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Summary: Nested Classes | Constants | Methods | Inherited Methods

# SensorManager

`public abstract class SensorManager`
`extends Object` ``

java.lang.Object
↳ | android.hardware.SensorManager

SensorManager lets you access the device's `sensors`.

Always make sure to disable sensors you don't need, especially when your activity is paused. Failing to do so can drain the battery in just a few hours. Note that the system will not disable sensors automatically when the screen turns off.

Note: Don't use this mechanism with a Trigger Sensor, have a look at `TriggerEventListener`. `Sensor#TYPE_SIGNIFICANT_MOTION` is an example of a trigger sensor.

In order to access sensor data at high sampling rates (i.e. greater than 200 Hz for `SensorEventListener` and greater than `SensorDirectChannel#RATE_NORMAL` for `SensorDirectChannel`), apps must declare the `Manifest.permission.HIGH_SAMPLING_RATE_SENSORS` permission in their AndroidManifest.xml file.

     public class SensorActivity extends Activity implements SensorEventListener {
         private final SensorManager mSensorManager;
         private final Sensor mAccelerometer;

         public SensorActivity() {
             mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
             mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
         }

         protected void onResume() {
             super.onResume();
             mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
         }

         protected void onPause() {
             super.onPause();
             mSensorManager.unregisterListener(this);
         }

         public void onAccuracyChanged(Sensor sensor, int accuracy) {
         }

         public void onSensorChanged(SensorEvent event) {
         }
     }

See also:

- `SensorEventListener`
- `SensorEvent`
- `Sensor`

## Summary

### Nested classes
`class` | `SensorManager.DynamicSensorCallback` Used for receiving notifications from the SensorManager when dynamic sensors are connected or disconnected.

### Constants
`int` | `AXIS_MINUS_X` see `remapCoordinateSystem(float[], int, int, float[])`
`int` | `AXIS_MINUS_Y` see `remapCoordinateSystem(float[], int, int, float[])`
`int` | `AXIS_MINUS_Z` see `remapCoordinateSystem(float[], int, int, float[])`
`int` | `AXIS_X` see `remapCoordinateSystem(float[], int, int, float[])`
`int` | `AXIS_Y` see `remapCoordinateSystem(float[], int, int, float[])`
`int` | `AXIS_Z` see `remapCoordinateSystem(float[], int, int, float[])`
`int` | `DATA_X` This constant is deprecated. use `Sensor` instead.
`int` | `DATA_Y` This constant is deprecated. use `Sensor` instead.
`int` | `DATA_Z` This constant is deprecated. use `Sensor` instead.
`float` | `GRAVITY_DEATH_STAR_I` Gravity (estimate) on the first Death Star in Empire units (m/s^2)
`float` | `GRAVITY_EARTH` Earth's gravity in SI units (m/s^2)
`float` | `GRAVITY_JUPITER` Jupiter's gravity in SI units (m/s^2)
`float` | `GRAVITY_MARS` Mars' gravity in SI units (m/s^2)
`float` | `GRAVITY_MERCURY` Mercury's gravity in SI units (m/s^2)
`float` | `GRAVITY_MOON` The Moon's gravity in SI units (m/s^2)
`float` | `GRAVITY_NEPTUNE` Neptune's gravity in SI units (m/s^2)
`float` | `GRAVITY_PLUTO` Pluto's gravity in SI units (m/s^2)
`float` | `GRAVITY_SATURN` Saturn's gravity in SI units (m/s^2)
`float` | `GRAVITY_SUN` Sun's gravity in SI units (m/s^2)
`float` | `GRAVITY_THE_ISLAND` Gravity on the island
`float` | `GRAVITY_URANUS` Uranus' gravity in SI units (m/s^2)
`float` | `GRAVITY_VENUS` Venus' gravity in SI units (m/s^2)
`float` | `LIGHT_CLOUDY` luminance under a cloudy sky in lux
`float` | `LIGHT_FULLMOON` luminance at night with full moon in lux
`float` | `LIGHT_NO_MOON` luminance at night with no moon in lux
`float` | `LIGHT_OVERCAST` luminance under an overcast sky in lux
`float` | `LIGHT_SHADE` luminance in shade in lux
`float` | `LIGHT_SUNLIGHT` luminance of sunlight in lux
`float` | `LIGHT_SUNLIGHT_MAX` Maximum luminance of sunlight in lux
`float` | `LIGHT_SUNRISE` luminance at sunrise in lux
`float` | `MAGNETIC_FIELD_EARTH_MAX` Maximum magnetic field on Earth's surface
`float` | `MAGNETIC_FIELD_EARTH_MIN` Minimum magnetic field on Earth's surface
`float` | `PRESSURE_STANDARD_ATMOSPHERE` Standard atmosphere, or average sea-level pressure in hPa (millibar)
`int` | `RAW_DATA_INDEX` This constant is deprecated. use `Sensor` instead.
`int` | `RAW_DATA_X` This constant is deprecated. use `Sensor` instead.
`int` | `RAW_DATA_Y` This constant is deprecated. use `Sensor` instead.
`int` | `RAW_DATA_Z` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_ACCELEROMETER` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_ALL` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_DELAY_FASTEST` get sensor data as fast as possible
`int` | `SENSOR_DELAY_GAME` rate suitable for games
`int` | `SENSOR_DELAY_NORMAL` rate (default) suitable for screen orientation changes
`int` | `SENSOR_DELAY_UI` rate suitable for the user interface
`int` | `SENSOR_LIGHT` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_MAGNETIC_FIELD` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_MAX` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_MIN` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_ORIENTATION` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_ORIENTATION_RAW` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_PROXIMITY` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_STATUS_ACCURACY_HIGH` This sensor is reporting data with maximum accuracy
`int` | `SENSOR_STATUS_ACCURACY_LOW` This sensor is reporting data with low accuracy, calibration with the environment is needed
`int` | `SENSOR_STATUS_ACCURACY_MEDIUM` This sensor is reporting data with an average level of accuracy, calibration with the environment may improve the readings
`int` | `SENSOR_STATUS_NO_CONTACT` The values returned by this sensor cannot be trusted because the sensor had no contact with what it was measuring (for example, the heart rate monitor is not in contact with the user).
`int` | `SENSOR_STATUS_UNRELIABLE` The values returned by this sensor cannot be trusted, calibration is needed or the environment doesn't allow readings
`int` | `SENSOR_TEMPERATURE` This constant is deprecated. use `Sensor` instead.
`int` | `SENSOR_TRICORDER` This constant is deprecated. use `Sensor` instead.
`float` | `STANDARD_GRAVITY` Standard gravity (g) on Earth.

### Public methods
`boolean` | `cancelTriggerSensor(TriggerEventListener listener, Sensor sensor)` Cancels receiving trigger events for a trigger sensor.
`SensorDirectChannel` | `createDirectChannel(MemoryFile mem)` Create a sensor direct channel backed by shared memory wrapped in MemoryFile object.
`SensorDirectChannel` | `createDirectChannel(HardwareBuffer mem)` Create a sensor direct channel backed by shared memory wrapped in HardwareBuffer object.
`boolean` | `flush(SensorEventListener listener)` Flushes the FIFO of all the sensors registered for this listener.
`static float` | `getAltitude(float p0, float p)` Computes the Altitude in meters from the atmospheric pressure and the pressure at sea level.
`static void` | `getAngleChange(float[] angleChange, float[] R, float[] prevR)` Helper function to compute the angle change between two rotation matrices.
`Sensor` | `getDefaultSensor(int type)` Use this method to get the default sensor for a given type.
`Sensor` | `getDefaultSensor(int type, boolean wakeUp)` Return a Sensor with the given type and wakeUp properties.
`List<Sensor>` | `getDynamicSensorList(int type)` Use this method to get a list of available dynamic sensors of a certain type.
`static float` | `getInclination(float[] I)` Computes the geomagnetic inclination angle in radians from the inclination matrix I returned by `getRotationMatrix(float[], float[], float[], float[])`.
`static float[]` | `getOrientation(float[] R, float[] values)` Computes the device's orientation based on the rotation matrix.
`static void` | `getQuaternionFromVector(float[] Q, float[] rv)` Helper function to convert a rotation vector to a normalized quaternion.
`static boolean` | `getRotationMatrix(float[] R, float[] I, float[] gravity, float[] geomagnetic)` Computes the inclination matrix I as well as the rotation matrix R transforming a vector from the device coordinate system to the world's coordinate system which is defined as a direct orthonormal basis, where: X is defined as the vector product Y.Z (It is tangential to the ground at the device's current location and roughly points East).
`static void` | `getRotationMatrixFromVector(float[] R, float[] rotationVector)` Helper function to convert a rotation vector to a rotation matrix.
`List<Sensor>` | `getSensorList(int type)` Use this method to get the list of available sensors of a certain type.
`int` | `getSensors()` This method is deprecated. This method is deprecated, use `SensorManager#getSensorList(int)` instead
`boolean` | `isDynamicSensorDiscoverySupported()` Tell if dynamic sensor discovery feature is supported by system.
`void` | `registerDynamicSensorCallback(SensorManager.DynamicSensorCallback callback)` Add a `DynamicSensorCallback` to receive dynamic sensor connection callbacks.
`void` | `registerDynamicSensorCallback(SensorManager.DynamicSensorCallback callback, Handler handler)` Add a `DynamicSensorCallback` to receive dynamic sensor connection callbacks.
`boolean` | `registerListener(SensorEventListener listener, Sensor sensor, int samplingPeriodUs)` Registers a `SensorEventListener` for the given sensor at the given sampling frequency.
`boolean` | `registerListener(SensorEventListener listener, Sensor sensor, int samplingPeriodUs, int maxReportLatencyUs)` Registers a `SensorEventListener` for the given sensor at the given sampling frequency and the given maximum reporting latency.
`boolean` | `registerListener(SensorEventListener listener, Sensor sensor, int samplingPeriodUs, Handler handler)` Registers a `SensorEventListener` for the given sensor.
`boolean` | `registerListener(SensorListener listener, int sensors)` This method is deprecated. This method is deprecated, use `SensorManager#registerListener(SensorEventListener, Sensor, int)` instead.
`boolean` | `registerListener(SensorListener listener, int sensors, int rate)` This method is deprecated. This method is deprecated, use `SensorManager#registerListener(SensorEventListener, Sensor, int)` instead.
`boolean` | `registerListener(SensorEventListener listener, Sensor sensor, int samplingPeriodUs, int maxReportLatencyUs, Handler handler)` Registers a `SensorEventListener` for the given sensor at the given sampling frequency and the given maximum reporting latency.
`static boolean` | `remapCoordinateSystem(float[] inR, int X, int Y, float[] outR)` Rotates the supplied rotation matrix so it is expressed in a different coordinate system.
`boolean` | `requestTriggerSensor(TriggerEventListener listener, Sensor sensor)` Requests receiving trigger events for a trigger sensor.
`void` | `unregisterDynamicSensorCallback(SensorManager.DynamicSensorCallback callback)` Remove a `DynamicSensorCallback` to stop sending dynamic sensor connection events to that callback.
`void` | `unregisterListener(SensorEventListener listener)` Unregisters a listener for all sensors.
`void` | `unregisterListener(SensorEventListener listener, Sensor sensor)` Unregisters a listener for the sensors with which it is registered.
`void` | `unregisterListener(SensorListener listener)` This method is deprecated. This method is deprecated, use `SensorManager#unregisterListener(SensorEventListener)` instead.
`void` | `unregisterListener(SensorListener listener, int sensors)` This method is deprecated. This method is deprecated, use `SensorManager#unregisterListener(SensorEventListener, Sensor)` instead.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Constants

### AXIS_MINUS_X

    public static final int AXIS_MINUS_X

see `remapCoordinateSystem(float[], int, int, float[])`

Constant Value: 129 (0x00000081)

### AXIS_MINUS_Y

    public static final int AXIS_MINUS_Y

see `remapCoordinateSystem(float[], int, int, float[])`

Constant Value: 130 (0x00000082)

### AXIS_MINUS_Z

    public static final int AXIS_MINUS_Z

see `remapCoordinateSystem(float[], int, int, float[])`

Constant Value: 131 (0x00000083)

### AXIS_X

    public static final int AXIS_X

see `remapCoordinateSystem(float[], int, int, float[])`

Constant Value: 1 (0x00000001)

### AXIS_Y

    public static final int AXIS_Y

see `remapCoordinateSystem(float[], int, int, float[])`

Constant Value: 2 (0x00000002)

### AXIS_Z

    public static final int AXIS_Z

see `remapCoordinateSystem(float[], int, int, float[])`

Constant Value: 3 (0x00000003)

### DATA_X

    public static final int DATA_X

This constant is deprecated.
use `Sensor` instead.

Index of the X value in the array returned by `SensorListener.onSensorChanged(int, float[])`

Constant Value: 0 (0x00000000)

### DATA_Y

    public static final int DATA_Y

This constant is deprecated.
use `Sensor` instead.

Index of the Y value in the array returned by `SensorListener.onSensorChanged(int, float[])`

Constant Value: 1 (0x00000001)

### DATA_Z

    public static final int DATA_Z

This constant is deprecated.
use `Sensor` instead.

Index of the Z value in the array returned by `SensorListener.onSensorChanged(int, float[])`

Constant Value: 2 (0x00000002)

### GRAVITY_DEATH_STAR_I

    public static final float GRAVITY_DEATH_STAR_I

Gravity (estimate) on the first Death Star in Empire units (m/s^2)

Constant Value: 3.5303614E-7

### GRAVITY_EARTH

    public static final float GRAVITY_EARTH

Earth's gravity in SI units (m/s^2)

Constant Value: 9.80665

### GRAVITY_JUPITER

    public static final float GRAVITY_JUPITER

Jupiter's gravity in SI units (m/s^2)

Constant Value: 23.12

### GRAVITY_MARS

    public static final float GRAVITY_MARS

Mars' gravity in SI units (m/s^2)

Constant Value: 3.71

### GRAVITY_MERCURY

    public static final float GRAVITY_MERCURY

Mercury's gravity in SI units (m/s^2)

Constant Value: 3.7

### GRAVITY_MOON

    public static final float GRAVITY_MOON

The Moon's gravity in SI units (m/s^2)

Constant Value: 1.6

### GRAVITY_NEPTUNE

    public static final float GRAVITY_NEPTUNE

Neptune's gravity in SI units (m/s^2)

Constant Value: 11.0

### GRAVITY_PLUTO

    public static final float GRAVITY_PLUTO

Pluto's gravity in SI units (m/s^2)

Constant Value: 0.6

### GRAVITY_SATURN

    public static final float GRAVITY_SATURN

Saturn's gravity in SI units (m/s^2)

Constant Value: 8.96

### GRAVITY_SUN

    public static final float GRAVITY_SUN

Sun's gravity in SI units (m/s^2)

Constant Value: 275.0

### GRAVITY_THE_ISLAND

    public static final float GRAVITY_THE_ISLAND

Gravity on the island

Constant Value: 4.815162

### GRAVITY_URANUS

    public static final float GRAVITY_URANUS

Uranus' gravity in SI units (m/s^2)

Constant Value: 8.69

### GRAVITY_VENUS

    public static final float GRAVITY_VENUS

Venus' gravity in SI units (m/s^2)

Constant Value: 8.87

### LIGHT_CLOUDY

    public static final float LIGHT_CLOUDY

luminance under a cloudy sky in lux

Constant Value: 100.0

### LIGHT_FULLMOON

    public static final float LIGHT_FULLMOON

luminance at night with full moon in lux

Constant Value: 0.25

### LIGHT_NO_MOON

    public static final float LIGHT_NO_MOON

luminance at night with no moon in lux

Constant Value: 0.001

### LIGHT_OVERCAST

    public static final float LIGHT_OVERCAST

luminance under an overcast sky in lux

Constant Value: 10000.0

### LIGHT_SHADE

    public static final float LIGHT_SHADE

luminance in shade in lux

Constant Value: 20000.0

### LIGHT_SUNLIGHT

    public static final float LIGHT_SUNLIGHT

luminance of sunlight in lux

Constant Value: 110000.0

### LIGHT_SUNLIGHT_MAX

    public static final float LIGHT_SUNLIGHT_MAX

Maximum luminance of sunlight in lux

Constant Value: 120000.0

### LIGHT_SUNRISE

    public static final float LIGHT_SUNRISE

luminance at sunrise in lux

Constant Value: 400.0

### MAGNETIC_FIELD_EARTH_MAX

    public static final float MAGNETIC_FIELD_EARTH_MAX

Maximum magnetic field on Earth's surface

Constant Value: 60.0

### MAGNETIC_FIELD_EARTH_MIN

    public static final float MAGNETIC_FIELD_EARTH_MIN

Minimum magnetic field on Earth's surface

Constant Value: 30.0

### PRESSURE_STANDARD_ATMOSPHERE

    public static final float PRESSURE_STANDARD_ATMOSPHERE

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

Constant Value: 1013.25

### RAW_DATA_INDEX

    public static final int RAW_DATA_INDEX

This constant is deprecated.
use `Sensor` instead.

Offset to the untransformed values in the array returned by `SensorListener.onSensorChanged(int, float[])`

Constant Value: 3 (0x00000003)

### RAW_DATA_X

    public static final int RAW_DATA_X

This constant is deprecated.
use `Sensor` instead.

Index of the untransformed X value in the array returned by `SensorListener.onSensorChanged(int, float[])`

Constant Value: 3 (0x00000003)

### RAW_DATA_Y

    public static final int RAW_DATA_Y

This constant is deprecated.
use `Sensor` instead.

Index of the untransformed Y value in the array returned by `SensorListener.onSensorChanged(int, float[])`

Constant Value: 4 (0x00000004)

### RAW_DATA_Z

    public static final int RAW_DATA_Z

This constant is deprecated.
use `Sensor` instead.

Index of the untransformed Z value in the array returned by `SensorListener.onSensorChanged(int, float[])`

Constant Value: 5 (0x00000005)

### SENSOR_ACCELEROMETER

    public static final int SENSOR_ACCELEROMETER

This constant is deprecated.
use `Sensor` instead.

A constant describing an accelerometer. See `SensorListener` for more details.

Constant Value: 2 (0x00000002)

### SENSOR_ALL

    public static final int SENSOR_ALL

This constant is deprecated.
use `Sensor` instead.

A constant that includes all sensors

Constant Value: 127 (0x0000007f)

### SENSOR_DELAY_FASTEST

    public static final int SENSOR_DELAY_FASTEST

get sensor data as fast as possible

Constant Value: 0 (0x00000000)

### SENSOR_DELAY_GAME

    public static final int SENSOR_DELAY_GAME

rate suitable for games

Constant Value: 1 (0x00000001)

### SENSOR_DELAY_NORMAL

    public static final int SENSOR_DELAY_NORMAL

rate (default) suitable for screen orientation changes

Constant Value: 3 (0x00000003)

### SENSOR_DELAY_UI

    public static final int SENSOR_DELAY_UI

rate suitable for the user interface

Constant Value: 2 (0x00000002)

### SENSOR_LIGHT

    public static final int SENSOR_LIGHT

This constant is deprecated.
use `Sensor` instead.

A constant describing an ambient light sensor See `SensorListener` for more details.

Constant Value: 16 (0x00000010)

### SENSOR_MAGNETIC_FIELD

    public static final int SENSOR_MAGNETIC_FIELD

This constant is deprecated.
use `Sensor` instead.

A constant describing a magnetic sensor See `SensorListener` for more details.

Constant Value: 8 (0x00000008)

### SENSOR_MAX

    public static final int SENSOR_MAX

This constant is deprecated.
use `Sensor` instead.

Largest sensor ID

Constant Value: 64 (0x00000040)

### SENSOR_MIN

    public static final int SENSOR_MIN

This constant is deprecated.
use `Sensor` instead.

Smallest sensor ID

Constant Value: 1 (0x00000001)

### SENSOR_ORIENTATION

    public static final int SENSOR_ORIENTATION

This constant is deprecated.
use `Sensor` instead.

A constant describing an orientation sensor. See `SensorListener` for more details.

Constant Value: 1 (0x00000001)

### SENSOR_ORIENTATION_RAW

    public static final int SENSOR_ORIENTATION_RAW

This constant is deprecated.
use `Sensor` instead.

A constant describing an orientation sensor. See `SensorListener` for more details.

Constant Value: 128 (0x00000080)

### SENSOR_PROXIMITY

    public static final int SENSOR_PROXIMITY

This constant is deprecated.
use `Sensor` instead.

A constant describing a proximity sensor See `SensorListener` for more details.

Constant Value: 32 (0x00000020)

### SENSOR_STATUS_ACCURACY_HIGH

    public static final int SENSOR_STATUS_ACCURACY_HIGH

This sensor is reporting data with maximum accuracy

Constant Value: 3 (0x00000003)

### SENSOR_STATUS_ACCURACY_LOW

    public static final int SENSOR_STATUS_ACCURACY_LOW

This sensor is reporting data with low accuracy, calibration with the environment is needed

Constant Value: 1 (0x00000001)

### SENSOR_STATUS_ACCURACY_MEDIUM

    public static final int SENSOR_STATUS_ACCURACY_MEDIUM

This sensor is reporting data with an average level of accuracy, calibration with the environment may improve the readings

Constant Value: 2 (0x00000002)

### SENSOR_STATUS_NO_CONTACT

    public static final int SENSOR_STATUS_NO_CONTACT

The values returned by this sensor cannot be trusted because the sensor had no contact with what it was measuring (for example, the heart rate monitor is not in contact with the user).

Constant Value: -1 (0xffffffff)

### SENSOR_STATUS_UNRELIABLE

    public static final int SENSOR_STATUS_UNRELIABLE

The values returned by this sensor cannot be trusted, calibration is needed or the environment doesn't allow readings

Constant Value: 0 (0x00000000)

### SENSOR_TEMPERATURE

    public static final int SENSOR_TEMPERATURE

This constant is deprecated.
use `Sensor` instead.

A constant describing a temperature sensor See `SensorListener` for more details.

Constant Value: 4 (0x00000004)

### SENSOR_TRICORDER

    public static final int SENSOR_TRICORDER

This constant is deprecated.
use `Sensor` instead.

A constant describing a Tricorder See `SensorListener` for more details.

Constant Value: 64 (0x00000040)

### STANDARD_GRAVITY

    public static final float STANDARD_GRAVITY

Standard gravity (g) on Earth. This value is equivalent to 1G

Constant Value: 9.80665

## Public methods

### cancelTriggerSensor

    public boolean cancelTriggerSensor (TriggerEventListener listener,
                    Sensor sensor)

Cancels receiving trigger events for a trigger sensor.

Note that a Trigger sensor will be auto disabled if `TriggerEventListener#onTrigger(TriggerEvent)` has triggered. This method is provided in case the user wants to explicitly cancel the request to receive trigger events.

Parameters
`listener` | `TriggerEventListener`: The listener on which the `TriggerEventListener#onTrigger(TriggerEvent)` is delivered.It should be the same as the one used in `requestTriggerSensor(android.hardware.TriggerEventListener, android.hardware.Sensor)`
`sensor` | `Sensor`: The sensor for which the trigger request should be canceled. If null, it cancels receiving trigger for all sensors associated with the listener.

Returns
`boolean` | true if successfully canceled.

Throws
`IllegalArgumentException` | when sensor is a trigger sensor.

### createDirectChannel

    public SensorDirectChannel createDirectChannel (MemoryFile mem)

Create a sensor direct channel backed by shared memory wrapped in MemoryFile object. The resulting channel can be used for delivering sensor events to native code, other processes, GPU/DSP or other co-processors without CPU intervention. This is the recommanded for high performance sensor applications that use high sensor rates (e.g. greater than 200Hz) and cares about sensor event latency. Use the returned `SensorDirectChannel` object to configure direct report of sensor events. After use, call `SensorDirectChannel.close()` to free up resource in sensor system associated with the direct channel.

Parameters
`mem` | `MemoryFile`: A `MemoryFile` shared memory object.

Returns
`SensorDirectChannel` | A `SensorDirectChannel` object.

Throws
`NullPointerException` | when mem is null.
`` | if not able to create channel.

See also:

- `SensorDirectChannel.close()`

### createDirectChannel

    public SensorDirectChannel createDirectChannel (HardwareBuffer mem)

Create a sensor direct channel backed by shared memory wrapped in HardwareBuffer object. The resulting channel can be used for delivering sensor events to native code, other processes, GPU/DSP or other co-processors without CPU intervention. This is the recommanded for high performance sensor applications that use high sensor rates (e.g. greater than 200Hz) and cares about sensor event latency. Use the returned `SensorDirectChannel` object to configure direct report of sensor events. After use, call `SensorDirectChannel.close()` to free up resource in sensor system associated with the direct channel.

Parameters
`mem` | `HardwareBuffer`: A `HardwareBuffer` shared memory object.

Returns
`SensorDirectChannel` | A `SensorDirectChannel` object.

Throws
`NullPointerException` | when mem is null.
`` | if not able to create channel.

See also:

- `SensorDirectChannel.close()`

### flush

    public boolean flush (SensorEventListener listener)

Flushes the FIFO of all the sensors registered for this listener. If there are events in the FIFO of the sensor, they are returned as if the maxReportLantecy of the FIFO has expired. Events are returned in the usual way through the SensorEventListener. This call doesn't affect the maxReportLantecy for this sensor. This call is asynchronous and returns immediately. `onFlushCompleted` is called after all the events in the batch at the time of calling this method have been delivered successfully. If the hardware doesn't support flush, it still returns true and a trivial flush complete event is sent after the current event for all the clients registered for this sensor.

Parameters
`listener` | `SensorEventListener`: A `SensorEventListener` object which was previously used in a registerListener call.

Returns
`boolean` | `true` if the flush is initiated successfully on all the sensors registered for this listener, false if no sensor is previously registered for this listener or flush on one of the sensors fails.

Throws
`IllegalArgumentException` | when listener is null.

See also:

- `registerListener(SensorEventListener, Sensor, int, int)`

### getAltitude

    public static float getAltitude (float p0,
                    float p)

Computes the Altitude in meters from the atmospheric pressure and the pressure at sea level.

Typically the atmospheric pressure is read from a `Sensor#TYPE_PRESSURE` sensor. The pressure at sea level must be known, usually it can be retrieved from airport databases in the vicinity. If unknown, you can use `PRESSURE_STANDARD_ATMOSPHERE` as an approximation, but absolute altitudes won't be accurate.

To calculate altitude differences, you must calculate the difference between the altitudes at both points. If you don't know the altitude as sea level, you can use `PRESSURE_STANDARD_ATMOSPHERE` instead, which will give good results considering the range of pressure typically involved.

``

float altitude_difference = getAltitude(SensorManager.PRESSURE_STANDARD_ATMOSPHERE, pressure_at_point2) - getAltitude(SensorManager.PRESSURE_STANDARD_ATMOSPHERE, pressure_at_point1);

Parameters
`p0` | `float`: pressure at sea level
`p` | `float`: atmospheric pressure

Returns
`float` | Altitude in meters

### getAngleChange

    public static void getAngleChange (float[] angleChange,
                    float[] R,
                    float[] prevR)

Helper function to compute the angle change between two rotation matrices. Given a current rotation matrix (R) and a previous rotation matrix (prevR) computes the intrinsic rotation around the z, x, and y axes which transforms prevR to R. outputs a 3 element vector containing the z, x, and y angle change at indexes 0, 1, and 2 respectively.

Each input matrix is either as a 3x3 or 4x4 row-major matrix depending on the length of the passed array:

If the array length is 9, then the array elements represent this matrix

       /  R[ 0]   R[ 1]   R[ 2]   \
       |  R[ 3]   R[ 4]   R[ 5]   |
       \  R[ 6]   R[ 7]   R[ 8]   /

If the array length is 16, then the array elements represent this matrix

       /  R[ 0]   R[ 1]   R[ 2]   R[ 3]  \
       |  R[ 4]   R[ 5]   R[ 6]   R[ 7]  |
       |  R[ 8]   R[ 9]   R[10]   R[11]  |
       \  R[12]   R[13]   R[14]   R[15]  /

See `getOrientation(float[], float[])` for more detailed definition of the output.

Parameters
`angleChange` | `float`: an an array of floats (z, x, and y) in which the angle change (in radians) is stored
`R` | `float`: current rotation matrix
`prevR` | `float`: previous rotation matrix

### getDefaultSensor

    public Sensor getDefaultSensor (int type)

Use this method to get the default sensor for a given type. Note that the returned sensor could be a composite sensor, and its data could be averaged or filtered. If you need to access the raw sensors use `getSensorList`.

Parameters
`type` | `int`: of sensors requested

Returns
`Sensor` | the default sensor matching the requested type if one exists and the application has the necessary permissions, or null otherwise.

See also:

- `getSensorList(int)`
- `Sensor`

### getDefaultSensor

    public Sensor getDefaultSensor (int type,
                    boolean wakeUp)

Return a Sensor with the given type and wakeUp properties. If multiple sensors of this type exist, any one of them may be returned.

For example,

- getDefaultSensor(`Sensor#TYPE_ACCELEROMETER`, true) returns a wake-up accelerometer sensor if it exists.
- getDefaultSensor(`Sensor#TYPE_PROXIMITY`, false) returns a non wake-up proximity sensor if it exists.
- getDefaultSensor(`Sensor#TYPE_PROXIMITY`, true) returns a wake-up proximity sensor which is the same as the Sensor returned by `getDefaultSensor(int)`.

Note: Sensors like `Sensor#TYPE_PROXIMITY` and `Sensor#TYPE_SIGNIFICANT_MOTION` are declared as wake-up sensors by default.

Parameters
`type` | `int`: type of sensor requested
`wakeUp` | `boolean`: flag to indicate whether the Sensor is a wake-up or non wake-up sensor.

Returns
`Sensor` | the default sensor matching the requested type and wakeUp properties if one exists and the application has the necessary permissions, or null otherwise.

See also:

- `Sensor.isWakeUpSensor()`

### getDynamicSensorList

    public List<Sensor> getDynamicSensorList (int type)

Use this method to get a list of available dynamic sensors of a certain type. Make multiple calls to get sensors of different types or use `Sensor.TYPE_ALL` to get all dynamic sensors.

NOTE: Both wake-up and non wake-up sensors matching the given type are returned. Check `Sensor#isWakeUpSensor()` to know the wake-up properties of the returned `Sensor`.

Parameters
`type` | `int`: of sensors requested

Returns
`List<Sensor>` | a list of dynamic sensors matching the requested type.

See also:

- `Sensor`

### getInclination

    public static float getInclination (float[] I)

Computes the geomagnetic inclination angle in radians from the inclination matrix I returned by `getRotationMatrix(float[], float[], float[], float[])`.

Parameters
`I` | `float`: inclination matrix see `getRotationMatrix(float[], float[], float[], float[])`.

Returns
`float` | The geomagnetic inclination angle in radians.

See also:

- `getRotationMatrix(float[], float[], float[], float[])`
- `getOrientation(float[], float[])`
- `GeomagneticField`

### getOrientation

    public static float[] getOrientation (float[] R,
                    float[] values)

Computes the device's orientation based on the rotation matrix.

When it returns, the array values are as follows:

- values[0]: Azimuth, angle of rotation about the -z axis. This value represents the angle between the device's y axis and the magnetic north pole. When facing north, this angle is 0, when facing south, this angle is π. Likewise, when facing east, this angle is π/2, and when facing west, this angle is -π/2. The range of values is -π to π.
- values[1]: Pitch, angle of rotation about the x axis. This value represents the angle between a plane parallel to the device's screen and a plane parallel to the ground. Assuming that the bottom edge of the device faces the user and that the screen is face-up, tilting the top edge of the device toward the ground creates a positive pitch angle. The range of values is -π to π.
- values[2]: Roll, angle of rotation about the y axis. This value represents the angle between a plane perpendicular to the device's screen and a plane perpendicular to the ground. Assuming that the bottom edge of the device faces the user and that the screen is face-up, tilting the left edge of the device toward the ground creates a positive roll angle. The range of values is -π/2 to π/2.

Applying these three rotations in the azimuth, pitch, roll order transforms an identity matrix to the rotation matrix passed into this method. Also, note that all three orientation angles are expressed in radians.

Parameters
`R` | `float`: rotation matrix see `getRotationMatrix(float[], float[], float[], float[])`.
`values` | `float`: an array of 3 floats to hold the result.

Returns
`float[]` | The array values passed as argument.

See also:

- `getRotationMatrix(float[], float[], float[], float[])`
- `GeomagneticField`

### getQuaternionFromVector

    public static void getQuaternionFromVector (float[] Q,
                    float[] rv)

Helper function to convert a rotation vector to a normalized quaternion. Given a rotation vector (presumably from a ROTATION_VECTOR sensor), returns a normalized quaternion in the array Q. The quaternion is stored as [w, x, y, z]

Parameters
`Q` | `float`: an array of floats in which to store the computed quaternion
`rv` | `float`: the rotation vector to convert

### getRotationMatrix

    public static boolean getRotationMatrix (float[] R,
                    float[] I,
                    float[] gravity,
                    float[] geomagnetic)

Computes the inclination matrix I as well as the rotation matrix R transforming a vector from the device coordinate system to the world's coordinate system which is defined as a direct orthonormal basis, where:

- X is defined as the vector product Y.Z (It is tangential to the ground at the device's current location and roughly points East).
- Y is tangential to the ground at the device's current location and points towards the magnetic North Pole.
- Z points towards the sky and is perpendicular to the ground.

By definition:

[0 0 g] = R * gravity (g = magnitude of gravity)

[0 m 0] = I * R * geomagnetic (m = magnitude of geomagnetic field)

R is the identity matrix when the device is aligned with the world's coordinate system, that is, when the device's X axis points toward East, the Y axis points to the North Pole and the device is facing the sky.

I is a rotation matrix transforming the geomagnetic vector into the same coordinate space as gravity (the world's coordinate space). I is a simple rotation around the X axis. The inclination angle in radians can be computed with `getInclination(float[])`.

