人体感应代码逻辑

 需求：

人靠近马上灯亮，人离开等待5s后灯灭，使用Theard和Hander

 private boolean isTurnONLed = false; //标志位，是否打开开关

    @Override
    public void onCreate() {
        super.onCreate();
		startDetectionTP();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    private void startDetectionTP(){
    Log.i(TAG, "startDetectionTP.....................");
                Handler mHandler=new Handler(){
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                    case 1:    //灯灭
                             Log.d(TAG,"------------Extinguish-------------------------------1");
                             isTurnONLed = false;
                         setNodeString("/sys/class/gpio/gpio1248/value","0");
                         setNodeString("/sys/class/gpio/gpio1249/value","0");
                         setNodeString("/sys/class/gpio/gpio1250/value","0");
                         setNodeString("/sys/class/gpio/gpio1251/value","0");
                         setNodeString("/sys/class/gpio/gpio1255/value","0");
                         setNodeString("/sys/class/gpio/gpio1229/value","0");
                         break;
                    case 2:    //灯亮
                    isTurnONLed = true;
                                Log.d(TAG,"-----------------light--------------------------2");
                            setNodeString("/sys/class/gpio/gpio1248/value","1");
                            setNodeString("/sys/class/gpio/gpio1249/value","1");
                            setNodeString("/sys/class/gpio/gpio1250/value","1");
                            setNodeString("/sys/class/gpio/gpio1251/value","1");
                            setNodeString("/sys/class/gpio/gpio1255/value","1");
                            setNodeString("/sys/class/gpio/gpio1229/value","1");
                            break;
                    }   //end switch
                }   //handleMessage
        };  //end handler
        

        new Thread(){
            UsbManager mUsbManager = (UsbManager) USBDetectionService.this.getSystemService(Context.USB_SERVICE);
            @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
            @Override
            public void run() {
                super.run();
                // Log.i(TAG, "getUSBName().....................");
                while(true) {
			        String value=readFile("/sys/bus/iio/devices/iio:device0/in_voltage0_raw");
                    Log.d(TAG,"value--------------------------------------------------"+value);
                    int valueInt=Integer.parseInt(value);
                    if(valueInt>500){
                            Log.i(TAG_WP, ".....light......");
                            if(!isTurnONLed){
                            Log.i(TAG_WP, "light.....11......");
                             mHandler.removeMessages(1); //移除handle状态值
                             mHandler.sendEmptyMessage(2);
                             }
                    }//end if
                    else{
                            Log.i(TAG_WP, "Extinguish..............");
                            if(isTurnONLed){
                                isTurnONLed = false;    //此时设置开关状态，防止小于5s时候再次靠近操作
                                Log.i(TAG_WP, "Extinguish.......11.......");
                                mHandler.sendEmptyMessageDelayed(1,5000); //延迟5s发送
                            }
                        }//end else
                        try {
                            sleep(1000);    //1s check 1 time
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    ///////////////////////////////////////
                } //end while
            }

        }.start();  //end Theard
    }

 

本文地址：https://blog.csdn.net/yhm2046/article/details/107215086