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javaandroidsockets
Alex F
Alex F

Reputation: 43311

Socket timeout and cancellation

I have the following code running in AsyncTask:

    socket = new Socket(host, Integer.parseInt(port));

In the case when host name is correct, but there is no socket server listening on the port, this line may work several minutes before throwing exception. Can I set communication timeout? Also, is it possible to stop this process - currently it doesn't react to AsyncTask.cancel call.

Upvotes: 4

Views: 1389

Answers (3)

Sreekanth
Sreekanth

Reputation: 323

You can do this:

Socket soc = null;
while(soc == null){
    try{
        soc = new Socket("x.x.x.x", portNumber);
    }
    catch(Exception ex){
    }
}

Since:

socket.connect(remoteAddress, timeout)

Is notoriously unreliable, you could code your own version of timeout. The code I wrote, waits for a connection infinitely, but you can very easily introduce a timer.

Upvotes: 0

Matt Wolfe
Matt Wolfe

Reputation: 9284

Create the socket with the no parameters contructor like this:

socket = new Socket();

Then use

socket.connect(remoteAddress, timeout);

See http://developer.android.com/reference/java/net/Socket.html for more information.

-- Update --

I didn't notice originally that you asked about how to cancel the socket connection. While I'm not real familiar with socket programming it looks like you would do this:

  1. Call cancel on the asynctask as you seem to already have tried.
  2. Override/Implement onCancelled method for the async task. In the implementation, you will need to use your reference to the socket (make it a class instance variable), and call the close() method of the socket. Be sure to read up on closing a socket and make sure you're handling the exceptions for the input/output stream appropriately so your app doesn't crash. Checkout this question for more info on closing sockets.

Upvotes: 5

Arpit Patel
Arpit Patel

Reputation: 1571

You have to create a socket first and then use below method in it.

Socket client=new Socket();   
client.connect(new InetSocketAddress(hostip,port_num),connection_time_out);

Upvotes: 1

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