Correction: InetAddress.isReachable() does not 'send the ICMP ECHO'. It tries to work around the Android/Java limitation of not being able to craft and send an ICMP packet by 1) Sending a tcp connect on the echo port (port 7) 2) Recognizing a response (any response whether a successful connect OR a reset) as an indication that the destination exists At best this is a hack. Port 7 is generally not allowed by firewalls and therefore this method rarely works for hosts outside your own subnet. The only way (as far as i know) to 'ping' in non-rooted standard-issue Android is by using the command-line 'ping' utility. I would love to know other ways of pinging if anyone else knows.
On Aug 24, 10:59 am, Daniel Drozdzewski <[email protected]> wrote: > On 18 August 2011 20:39, Luiz Carvalho <[email protected]> wrote: > > > Hello Guys > > > I've got a problem. > > I can't run ping on emulator, even rooted, only in my Galaxy 5. > > > Using this procedure: > > > proc = Runtime.getRuntime (). exec ("su"); > > DataProc = new DataOutputStream > > DataOutputStream (proc.getOutputStream ()); > > dataProc.writeBytes ("exec pingwww.google.com-c2 \ n"); > > > I get the response in the device, but in the emulator no have > > answers. > > > I need of the statistics generated by ping. > > > Can anyone help me? > > Is there some spacing issue in your command line: "-c 2" ? > > There is much better solution: > > use InetAddress.isreachable(). It does send the ICMP ECHO (i.e. ping). > > You can get your stats by timing this call (or multiple calls). > > -- > Daniel Drozdzewski -- 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
