Android Socket Connections

Question

Trying to run a loop to check if a IP is open.

for (int z = 0; z < 100; z++) {
    String ip = "10.0.0." + z;
        try {
            log(ip);
            Socket socket = new Socket(ip, MainActivity._util.getPort());
            // Handle Stuff when Exception NOT throw
        } catch (Exception e) {
        }
}

log is a function I made (no errors there)

.getPort() is just a "global" port number I've defined EDIT : That returns 2683 (just a random number)

it is supposed to just catch the exception then move on with the for loop but that doesn't happen.

Currently this just prints:

10.0.0.0

10.0.0.1

and then freezes.

If anyone has any advice that would be great!

EDIT

using socket.connect(new InetSocketAddress(ip, port), timeout) method still didn't handle correctly
This is in an AsyncTask extended class, in the doInBackground() method

the port you get here:***MainActivity._util.getPort()*** is any chance that that int change its value when you are in the for loop??? — ΦXocę 웃 Пepeúpa ツ, Apr 16 '16 at 11:51
First off, try not to create a socket at each iteration. Further more, have a finally { socket.close() } — NSimon, Apr 16 '16 at 11:52
This code is in an extended AsyncTask class that gets executed in onCreate() — user3502489, Apr 16 '16 at 11:54
@NicolasSimon, I've tried just 'new Socket' without assigning anything, closing the Socket, adding finally, and it still doesn't work — user3502489, Apr 16 '16 at 11:56
@user3502489 How about this answer here? http://stackoverflow.com/a/14035011/4706693 — NSimon, Apr 16 '16 at 12:00
go to this link: [enter link description here](http://stackoverflow.com/questions/31611593/send-text-from-android-to-pc-via-wi-fi-connection/40820861#40820861) — Pouria Ghavidel, Nov 30 '16 at 13:26

score 2 · Accepted Answer · edited May 23 '17 at 12:13

There is no socket server to listen those IP and ports. So your socket client will be freeze. As mentioned here you should use another constructor for the socket and set timeout to prevent freezing.

for (int z = 0; z < 100; z++) {
    String ip = "10.0.0." + z;
        try {
            log(ip);
            Socket socket = new Socket();
            socket.connect(new InetSocketAddress(ip, MainActivity._util.getPort()), 1000);
            // Handle Stuff when Exception NOT throw
        } catch (Exception e) {
        }
}

Android Socket Connections

1 Answers1