Question

我正在使用UDP服务器进行多人游戏，我不明白为什么我的服务器线程在其循环的第一次迭代后自行停止。以下是启动线程的Activity的代码：

public class GameActivity extends Activity {

public ServerUDP t;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
                            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(R.layout.activity_game);
    t = new ServerUDP();
    t.setRunning(true);
    t.start();
}

@Override
protected void onPause()
{
    super.onPause();
    t.setRunning(false);
    t.interrupt();
}


@Override
protected void onDestroy()
{
    super.onDestroy();
    t.setRunning(false);
    t.interrupt();

}
}

这是服务器代码：

 public class ServerUDP extends Thread 
 {
    private boolean mRun;

    private DatagramSocket serverSocket ;
    private byte[] receiveData;
    private byte[] sendData;
    private int ServerPort = 9000;

    ServerUDP()
    {
        try {
            if(serverSocket == null)
            {
                serverSocket = new DatagramSocket(null);
                serverSocket.setReuseAddress(true);
                serverSocket.bind(new InetSocketAddress(ServerPort));
                receiveData = new byte[1024];
                sendData = new byte[1024];
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run()
    {
        while (mRun) 
        {
            Log.v("socket","in loop");
            sendData = "test".getBytes();
            InetAddress local;
            try {
                local = InetAddress.getByName("10.0.2.2");
                Log.v("socket","Sent"+sendData);
                DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length,local, 8088);
                serverSocket.send(sendPacket);
            } catch (IOException e) {
                e.printStackTrace();
            }


            DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
            try {
                serverSocket.receive(receivePacket);
            String receiveString = new String( receivePacket.getData());
            Log.v("RECEIVED",receiveString); 
            } catch (IOException e1) {
                e1.printStackTrace();
            }
        }
    }
    public void setRunning(boolean b) 
    {
        mRun = b;
    }

}

问题是我只收到一条“循环”消息。我的线程似乎在一个循环后死亡。我检查了调试模式，它仍然存在，但它没有再次通过服务器循环。

任何想法为什么？

Answer 1

除了IOException（来自RuntimeException的未经检查的异常）之外，它可能会获得异常。尝试将run方法中的所有内容包装在try ... catch(Exception e)块中。

Answer 2

我猜你的线程在等待服务器响应的send()或receive()来电时都会阻塞。

在Android Activity中随机停止

2 个答案: