Question

首先抱歉这个愚蠢的问题。

我试图做的是每秒捕获加速度计数据三秒并添加该数据，但由于缺乏经验，我发现很难做到这一点。 / p>

到目前为止我所做的是：

实时获取 X，Y，X轴的加速度数据，并计算得到的加速度为 resul_acceleration = Math.sqrt（X ^ 2 + y ^ 2 + z ^ 2）< / strong>也是实时，并且随时间不断变化。

我想做的是：

在第一，第二和第三秒结束时找到 resul_acceleration ，即 a1，a2，a3 和返回（a1 + a2 + a3）我经历艰难的时期在java中编写一个完成任务的方法。

public void onSensorChanged(SensorEvent event) { final ArrayList<Double> accln = new ArrayList<>(); //enter your code here float x = event.values[0]; float y = event.values[1]; float z = event.values[2]; if (!mInitialized) { mLastX = x; mLastY = y; mLastZ = z; mInitialized = true; } else { float deltaX = Math.abs(mLastX - x); float deltaY = Math.abs(mLastY - y); float deltaZ = Math.abs(mLastZ - z); if (deltaX < NOISE) deltaX = (float) 0.0; if (deltaY < NOISE) deltaY = (float) 0.0; if (deltaZ < NOISE) deltaZ = (float) 0.0; mLastX = x; mLastY = y; mLastZ = z; final double a =Math.sqrt((deltaX*deltaX)+(deltaY*deltaY)+(deltaZ*deltaZ)); accln.add(a); //what i am trying to do here is collect the sample data of acceleration in an array list for 3 seconds,// so later i can calculate average acceleration } }

Answer 1

我建议启动一个计时器，然后当它达到1000毫秒时进行测量，然后是2000和3000.这可能会有所帮助： Android timer? How-to?

Answer 2

解决了问题

只需使用Timer类方法每1秒做一次

new Timer().scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {

                                     // Just calculate your accleration here

                              }
                                                 }, 0, 1000);

Answer 3

你从来没有提到你试图获得加速数据的速度，所以我认为它将在~5hz（SENSOR_DELAY_NORMAL）。请记住，这只是一个提示。如果另一个应用程序以更快的速度注册加速度传感器数据，您可能会以更快的速度获取事件。至于代码：

// SOMEWHERE IN YOUR APP

final ArrayList<Double> accln = new ArrayList<>(); //THIS SHOULD BE OUTSIDE YOUR CALLBACK!

final SensorEventListener eventListener = new SensorEventListener() {
                @Override
                public void onSensorChanged(SensorEvent event) {
                    //enter your code here
                    float x = event.values[0];
                    float y = event.values[1];
                    float z = event.values[2];
                    if (!mInitialized) {
                        mLastX = x;
                        mLastY = y;
                        mLastZ = z;

                        mInitialized = true;
                    } else {
                        float deltaX = Math.abs(mLastX - x);
                        float deltaY = Math.abs(mLastY - y);
                        float deltaZ = Math.abs(mLastZ - z);
                        if (deltaX < NOISE) deltaX = (float) 0.0;
                        if (deltaY < NOISE) deltaY = (float) 0.0;
                        if (deltaZ < NOISE) deltaZ = (float) 0.0;
                        mLastX = x;
                        mLastY = y;
                        mLastZ = z;

                        final double a = Math.sqrt((deltaX * deltaX) + (deltaY * deltaY) + (deltaZ * deltaZ));
                        accln.add(a); //what i am trying to do here is collect the sample data of acceleration in an array list for 3 seconds,// so later i can calculate average acceleration

                    }
                }

                @Override
                public void onAccuracyChanged(Sensor sensor, int accuracy) {
                }
            };

SensorManager sensorManager = (SensorManager) context.getSystemService(SENSOR_SERVICE);
Handler handler = new Handler();
Sensor accel = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sensorManager.registerListener(eventListener, accel, SensorManager.SENSOR_DELAY_NORMAL);  //~5hz of data
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        sensorManager.unregisterListener(eventListener);
    }
}, 5000);

这将注册你的监听器并在5秒后从处理程序runnable中取消注册。

如何在3秒钟内存储和使用加速度计的数据？

3 个答案:

解决了问题