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Merge 4b999030

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Change-Id: Ibb94ba77ec8588f5e7636cf6a038b143e3dcb2bd
This commit is contained in:
Jean-Baptiste Queru
2011-05-18 15:33:27 -07:00
parent ba8fc5b059 4b999030ad
commit 111d17ce51
3 changed files with 77 additions and 1 deletions
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11
api/current.xml
View File

@ -93618,6 +93618,17 @@
visibility="public"
>
</field>
<field name="TYPE_RELATIVE_HUMIDITY"
type="int"
transient="false"
volatile="false"
value="12"
static="true"
final="true"
deprecated="not deprecated"
visibility="public"
>
</field>
<field name="TYPE_ROTATION_VECTOR"
type="int"
transient="false"

7
core/java/android/hardware/Sensor.java
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@ -97,6 +97,13 @@ public class Sensor {
*/
public static final int TYPE_ROTATION_VECTOR = 11;
/**
* A constant describing a relative humidity sensor type.
* See {@link android.hardware.SensorEvent SensorEvent}
* for more details.
*/
public static final int TYPE_RELATIVE_HUMIDITY = 12;
/**
* A constant describing all sensor types.
*/

58
core/java/android/hardware/SensorEvent.java
View File

@ -305,6 +305,64 @@ public class SensorEvent {
* positive in the counter-clockwise direction).
* </p>
*
* <h4>{@link android.hardware.Sensor#TYPE_RELATIVE_HUMIDITY
* Sensor.TYPE_RELATIVE_HUMIDITY}:</h4>
* <ul>
* <p>
* values[0]: Relative ambient air humidity in percent
* </p>
* </ul>
* <p>
* When relative ambient air humidity and ambient temperature are
* measured, the dew point and absolute humidity can be calculated.
* </p>
* <u>Dew Point</u>
* <p>
* The dew point is the temperature to which a given parcel of air must be
* cooled, at constant barometric pressure, for water vapor to condense
* into water.
* </p>
* <center><pre>
* ln(RH/100%) + m&#183;t/(T<sub>n</sub>+t)
* t<sub>d</sub>(t,RH) = T<sub>n</sub> &#183; ------------------------------
* m - [ln(RH/100%) + m&#183;t/(T<sub>n</sub>+t)]
* </pre></center>
* <dl>
* <dt>t<sub>d</sub></dt> <dd>dew point temperature in &deg;C</dd>
* <dt>t</dt> <dd>actual temperature in &deg;C</dd>
* <dt>RH</dt> <dd>actual relative humidity in %</dd>
* <dt>m</dt> <dd>17.62</dd>
* <dt>T<sub>n</sub></dt> <dd>243.12 &deg;C</dd>
* </dl>
* <p>for example:</p>
* <pre class="prettyprint">
* h = Math.log(rh / 100.0) + (17.62 * t) / (243.12 + t);
* td = 243.12 * h / (17.62 - h);
* </pre>
* <u>Absolute Humidity</u>
* <p>
* The absolute humidity is the mass of water vapor in a particular volume
* of dry air. The unit is g/m<sup>3</sup>.
* </p>
* <center><pre>
* RH/100%&#183;A&#183;exp(m&#183;t/(T<sub>n</sub>+t))
* d<sub>v</sub>(t,RH) = 216.7 &#183; -------------------------
* 273.15 + t
* </pre></center>
* <dl>
* <dt>d<sub>v</sub></dt> <dd>absolute humidity in g/m<sup>3</sup></dd>
* <dt>t</dt> <dd>actual temperature in &deg;C</dd>
* <dt>RH</dt> <dd>actual relative humidity in %</dd>
* <dt>m</dt> <dd>17.62</dd>
* <dt>T<sub>n</sub></dt> <dd>243.12 &deg;C</dd>
* <dt>A</dt> <dd>6.112 hPa</dd>
* </dl>
* <p>for example:</p>
* <pre class="prettyprint">
* dv = 216.7 *
* (rh / 100.0 * 6.112 * Math.exp(17.62 * t / (243.12 + t)) / (273.15 + t));
* </pre>
*
* @see SensorEvent
* @see GeomagneticField
*/