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POAndroid: java.net.DatagramSocket.bind: Invalid Argument Exception
 

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  1. POAndroid: java.net.DatagramSocket.bind: Invalid Argument Exception
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    <p>Background: I'm writing a simple UDP application to ping a beta server I manage every minute or so to tell me it is still up and running (I can't enable ping on the server for those that are wondering). I plan to run this on my phone to warn me when the server is no longer responding.</p> <p>I'm trying to use the seemingly simple java.net.DatagramSocket as such:</p> <pre><code> try { socket = new DatagramSocket(); socket.bind(null); } catch (SocketException e) { System.out.println(e.toString()); throw e; } </code></pre> <p>Let me also say that I have enabled the Internet permissions through the android manifest and if I remove the uses clause to do so, I get a permissions error so I'm sure that is working OK. When I download this code to an Android Virtual Device (AVD) and execute it, on the call to bind() I am presented with this exception:</p> <p>03-17 19:07:39.401: INFO/System.out(338): java.net.BindException: Invalid argument</p> <p>According to <a href="http://developer.android.com/reference/java/net/DatagramSocket.html#bind%28java.net.SocketAddress%29" rel="noreferrer">this</a> documentation, the null argument is correct:</p> <blockquote> <p>public void bind (SocketAddress localAddr)</p> <p>Since: API Level 1</p> <p>Binds this socket to the local address and port specified by localAddr. <strong>If this value is null any free port on a valid local address is used</strong>.</p> </blockquote> <p>But not trusting documentation, I decided to enumerate the IP addresses on my device like this:</p> <pre><code> ArrayList&lt;NetworkInterface&gt; allInterfaces = Collections.list(NetworkInterface.getNetworkInterfaces()); NetworkInterface eth = allInterfaces.get(0); InetSocketAddress addr = new InetSocketAddress(eth.getInetAddresses().nextElement(), port); try { socket = new DatagramSocket(); socket.bind(addr); } catch (SocketException e) { System.out.println(e.toString()); throw e; } </code></pre> <p>When I step through the code, it works great and I can see the two IP address on the AVD but I get the exact same exception on the bind() call. Does anybody out there see what i might be missing? I will continue to research and hopefully post a solution to my own problem, but I am hoping somebody out there will be able to shortcut this for me.</p>
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    2. COtry with different port number.
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