Android套接字等待问题

Question

Hello I have an app that connect to a remote server using sockets

socket = new Socket();
socket.connect(new InetSocketAddress(Ip, portNum), 7000);

I have 2 methods send & receive

the scenario in send is

 PrintWriter out = new PrintWriter(socket.getOutputStream(),true);

in method receive

  String msg = "";
    BufferedReader in = null;

    try {
        in = new BufferedReader(new InputStreamReader(socket.getInputStream()));


        while (in.ready()) {

            msg = msg + (char) in.read();

        }
        socket.close();

    } catch (IOException e) {
        e.printStackTrace();
    }

in AsyncTask of a different class I call

 send();
 String response=receive();

The above code is not sending or receiving without a wait period

ie

    Thread.sleep(2000);

I know sleep is a bad approach what is the best scenario should I use?

Is it better to make an AsyncTask within send method and another one for receive method.

Here is where I use sleep and what data send & receive

 client.send(some sql statement representED as json format);
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
// sql select result represented as json
        String RESULT = client.recive();

Answer 1

Likely your server is not listening before you try to connect. Though this is unclear from the code you have posted. You'll need to show both server and client code there.