/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.hardware;
import android.os.Build;
/**
* Class representing a sensor. Use {@link SensorManager#getSensorList} to get
* the list of available Sensors.
*
* @see SensorManager
* @see SensorEventListener
* @see SensorEvent
*
*/
public final class Sensor {
/**
* A constant describing an accelerometer sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
*/
public static final int TYPE_ACCELEROMETER = 1;
/**
* A constant string describing an accelerometer sensor type.
*
* @see #TYPE_ACCELEROMETER
*/
public static final String STRING_TYPE_ACCELEROMETER = "android.sensor.accelerometer";
/**
* A constant describing a magnetic field sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
*/
public static final int TYPE_MAGNETIC_FIELD = 2;
/**
* A constant string describing a magnetic field sensor type.
*
* @see #TYPE_MAGNETIC_FIELD
*/
public static final String STRING_TYPE_MAGNETIC_FIELD = "android.sensor.magnetic_field";
/**
* A constant describing an orientation sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
*
* @deprecated use {@link android.hardware.SensorManager#getOrientation
* SensorManager.getOrientation()} instead.
*/
@Deprecated
public static final int TYPE_ORIENTATION = 3;
/**
* A constant string describing an orientation sensor type.
*
* @see #TYPE_ORIENTATION
* @deprecated use {@link android.hardware.SensorManager#getOrientation
* SensorManager.getOrientation()} instead.
*/
@Deprecated
public static final String STRING_TYPE_ORIENTATION = "android.sensor.orientation";
/**
* A constant describing a gyroscope sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details. */
public static final int TYPE_GYROSCOPE = 4;
/**
* A constant string describing a gyroscope sensor type.
*
* @see #TYPE_GYROSCOPE
*/
public static final String STRING_TYPE_GYROSCOPE = "android.sensor.gyroscope";
/**
* A constant describing a light sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
*/
public static final int TYPE_LIGHT = 5;
/**
* A constant string describing a light sensor type.
*
* @see #TYPE_LIGHT
*/
public static final String STRING_TYPE_LIGHT = "android.sensor.light";
/**
* A constant describing a pressure sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
*/
public static final int TYPE_PRESSURE = 6;
/**
* A constant string describing a pressure sensor type.
*
* @see #TYPE_PRESSURE
*/
public static final String STRING_TYPE_PRESSURE = "android.sensor.pressure";
/**
* A constant describing a temperature sensor type
*
* @deprecated use
* {@link android.hardware.Sensor#TYPE_AMBIENT_TEMPERATURE
* Sensor.TYPE_AMBIENT_TEMPERATURE} instead.
*/
@Deprecated
public static final int TYPE_TEMPERATURE = 7;
/**
* A constant string describing a temperature sensor type
*
* @see #TYPE_TEMPERATURE
* @deprecated use
* {@link android.hardware.Sensor#STRING_TYPE_AMBIENT_TEMPERATURE
* Sensor.STRING_TYPE_AMBIENT_TEMPERATURE} instead.
*/
@Deprecated
public static final String STRING_TYPE_TEMPERATURE = "android.sensor.temperature";
/**
* A constant describing a proximity sensor type. This is a wake up sensor.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
* @see #isWakeUpSensor()
*/
public static final int TYPE_PROXIMITY = 8;
/**
* A constant string describing a proximity sensor type.
*
* @see #TYPE_PROXIMITY
*/
public static final String STRING_TYPE_PROXIMITY = "android.sensor.proximity";
/**
* A constant describing a gravity sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
*/
public static final int TYPE_GRAVITY = 9;
/**
* A constant string describing a gravity sensor type.
*
* @see #TYPE_GRAVITY
*/
public static final String STRING_TYPE_GRAVITY = "android.sensor.gravity";
/**
* A constant describing a linear acceleration sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
*/
public static final int TYPE_LINEAR_ACCELERATION = 10;
/**
* A constant string describing a linear acceleration sensor type.
*
* @see #TYPE_LINEAR_ACCELERATION
*/
public static final String STRING_TYPE_LINEAR_ACCELERATION =
"android.sensor.linear_acceleration";
/**
* A constant describing a rotation vector sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
*/
public static final int TYPE_ROTATION_VECTOR = 11;
/**
* A constant string describing a rotation vector sensor type.
