Android: Check connection to server

Question

So I have a method that checks if the device is connected to the internet based on this one

It works ok, but in a couple of cases I find that although the phone shows being connected to the internet, it still does not have access to my server. What I am really looking to do it check connection to my specific URL.

How could I implement that?

ahodder · Accepted Answer · 2012-09-20T19:33:40.363

25

You could do something like:

public boolean isConnectedToServer(String url, int timeout) {
    try{
        URL myUrl = new URL(url);
        URLConnection connection = myUrl.openConnection();
        connection.setConnectTimeout(timeout);
        connection.connect();
        return true;
    } catch (Exception e) {
        // Handle your exceptions
        return false;
    }
}

This will attempt to connect to your server's URL and if it fails, you obviously don't have a connection. ;-)

edited Sep 20 '12 at 19:33

answered Feb 07 '12 at 16:42

ahodder

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your down vote may have been because you specify timeout as a long, but .setConnectTimeout (which you miss-spelled) only accepts an int value. – Evan R. Sep 20 '12 at 18:22
@levi, I'm not sure what you are getting at, so my answer would have to be don't do it? – ahodder Sep 17 '14 at 20:32
I mean, this method should be run background. If not it will trigger NetworkOnMainThreadException – levi Sep 17 '14 at 20:41
@levi. I see what you are saying, but in terms of the question it was not relevant to point out. – ahodder Sep 17 '14 at 22:05
@levi I'm not sure I follow you. You want me to update the answer to include the fact that that exception may be thrown or make a note? Regardless, your comment will suffice to all future viewers. – ahodder Sep 17 '14 at 23:28
If i want to show a message (alertdialog,toast, etc.) how can i do it using this code? I tried it but i can only make it show the message when there's conection to the server, hope someone can tell me – Armando Jan 03 '18 at 06:48

score 3 · Answer 2 · answered Feb 07 '12 at 16:41

3

You can try

InetAddress.getByName(host).isReachable(timeOut)

answered Feb 07 '12 at 16:41

Oguz Ozkeroglu

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this method sometimes return false, even host available – famfamfam Feb 26 '19 at 07:04

Ferdiyan Syah · Answer 3 · 2013-10-07T08:35:01.100

Runtime runtime = Runtime.getRuntime();
            Process proc;
            try {
                proc = runtime.exec("ping -c 1"+ (String) getText(R.string.Server));
                proc.waitFor();
                int exit = proc.exitValue();
                if (exit == 0) { // normal exit


                } else { // abnormal exit, so decide that the server is not
                            // reachable


                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } // other servers, for example
            catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

Android: Check connection to server

3 Answers3

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