android Socket实现简单聊天小程序

android socket实现简单聊天小程序，供大家参考，具体内容如下

服务器端：

package org.hwq.echo; 
 
import java.io.bufferedreader; 
import java.io.ioexception; 
import java.io.inputstreamreader; 
import java.io.printwriter; 
import java.net.serversocket; 
import java.net.socket; 
 
public class talkserver { 
  public static void main(string[] args) throws ioexception{ 
    serversocket server = null; 
    socket client = null; 
    bufferedreader in = null; 
    printwriter out = null; 
    try{ 
      server = new serversocket(4700); 
      client = server.accept(); 
      out = new printwriter(client.getoutputstream()); 
      in = new bufferedreader(new inputstreamreader(client.getinputstream())); 
      string line = in.readline(); 
      while(!"bye".equals(line)){ 
        system.out.println("client:"+line); 
        out.println("echo:"+line); 
        out.flush(); 
        line = in.readline(); 
      } 
    }catch (exception e) { 
      e.printstacktrace(); 
      if(client !=null) 
        client.close(); 
      if(server != null) 
        server.close(); 
    } 
  } 
} 

手机端：

package org.hwq.cho; 
 
import java.io.bufferedreader; 
import java.io.ioexception; 
import java.io.inputstreamreader; 
import java.io.printwriter; 
import java.net.socket; 
import java.net.unknownhostexception; 
 
import android.app.activity; 
import android.content.context; 
import android.os.bundle; 
import android.os.handler; 
import android.os.message; 
import android.view.view; 
import android.view.view.onclicklistener; 
import android.widget.button; 
import android.widget.edittext; 
import android.widget.toast; 
 
public class echoactivity extends activity implements onclicklistener { 
  edittext show,msg; 
  button send; 
  handler handler; 
  socket client; 
  /** called when the activity is first created. */ 
  @override 
  public void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.main); 
    handler = new myhandler(); 
    show = (edittext) findviewbyid(r.id.show); 
    msg = (edittext) findviewbyid(r.id.msg); 
    send = (button) findviewbyid(r.id.send); 
    send.setonclicklistener(this); 
  } 
  @override 
  public void onclick(view arg0) { 
    string message = msg.gettext().tostring(); 
//   system.out.println("msg:"+message); 
    new echothread(echoactivity.this,message).start(); 
  } 
  public class myhandler extends handler{ 
    @override 
    public void handlemessage(message msg) { 
      switch(msg.what){ 
      case 1: 
        toast.maketext(echoactivity.this, "建立连接失败", 0).show(); 
        break; 
      case 2: 
        string message = (string) msg.obj; 
        system.out.println("handler:"+message); 
        show.append("\n"+message); 
        break; 
      } 
    } 
  } 
  private class echothread extends thread{ 
    private context context; 
    private string msg; 
    echothread(context context,string msg){ 
      this.context = context; 
      this.msg = msg; 
    } 
    public void run(){ 
      if(client == null){ 
        try { 
          client = new socket("192.168.1.102",4700); 
        } catch (ioexception e) { 
          message message = new message(); 
          message.what = 1; 
          handler.sendmessage(message); 
        } 
      } 
      system.out.println("建立连接"); 
      try{ 
        bufferedreader in; 
        bufferedreader input; 
        printwriter out; 
        in = new bufferedreader(new inputstreamreader(client.getinputstream())); 
        out = new printwriter(client.getoutputstream()); 
        string line = msg; 
        if(!"bye".equals(line)){ 
          system.out.println("line:"+line); 
          out.println(line); 
          out.flush(); 
          string echo = in.readline(); 
          system.out.println("server:"+echo); 
          message message = new message(); 
          message.obj = echo; 
          message.what = 2; 
          handler.sendmessage(message); 
        } 
      }catch (exception e) { 
         
      } 
    } 
  } 
} 

注意几点：

1、添加网络权限

<uses-permission android:name="android.permission.internet"/> 

如果没添加，无法使用socket连接网络。
2、在新启线程中不要使用android系统ui界面
在echothrad的run()方法里面，有下面代码：

if(client == null){ 
        try { 
          client = new socket("192.168.1.102",4700); 
        } catch (ioexception e) { 
          message message = new message(); 
          message.what = 1; 
          handler.sendmessage(message); 
        } 
      } 

这里的handler.sendmessage(message);是发送一个消息给handler,然后handler根据消息弹出一个toast显示连接失败。如果这里直接使用

toast.maketext(echoactivity.this, "建立连接失败", 0).show(); 

会报如下错：

can't create handler inside thread that has not called looper.prepare() 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。