Android Open Source - VTTPhysicalActivityLibrary Walk Detection

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License

The source code is released under:

Copyright (c) 2013, VTT Technical Research Centre of Finland All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the ...

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Java Source Code

/*
 * Copyright (c) 2013, VTT Technical Research Centre of Finland 
 * All rights reserved. /*ww w.j  ava  2 s. co  m*/
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 * 3. Neither the name of the VTT Technical Research Centre of Finland nor the 
 *    names of its contributors may be used to endorse or promote products 
 *    derived from this software without specific prior written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 * 
 */

package fi.vtt.physicalactivitylibrary.internal;

import fi.vtt.physicalactivitylibrary.VTTPhysicalActivityLibrary;
import java.util.ArrayList;

/**
 * Walk detection, implements DataCollectorObserver. 
 * 
 * @see  fi.vtt.physicalactivitylibrary.internal.DataCollectorObserver 
 *
 */

public final class WalkDetection implements DataCollectorObserver {

  private double walkValueDouble = 0.0;

  @Override
  public double getValue() {
    return walkValueDouble;
  }

  @Override
  public int getIdentifier() {
    return VTTPhysicalActivityLibrary.DETECTION_WALK;
  }

  public native double doWalkDetection(float[] xFloatArrayIncoming, float[] yFloatArrayIncoming, float[] zFloatArrayIncoming, long[] timeLongArrayIncoming);

  @Override
  public String getTag() {
    return "WalkDetection";
  }

  @Override
  public void dataCollectedNotify(RawData rawDataIncoming) {
    if (!rawDataIncoming.hasAccelerometerData()) {
      walkValueDouble = 0.0; // No data. 
      return; // No reason to continue without data. 
    }

    ArrayList<Float> xFloatArrayList = rawDataIncoming.getAccelerometerXBuffer();
    ArrayList<Float> yFloatArrayList = rawDataIncoming.getAccelerometerYBuffer();
    ArrayList<Float> zFloatArrayList = rawDataIncoming.getAccelerometerZBuffer();

    ArrayList<Long> timeLongArrayList = rawDataIncoming.getAccelerometerTimeBuffer();

    if (timeLongArrayList.size() < 16) {
      walkValueDouble = 0.0; // No data. 
      return; // Cannot continue with too few data points. 
    }

    float[] xFloatArray = new float[xFloatArrayList.size()];
    float[] yFloatArray = new float[yFloatArrayList.size()];
    float[] zFloatArray = new float[zFloatArrayList.size()];

    long[] timeLongArray = new long[timeLongArrayList.size()];

    for (int i = 0; i < xFloatArrayList.size(); i++) {
      xFloatArray[i] = xFloatArrayList.get(i);
    }

    for (int i = 0; i < yFloatArrayList.size(); i++) {
      yFloatArray[i] = yFloatArrayList.get(i);
    }

    for (int i = 0; i < zFloatArrayList.size(); i++) {
      zFloatArray[i] = zFloatArrayList.get(i);
    }

    for (int i = 0; i < timeLongArrayList.size(); i++) {
      timeLongArray[i] = timeLongArrayList.get(i);
    }

    walkValueDouble = doWalkDetection(xFloatArray, yFloatArray, zFloatArray, timeLongArray);
  }

}

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