Java 套接字=新套接字（serverAddr，端口）；

当我说socket=newsocket（serverAddr，PORT）时；在android中，打开的是哪种类型的套接字？UDP套接字还是TCP套接字？

我正在尝试从我的android发送数据，并从我的PC读取数据。我正在从UDP接收器C#script（Unity3D）读取数据。但我的android报告连接超时异常

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我的问题是，android打开的是什么类型的套接字？

您使用的是tcp。对于使用udp套接字，请使用以下示例代码：

服务器代码：

public class udp_server
{
public static void main(String args[])
{
    DatagramSocket sock = null;

    try
    {
        //1. creating a server socket, parameter is local port number
        sock = new DatagramSocket(7777);

        //buffer to receive incoming data
        byte[] buffer = new byte[65536];
        DatagramPacket incoming = new DatagramPacket(buffer, buffer.length);

        //2. Wait for an incoming data
        echo("Server socket created. Waiting for incoming data...");

        //communication loop
        while(true)
        {
            sock.receive(incoming);
            byte[] data = incoming.getData();
            String s = new String(data, 0, incoming.getLength());

            //echo the details of incoming data - client ip : client port - client message
            echo(incoming.getAddress().getHostAddress() + " : " + incoming.getPort() + " - " + s);

            s = "OK : " + s;
            DatagramPacket dp = new DatagramPacket(s.getBytes() , s.getBytes().length , incoming.getAddress() , incoming.getPort());
            sock.send(dp);
        }
    }

    catch(IOException e)
    {
        System.err.println("IOException " + e);
    }
}

//simple function to echo data to terminal
public static void echo(String msg)
{
    System.out.println(msg);
}
}

客户端代码：

public class udp_client
{
public static void main(String args[])
{
    DatagramSocket sock = null;
    int port = 7777;
    String s;

    BufferedReader cin = new BufferedReader(new   InputStreamReader(System.in));

    try
    {
        sock = new DatagramSocket();

        InetAddress host = InetAddress.getByName("localhost");

        while(true)
        {
            //take input and send the packet
            echo("Enter message to send : ");
            s = (String)cin.readLine();
            byte[] b = s.getBytes();

            DatagramPacket  dp = new DatagramPacket(b , b.length , host , port);
            sock.send(dp);

            //now receive reply
            //buffer to receive incoming data
            byte[] buffer = new byte[65536];
            DatagramPacket reply = new DatagramPacket(buffer, buffer.length);
            sock.receive(reply);

            byte[] data = reply.getData();
            s = new String(data, 0, reply.getLength());

            //echo the details of incoming data - client ip : client port -     client message
            echo(reply.getAddress().getHostAddress() + " : " +         reply.getPort() + " - " + s);
        }
    }

    catch(IOException e)
    {
        System.err.println("IOException " + e);
    }
}

//simple function to echo data to terminal
public static void echo(String msg)
{
    System.out.println(msg);
}
}

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Socket.connect

打开TCP套接字以使用UDP，您需要创建一个

DatagramSocket

谢谢，这很有帮助。我试着从电脑上实时读取手机上的加速计数据。我打开了一个tcp连接，通过WiFi获取数据流。但也有一些滞后。有什么更好的方法可以做到这一点？wifi是正确的方法，还是我应该试试蓝牙？最终，我的手机应该像无线鼠标一样传输数据。