android編程之多線程編程實例分析

本文實例講述了android編程之多線程編程實現方法。分享給大家供大家參考。具體分析如下：

該功能與前面《android開發socket編程之udp發送實例分析》中一樣，當按下鍵後，發送文本框中數據給PC。不同的是把發送數據的功能放在一個線程socket_send中。

一、環境：

win7 + eclipse + ndk

二、代碼：

主類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); 
  //開辟控件空間 
  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; 
   } 
  }); 
 } 
}

線程類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"; //這是要傳輸的數據 
  byte out [] = str.getBytes(); //把傳輸內容分解成字節 
  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) 
   { 
    //獲得輸入框文本 
    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：程序中采用的線程間通信的方法是把需要共享的變量設置成public屬性

希望本文所述對大家的Android程序設計有所幫助。