Called when sensor values have changed.
The length and contents of the values array vary
depending on which sensor is being monitored.
See {@link android.hardware.SensorManager SensorManager}
for details on possible sensor types.
Definition of the coordinate system used below.
The X axis refers to the screen's horizontal axis
(the small edge in portrait mode, the long edge in landscape mode) and
points to the right.
The Y axis refers to the screen's vertical axis and points towards
the top of the screen (the origin is in the lower-left corner).
The Z axis points toward the sky when the device is lying on its back
on a table.
IMPORTANT NOTE: The axis are swapped when the
device's screen orientation changes. To access the unswapped values,
use indices 3, 4 and 5 in values[].
{@link android.hardware.SensorManager#SENSOR_ORIENTATION SENSOR_ORIENTATION},
{@link android.hardware.SensorManager#SENSOR_ORIENTATION_RAW SENSOR_ORIENTATION_RAW}:
All values are angles in degrees.
values[0]: Azimuth, rotation around the Z axis (0<=azimuth<360).
0 = North, 90 = East, 180 = South, 270 = West
values[1]: Pitch, rotation around X axis (-180<=pitch<=180), with positive
values when the z-axis moves toward the y-axis.
values[2]: Roll, rotation around Y axis (-90<=roll<=90), with positive values
when the z-axis moves toward the x-axis.
Note that this definition of yaw, pitch and roll is different from the
traditional definition used in aviation where the X axis is along the long
side of the plane (tail to nose).
{@link android.hardware.SensorManager#SENSOR_ACCELEROMETER SENSOR_ACCELEROMETER}:
All values are in SI units (m/s^2) and measure contact forces.
values[0]: force applied by the device on the x-axis
values[1]: force applied by the device on the y-axis
values[2]: force applied by the device on the z-axis
Examples:
When the device is pushed on its left side toward the right, the
x acceleration value is negative (the device applies a reaction force
to the push toward the left)
When the device lies flat on a table, the acceleration value is
{@link android.hardware.SensorManager#STANDARD_GRAVITY -STANDARD_GRAVITY},
which correspond to the force the device applies on the table in reaction
to gravity.
{@link android.hardware.SensorManager#SENSOR_MAGNETIC_FIELD SENSOR_MAGNETIC_FIELD}:
All values are in micro-Tesla (uT) and measure the ambient magnetic
field in the X, Y and -Z axis.
Note: the magnetic field's Z axis is inverted.
