java - 安卓利用Socket和PC通信无法连接？

问题描述

问 题

1. 安卓利用Socket和PC通信无法连接

2. 已经设置了 <uses-permission android:name="android.permission.INTERNET"/>

3. 相同代码PC端和PC端通信没有问题

4. 会在new Socket(ip,port)这里一直堵塞；
   

服务器代码

public ServiceThread(Socket s) throws IOException {
        socket = s;
        out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket
                .getOutputStream())), true);
        in=socket.getInputStream();
    }

    public void run() {
        try {
            out.println("SERVER DATA");
            System.out.println("closing...");
            byte[] temp = new byte[1024];
            int length=-1;
            while((length=in.read(temp))>0){
                System.out.println(temp);
            }
            out.close();
            socket.close();
        } catch (Exception e) {
        }
    }
}

public class MyServer {
    static final int PORT = 8778;

    public static void main(String[] args) throws IOException {
        ServerSocket s = new ServerSocket(PORT);
        System.out.println("Server 启动");
        Socket socket = s.accept();
        ServiceThread t = new ServiceThread(socket);
        t.start();
    }
}

客户端代码

Socket socket = null;
                BufferedWriter out = null;
                try {
                    socket = new Socket(ip, 8778);
                    out = new BufferedWriter(new OutputStreamWriter(socket
                            .getOutputStream()));
                    out.write(sendViewA.getText().toString());
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {

                Socket socket = null;
                BufferedReader in = null;
                try {
                    socket = new Socket(ip, 8778);
                    in = new BufferedReader(new InputStreamReader(socket
                            .getInputStream()));
                    String fromServerStr = in.readLine();
                    Toast.makeText(OUTActivity.this,fromServerStr,Toast.LENGTH_LONG).show();
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {

解决方案

看你的报错，你是不是让 Socket 跑在 UI 线程里面了？—— 安卓上的话，Android 4.0 之后，就不允许在 UI 线程中使用 Socket，需要启动新的线程来使用 Socket

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