android编程之多线程编程实例分析

本文实例讲述了android编程之多线程编程实现方法。分享给大家供大家参考。具体分析如下：

该功能与前面《》中一样，当按下键后，发送文本框中数据给pc。不同的是把发送数据的功能放在一个线程socket_send中。

一、环境：

win7 + eclipse + ndk

二、代码：

主类test_socket.java

package test.soket; 
//import com.test_button.r; 
import java.io.dataoutputstream; 
import java.io.ioexception; 
import java.net.datagrampacket; 
import java.net.datagramsocket; 
import java.net.inetaddress; 
import java.net.socket; 
import java.net.socketexception; 
import java.net.unknownhostexception; 
import android.app.activity; 
import android.os.bundle; 
import android.view.view; 
import android.widget.button; 
import android.widget.textview; 
public class test_socket extends activity { 
 public static textview show; 
 public static button press; 
 public static boolean flag; 
 /** called when the activity is first created. */ 
 @override 
 public void oncreate(bundle savedinstancestate) { 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.main); 
  //开辟控件空间 
  show = (textview)findviewbyid(r.id.edittext1); 
  press = (button)findviewbyid(r.id.button1); 
  flag = false; 
  soket_send thread = new soket_send(); 
  thread.init(); 
  thread.start(); 
  press.setonclicklistener(new button.onclicklistener() 
  { 
   @override 
   public void onclick(view v) 
   { 
    flag = true; 
   } 
  }); 
 } 
}

线程类socke_sendt.java:

package test.soket; 
import java.io.dataoutputstream; 
import java.io.ioexception; 
import java.net.datagrampacket; 
import java.net.datagramsocket; 
import java.net.inetaddress; 
import java.net.socket; 
import java.net.socketexception; 
import java.net.unknownhostexception; 
import java.util.linkedlist; 
import android.media.audioformat; 
import android.media.audiorecord; 
import android.media.mediarecorder; 
import android.util.log;  
public class soket_send extends thread 
{ 
 private static final int max_data_packet_length = 40; 
 private byte[] buffer = new byte[max_data_packet_length]; 
 private datagrampacket datapacket; 
 private datagramsocket udpsocket; 
 public void init() 
 { 
  try 
  { 
   udpsocket = new datagramsocket(5554); 
  } 
  catch (socketexception e) 
  { 
   // todo auto-generated catch block 
   e.printstacktrace(); 
  } 
  datapacket = new datagrampacket(buffer, max_data_packet_length); 
  string str = "hello,jdh"; //这是要传输的数据 
  byte out [] = str.getbytes(); //把传输内容分解成字节 
  datapacket.setdata(out); 
  datapacket.setlength(out.length); 
  datapacket.setport(5554); 
  try 
  { 
   inetaddress broadcastaddr = inetaddress.getbyname("192.168.0.248"); 
   datapacket.setaddress(broadcastaddr); 
   udpsocket.send(datapacket); 
  } 
  catch (ioexception e) 
  { 
   // todo auto-generated catch block 
   e.printstacktrace(); 
  }  
 } 
 public void run() 
 { 
  while (true) 
  { 
   if (test_socket.flag) 
   { 
    //获得输入框文本 
    charsequence str =test_socket.show.gettext(); 
    byte out[] = str.tostring().getbytes(); 
    datapacket.setdata(out); 
    datapacket.setlength(out.length); 
    try 
    { 
       
     inetaddress broadcastaddr = inetaddress.getbyname("192.168.0.248"); 
     datapacket.setaddress(broadcastaddr); 
     udpsocket.send(datapacket); 
    } 
    catch (ioexception e) 
    { 
     // todo auto-generated catch block 
     e.printstacktrace(); 
    } 
    test_socket.flag = false; 
   } 
  } 
 } 
}

注意：程序中采用的线程间通信的方法是把需要共享的变量设置成public属性

希望本文所述对大家的android程序设计有所帮助。