Each matrix is returned either as a 3x3 or 4x4 row-major matrix depending on the length of the passed array:

If the array length is 16:

       /  M[ 0]   M[ 1]   M[ 2]   M[ 3]  \
       |  M[ 4]   M[ 5]   M[ 6]   M[ 7]  |
       |  M[ 8]   M[ 9]   M[10]   M[11]  |
       \  M[12]   M[13]   M[14]   M[15]  /

This matrix is ready to be used by OpenGL ES's `glLoadMatrixf(float[], int)`.

Note that because OpenGL matrices are column-major matrices you must transpose the matrix before using it. However, since the matrix is a rotation matrix, its transpose is also its inverse, conveniently, it is often the inverse of the rotation that is needed for rendering; it can therefore be used with OpenGL ES directly.

Also note that the returned matrices always have this form:

       /  M[ 0]   M[ 1]   M[ 2]   0  \
       |  M[ 4]   M[ 5]   M[ 6]   0  |
       |  M[ 8]   M[ 9]   M[10]   0  |
       \      0       0       0   1  /

If the array length is 9:

       /  M[ 0]   M[ 1]   M[ 2]  \
       |  M[ 3]   M[ 4]   M[ 5]  |
       \  M[ 6]   M[ 7]   M[ 8]  /

The inverse of each matrix can be computed easily by taking its transpose.

The matrices returned by this function are meaningful only when the device is not free-falling and it is not close to the magnetic north. If the device is accelerating, or placed into a strong magnetic field, the returned matrices may be inaccurate.

Parameters
`R` | `float`: is an array of 9 floats holding the rotation matrix R when this function returns. R can be null.
`I` | `float`: is an array of 9 floats holding the rotation matrix I when this function returns. I can be null.
`gravity` | `float`: is an array of 3 floats containing the gravity vector expressed in the device's coordinate. You can simply use the `values` returned by a `SensorEvent` of a `Sensor` of type `TYPE_ACCELEROMETER`.
`geomagnetic` | `float`: is an array of 3 floats containing the geomagnetic vector expressed in the device's coordinate. You can simply use the `values` returned by a `SensorEvent` of a `Sensor` of type `TYPE_MAGNETIC_FIELD`.

Returns
`boolean` | `true` on success, `false` on failure (for instance, if the device is in free fall). Free fall is defined as condition when the magnitude of the gravity is less than 1/10 of the nominal value. On failure the output matrices are not modified.

See also:

- `getInclination(float[])`
- `getOrientation(float[], float[])`
- `remapCoordinateSystem(float[], int, int, float[])`

### getRotationMatrixFromVector

    public static void getRotationMatrixFromVector (float[] R,
                    float[] rotationVector)

Helper function to convert a rotation vector to a rotation matrix. Given a rotation vector (presumably from a ROTATION_VECTOR sensor), returns a 9 or 16 element rotation matrix in the array R. R must have length 9 or 16. If R.length == 9, the following matrix is returned:

       /  R[ 0]   R[ 1]   R[ 2]   \
       |  R[ 3]   R[ 4]   R[ 5]   |
       \  R[ 6]   R[ 7]   R[ 8]   /

If R.length == 16, the following matrix is returned:

       /  R[ 0]   R[ 1]   R[ 2]   0  \
       |  R[ 4]   R[ 5]   R[ 6]   0  |
       |  R[ 8]   R[ 9]   R[10]   0  |
       \  0       0       0       1  /

Parameters
`R` | `float`: an array of floats in which to store the rotation matrix
`rotationVector` | `float`: the rotation vector to convert

### getSensorList

    public List<Sensor> getSensorList (int type)

Use this method to get the list of available sensors of a certain type. Make multiple calls to get sensors of different types or use `Sensor.TYPE_ALL` to get all the sensors. Note that the `Sensor.getName()` is expected to yield a value that is unique across any sensors that return the same value for `Sensor.getType()`.

NOTE: Both wake-up and non wake-up sensors matching the given type are returned. Check `Sensor#isWakeUpSensor()` to know the wake-up properties of the returned `Sensor`.

Parameters
`type` | `int`: of sensors requested

Returns
`List<Sensor>` | a list of sensors matching the asked type.

See also:

- `getDefaultSensor(int)`
- `Sensor`

### getSensors

    public int getSensors ()

This method is deprecated.
This method is deprecated, use `SensorManager#getSensorList(int)` instead

Returns
`int` | available sensors.

### isDynamicSensorDiscoverySupported

    public boolean isDynamicSensorDiscoverySupported ()

Tell if dynamic sensor discovery feature is supported by system.

Returns
`boolean` | `true` if dynamic sensor discovery is supported, `false` otherwise.

### registerDynamicSensorCallback

    public void registerDynamicSensorCallback (SensorManager.DynamicSensorCallback callback)

Add a `DynamicSensorCallback` to receive dynamic sensor connection callbacks. Repeat registration with the already registered callback object will have no additional effect.

Parameters
`callback` | `SensorManager.DynamicSensorCallback`: An object that implements the `DynamicSensorCallback` interface for receiving callbacks.

Throws
`IllegalArgumentException` | when callback is null.

See also:

- `registerDynamicSensorCallback(DynamicSensorCallback, Handler)`

### registerDynamicSensorCallback

    public void registerDynamicSensorCallback (SensorManager.DynamicSensorCallback callback,
                    Handler handler)

Add a `DynamicSensorCallback` to receive dynamic sensor connection callbacks. Repeat registration with the already registered callback object will have no additional effect.

Parameters
`callback` | `SensorManager.DynamicSensorCallback`: An object that implements the `DynamicSensorCallback` interface for receiving callbacks.
`handler` | `Handler`: The `Handler` the `sensor connection events` will be delivered to.

Throws
`IllegalArgumentException` | when callback is null.

### registerListener

    public boolean registerListener (SensorEventListener listener,
                    Sensor sensor,
                    int samplingPeriodUs)

Registers a `SensorEventListener` for the given sensor at the given sampling frequency.

The events will be delivered to the provided `SensorEventListener` as soon as they are available. To reduce the power consumption, applications can use `registerListener(android.hardware.SensorEventListener, android.hardware.Sensor, int, int)` instead and specify a positive non-zero maximum reporting latency.

In the case of non-wake-up sensors, the events are only delivered while the Application Processor (AP) is not in suspend mode. See `Sensor#isWakeUpSensor()` for more details. To ensure delivery of events from non-wake-up sensors even when the screen is OFF, the application registering to the sensor must hold a partial wake-lock to keep the AP awake, otherwise some events might be lost while the AP is asleep. Note that although events might be lost while the AP is asleep, the sensor will still consume power if it is not explicitly deactivated by the application. Applications must unregister their `SensorEventListener`s in their activity's `onPause()` method to avoid consuming power while the device is inactive. See `registerListener(android.hardware.SensorEventListener, android.hardware.Sensor, int, int)` for more details on hardware FIFO (queueing) capabilities and when some sensor events might be lost.