*
* @see #TYPE_ROTATION_VECTOR
*/
public static final String STRING_TYPE_ROTATION_VECTOR = "android.sensor.rotation_vector";
/**
* A constant describing a relative humidity sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
*/
public static final int TYPE_RELATIVE_HUMIDITY = 12;
/**
* A constant string describing a relative humidity sensor type
*
* @see #TYPE_RELATIVE_HUMIDITY
*/
public static final String STRING_TYPE_RELATIVE_HUMIDITY = "android.sensor.relative_humidity";
/**
* A constant describing an ambient temperature sensor type.
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values}
* for more details.
*/
public static final int TYPE_AMBIENT_TEMPERATURE = 13;
/**
* A constant string describing an ambient temperature sensor type.
*
* @see #TYPE_AMBIENT_TEMPERATURE
*/
public static final String STRING_TYPE_AMBIENT_TEMPERATURE =
"android.sensor.ambient_temperature";
/**
* A constant describing an uncalibrated magnetic field sensor type.
* <p>
* Similar to {@link #TYPE_MAGNETIC_FIELD} but the hard iron calibration (device calibration
* due to distortions that arise from magnetized iron, steel or permanent magnets on the
* device) is not considered in the given sensor values. However, such hard iron bias values
* are returned to you separately in the result {@link android.hardware.SensorEvent#values}
* so you may use them for custom calibrations.
* <p>Also, no periodic calibration is performed
* (i.e. there are no discontinuities in the data stream while using this sensor) and
* assumptions that the magnetic field is due to the Earth's poles is avoided, but
* factory calibration and temperature compensation have been performed.
* </p>
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values} for more
* details.
*/
public static final int TYPE_MAGNETIC_FIELD_UNCALIBRATED = 14;
/**
* A constant string describing an uncalibrated magnetic field sensor type.
*
* @see #TYPE_MAGNETIC_FIELD_UNCALIBRATED
*/
public static final String STRING_TYPE_MAGNETIC_FIELD_UNCALIBRATED =
"android.sensor.magnetic_field_uncalibrated";
/**
* A constant describing an uncalibrated rotation vector sensor type.
* <p>Identical to {@link #TYPE_ROTATION_VECTOR} except that it doesn't
* use the geomagnetic field. Therefore the Y axis doesn't
* point north, but instead to some other reference, that reference is
* allowed to drift by the same order of magnitude as the gyroscope
* drift around the Z axis.
* <p>
* In the ideal case, a phone rotated and returning to the same real-world
* orientation should report the same game rotation vector
* (without using the earth's geomagnetic field). However, the orientation
* may drift somewhat over time.
* </p>
* <p>See {@link android.hardware.SensorEvent#values SensorEvent.values} for more
* details.
*/
public static final int TYPE_GAME_ROTATION_VECTOR = 15;
/**
* A constant string describing an uncalibrated rotation vector sensor type.
*
* @see #TYPE_GAME_ROTATION_VECTOR
*/
public static final String STRING_TYPE_GAME_ROTATION_VECTOR =
"android.sensor.game_rotation_vector";
/**
* A constant describing an uncalibrated gyroscope sensor type.
* <p>Similar to {@link #TYPE_GYROSCOPE} but no gyro-drift compensation has been performed
* to adjust the given sensor values. However, such gyro-drift bias values
* are returned to you separately in the result {@link android.hardware.SensorEvent#values}
* so you may use them for custom calibrations.
* <p>Factory calibration and temperature compensation is still applied
* to the rate of rotation (angular speeds).
* </p>
* <p> See {@link android.hardware.SensorEvent#values SensorEvent.values} for more
* details.
*/
public static final int TYPE_GYROSCOPE_UNCALIBRATED = 16;
/**
* A constant string describing an uncalibrated gyroscope sensor type.
*
* @see #TYPE_GYROSCOPE_UNCALIBRATED
*/
public static final String STRING_TYPE_GYROSCOPE_UNCALIBRATED =
"android.sensor.gyroscope_uncalibrated";
/**
* A constant describing a significant motion trigger sensor.
