├── project.properties
├── proguard-project.txt
├── AndroidManifest.xml
├── src
    └── com
    │   └── google
    │       └── android
    │           └── apps
    │               └── simplepedometer
    │                   ├── StepListener.java
    │                   ├── SensorFusionMath.java
    │                   ├── SimplePedometerActivity.java
    │                   └── SimpleStepDetector.java
└── LICENSE


/project.properties:
--------------------------------------------------------------------------------
 1 | # This file is automatically generated by Android Tools.
 2 | # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
 3 | #
 4 | # This file must be checked in Version Control Systems.
 5 | #
 6 | # To customize properties used by the Ant build system edit
 7 | # "ant.properties", and override values to adapt the script to your
 8 | # project structure.
 9 | #
10 | # To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
11 | #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
12 | 
13 | # Project target.
14 | target=android-17
15 | 


--------------------------------------------------------------------------------
/proguard-project.txt:
--------------------------------------------------------------------------------
 1 | # To enable ProGuard in your project, edit project.properties
 2 | # to define the proguard.config property as described in that file.
 3 | #
 4 | # Add project specific ProGuard rules here.
 5 | # By default, the flags in this file are appended to flags specified
 6 | # in ${sdk.dir}/tools/proguard/proguard-android.txt
 7 | # You can edit the include path and order by changing the ProGuard
 8 | # include property in project.properties.
 9 | #
10 | # For more details, see
11 | #   http://developer.android.com/guide/developing/tools/proguard.html
12 | 
13 | # Add any project specific keep options here:
14 | 
15 | # If your project uses WebView with JS, uncomment the following
16 | # and specify the fully qualified class name to the JavaScript interface
17 | # class:
18 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
19 | #   public *;
20 | #}
21 | 


--------------------------------------------------------------------------------
/AndroidManifest.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3 |     package="com.google.android.apps.simplepedometer"
 4 |     android:versionCode="1"
 5 |     android:versionName="1.0" >
 6 | 
 7 |     <uses-sdk
 8 |         android:minSdkVersion="8"
 9 |         android:targetSdkVersion="17" />
10 | 
11 |     <application
12 |         android:allowBackup="true"
13 |         android:label="Simple Pedometer" >
14 |         <activity
15 |             android:name="com.google.android.apps.simplepedometer.SimplePedometerActivity"
16 |             android:label="Simple Pedometer" >
17 |             <intent-filter>
18 |                 <action android:name="android.intent.action.MAIN" />
19 |                 <category android:name="android.intent.category.LAUNCHER" />
20 |             </intent-filter>
21 |         </activity>
22 |     </application>
23 | 
24 | </manifest>


--------------------------------------------------------------------------------
/src/com/google/android/apps/simplepedometer/StepListener.java:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * Copyright 2013 Google Inc.
 3 |  *
 4 |  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 5 |  * use this file except in compliance with the License. You may obtain a copy of
 6 |  * the License at
 7 |  *
 8 |  * http://www.apache.org/licenses/LICENSE-2.0
 9 |  *
10 |  * Unless required by applicable law or agreed to in writing, software
11 |  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 |  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 |  * License for the specific language governing permissions and limitations under
14 |  * the License.
15 |  */
16 | 
17 | package com.google.android.apps.simplepedometer;
18 | 
19 | /**
20 |  * Listens for alerts about steps being detected.
21 |  */
22 | public interface StepListener {
23 | 
24 |   /**
25 |    * Called when a step has been detected.  Given the time in nanoseconds at
26 |    * which the step was detected.
27 |    */
28 |   public void step(long timeNs);
29 | 
30 | }


