On Mon, Dec 27, 2010 at 12:46 PM, bc <[email protected]> wrote: > I am stumped. InetAdress.isReachable simply does not work. By that I > mean, it always returns false for an external host. > > I have tried searching the internet to see if anybody else is having > the same problem, I have found a few people have had the same problem, > but cannot really find an explanation why. > > I have tried this on multiple devices with the same result. > > boolean blnResult = > InetAddress.getByName("localhost").isReachable(20000); > > The above line of code works every time. If I change the "localhost" > to an external host that I can verify "isReachable", the result is > always false. > > blnResult = > InetAddress.getByName("www.google.com").isReachable(20000); > blnResult = InetAddress.getByName("4.2.2.2").isReachable(20000); > > The above lines always return false, even though I can use a terminal > emulator on the same device and get a true result. > > Can somebody more experienced with Android or perhaps a Google > engineer please give a plausible explanation for this.
http://stackoverflow.com/questions/2935325/android-debugging-inetaddress-isreachable isReachable() attempts to connect to port 7, which may be eaten by firewalls. This is a legacy holdover from Java -- I would recommend trying to do something more meaningful, like an HTTP GET request on a known good URL if you are trying to see if a Web service is reachable. -- Mark Murphy (a Commons Guy) http://commonsware.com | http://github.com/commonsguy http://commonsware.com/blog | http://twitter.com/commonsguy Warescription: Three Android Books, Plus Updates, One Low Price! -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
