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android编程之多线程编程实例分析

2015-04-21 10:46 816 查看

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;
}
}
}
}

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。

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标签： android 多线程

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