--------------------------------------------------------------------------------
/src/com/google/android/apps/simplepedometer/SensorFusionMath.java:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * Copyright 2013 Google Inc.
 3 |  *
 4 |  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 5 |  * use this file except in compliance with the License. You may obtain a copy of
 6 |  * the License at
 7 |  *
 8 |  * http://www.apache.org/licenses/LICENSE-2.0
 9 |  *
10 |  * Unless required by applicable law or agreed to in writing, software
11 |  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 |  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 |  * License for the specific language governing permissions and limitations under
14 |  * the License.
15 |  */
16 | 
17 | package com.google.android.apps.simplepedometer;
18 | 
19 | /**
20 |  * A collection of matrix and vector operations used specifically for sensor
21 |  * fusion.  These are purposefully specific so as to be fast.
22 |  */
23 | public class SensorFusionMath {
24 | 
25 |   private SensorFusionMath() {
26 |   }
27 | 
28 |   public static float sum(float[] array) {
29 |     float retval = 0;
30 |     for (int i = 0; i < array.length; i++) {
31 |       retval += array[i];
32 |     }
33 |     return retval;
34 |   }
35 | 
36 |   public static float[] cross(float[] arrayA, float[] arrayB) {
37 |     float[] retArray = new float[3];
38 |     retArray[0] = arrayA[1] * arrayB[2] - arrayA[2] * arrayB[1];
39 |     retArray[1] = arrayA[2] * arrayB[0] - arrayA[0] * arrayB[2];
40 |     retArray[2] = arrayA[0] * arrayB[1] - arrayA[1] * arrayB[0];
41 |     return retArray;
42 |   }
43 | 
44 |   public static float norm(float[] array) {
45 |     float retval = 0;
46 |     for (int i = 0; i < array.length; i++) {
47 |       retval += array[i] * array[i];
48 |     }
49 |     return (float) Math.sqrt(retval);
50 |   }
51 | 
52 |   // Note: only works with 3D vectors.
53 |   public static float dot(float[] a, float[] b) {
54 |     float retval = a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
55 |     return retval;
56 |   }
57 | 
58 |   public static float[] normalize(float[] a) {
59 |     float[] retval = new float[a.length];
60 |     float norm = norm(a);
61 |     for (int i = 0; i < a.length; i++) {
62 |       retval[i] = a[i] / norm;
63 |     }
64 |     return retval;
65 |   }
66 | 
67 | }


--------------------------------------------------------------------------------
/src/com/google/android/apps/simplepedometer/SimplePedometerActivity.java:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * Copyright 2013 Google Inc.
 3 |  *
 4 |  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 5 |  * use this file except in compliance with the License. You may obtain a copy of
 6 |  * the License at
 7 |  *
 8 |  * http://www.apache.org/licenses/LICENSE-2.0
 9 |  *
10 |  * Unless required by applicable law or agreed to in writing, software
11 |  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 |  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 |  * License for the specific language governing permissions and limitations under
14 |  * the License.
15 |  */
16 | 
17 | package com.google.android.apps.simplepedometer;
18 | 
19 | import android.app.Activity;
20 | import android.hardware.Sensor;
21 | import android.hardware.SensorEvent;
22 | import android.hardware.SensorEventListener;
23 | import android.hardware.SensorManager;
24 | import android.os.Bundle;
25 | import android.widget.TextView;
26 | 
27 | public class SimplePedometerActivity extends Activity implements SensorEventListener, StepListener {
28 |   private TextView textView;
29 |   private SimpleStepDetector simpleStepDetector;
30 |   private SensorManager sensorManager;
31 |   private Sensor accel;
32 |   private static final String TEXT_NUM_STEPS = "Number of Steps: ";
33 |   private int numSteps;
34 | 
35 |   @Override
36 |   protected void onCreate(Bundle savedInstanceState) {
37 |     super.onCreate(savedInstanceState);
38 |     textView = new TextView(this);
39 |     textView.setTextSize(30);
40 |     setContentView(textView);
41 | 
42 |     // Get an instance of the SensorManager
43 |     sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
44 |     accel = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
45 |     simpleStepDetector = new SimpleStepDetector();
46 |     simpleStepDetector.registerListener(this);
47 |   }
48 | 
49 |   @Override
50 |   public void onResume() {
51 |     super.onResume();
52 |     numSteps = 0;
53 |     textView.setText(TEXT_NUM_STEPS + numSteps);
54 |     sensorManager.registerListener(this, accel, SensorManager.SENSOR_DELAY_FASTEST);
55 |   }
56 | 
57 |   @Override
58 |   public void onPause() {
59 |     super.onPause();
60 |     sensorManager.unregisterListener(this);
61 |   }
62 | 
63 |   @Override
64 |   public void onAccuracyChanged(Sensor sensor, int accuracy) {
65 |   }
66 | 
67 |   @Override
68 |   public void onSensorChanged(SensorEvent event) {
69 |     if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
70 |       simpleStepDetector.updateAccel(
71 |           event.timestamp, event.values[0], event.values[1], event.values[2]);
72 |     }
73 |   }
74 |   
75 |   @Override
76 |   public void step(long timeNs) {
77 |     numSteps++;
78 |     textView.setText(TEXT_NUM_STEPS + numSteps);
79 |   }
80 | 
81 | }
82 | 


