Connecting to a server using android and Java sockets with needed permission from user

Question

I want to connect to a server using java but the problem is that it seems nothing is working. I know this question has been asked a lot of time but non of them seem to provide a solution for this problem.

My server code:

//SERVER
ServerSocket serverSocket = new ServerSocket(1234);
Socket s1 = serverSocket.accept();
PrintStream ps = new PrintStream(s1.getOutputStream());
ps.println("text");

---

My client code:

//CLIENT
Socket s2 = new Socket("localhost", 1234);
BufferedReader br = new BufferedReader
        (new InputStreamReader(s2.getInputStream()));
String input = br.readLine();

---

I have added the permission tag in the android manifest:

<uses-permission android:name="android.permission.INTERNET"/>

What am I doing wrong. I'm not new to Java Sockets but I am new to the world of android. Do I need to run my network code in a seperate thread or what else solves my problem?

Thanks in advance

**EDIT:**I have checked the logs and console and no exception have been caught.

Answer 1

if you're not getting any exception on the android client this means that you're not actually opening the socket, if you do open it on the UI thread you get a NetworkOnMainThreadException . so i suspect that piece of code you posted is not being executed at all.

regarding how to do it on android it depends, if it's a short operation you can use an AsyncTask . keep in mind that one AsyncTask does not equals one Thread , they get queued up. if you need to keep the connection alive you can use a Thread. check out this example for AsyncTask and this other one for Thread. they use DatagramSocket but the idea it's the same