android编程之多线程编程实例分析_Android

android编程之多线程编程实例分析

2021-03-16 15:26jdh99 Android

这篇文章主要介绍了android编程之多线程编程,实例分析了Android多线程程序设计的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下

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《android开发socket编程之udp发送实例分析》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; 

									   } 

									  } 

									 } 

									}