--------------------------------------------------------------------------------
/src/com/google/android/apps/simplepedometer/SimpleStepDetector.java:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * Copyright 2013 Google Inc.
 3 |  *
 4 |  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 5 |  * use this file except in compliance with the License. You may obtain a copy of
 6 |  * the License at
 7 |  *
 8 |  * http://www.apache.org/licenses/LICENSE-2.0
 9 |  *
10 |  * Unless required by applicable law or agreed to in writing, software
11 |  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 |  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 |  * License for the specific language governing permissions and limitations under
14 |  * the License.
15 |  */
16 | 
17 | package com.google.android.apps.simplepedometer;
18 | 
19 | /**
20 |  * Receives sensor updates and alerts a StepListener when a step has been detected.
21 |  */
22 | public class SimpleStepDetector {
23 | 
24 |   private static final int ACCEL_RING_SIZE = 50;
25 |   private static final int VEL_RING_SIZE = 10;
26 |   private static final float STEP_THRESHOLD = 4f;
27 |   private static final int STEP_DELAY_NS = 250000000;
28 | 
29 |   private int accelRingCounter = 0;
30 |   private float[] accelRingX = new float[ACCEL_RING_SIZE];
31 |   private float[] accelRingY = new float[ACCEL_RING_SIZE];
32 |   private float[] accelRingZ = new float[ACCEL_RING_SIZE];
33 |   private int velRingCounter = 0;
34 |   private float[] velRing = new float[VEL_RING_SIZE];
35 |   private long lastStepTimeNs = 0;
36 |   private float oldVelocityEstimate = 0;
37 | 
38 |   private StepListener listener;
39 | 
40 |   public void registerListener(StepListener listener) {
41 |     this.listener = listener;
42 |   }
43 | 
44 |   /**
45 |    * Accepts updates from the accelerometer.
46 |    */
47 |   public void updateAccel(long timeNs, float x, float y, float z) {
48 |     float[] currentAccel = new float[3];
49 |     currentAccel[0] = x;
50 |     currentAccel[1] = y;
51 |     currentAccel[2] = z;
52 | 
53 |     // First step is to update our guess of where the global z vector is.
54 |     accelRingCounter++;
55 |     accelRingX[accelRingCounter % ACCEL_RING_SIZE] = currentAccel[0];
56 |     accelRingY[accelRingCounter % ACCEL_RING_SIZE] = currentAccel[1];
57 |     accelRingZ[accelRingCounter % ACCEL_RING_SIZE] = currentAccel[2];
58 | 
59 |     float[] worldZ = new float[3];
60 |     worldZ[0] = SensorFusionMath.sum(accelRingX) / Math.min(accelRingCounter, ACCEL_RING_SIZE);
61 |     worldZ[1] = SensorFusionMath.sum(accelRingY) / Math.min(accelRingCounter, ACCEL_RING_SIZE);
62 |     worldZ[2] = SensorFusionMath.sum(accelRingZ) / Math.min(accelRingCounter, ACCEL_RING_SIZE);
63 | 
64 |     float normalization_factor = SensorFusionMath.norm(worldZ);
65 | 
66 |     worldZ[0] = worldZ[0] / normalization_factor;
67 |     worldZ[1] = worldZ[1] / normalization_factor;
68 |     worldZ[2] = worldZ[2] / normalization_factor;
69 | 
70 |     // Next step is to figure out the component of the current acceleration
71 |     // in the direction of world_z and subtract gravity's contribution
72 |     float currentZ = SensorFusionMath.dot(worldZ, currentAccel) - normalization_factor;
73 |     velRingCounter++;
74 |     velRing[velRingCounter % VEL_RING_SIZE] = currentZ;
75 | 
76 |     float velocityEstimate = SensorFusionMath.sum(velRing);
77 | 
78 |     if (velocityEstimate > STEP_THRESHOLD && oldVelocityEstimate <= STEP_THRESHOLD
79 |         && (timeNs - lastStepTimeNs > STEP_DELAY_NS)) {
80 |       listener.step(timeNs);
81 |       lastStepTimeNs = timeNs;
82 |     }
83 |     oldVelocityEstimate = velocityEstimate;
84 |   }
85 | }


--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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