* <p>
* It triggers when an event occurs and then automatically disables
* itself. The sensor continues to operate while the device is asleep
* and will automatically wake the device to notify when significant
* motion is detected. The application does not need to hold any wake
* locks for this sensor to trigger. This is a wake up sensor.
* <p>See {@link TriggerEvent} for more details.
*
* @see #isWakeUpSensor()
*/
public static final int TYPE_SIGNIFICANT_MOTION = 17;
/**
* A constant string describing a significant motion trigger sensor.
*
* @see #TYPE_SIGNIFICANT_MOTION
*/
public static final String STRING_TYPE_SIGNIFICANT_MOTION =
"android.sensor.significant_motion";
/**
* A constant describing a step detector sensor.
* <p>
* A sensor of this type triggers an event each time a step is taken by the user. The only
* allowed value to return is 1.0 and an event is generated for each step. Like with any other
* event, the timestamp indicates when the event (here the step) occurred, this corresponds to
* when the foot hit the ground, generating a high variation in acceleration. This sensor is
* only for detecting every individual step as soon as it is taken, for example to perform dead
* reckoning. If you only need aggregate number of steps taken over a period of time, register
* for {@link #TYPE_STEP_COUNTER} instead. It is defined as a
* {@link Sensor#REPORTING_MODE_SPECIAL_TRIGGER} sensor.
* <p>
* See {@link android.hardware.SensorEvent#values SensorEvent.values} for more details.
*/
public static final int TYPE_STEP_DETECTOR = 18;
/**
* A constant string describing a step detector sensor.
*
* @see #TYPE_STEP_DETECTOR
*/
public static final String STRING_TYPE_STEP_DETECTOR = "android.sensor.step_detector";
/**
* A constant describing a step counter sensor.
* <p>
* A sensor of this type returns the number of steps taken by the user since the last reboot
* while activated. The value is returned as a float (with the fractional part set to zero) and
* is reset to zero only on a system reboot. The timestamp of the event is set to the time when
* the last step for that event was taken. This sensor is implemented in hardware and is
* expected to be low power. If you want to continuously track the number of steps over a long
* period of time, do NOT unregister for this sensor, so that it keeps counting steps in the
* background even when the AP is in suspend mode and report the aggregate count when the AP
* is awake. Application needs to stay registered for this sensor because step counter does not
* count steps if it is not activated. This sensor is ideal for fitness tracking applications.
* It is defined as an {@link Sensor#REPORTING_MODE_ON_CHANGE} sensor.
* <p>
* See {@link android.hardware.SensorEvent#values SensorEvent.values} for more details.
*/
public static final int TYPE_STEP_COUNTER = 19;
/**
* A constant string describing a step counter sensor.
*
* @see #TYPE_STEP_COUNTER
*/
public static final String STRING_TYPE_STEP_COUNTER = "android.sensor.step_counter";
/**
* A constant describing a geo-magnetic rotation vector.
* <p>
* Similar to {@link #TYPE_ROTATION_VECTOR}, but using a magnetometer instead of using a
* gyroscope. This sensor uses lower power than the other rotation vectors, because it doesn't
* use the gyroscope. However, it is more noisy and will work best outdoors.
* <p>
* See {@link android.hardware.SensorEvent#values SensorEvent.values} for more details.
*/
public static final int TYPE_GEOMAGNETIC_ROTATION_VECTOR = 20;
/**
* A constant string describing a geo-magnetic rotation vector.
*
* @see #TYPE_GEOMAGNETIC_ROTATION_VECTOR
*/
public static final String STRING_TYPE_GEOMAGNETIC_ROTATION_VECTOR =
"android.sensor.geomagnetic_rotation_vector";
/**
* A constant describing a heart rate monitor.
* <p>
* The reported value is the heart rate in beats per minute.
* <p>
* The reported accuracy represents the status of the monitor during the reading. See the
* {@code SENSOR_STATUS_*} constants in {@link android.hardware.SensorManager SensorManager}
* for more details on accuracy/status values. In particular, when the accuracy is
* {@code SENSOR_STATUS_UNRELIABLE} or {@code SENSOR_STATUS_NO_CONTACT}, the heart rate
* value should be discarded.