In the case of wake-up sensors, each event generated by the sensor will cause the AP to wake-up, ensuring that each event can be delivered. Because of this, registering to a wake-up sensor has very significant power implications. Call `Sensor#isWakeUpSensor()` to check whether a sensor is a wake-up sensor. See `registerListener(android.hardware.SensorEventListener, android.hardware.Sensor, int, int)` for information on how to reduce the power impact of registering to wake-up sensors.

Note: Don't use this method with one-shot trigger sensors such as `Sensor#TYPE_SIGNIFICANT_MOTION`. Use `requestTriggerSensor(android.hardware.TriggerEventListener, android.hardware.Sensor)` instead. Use `Sensor#getReportingMode()` to obtain the reporting mode of a given sensor.

Parameters
`listener` | `SensorEventListener`: A `SensorEventListener` object.
`sensor` | `Sensor`: The `Sensor` to register to.
`samplingPeriodUs` | `int`: The rate `sensor events` are delivered at. This is only a hint to the system. Events may be received faster or slower than the specified rate. Usually events are received faster. The value must be one of `SENSOR_DELAY_NORMAL`, `SENSOR_DELAY_UI`, `SENSOR_DELAY_GAME`, or `SENSOR_DELAY_FASTEST` or, the desired delay between events in microseconds. Specifying the delay in microseconds only works from Android 2.3 (API level 9) onwards. For earlier releases, you must use one of the `SENSOR_DELAY_*` constants.

Returns
`boolean` | `true` if the sensor is supported and successfully enabled.

See also:

- `registerListener(SensorEventListener, Sensor, int, Handler)`
- `unregisterListener(SensorEventListener)`
- `unregisterListener(SensorEventListener, Sensor)`

### registerListener

    public boolean registerListener (SensorEventListener listener,
                    Sensor sensor,
                    int samplingPeriodUs,
                    int maxReportLatencyUs)

Registers a `SensorEventListener` for the given sensor at the given sampling frequency and the given maximum reporting latency.

This function is similar to `registerListener(android.hardware.SensorEventListener, android.hardware.Sensor, int)` but it allows events to stay temporarily in the hardware FIFO (queue) before being delivered. The events can be stored in the hardware FIFO up to `maxReportLatencyUs` microseconds. Once one of the events in the FIFO needs to be reported, all of the events in the FIFO are reported sequentially. This means that some events will be reported before the maximum reporting latency has elapsed.

When `maxReportLatencyUs` is 0, the call is equivalent to a call to `registerListener(android.hardware.SensorEventListener, android.hardware.Sensor, int)`, as it requires the events to be delivered as soon as possible.

When `sensor.maxFifoEventCount()` is 0, the sensor does not use a FIFO, so the call will also be equivalent to `registerListener(android.hardware.SensorEventListener, android.hardware.Sensor, int)`.

Setting `maxReportLatencyUs` to a positive value allows to reduce the number of interrupts the AP (Application Processor) receives, hence reducing power consumption, as the AP can switch to a lower power state while the sensor is capturing the data. This is especially important when registering to wake-up sensors, for which each interrupt causes the AP to wake up if it was in suspend mode. See `Sensor#isWakeUpSensor()` for more information on wake-up sensors.

Note: Don't use this method with one-shot trigger sensors such as `Sensor#TYPE_SIGNIFICANT_MOTION`. Use `requestTriggerSensor(android.hardware.TriggerEventListener, android.hardware.Sensor)` instead.

Parameters
`listener` | `SensorEventListener`: A `SensorEventListener` object that will receive the sensor events. If the application is interested in receiving flush complete notifications, it should register with `SensorEventListener2` instead.
`sensor` | `Sensor`: The `Sensor` to register to.
`samplingPeriodUs` | `int`: The desired delay between two consecutive events in microseconds. This is only a hint to the system. Events may be received faster or slower than the specified rate. Usually events are received faster. Can be one of `SENSOR_DELAY_NORMAL`, `SENSOR_DELAY_UI`, `SENSOR_DELAY_GAME`, `SENSOR_DELAY_FASTEST` or the delay in microseconds.
`maxReportLatencyUs` | `int`: Maximum time in microseconds that events can be delayed before being reported to the application. A large value allows reducing the power consumption associated with the sensor. If maxReportLatencyUs is set to zero, events are delivered as soon as they are available, which is equivalent to calling `registerListener(android.hardware.SensorEventListener, android.hardware.Sensor, int)`.

Returns
`boolean` | `true` if the sensor is supported and successfully enabled.

See also:

- `registerListener(SensorEventListener, Sensor, int)`
- `unregisterListener(SensorEventListener)`
- `flush(SensorEventListener)`

### registerListener

    public boolean registerListener (SensorEventListener listener,
                    Sensor sensor,
                    int samplingPeriodUs,
                    Handler handler)

Registers a `SensorEventListener` for the given sensor. Events are delivered in continuous mode as soon as they are available. To reduce the power consumption, applications can use `registerListener(android.hardware.SensorEventListener, android.hardware.Sensor, int, int)` instead and specify a positive non-zero maximum reporting latency.

Note: Don't use this method with a one shot trigger sensor such as `Sensor#TYPE_SIGNIFICANT_MOTION`. Use `requestTriggerSensor(android.hardware.TriggerEventListener, android.hardware.Sensor)` instead.

Parameters
`listener` | `SensorEventListener`: A `SensorEventListener` object.
`sensor` | `Sensor`: The `Sensor` to register to.
`samplingPeriodUs` | `int`: The rate `sensor events` are delivered at. This is only a hint to the system. Events may be received faster or slower than the specified rate. Usually events are received faster. The value must be one of `SENSOR_DELAY_NORMAL`, `SENSOR_DELAY_UI`, `SENSOR_DELAY_GAME`, or `SENSOR_DELAY_FASTEST` or, the desired delay between events in microseconds. Specifying the delay in microseconds only works from Android 2.3 (API level 9) onwards. For earlier releases, you must use one of the `SENSOR_DELAY_*` constants.
`handler` | `Handler`: The `Handler` the `sensor events` will be delivered to.

Returns
`boolean` | `true` if the sensor is supported and successfully enabled.

See also:

- `registerListener(SensorEventListener, Sensor, int)`
- `unregisterListener(SensorEventListener)`
- `unregisterListener(SensorEventListener, Sensor)`

### registerListener

    public boolean registerListener (SensorListener listener,
                    int sensors)

This method is deprecated.
This method is deprecated, use `SensorManager#registerListener(SensorEventListener, Sensor, int)` instead.

Registers a listener for given sensors.

Parameters
`listener` | `SensorListener`: sensor listener object
`sensors` | `int`: a bit masks of the sensors to register to

Returns
`boolean` | `true` if the sensor is supported and successfully enabled

### registerListener

    public boolean registerListener (SensorListener listener,
                    int sensors,
                    int rate)

This method is deprecated.
This method is deprecated, use `SensorManager#registerListener(SensorEventListener, Sensor, int)` instead.

