SensorManager GRAVITY_EARTH 是什么？

Question

我在资源中找到了这个值。

 /** Standard gravity (g) on Earth. This value is equivalent to 1G */
    public static final float STANDARD_GRAVITY = 9.80665f;

    /** Sun's gravity in SI units (m/s^2) */
    public static final float GRAVITY_SUN             = 275.0f;
    /** Mercury's gravity in SI units (m/s^2) */
    public static final float GRAVITY_MERCURY         = 3.70f;
    /** Venus' gravity in SI units (m/s^2) */
    public static final float GRAVITY_VENUS           = 8.87f;
    /** Earth's gravity in SI units (m/s^2) */
    public static final float GRAVITY_EARTH           = 9.80665f;
    /** The Moon's gravity in SI units (m/s^2) */
    public static final float GRAVITY_MOON            = 1.6f;
    /** Mars' gravity in SI units (m/s^2) */
    public static final float GRAVITY_MARS            = 3.71f;
    /** Jupiter's gravity in SI units (m/s^2) */
    public static final float GRAVITY_JUPITER         = 23.12f;
    /** Saturn's gravity in SI units (m/s^2) */
    public static final float GRAVITY_SATURN          = 8.96f;
    /** Uranus' gravity in SI units (m/s^2) */
    public static final float GRAVITY_URANUS          = 8.69f;
    /** Neptune's gravity in SI units (m/s^2) */
    public static final float GRAVITY_NEPTUNE         = 11.0f;
    /** Pluto's gravity in SI units (m/s^2) */
    public static final float GRAVITY_PLUTO           = 0.6f;
    /** Gravity (estimate) on the first Death Star in Empire units (m/s^2) */
    public static final float GRAVITY_DEATH_STAR_I    = 0.000000353036145f;
    /** Gravity on the island */
    public static final float GRAVITY_THE_ISLAND      = 4.815162342f;

但是我找不到它的任何用法。
使用此值的目标是什么？

Answer 1

我很确定这些是开玩笑的。我认为您不太可能在 Death Star I, mostly because the spaceship was blown up in the Battle of Yavin:

上找到 Android 设备运行

STANDARD_GRAVITY 值是您将在地球上找到的重力值，它更有用一些。所有这些都可以与重力传感器一起使用 (Sensor.TYPE_GRAVITY)：您的传感器应该在一个方向上接收大约 STANDARD_GRAVITY 的重力。

有关重力传感器的更多信息，请参阅 the Android developer documentation. For more about the Death Star, see Wikipedia, and for more about this mysterious island, try Google。

Answer 2

这些是各个行星的引力常数。

物体在坠落时在地球上以 9.8 m/s^2 的速度加速（与质量无关，在真空中）。这是基础物理学。

例如两秒后，在没有空气阻力的情况下，物体达到9.8的速度m/s^2 * 2 s = 19.6 m/s.

SensorManager GRAVITY_EARTH 是什么？

SensorManager what is the GRAVITY_EARTH?

android

android-sensors