gistfile1.java

public class Server extends Thread {

    private final String LOG_TAG = "Server";

    private final int DEFAULT_PORT = 57646;
    private ServerSocket serverSocket = null;

    @Override
    public void run() {
        super.run();

        Socket socket = null;
		
        try {
            serverSocket = new ServerSocket(DEFAULT_PORT);
        } catch (IOException e) {
            e.printStackTrace();
            return;
        }

        while (!isInterrupted()) {
            try {
                socket = serverSocket.accept();
            } catch (IOException e) {
                Log.e(LOG_TAG, "I/O error: " + e);
            }
            if(socket != null)
                new ServerEcho(socket).start();
        }

        try {
             serverSocket.close();
        } catch (IOException e) {
             e.printStackTrace();
        }
    }
	
	 public void terminate(){
        interrupt();
        if(serverSocket != null){
		//Иначе получим android.os.NetworkOnMainThreadException
           new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                            serverSocket.close();
                     } catch (IOException e) {
                            e.printStackTrace();
                     }
                 }
              }).start();
        }
        try {
            join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}