Android Open Source - interdroid-swan Pressure 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 a2s .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;
import android.widget.Toast;

public class PressureSensor extends AbstractMemorySensor {

  public static final String TAG = "PressureSensor";

  /**
   * 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.pressure_preferences;
    }

  }

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

  public static final String PRESSURE_FIELD = "pressure";

  protected static final int HISTORY_SIZE = 30;

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

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

    public void onSensorChanged(SensorEvent event) {
      long now = System.currentTimeMillis();
      if (event.sensor.getType() == Sensor.TYPE_PRESSURE) {

        putValueTrimSize(PRESSURE_FIELD, null, now, event.values[0],
            HISTORY_SIZE);
      }
    }
  };

  @Override
  public String[] getValuePaths() {
    return new String[] { PRESSURE_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_PRESSURE);
    if (sensorList.size() > 0) {
      pressureSensor = sensorList.get(0);
    } else {
      Toast.makeText(getApplicationContext(),
          "No pressureSensor found on device!", Toast.LENGTH_SHORT)
          .show();
      Log.e(TAG, "No pressureSensor 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)) {
          highestAccuracy = Math
              .min(highestAccuracy,
                  Integer.parseInt(configuration
                      .getString(ACCURACY)));
        }
      }
      highestAccuracy = Math.max(highestAccuracy,
          SensorManager.SENSOR_DELAY_FASTEST);
      sensorManager.registerListener(sensorEventListener, pressureSensor,
          highestAccuracy);
    }

  }

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

  @Override
  public final void onDestroySensor() {
    sensorManager.unregisterListener(sensorEventListener);
  }
  
  @Override
  public float getCurrentMilliAmpere() {
    return pressureSensor.getPower();
  }
}

Java Source Code List