
}
HttpEntity entity = response.getEntity();
content = EntityUtils.toString(entity);
return content;
}