android编程4：多线程编程-优快云博客

本文博客链接:http://blog.youkuaiyun.com/jdh99,作者:jdh,转载请注明.

功能与编程3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。

环境：win7 + eclipse + ndk

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