TCP客户端没有在Android上工作 [英] TCP Client don't work on Android

问题描述

我做在Java客户端，并在Eclipse IDE的一些测试和完美的工作，在本地主机上，外部服务器，等等。
当我出口code到Android，这是行不通的，服务器没有收到什么...

I make a client in Java, and make some test on Eclipse IDE and work perfectly, on localhost, external server, etc. When I export the code to android, it doesn't work, the server don't receive nothing ...

类code：

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;

/**
 * Jose Manuel R---- ----
 * Java version 2.0
 */
public class ClienteTCP {

private CharSequence TCP_HOST = "localhost";
private int TCP_PORT = 5000;

volatile private CharSequence SSID, PASS, SERVER_IP;
volatile private int SERVER_PORT;

final private String START = "START";

// Constructor vacio
public ClienteTCP( ) {

}

// Constructor con argumentos
public ClienteTCP(CharSequence tcp_host, int tcp_port, CharSequence ssid, CharSequence pass, CharSequence ip, int port) {
    this.TCP_HOST = tcp_host;
    this.TCP_PORT = tcp_port;
    this.SSID = ssid;
    this.PASS = pass;
    this.SERVER_PORT = port;
    this.SERVER_IP = ip;
}

// CONF METHODS

public void setServerTCPConf(CharSequence host, int port) {
    setTCP_HOST(host);
    setTCP_PORT(port);
}

public void setApConf(CharSequence ssid, CharSequence pass) {
    setSSID(ssid);
    setPASS(pass);
}

public void setServerConf(CharSequence ip, int port) {
    setSERVER_IP(ip);
    setSERVER_PORT(port);
}

// PUBLIC METHODS

public String configureMC() {

    sendMessage( createMessage("AP="+SSID.toString()+","+PASS.toString().toString()) );
    sendMessage( createMessage("SERVER="+SERVER_IP.toString()+","+SERVER_PORT) );

    return sendMessage( createMessage(START) );
}

public String sendMessage(String msg) {

    String msgRec = null;
    Socket s;

    try {
        s = new Socket(TCP_HOST.toString(), TCP_PORT);

        BufferedReader reader = new BufferedReader(new InputStreamReader(s.getInputStream()));
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));

        writer.write(msg, 0, msg.length());
        writer.flush();

        msgRec = reader.readLine();

        reader.close();
        writer.close();
        s.close();

    } catch (IOException e) {
        android.util.Log.d("log", e.getMessage());
        // e.printStackTrace();
    }

    return msgRec;
}

// PRIVATE METHODS

private String createMessage(String msg) {

    char _AF = ((char)175);
    char _FA = (char)250;

    return (_AF+msg+_FA);
}

}

MainActivity：

MainActivity:

/*

Jose Manuel adad adsasd
TCP client for Android
v1.2-alpha

 */

import android.os.StrictMode;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import java.net.Socket;

public class MainActivity extends ActionBarActivity {

private volatile EditText debugText;

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

    StrictMode.ThreadPolicy policy = new   StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);

    Button button = (Button) findViewById(R.id.SEND);
    EditText ssid = (EditText) findViewById(R.id.textSsid);
    EditText pass = (EditText) findViewById(R.id.textPass);
    debugText = (EditText) findViewById(R.id.debugText);
    debugText.setText("Version 1-alpha");

    button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            // Do something in response to button click
            demo();
        }
    });
}

@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);
}

private void demo() {

    ClienteTCP cliente = new ClienteTCP();

    CharSequence cs = cliente.sendMessage("Hola Mundo");

    if ( cs != null)
        debugText.setText(cs);
    else
        debugText.setText("ERROR OCURRED");
}
}

我很抱歉，由于大code，但我快要哭了：/////

I'm sorry due to big code, but I'm going to cry ://///

推荐答案

如果你试图连接到本地主机，从Android设备，它将尝试连接到服务的Andr​​oid设备上，因为，在任何设备你是运行，这是本地主机。

If you try to connect to "localhost" from the Android device, it will try to connect to a service on the Android device because, on whatever device you are running, that is the "local host".

由于服务是您的机器上运行，它需要通过由在Android设备连接到的IP地址被引用。这意味着，如果手机/平板电脑/无论是连接到本地无线网络，任何192.168。*。*（私人网络）地址应连接得很好，但如果是在公共互联网上（通过蜂窝网络，例如），那么它会要求的公共的IP你的机器或其他设备的地址，如防火墙，这将端口转发到您的计算机内部网络上。

Since the service is running on your machine, it needs to be referenced via an IP address that is reachable by the Android device. That means that if the phone/tablet/whatever is connected to your local WiFi, any 192.168.*.* (private network) address should connect just fine but if it's on the public Internet (via a cellular network, for example) then it'll require the public IP address of your machine or of another device, such as a firewall, that will forward the port to your machine on your internal network.

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