How to detect when WIFI is connected to internet?

Question

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.

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.

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

Thanks for your time.

Mel

Answer 1

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