* <p>
* This sensor requires permission {@code android.permission.BODY_SENSORS}.
* It will not be returned by {@code SensorManager.getSensorsList} nor
* {@code SensorManager.getDefaultSensor} if the application doesn't have this permission.
*/
public static final int TYPE_HEART_RATE = 21;
/**
* A constant string describing a heart rate monitor.
*
* @see #TYPE_HEART_RATE
*/
public static final String STRING_TYPE_HEART_RATE = "android.sensor.heart_rate";
/**
* A sensor of this type generates an event each time a tilt event is detected. A tilt event
* is generated if the direction of the 2-seconds window average gravity changed by at
* least 35 degrees since the activation of the sensor. It is a wake up sensor.
*
* @hide
* @see #isWakeUpSensor()
*/
public static final int TYPE_TILT_DETECTOR = 22;
/**
* A constant string describing a wake up tilt detector sensor type.
*
* @hide
* @see #TYPE_WAKE_UP_TILT_DETECTOR
*/
public static final String SENSOR_STRING_TYPE_TILT_DETECTOR =
"android.sensor.tilt_detector";
/**
* A constant describing a wake gesture sensor.
* <p>
* Wake gesture sensors enable waking up the device based on a device specific motion.
* <p>
* When this sensor triggers, the device behaves as if the power button was pressed, turning the
* screen on. This behavior (turning on the screen when this sensor triggers) might be
* deactivated by the user in the device settings. Changes in settings do not impact the
* behavior of the sensor: only whether the framework turns the screen on when it triggers.
* <p>
* The actual gesture to be detected is not specified, and can be chosen by the manufacturer of
* the device. This sensor must be low power, as it is likely to be activated 24/7.
* Values of events created by this sensors should not be used.
*
* @see #isWakeUpSensor()
* @hide This sensor is expected to only be used by the system ui
*/
public static final int TYPE_WAKE_GESTURE = 23;
/**
* A constant string describing a wake gesture sensor.
*
* @hide This sensor is expected to only be used by the system ui
* @see #TYPE_WAKE_GESTURE
*/
public static final String STRING_TYPE_WAKE_GESTURE = "android.sensor.wake_gesture";
/**
* A constant describing a wake gesture sensor.
* <p>
* A sensor enabling briefly turning the screen on to enable the user to
* glance content on screen based on a specific motion. The device should
* turn the screen off after a few moments.
* <p>
* When this sensor triggers, the device turns the screen on momentarily
* to allow the user to glance notifications or other content while the
* device remains locked in a non-interactive state (dozing). This behavior
* (briefly turning on the screen when this sensor triggers) might be deactivated
* by the user in the device settings. Changes in settings do not impact the
* behavior of the sensor: only whether the framework briefly turns the screen on
* when it triggers.
* <p>
* The actual gesture to be detected is not specified, and can be chosen by the manufacturer of
* the device. This sensor must be low power, as it is likely to be activated 24/7.
* Values of events created by this sensors should not be used.
*
* @see #isWakeUpSensor()
* @hide This sensor is expected to only be used by the system ui
*/
public static final int TYPE_GLANCE_GESTURE = 24;
/**
* A constant string describing a wake gesture sensor.
*
* @hide This sensor is expected to only be used by the system ui
* @see #TYPE_GLANCE_GESTURE
*/
public static final String STRING_TYPE_GLANCE_GESTURE = "android.sensor.glance_gesture";
/**
* A constant describing a pick up sensor.
*
* A sensor of this type triggers when the device is picked up regardless of wherever it was
* before (desk, pocket, bag). The only allowed return value is 1.0. This sensor deactivates
* itself immediately after it triggers.
*
* @hide Expected to be used internally for always on display.
*/
public static final int TYPE_PICK_UP_GESTURE = 25;
/**
* A constant string describing a pick up sensor.
*
* @hide This sensor is expected to be used internally for always on display.
