Question

This is the first time i’m asking a question here at stack overflow so bear with me.
I’ll try to keep this brief.

I’m writing a simple client socket android application.
The server I’m connecting to has a chat robot named Alice.
I have managed to connect to the server and I receive the message “Hello from alice” but then the thread seems to stop because I’m not receiving any more messages.

Here is some code:

    @Override
public void run() {

    try 
    {
        while (true)
        {
        String _input = _rd.readLine();
        if (_input != null)
        {
        _field.append("Alice : "+ _input+"\n");
        }
        else
        {
            _field.append("null");
        }
            sleep(50);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
     catch (InterruptedException e) {
        e.printStackTrace();
    }
}

As you can see I have attempted to troubleshoot my code by appending “null” even if I don’t receive a message, however this is neither shown in my EditText.

I call .start() from my main Activity class when the user presses a button.

        @Override
        public void onClick(View arg0) {

            setContentView(R.layout.second);
            InitiateSecondFrame();  

            _cs = new ClientSocket();
            String _check = _cs.EstablishConnection(_host.getText().toString(),
                    Integer.parseInt(_port.getText().toString()),
                    (EditText)findViewById(R.id.historyField));

            _cs.start();

            Toast.makeText(getApplicationContext(), _check, 100).show();
            SaveHostPort(_host.getText().toString(), _port.getText().toString());                           
        }
    }); 

The ClientSocket class is extended by Thread and implements Runnable, I’ve also tried just extending or implementing.
I do not get any error message at all.
I hope the information I have given is enough for you to realize what’s wrong.
Remember I’m new at multithreading and sockets so I might have missed something fundamental.

Answer 1

_rd.readLine();

is your problem here. It will block and wait forever for input from the remote system, and will only return the content received when it detects a newline character from the remote system.