在android中，在精确的n毫秒后重复一项任务

Question

我的要求是在每毫秒精确采样一次android传感器数据。

尝试使用timer、alarmManager和handler。任务重复，但持续时间不是精确的n毫秒。

代码：：

手柄：

Handler sensorHandler = new Handler();
    private Runnable sensorRunnable = new Runnable() {
        @Override
        public void run() {
            sendAllSensorData();
            sensorHandler.postDelayed(sensorRunnable, 50);
        }
    };

    private void postSensorMsgHandler() {
        sensorHandler.postDelayed(sensorRunnable, 50);
    }

Timer :：私有的void initTimer() {

timer =新计时器()；

timer.scheduleAtFixedRate(new TimerTask() {
    public void run() {
        sendAllSensorData();
    }
}, TelemetricConstant.delay, TelemetricConstant.SAMPLE_PERIOD);

}

日志：

06-22 15:34:53.201 D/Telemetric(27434): Telemetric Gyroscope Y mean = -0.000533 sd = 0.000958 variance = 0.000001

06-22 15:34:53.212 D/Telemetric(27434): Telemetric Gyroscope Y mean = 0.001057 sd = 0.000000 variance = 0.000000

06-22 15:34:53.253 D/Telemetric(27434): Telemetric Gyroscope Y mean = 0.000524 sd = 0.000754 variance = 0.000001

06-22 15:34:53.264 D/Telemetric(27434): Telemetric Gyroscope Y mean = -0.000009 sd = 0.001066 variance = 0.000001

06-22 15:34:53.306 D/Telemetric(27434): Telemetric Gyroscope Y mean = 0.000524 sd = 0.001376 variance = 0.000002

06-22 15:34:53.317 D/Telemetric(27434): Telemetric Gyroscope Y mean = 0.000844 sd = 0.001390 variance = 0.000002

06-22 15:34:53.361 D/Telemetric(27434): Telemetric Gyroscope Y mean = 0.000702 sd = 0.001291 variance = 0.000002

06-22 15:34:53.370 D/Telemetric(27434): Telemetric Gyroscope Y mean = 0.000600 sd = 0.001209 variance = 0.000001

06-22 15:34:53.414 D/Telemetric(27434): Telemetric Gyroscope Y mean = 0.000391 sd = 0.001266 variance = 0.000002

06-22 15:34:53.423 D/Telemetric(27434): Telemetric Gyroscope Y mean = 0.000465 sd = 0.001205 variance = 0.000001

Answer 1

试试这个，

//Create Timer Object 
Timer t = new Timer();
//Set your schedule time
t.scheduleAtFixedRate(new TimerTask() {

    @Override
    public void run() {
        //Called each time when 1000 milliseconds (1 second)
    }

},
//Set start timing (milliseconds)
0,
//Set interval time(milliseconds)
1000);

Answer 2

Android并不是一个“实时操作系统”来获得你想要的高度精确，你可能需要另一个硬件，例如，一些嵌入了Raspberry的硬件.和另一个操作系统，例如一些"RealTime Linux“13x.pdf。

Answer 3

为什么不使用Android框架的常规传感器轮询机制呢？

https://developer.android.com/reference/android/hardware/SensorManager.html#registerListener(android.hardware.SensorEventListener,%20android.hardware.Sensor,%20int)