* @see #TYPE_PICK_UP_GESTURE
*/
public static final String STRING_TYPE_PICK_UP_GESTURE = "android.sensor.pick_up_gesture";
/**
* A constant describing all sensor types.
*/
public static final int TYPE_ALL = -1;
// If this flag is set, the sensor defined as a wake up sensor. This field and REPORTING_MODE_*
// constants are defined as flags in sensors.h. Modify at both places if needed.
private static final int SENSOR_FLAG_WAKE_UP_SENSOR = 1;
/**
* Events are reported at a constant rate which is set by the rate parameter of
* {@link SensorManager#registerListener(SensorEventListener, Sensor, int)}. Note: If other
* applications are requesting a higher rate, the sensor data might be delivered at faster rates
* than requested.
*/
public static final int REPORTING_MODE_CONTINUOUS = 0;
/**
* Events are reported only when the value changes. Event delivery rate can be limited by
* setting appropriate value for rate parameter of
* {@link SensorManager#registerListener(SensorEventListener, Sensor, int)} Note: If other
* applications are requesting a higher rate, the sensor data might be delivered at faster rates
* than requested.
*/
public static final int REPORTING_MODE_ON_CHANGE = 1;
/**
* Events are reported in one-shot mode. Upon detection of an event, the sensor deactivates
* itself and then sends a single event. Sensors of this reporting mode must be registered to
* using {@link SensorManager#requestTriggerSensor(TriggerEventListener, Sensor)}.
*/
public static final int REPORTING_MODE_ONE_SHOT = 2;
/**
* Events are reported as described in the description of the sensor. The rate passed to
* registerListener might not have an impact on the rate of event delivery. See the sensor
* definition for more information on when and how frequently the events are reported. For
* example, step detectors report events when a step is detected.
*
* @see SensorManager#registerListener(SensorEventListener, Sensor, int, int)
*/
public static final int REPORTING_MODE_SPECIAL_TRIGGER = 3;
// Mask for the LSB 2nd, 3rd and fourth bits.
private static final int REPORTING_MODE_MASK = 0xE;
private static final int REPORTING_MODE_SHIFT = 1;
// TODO(): The following arrays are fragile and error-prone. This needs to be refactored.
// Note: This needs to be updated, whenever a new sensor is added.
// Holds the reporting mode and maximum length of the values array
// associated with
// {@link SensorEvent} or {@link TriggerEvent} for the Sensor
private static final int[] sSensorReportingModes = {
0, // padding because sensor types start at 1
3, // SENSOR_TYPE_ACCELEROMETER
3, // SENSOR_TYPE_GEOMAGNETIC_FIELD
3, // SENSOR_TYPE_ORIENTATION
3, // SENSOR_TYPE_GYROSCOPE
3, // SENSOR_TYPE_LIGHT
3, // SENSOR_TYPE_PRESSURE
3, // SENSOR_TYPE_TEMPERATURE
3, // SENSOR_TYPE_PROXIMITY
3, // SENSOR_TYPE_GRAVITY
3, // SENSOR_TYPE_LINEAR_ACCELERATION
5, // SENSOR_TYPE_ROTATION_VECTOR
3, // SENSOR_TYPE_RELATIVE_HUMIDITY
3, // SENSOR_TYPE_AMBIENT_TEMPERATURE
6, // SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED
4, // SENSOR_TYPE_GAME_ROTATION_VECTOR
6, // SENSOR_TYPE_GYROSCOPE_UNCALIBRATED
1, // SENSOR_TYPE_SIGNIFICANT_MOTION
1, // SENSOR_TYPE_STEP_DETECTOR
1, // SENSOR_TYPE_STEP_COUNTER
5, // SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR
1, // SENSOR_TYPE_HEART_RATE_MONITOR
1, // SENSOR_TYPE_WAKE_UP_TILT_DETECTOR
1, // SENSOR_TYPE_WAKE_GESTURE
1, // SENSOR_TYPE_GLANCE_GESTURE
1, // SENSOR_TYPE_PICK_UP_GESTURE
};
/**
* Each sensor has exactly one reporting mode associated with it. This method returns the
* reporting mode constant for this sensor type.
*
* @return Reporting mode for the input sensor, one of REPORTING_MODE_* constants.
