android开发socket编程之udp发送实例分析

本文实例讲述了android开发socket编程之udp发送实现方法。分享给大家供大家参考。具体分析如下：

需要实现的功能：采用udp下的socket编程，当按下确认键，模拟器发送文本框数据，pc机上的网络调试助手接收

一、环境：

win7 + eclipse + sdk

二、代码：

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;
 private static final int MAX_DATA_PACKET_LENGTH = 40;
 private byte[] buffer = new byte[MAX_DATA_PACKET_LENGTH];
 private DatagramPacket dataPacket;
 private DatagramSocket udpSocket;
 /** 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();
  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();
  } 

  press.setOnClickListener(new Button.OnClickListener()
  {
   @Override
   public void onClick(View v)
   {
    flag = true;
    /*
    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);
    */
    //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();
    }
   }
  });
 }
}

界面如下：

注意：在模拟器IP为本机IP，端口为模拟器名称

希望本文所述对大家的Android程序设计有所帮助。