Hygrometer.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.DesignerProperty;
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.hardware.Sensor;
 
@DesignerComponent(version = YaVersion.HYGROMETER_COMPONENT_VERSION,
    description = "A sensor component that can measure the relative ambient air humidity. " +
        "Most Android devices do not have this sensor.",
    category = ComponentCategory.SENSORS,
    nonVisible = true,
    iconName = "images/hygrometer.png")
@SimpleObject
public class Hygrometer extends SingleValueSensor {
  public Hygrometer(ComponentContainer container) {
    super(container.$form(), Sensor.TYPE_RELATIVE_HUMIDITY);
  }
 
  @Override
  protected void onValueChanged(float value) {
    HumidityChanged(value);
  }
  
  @SimpleEvent(
      description = "Called when a change is detected in the ambient air humidity (expressed as a percentage).")
  public void HumidityChanged(float humidity) {
    EventDispatcher.dispatchEvent(this, "HumidityChanged", humidity);
  }
 
  @SimpleProperty(description = "The relative ambient humidity as a percentage, if the sensor is available " +
      "and enabled.")
   public float Humidity() {
      return getValue();
  }
}