Android Open Source - interdroid-swan Movement Sensor

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License

The source code is released under:

Copyright (c) 2008-2011 Vrije Universiteit, The Netherlands All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follo...

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Java Source Code

package interdroid.swan.sensors.impl;
//from  w  ww.j a v  a 2s  .  c o m
import interdroid.swan.R;
import interdroid.swan.sensors.AbstractConfigurationActivity;
import interdroid.swan.sensors.AbstractMemorySensor;

import java.util.List;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.util.Log;

public class MovementSensor extends AbstractMemorySensor {

  public static final String TAG = "MovementSensor";

  /**
   * The configuration activity for this sensor.
   * 
   * @author nick &lt;palmer@cs.vu.nl&gt;
   * 
   */
  public static class ConfigurationActivity extends
      AbstractConfigurationActivity {

    @Override
    public final int getPreferencesXML() {
      return R.xml.movement_preferences;
    }

  }

  /** Value of ACCURACY must be one of SensorManager.SENSOR_DELAY_* */
  public static final String ACCURACY = "accuracy";

  public static final String X_FIELD = "x";
  public static final String Y_FIELD = "y";
  public static final String Z_FIELD = "z";
  public static final String TOTAL_FIELD = "total";

  protected static final int HISTORY_SIZE = 80 * 160; //hz x seconds

  private Sensor accelerometer;
  private SensorManager sensorManager;
  private SensorEventListener sensorEventListener = new SensorEventListener() {

    public void onAccuracyChanged(Sensor sensor, int accuracy) {
      if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
        currentConfiguration.putInt(ACCURACY, accuracy);
      }
    }

    public void onSensorChanged(SensorEvent event) {
      long now = System.currentTimeMillis();
      if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
        for (int i = 0; i < 3; i++) {
          putValueTrimSize(VALUE_PATHS[i], null, now,
              (double) event.values[i], HISTORY_SIZE);
        }
        double len2 = (double) Math.sqrt(event.values[0]
            * event.values[0] + event.values[1] * event.values[1]
            + event.values[2] * event.values[2]);
        putValueTrimSize(TOTAL_FIELD, null, now, len2, HISTORY_SIZE);
      }
    }
  };

  @Override
  public String[] getValuePaths() {
    return new String[] { X_FIELD, Y_FIELD, Z_FIELD, TOTAL_FIELD };
  }

  @Override
  public void initDefaultConfiguration(Bundle DEFAULT_CONFIGURATION) {
    DEFAULT_CONFIGURATION.putInt(ACCURACY,
        SensorManager.SENSOR_DELAY_NORMAL);
  }

  @Override
  public void onConnected() {
    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    List<Sensor> sensorList = sensorManager
        .getSensorList(Sensor.TYPE_ACCELEROMETER);
    if (sensorList.size() > 0) {
      accelerometer = sensorList.get(0);
    } else {
      Log.e(TAG, "No accelerometer found on device!");
    }
  }

  @Override
  public final void register(String id, String valuePath, Bundle configuration) {
    updateAccuracy();
  }

  private void updateAccuracy() {
    sensorManager.unregisterListener(sensorEventListener);
    if (registeredConfigurations.size() > 0) {

      int highestAccuracy = mDefaultConfiguration.getInt(ACCURACY);
      for (Bundle configuration : registeredConfigurations.values()) {
        if (configuration == null) {
          continue;
        }
        if (configuration.containsKey(ACCURACY)) {
          // accuracy can be string or int
          if (configuration.getString(ACCURACY, null) == null) {
            highestAccuracy = Math.min(highestAccuracy,
                configuration.getInt(ACCURACY));
          } else {
            highestAccuracy = Math.min(highestAccuracy, Integer
                .parseInt(configuration.getString(ACCURACY)));
          }

        }
      }
      highestAccuracy = Math.max(highestAccuracy,
          SensorManager.SENSOR_DELAY_FASTEST);
      sensorManager.registerListener(sensorEventListener, accelerometer,
          highestAccuracy);
    }

  }

  @Override
  public final void unregister(String id) {
    updateAccuracy();
  }

  @Override
  public final void onDestroySensor() {
    sensorManager.unregisterListener(sensorEventListener);
  }

  @Override
  public float getCurrentMilliAmpere() {
    return accelerometer.getPower();
  }
}

Java Source Code List