Question

我已建立客户端服务器连接并且连接良好但套接字始终返回null，我不知道原因。

服务器是 MATLAB ，没有问题，运行良好。当我尝试在浏览器中编写服务器的ip时，它会向我提供客户端应该收到的消息。

这是服务器代码

data = 'Hello World..\n'
tcpipServer = tcpip('0.0.0.0',80,'NetworkRole','Server');
set(tcpipServer,'OutputBufferSize',length(data)+1);
fopen(tcpipServer);
fwrite(tcpipServer,data);
fclose(tcpipServer);

这是客户端代码

import android.os.AsyncTask;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;


public class MainActivity extends ActionBarActivity {
    Socket socket;
    TextView txt1;

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

        txt1 = (TextView) findViewById(R.id.txt1);


       final  byte[] data = new byte[1024];

new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            InetAddress serverAddr = InetAddress.getByName("192.168.185.10");

            socket = new Socket(serverAddr, 80);



            socket.getInputStream().read(data);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}).start();

        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }


        txt1.setText(new String(data));

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

以下是套接字始终等于null的问题

socket = new Socket(serverAddr, 80);

注意：它连接到服务器但没有收到任何东西我甚至在清单上有互联网许可。

Android客户端套接字始终为null

0 个答案: