如果检测Android设备有互联网连接

本文介绍了如果检测Android设备有互联网连接的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我需要知道我的设备有互联网连接或不。我发现很多的答案，如：

I need to tell if my device has Internet connection or not. I found many answers like:

private boolean isNetworkAvailable() { ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo(); return activeNetworkInfo != null; }

（从Detect是否有互联网连接在Android 。）

(Taken from Detect whether there is an Internet connection available on Android.)

但是，这是不对的，例如，如果我的连接到没有上网无线网络，此方法将返回true ... 有没有办法告诉如果设备有互联网连接，而不是如果只是连接到些什么呢？

But this is not right, for example if I'm connected to a wireless network which doesn't have Internet access, this method will return true… Is there a way to tell if the device has Internet connection and not if it is only connected to something?

推荐答案

你是对的。 c您的$ C $如果有网络连接所提供只检查。 最好的方法，以检查是否有可用的Internet连接是尝试连接 通过HTTP已知的服务器。

You are right. The code you've provided only checks if there is a network connection. The best way to check if there is an active Internet connection is to try and connect to a known server via http.

public static boolean hasActiveInternetConnection(Context context) { if (isNetworkAvailable(context)) { try { HttpURLConnection urlc = (HttpURLConnection) (new URL("www.google").openConnection()); urlc.setRequestProperty("User-Agent", "Test"); urlc.setRequestProperty("Connection", "close"); urlc.setConnectTimeout(1500); urlc.connect(); return (urlc.getResponseCode() == 200); } catch (IOException e) { Log.e(LOG_TAG, "Error checking internet connection", e); } } else { Log.d(LOG_TAG, "No network available!"); } return false; }

当然，您也可以替换 www.google 网​​址为你想连接到任何其他的服务器，或者你知道一个服务器具有良好正常运行时间。

Of course you can substitute the www.google URL for any other server you want to connect to, or a server you know has a good uptime.

由于托尼卓也指出，this下面发表评论，请务必不要运行在主线程此code，否则你会得到一个NetworkOnMainThread异常（在安卓3.0或更高版本）。使用的AsyncTask或Runnable接口来代替。

As Tony Cho also pointed out in this comment below, make sure you don't run this code on the main thread, otherwise you'll get a NetworkOnMainThread exception (in Android 3.0 or later). Use an AsyncTask or Runnable instead.