LightSensor.java

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// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2019 MIT, All rights reserved
// Released under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0
 
 
package com.google.appinventor.components.runtime;
 
import com.google.appinventor.components.annotations.DesignerComponent;
import com.google.appinventor.components.annotations.SimpleEvent;
import com.google.appinventor.components.annotations.SimpleObject;
import com.google.appinventor.components.annotations.SimpleProperty;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.common.YaVersion;
 
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
 
@DesignerComponent(version = YaVersion.LIGHTSENSOR_COMPONENT_VERSION,
    description = "A sensor component that can measure the light level.",
    category = ComponentCategory.SENSORS,
    nonVisible = true,
    iconName = "images/lightsensor.png")
@SimpleObject
public class LightSensor extends BufferedSingleValueSensor {
  private static final int BUFFER_SIZE = 10;
 
  public LightSensor(ComponentContainer container) {
    super(container.$form(), Sensor.TYPE_LIGHT, BUFFER_SIZE);
  }
 
  @Override
  protected void onValueChanged(float value) {
    LightChanged(value);
  }
  
  @SimpleEvent(description = "Called when a change is detected in the light level.")
  public void LightChanged(float lux) {
    EventDispatcher.dispatchEvent(this, "LightChanged", lux);
  }
 
  @SimpleProperty(description = "The most recent light level, in lux, if the sensor is available " +
       "and enabled.")
   public float Lux() {
    return getValue();
  }
 
  @SimpleProperty(description = "The average of the 10 most recent light levels measured, in lux.")
   public float AverageLux() {
    return getAverageValue();
  }
}