1

我是 Android 编程新手，我编写了一个简单的服务器（VB.NET）/客户端（Java/Android）程序。来自 Android/Java 的文本已成功发送到 VB.Net，但在 Android/Java 中未收到来自 VB.Net 的响应（buffer.readLine() 返回 null）

我错过了什么吗？

这是我的代码

VB.NET（服务器）

Imports System.Net.Sockets
Imports System.Text

Public Class Form1

Dim server As New TcpListener(9999)
Dim client As New TcpClient
Dim stream As NetworkStream

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

End Sub

Private Sub Start_Click(sender As Object, e As EventArgs) Handles Start.Click
    Me.Text = "Waiting...."
    Dim str As String
    server.Start()
    client = server.AcceptTcpClient
    stream = client.GetStream()
    Dim r_byt(client.ReceiveBufferSize) As Byte
    stream.Read(r_byt, 0, client.ReceiveBufferSize)
    Str = Encoding.ASCII.GetString(r_byt)
    Label1.Text = str
End Sub

Private Sub Responce_Click(sender As Object, e As EventArgs) Handles Responce.Click
    Dim s_byt() As Byte = Encoding.ASCII.GetBytes("Got it" & vbCr)
    stream.Write(s_byt, 0, s_byt.Length)
    stream.Flush()
    stream.Close()
    client.Close()
    server.Stop()
End Sub

Android/Java(客户端)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class Main extends Activity {

Button buttonSend, buttonReceive;
private static Socket socket = null;
PrintStream stream = null;
BufferedReader buffer = null;
String string = "a";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    buttonSend = (Button) findViewById(R.id.buttonSend);
    buttonSend.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            try {
                socket = new Socket("192.168.0.104", 9999);
                stream = new PrintStream(socket.getOutputStream());
                stream.println("Hi Server...");

                buffer = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                string = buffer.readLine(); 
                Log.d("ServerActivity", " - " + string);
                buffer.close();
                socket.close();
            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    });

    }
}
4

1 回答 1

1

看起来你有几个问题：

  • 在服务器端，您正在尝试从套接字读取某些内容到 中r_byt，并且您没有在客户端写入任何内容。当您按下服务器端的发送按钮时，r_byt仍然为空，这就是您在客户端收到的内容。

  • 在客户端，对套接字读取的调用被阻塞，几秒钟后将导致客户端出现 ANR 错误（应用程序无响应）。您应该将套接字读取移动到与 UI 不同的线程。较新的 Android 版本甚至不允许您从 UI 线程中的套接字读取。

问候。

于 2013-01-01T01:35:36.507 回答