尽管使用了睡眠，但计时错误

Question

我在一个IOIO Android开发板上工作。我正在试着控制两个引脚和一个发光二极管，并且每隔一段时间就把它们打开。到目前为止，它连接得很好，发光二极管和引脚都是开着和关着的，但时机不对。我认为问题出在sleep()函数上。任何帮助或指导都将不胜感激。

                 class IOIOThread extends Thread {
        private IOIO ioio_;
        private boolean abort_ = false;


        @Override
        public void run() {
            super.run();
            while (true) {
                synchronized (this) {
                    if (abort_) {
                        break;
                    }
                    ioio_ = IOIOFactory.create();
                }
                try {
                    setText(R.string.wait_ioio);
                    ioio_.waitForConnect();
                    setText(R.string.ioio_connected);

                    while (true) {

                        while((button_.isChecked())==true){

                            DigitalOutput led = ioio_.openDigitalOutput(0,   false);;
                            DigitalOutput S1 = ioio_.openDigitalOutput(35,   false);
                            DigitalOutput S2 = ioio_.openDigitalOutput(36,  false);
                            DigitalOutput S3 = ioio_.openDigitalOutput(37,   false);
                            DigitalOutput S4 = ioio_.openDigitalOutput(38,   false);

                            holdTime=30000;

                            for (currentTime=0; currentTime<=holdTime;)
                            {
                                led.write(true);
                                S1.write(true);
                                S2.write(true);
                                sleep(4000);
                                led.write(false);
                                S1.write(false);
                                S2.write(false);
                                sleep(2000);
                                led.write(true);
                                S3.write(true);
                                S4.write(true);
                                sleep(4000);
                                led.write(false);
                                S3.write(false);
                                S4.write(false);
                                sleep(4000);
                                currentTime = currentTime+14000;

                        }}}}

                catch (ConnectionLostException e) {
                } catch (Exception e) {
                    Log.e("HelloIOIOPower", "Unexpected exception caught", e);
                    ioio_.disconnect();
                    break;
                } finally {
                    try {
                        ioio_.waitForDisconnect();
                    } catch (InterruptedException e) {
                    }
                }
            }
        }

Answer 1

Sleep()并不是实时的--它只会让你的线程保持至少指定的毫秒数。在此之后，它可用于调度，并将在某个时候执行。