如何在没有套接字的Android中使用TCP客户端？

Question

I have a TCP server in C# and also a TCP Client in C#, now I need a TCP Client in Android too.

All the examples i found are related to sockets, but I'm using a simple TCP Client so they don't work.

Right now my C# TCP Client is like that:

TcpClient client = new TcpClient("127.0.0.1", 1200);
        NetworkStream n = client.GetStream();
        Console.WriteLine("Insert name");
        string name= Console.ReadLine();
        byte[] message = Encoding.Unicode.GetBytes(name);
        n.Write(message, 0, message.Length);

Is there a corresponding of this function in Android?

This is the actual android client i'm trying and that doesn't work

InetAddress serverAddr = InetAddress.getByName("127.0.0.1");

        socket = new Socket(serverAddr, 1200);
        EditText et = (EditText) findViewById(R.id.EditText01);
        String str = et.getText().toString();
        PrintWriter out = new PrintWriter(new BufferedWriter(
                new OutputStreamWriter(socket.getOutputStream())),
                true);
        out.println(str);

Answer 1

First, this line:

InetAddress serverAddr = InetAddress.getByName(127.0.0.1);

contains a syntax error. It should be:

InetAddress serverAddr = InetAddress.getByName("127.0.0.1");

Second, the address "127.0.0.1" refers to the "same machine" that executes the client. In the case of your C# program, the server runs on the same machine as the client, so it worked. But in the case of Android, there in no server that runs on the "same machine", which is your Android phone (event if it is emulated, 127.0.0.1 refers to the emulated Android device, not the PC that it works on). You must specify a "good" address to the Android device that refers to the machine on which the server executes.

So, the problem is not in using sockets.

Answer 2

您可以简单地使用此线路连接到服务器，如果服务器在PC上运行，也可以尝试禁用防火墙。

Socket server= new Socket("192.168.1.1", 4444); // Enter your PC/Server IP address in place of 192.168.1.1