android xml中onclick无效的原因

    public synchronized void sendUDP(View view) {
        scheduledThreadPool = Executors.newScheduledThreadPool(5);
        scheduledThreadPool.scheduleAtFixedRate(new Runnable() {
            public void run() {
                try {
                    byte[] buf = "hello".getBytes();
                    DatagramSocket datagramSocket2 = new DatagramSocket();
                    DatagramPacket datagramPacket2 = new DatagramPacket(buf, buf.length, InetAddress.getLocalHost(), 12345);
                    datagramSocket2.send(datagramPacket2);
                } catch (IOException e1) {
                    //TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }
        }, 1, 1, TimeUnit.SECONDS);
    }

如上两段代码，点击button时，函数并不响应。

原因是先前写了button的onclicklistener方法，注释掉即可。

//        button.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View view) {
//                //sendMessage();
//                //sendUDP("hello");
//            }
//        });