当WIFI连接互联网如何检测？ [英] How to detect when WIFI is connected to internet?

问题描述

我建立一个Android应用程序，我使用下面的code，以检测是否有网络连接。它运作良好，并检测移动和WIFI网络。

I am building an Android app and I use the code below to detect whether there is a network connection. It works well and detects both mobile and WIFI networks.

我的问题是如何检测一个实际的网络连接。当连接到WIFI但是WIFI不一定被连接到互联网的code以下返回true。

My problem is how to detect an actual internet connection. The code below returns true when connected to WIFI however the WIFI might not necessarily be connected to the Internet.

的code 的

The code

    protected boolean checkInternetConnection() {     
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);  
    // test for connection     
    if (cm.getActiveNetworkInfo() != null             
            && cm.getActiveNetworkInfo().isAvailable()             
            && cm.getActiveNetworkInfo().isConnected()) {

        return true;

        } 
    else {               
        return false;

        } 

} //end checkInterneConnection method

感谢您的时间。

梅尔

推荐答案

您应该尝试访问Internet ADRESS。因此，你应该检查InetAdress类和方法isReachable：的http://developer.android.com/reference/java/net/InetAddress.html#isReachable%28int%29

You should try to reach an internet adress. Therefor you should check the InetAdress class and the method isReachable: http://developer.android.com/reference/java/net/InetAddress.html#isReachable%28int%29

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