PC端和安卓手机端通讯程序(UDP方式)

package S.D; /** * * by lili * 2016-09-20 * */ import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.widget.EditText; import android.widget.TextView; public class AndUDPActivity extends Activity { /** Called when the activity is first created. */ EditText et ; TextView tv; DatagramSocket ds; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); et = (EditText) findViewById(R.id.et); tv = (TextView) findViewById(R.id.tv); et.setText(""); tv.setText(""); try { //套接字 ds = new DatagramSocket(); new Thread(networkTask1).start(); } catch (IOException e) { e.printStackTrace(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add("发送"); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { if(item.getItemId()==0){ new Thread(networkTask).start(); } return super.onOptionsItemSelected(item); } /** * 子线程 发送 */ Runnable networkTask = new Runnable() { @Override public void run() { /// ********************* 手机---> 电脑 *********************// try { //发送内容 String str = et.getText().toString(); //构建数据报（内容+地址） DatagramPacket dp = new DatagramPacket(str.getBytes(), str.length(), InetAddress.getByName("222.210.157.43"), 5050); //把数据报发送出去 ds.send(dp); //关闭套接字 //ds.close(); Message msg = new Message(); Bundle data = new Bundle(); data.putString("value", "手机已发送：" + str); msg.setData(data); handler.sendMessage(msg); } catch (IOException e) { e.printStackTrace(); } } }; Handler handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); Bundle data = msg.getData(); String val = data.getString("value"); Log.i("LogTest", "结果为-->" + val); tv.setText( tv.getText() + "\n" + val); } }; /** * 接收数据 */ Runnable networkTask1 = new Runnable() { public void run() { try { /// ********************* 电脑---> 手机 *********************// //2、创建数据包，用于接收内容。 byte[] buf = new byte[1024]; DatagramPacket packet = new DatagramPacket(buf, buf.length); while (true) { ds.receive(packet); //关闭套接字 //ds.close(); Message msg = new Message(); Bundle data = new Bundle(); data.putString("value", "手机接收到：" + new String(packet.getData(), 0, packet.getLength())); msg.setData(data); handler.sendMessage(msg); } } catch (IOException e) { e.printStackTrace(); } } }; }