* @see #REPORTING_MODE_CONTINUOUS
* @see #REPORTING_MODE_ON_CHANGE
* @see #REPORTING_MODE_ONE_SHOT
* @see #REPORTING_MODE_SPECIAL_TRIGGER
*/
public int getReportingMode() {
return ((mFlags & REPORTING_MODE_MASK) >> REPORTING_MODE_SHIFT);
}
static int getMaxLengthValuesArray(Sensor sensor, int sdkLevel) {
// RotationVector length has changed to 3 to 5 for API level 18
// Set it to 3 for backward compatibility.
if (sensor.mType == Sensor.TYPE_ROTATION_VECTOR &&
sdkLevel <= Build.VERSION_CODES.JELLY_BEAN_MR1) {
return 3;
}
int offset = sensor.mType;
if (offset >= sSensorReportingModes.length) {
// we don't know about this sensor, so this is probably a
// vendor-defined sensor, in that case, we don't know how many value
// it has
// so we return the maximum and assume the app will know.
// FIXME: sensor HAL should advertise how much data is returned per
// sensor
return 16;
}
return sSensorReportingModes[offset];
}
/* Some of these fields are set only by the native bindings in
* SensorManager.
*/
private String mName;
private String mVendor;
private int mVersion;
private int mHandle;
private int mType;
private float mMaxRange;
private float mResolution;
private float mPower;
private int mMinDelay;
private int mFifoReservedEventCount;
private int mFifoMaxEventCount;
private String mStringType;
private String mRequiredPermission;
private int mMaxDelay;
private int mFlags;
Sensor() {
}
/**
* @return name string of the sensor.
*/
public String getName() {
return mName;
}
/**
* @return vendor string of this sensor.
*/
public String getVendor() {
return mVendor;
}
/**
* @return generic type of this sensor.
*/
public int getType() {
return mType;
}
/**
* @return version of the sensor's module.
*/
public int getVersion() {
return mVersion;
}
/**
* @return maximum range of the sensor in the sensor's unit.
*/
public float getMaximumRange() {
return mMaxRange;
}
/**
* @return resolution of the sensor in the sensor's unit.
*/
public float getResolution() {
return mResolution;
}
/**
* @return the power in mA used by this sensor while in use
*/
public float getPower() {
return mPower;
}
/**
* @return the minimum delay allowed between two events in microsecond
* or zero if this sensor only returns a value when the data it's measuring
* changes.
*/
public int getMinDelay() {
return mMinDelay;
}
/**
* @return Number of events reserved for this sensor in the batch mode FIFO. This gives a
* guarantee on the minimum number of events that can be batched.
*/
public int getFifoReservedEventCount() {
return mFifoReservedEventCount;
}
/**
* @return Maximum number of events of this sensor that could be batched. If this value is zero
* it indicates that batch mode is not supported for this sensor. If other applications
* registered to batched sensors, the actual number of events that can be batched might be
* smaller because the hardware FiFo will be partially used to batch the other sensors.
*/
public int getFifoMaxEventCount() {
return mFifoMaxEventCount;
}
/**
* @return The type of this sensor as a string.
*/
public String getStringType() {
return mStringType;
}
/**
* @hide
* @return The permission required to access this sensor. If empty, no permission is required.
*/
public String getRequiredPermission() {
return mRequiredPermission;
}
/** @hide */
public int getHandle() {
return mHandle;
}
/**
* This value is defined only for continuous and on-change sensors. It is the delay between two
* sensor events corresponding to the lowest frequency that this sensor supports. When lower
* frequencies are requested through registerListener() the events will be generated at this
* frequency instead. It can be used to estimate when the batch FIFO may be full. Older devices
* may set this value to zero. Ignore this value in case it is negative or zero.
*
* @return The max delay for this sensor in microseconds.
*/
public int getMaxDelay() {
return mMaxDelay;
}
/**
* Returns true if the sensor is a wake-up sensor.
* <p>
* <b>Application Processor Power modes</b> <p>
* Application Processor(AP), is the processor on which applications run. When no wake lock is held
* and the user is not interacting with the device, this processor can enter a â |
