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Commit 04d7e83e authored by Mathias Agopian's avatar Mathias Agopian
Browse files

Added SensorManager.getAltitude() 

this is a helper function to calculate the altitude from the
pressure and pressure at sea level.

Change-Id: I3f6f14fee6190388f95afa36a66287e3d59eef9b
parent 050b5624

api/current.xml

+26 −0
Original line number Diff line number Diff line
@@ -77858,6 +77858,21 @@ 
 deprecated="not deprecated"

 visibility="public"

>

<method name="getAltitude"

 return="float"

 abstract="false"

 native="false"

 synchronized="false"

 static="true"

 final="false"

 deprecated="not deprecated"

 visibility="public"

>

<parameter name="p0" type="float">

</parameter>

<parameter name="p" type="float">

</parameter>

</method>

<method name="getDefaultSensor"

 return="android.hardware.Sensor"

 abstract="false"
@@ -78437,6 +78452,17 @@ 
 visibility="public"

>

</field>

<field name="PRESSURE_STANDARD_ATMOSPHERE"

 type="float"

 transient="false"

 volatile="false"

 value="1013.25f"

 static="true"

 final="true"

 deprecated="not deprecated"

 visibility="public"

>

</field>

<field name="RAW_DATA_INDEX"

 type="int"

 transient="false"

core/java/android/hardware/SensorManager.java

+30 −7
Original line number Diff line number Diff line
@@ -268,6 +268,10 @@ public class SensorManager 
    public static final float MAGNETIC_FIELD_EARTH_MIN = 30.0f;





    /** Standard atmosphere, or average sea-level pressure in hPa (millibar) */

    public static final float PRESSURE_STANDARD_ATMOSPHERE = 1013.25f;





    /** Maximum luminance of sunlight in lux */

    public static final float LIGHT_SUNLIGHT_MAX = 120000.0f;

    /** luminance of sunlight in lux */
@@ -1514,6 +1518,25 @@ public class SensorManager 
        return values;

    }



    /**

     * Computes the Altitude in meters from the atmospheric pressure and the

     * pressure at sea level.

     * <p>

     * Typically the atmospheric pressure is read from a

     * {@link Sensor#TYPE_PRESSURE} sensor. The pressure at sea level must be

     * known, usually it can be retrieved from airport databases in the

     * vicinity.

     * </p>

     *

     * @param p0 pressure at sea level

     * @param p atmospheric pressure

     * @return Altitude in meters

     */

   public static float getAltitude(float p0, float p) {

        final float coef = 1.0f / 5.255f;

        return 44330.0f * (1.0f - (float)Math.pow(p/p0, coef));

    }





   /**

     * {@hide}