StackOverflow中提到的讨论 - 对我没有帮助
我试图让客户端在Android模拟器上运行，连接到我在同一台机器上运行的服务器上的服务器。 服务器配置为侦听端口5000。 服务器似乎不是问题所在。当我在eclipse上运行客户端时，他们可以打开一个套接字并进行通信。 当我尝试在Android模拟器上运行Client类时，mainActivity会告诉客户端在创建它时进行连接。 但是由于某种原因，dbugging流程到达catch块，而不是创建套接字。
我也尝试使用client.connect("10.0.2.2",5000);，但它没有帮助。
MainActivity.java
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Client client = new Client(this);
try {
client.connect("192.168.1.10",5000);
} catch (IOException e) {
e.printStackTrace();
}
}
Client.java
package com.example.oshri.p;
import java.net.Socket;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Observable;
public class Client extends Observable implements Runnable {
MainActivity creatingActivity; // the activity that creates Client
private Socket socket;
private BufferedReader br;
private PrintWriter pw;
private boolean connected;
private int port=5555; //default port
private String hostName="localhost";//default host name
public Client(MainActivity activity) {
connected = false;
this.creatingActivity = activity;
}
public void connect(String hostName, int port) throws IOException {
if(!connected)
{
this.hostName = hostName;
this.port = port;
socket = new Socket(hostName,port);
//get I/O from socket
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
pw = new PrintWriter(socket.getOutputStream(),true);
connected = true;
//initiate reading from server...
Thread t = new Thread(this);
t.start(); //will call run method of this class
}
}
public void sendMessage(String msg) throws IOException
{
if(connected) {
pw.println(msg);
} else throw new IOException("Not connected to server");
}
public void disconnect() {
if(socket != null && connected)
{
try {
socket.close();
}catch(IOException ioe) {
//unable to close, nothing to do...
}
finally {
this.connected = false;
}
}
}
public void run() {
String msg = ""; //holds the msg recieved from server
try {
while(connected && (msg = br.readLine())!= null)
{
creatingActivity.displayServerAnswer("Server:"+msg);
this.setChanged();
this.notifyObservers(msg);
}
}
catch(IOException ioe) { }
finally { connected = false; }
}
public boolean isConnected() {
return connected;
}
public int getPort(){
return port;
}
public void setPort(int port){
this.port = port;
}
public String getHostName(){
return hostName;
}
public void setHostName(String hostName){
this.hostName = hostName;
}
}
答案 0 :(得分：0)
@greenapps指出了这个问题： 套接字是在主要活动中创建的。
@Squonk指出了问题，IP应该是10.0.2.2 - 模拟器中用于连接到模拟器运行的机器的本地主机的转换地址代码已编辑：
MainActivity.java
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ClientThread clientThread = new ClientThread(this);
try {
clientThread.startClientThread("10.0.2.2",5000);
} catch (IOException e) {
e.printStackTrace();
}
}
ClientThread.java
package com.example.oshri.parkit;
import java.net.Socket;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Observable;
public class ClientThread extends Observable implements Runnable {
MainActivity creatingActivity; // the activity that creates ClientThread
private Socket socket; //Uses to connect to the server
private BufferedReader br; //For reading input from server.
private PrintWriter pw; //For writing output to server.
private boolean connected; //Status of client.
private int port=5555; //default port
private String hostName="localhost";//default host name
public ClientThread(MainActivity activity) {
connected = false;
this.creatingActivity = activity;
}
public void startClientThread(String hostName, int port) throws IOException {
if(!connected)
{
this.hostName = hostName;
this.port = port;
Thread t = new Thread(this);
t.start(); //will call run method of this class, that first thing will create a client socket(cannot create socket in main thread)
}
}
public void sendMessage(String msg) throws IOException
{
if(connected) {
pw.println(msg);
} else throw new IOException("Not connected to server");
}
public void disconnect() {
if(socket != null && connected)
{
try {
socket.close();
}catch(IOException ioe) {
//unable to close, nothing to do...
}
finally {
this.connected = false;
}
}
}
private void connect(){
// create socket to connect the server
try {
socket = new Socket(hostName, port);
}
catch(SocketException e){
System.out.println("client socket could not be created");
}
catch (UnknownHostException e){
System.out.println("UnknownHostException");
}
catch (IOException e){
System.out.println("IOException");
}
// create buffers for socket IO
try{
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
pw = new PrintWriter(socket.getOutputStream(),true);
}
catch (IOException e){
System.out.println("socket buffers could not be created");
}
connected = true;
}
public void run() {
connect(); //connects the server
String msg = ""; //holds the msg recieved from server
try {
while(connected && (msg = br.readLine())!= null)
{
//System.out.println("Server:"+msg);
creatingActivity.displayServerAnswer("Server:"+msg);
//notify observers//
this.setChanged();
//notify+send out recieved msg to Observers
this.notifyObservers(msg);
}
}
catch(IOException ioe) { }
finally { connected = false; }
}
public boolean isConnected() {
return connected;
}
public int getPort(){
return port;
}
public void setPort(int port){
this.port = port;
}
public String getHostName(){
return hostName;
}
public void setHostName(String hostName){
this.hostName = hostName;
}
}