Registers a SensorListener for given sensors.

Parameters
`listener` | `SensorListener`: sensor listener object
`sensors` | `int`: a bit masks of the sensors to register to
`rate` | `int`: rate of events. This is only a hint to the system. events may be received faster or slower than the specified rate. Usually events are received faster. The value must be one of `SENSOR_DELAY_NORMAL`, `SENSOR_DELAY_UI`, `SENSOR_DELAY_GAME`, or `SENSOR_DELAY_FASTEST`.

Returns
`boolean` | `true` if the sensor is supported and successfully enabled

### registerListener

    public boolean registerListener (SensorEventListener listener,
                    Sensor sensor,
                    int samplingPeriodUs,
                    int maxReportLatencyUs,
                    Handler handler)

Registers a `SensorEventListener` for the given sensor at the given sampling frequency and the given maximum reporting latency.

Parameters
`listener` | `SensorEventListener`: A `SensorEventListener` object that will receive the sensor events. If the application is interested in receiving flush complete notifications, it should register with `SensorEventListener2` instead.
`sensor` | `Sensor`: The `Sensor` to register to.
`samplingPeriodUs` | `int`: The desired delay between two consecutive events in microseconds. This is only a hint to the system. Events may be received faster or slower than the specified rate. Usually events are received faster. Can be one of `SENSOR_DELAY_NORMAL`, `SENSOR_DELAY_UI`, `SENSOR_DELAY_GAME`, `SENSOR_DELAY_FASTEST` or the delay in microseconds.
`maxReportLatencyUs` | `int`: Maximum time in microseconds that events can be delayed before being reported to the application. A large value allows reducing the power consumption associated with the sensor. If maxReportLatencyUs is set to zero, events are delivered as soon as they are available, which is equivalent to calling `registerListener(android.hardware.SensorEventListener, android.hardware.Sensor, int)`.
`handler` | `Handler`: The `Handler` the `sensor events` will be delivered to.

Returns
`boolean` | `true` if the sensor is supported and successfully enabled.

See also:

- `registerListener(SensorEventListener, Sensor, int, int)`

### remapCoordinateSystem

    public static boolean remapCoordinateSystem (float[] inR,
                    int X,
                    int Y,
                    float[] outR)

Rotates the supplied rotation matrix so it is expressed in a different coordinate system. This is typically used when an application needs to compute the three orientation angles of the device (see `getOrientation(float[], float[])`) in a different coordinate system.

When the rotation matrix is used for drawing (for instance with OpenGL ES), it usually doesn't need to be transformed by this function, unless the screen is physically rotated, in which case you can use `Display.getRotation()` to retrieve the current rotation of the screen. Note that because the user is generally free to rotate their screen, you often should consider the rotation in deciding the parameters to use here.

Examples:

- Using the camera (Y axis along the camera's axis) for an augmented reality application where the rotation angles are needed:

`remapCoordinateSystem(inR, AXIS_X, AXIS_Z, outR);`

- Using the device as a mechanical compass when rotation is `Surface.ROTATION_90`:

`remapCoordinateSystem(inR, AXIS_Y, AXIS_MINUS_X, outR);`

Beware of the above example. This call is needed only to account for a rotation from its natural orientation when calculating the rotation angles (see `getOrientation(float[], float[])`). If the rotation matrix is also used for rendering, it may not need to be transformed, for instance if your `Activity` is running in landscape mode.

Since the resulting coordinate system is orthonormal, only two axes need to be specified.

Parameters
`inR` | `float`: the rotation matrix to be transformed. Usually it is the matrix returned by `getRotationMatrix(float[], float[], float[], float[])`.
`X` | `int`: defines the axis of the new cooridinate system that coincide with the X axis of the original coordinate system.
`Y` | `int`: defines the axis of the new cooridinate system that coincide with the Y axis of the original coordinate system.
`outR` | `float`: the transformed rotation matrix. inR and outR should not be the same array.

Returns
`boolean` | `true` on success. `false` if the input parameters are incorrect, for instance if X and Y define the same axis. Or if inR and outR don't have the same length.

See also:

- `getRotationMatrix(float[], float[], float[], float[])`

### requestTriggerSensor

    public boolean requestTriggerSensor (TriggerEventListener listener,
                    Sensor sensor)

Requests receiving trigger events for a trigger sensor.

When the sensor detects a trigger event condition, such as significant motion in the case of the `Sensor#TYPE_SIGNIFICANT_MOTION`, the provided trigger listener will be invoked once and then its request to receive trigger events will be canceled. To continue receiving trigger events, the application must request to receive trigger events again.

Parameters
`listener` | `TriggerEventListener`: The listener on which the `TriggerEventListener#onTrigger(TriggerEvent)` will be delivered.
`sensor` | `Sensor`: The sensor to be enabled.

Returns
`boolean` | true if the sensor was successfully enabled.

Throws
`IllegalArgumentException` | when sensor is null or not a trigger sensor.

### unregisterDynamicSensorCallback

    public void unregisterDynamicSensorCallback (SensorManager.DynamicSensorCallback callback)

Remove a `DynamicSensorCallback` to stop sending dynamic sensor connection events to that callback.

Parameters
`callback` | `SensorManager.DynamicSensorCallback`: An object that implements the `DynamicSensorCallback` interface for receiving callbacks.

### unregisterListener

    public void unregisterListener (SensorEventListener listener)

Unregisters a listener for all sensors.

Parameters
`listener` | `SensorEventListener`: a SensorListener object

See also:

- `unregisterListener(SensorEventListener, Sensor)`
- `registerListener(SensorEventListener, Sensor, int)`

### unregisterListener

    public void unregisterListener (SensorEventListener listener,
                    Sensor sensor)

Unregisters a listener for the sensors with which it is registered.

Note: Don't use this method with a one shot trigger sensor such as `Sensor#TYPE_SIGNIFICANT_MOTION`. Use `cancelTriggerSensor(android.hardware.TriggerEventListener, android.hardware.Sensor)` instead.

Parameters
`listener` | `SensorEventListener`: a SensorEventListener object
`sensor` | `Sensor`: the sensor to unregister from

See also:

- `unregisterListener(SensorEventListener)`
- `registerListener(SensorEventListener, Sensor, int)`

### unregisterListener

    public void unregisterListener (SensorListener listener)

This method is deprecated.
This method is deprecated, use `SensorManager#unregisterListener(SensorEventListener)` instead.

Unregisters a listener for all sensors.

Parameters
`listener` | `SensorListener`: a SensorListener object

### unregisterListener

    public void unregisterListener (SensorListener listener,
                    int sensors)

This method is deprecated.
This method is deprecated, use `SensorManager#unregisterListener(SensorEventListener, Sensor)` instead.

Unregisters a listener for the sensors with which it is registered.

Parameters
`listener` | `SensorListener`: a SensorListener object
`sensors` | `int`: a bit masks of the sensors to unregister from

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