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AndrdoidSensorsOverview(探測器概述)二-創(chuàng)新互聯(lián)

Introduction to Sensors

介紹傳感器

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The Android sensor framework lets you access many types of sensors. Some of these sensors

are hardware-based and some are software-based. Hardware-based sensors are physical components built into a handset or tablet device. They derive their data by directly measuring specific environmental properties, such as acceleration, geomagnetic field strength, or angular change. Software-based sensors are not physical devices, although they mimic hardware-based sensors. Software-based sensors derive their data from one or more of the hardware-based sensors and are sometimes called virtual sensors or synthetic sensors. The linear acceleration sensor and the gravity sensor are examples of software-based sensors.

Android sensor framework 讓你使用多種傳感器。有基于硬件和基于軟件的?;谟布膫鞲衅魇莾?nèi)置于設(shè)備中的物理組件。它們直接測量具體的環(huán)境屬性來得出數(shù)據(jù),例如加速度,地磁場強(qiáng)度,或者角的變化?;谲浖膫鞲衅髂悴皇俏锢碓O(shè)備,盡管它們模擬硬件傳感器。軟件探測器通過一個或者多個硬件傳感器來得出數(shù)據(jù),有時稱為虛擬傳感器或者合成傳感器。線性加速度傳感器和重力傳感器是軟件傳感器的例子。

Table 1 summarizes the sensors that are supported by the Android platform.

表1 總結(jié)了android 平臺支持的傳感器。

Few Android-powered devices have every type of sensor. For example, most handset devices and tablets have an accelerometer and a magnetometer, but fewer devices have barometers or thermometers. Also, a device can have more than one sensor of a given type. For example, a device can have two gravity sensors, each one having a different range.

少有android 設(shè)備每種傳感器都有。例如,大部分手機(jī)設(shè)備和平板有一個加速計(jì)和一個磁力計(jì),但是較少設(shè)備有氣壓計(jì)或溫度計(jì)。一個設(shè)備也可以有一個以上的同類傳感器,如果可以用兩個不同范圍的重力傳感器。

Table 1. Sensor types supported by the Android platform.

表1。Android 平臺支持的傳感器種類。

SensorTypeDescriptionCommon Uses
TYPE_ACCELEROMETERHardware

Measures the acceleration force inm/s2 that is applied to a device on all three physical axes (x, y, and z), including the force of gravity.

測量在設(shè)備的三個軸的加速度,單位 m/s2 ,包括重力加速度

Motion detection (shake, tilt, etc.).

運(yùn)動檢測

TYPE_AMBIENT_TEMPERATUREHardware

Measures the ambient room temperature in degrees Celsius (°C). See note below.

測量室溫,單位攝氏度(°C)

Monitoring air temperatures.

監(jiān)視空氣溫度

TYPE_GRAVITYSoftware or Hardware

Measures the force of gravity in m/s2 that is applied to a device on all three physical axes (x, y, z).

測量在設(shè)備三個軸的重力加速度,單位m/s2 。

Motion detection (shake, tilt, etc.).
TYPE_GYROSCOPEHardware

Measures a device's rate of rotation in rad/s around each of the three physical axes (x, y, and z).

測量在設(shè)備三個軸上的角速度。單位rad/s

Rotation detection (spin, turn, etc.).

旋轉(zhuǎn)檢測

TYPE_LIGHTHardware

Measures the ambient light level (illumination) in lx.

測試環(huán)境亮度級,單位 lx

Controlling screen brightness.

控制屏幕亮度

TYPE_LINEAR_ACCELERATIONSoftware or Hardware

Measures the acceleration force in m/s2 that is applied to a device

on all three physical axes (x, y, and z), excluding the force of gravity.

測量在設(shè)備三軸上的加速度,排除了重力。

Monitoring acceleration along a single axis.

檢測一個軸上的加速度

TYPE_MAGNETIC_FIELDHardware

Measures the ambient geomagnetic field for all three physical axes (x, y, z) in μT.

測量三軸的地磁場,單位μT

Creating a compass.

創(chuàng)建一個羅盤

TYPE_ORIENTATIONSoftware

Measures degrees of rotation that a device makes around all three physical axes (x, y, z).As of API level 3 you can obtain the inclination matrix and rotation matrix for  a device by using the gravity sensor and the geomagnetic field sensor in conjunction with the getRotationMatrix() method.

測量設(shè)備繞三軸轉(zhuǎn)的旋轉(zhuǎn)度。

Determining device position.
TYPE_PRESSUREHardwareMeasures the ambient air pressure in hPa or mbar.測量氣壓
Monitoring air pressure changes.
TYPE_PROXIMITYHardwareMeasures the proximity of an object in cm relative to the view screen of a device. This sensor is typically used to determine whether a handset is being held up to a person's ear.Phone position during a call.
TYPE_RELATIVE_HUMIDITYHardwareMeasures the relative ambient humidity in percent (%).Monitoring dewpoint, absolute, and relative humidity.
TYPE_ROTATION_VECTORSoftware or HardwareMeasures the orientation of a device by providing the three elements of the device's    rotation vector.Motion detection and rotation detection.
TYPE_TEMPERATUREHardwareMeasures the temperature of the device in degrees Celsius (°C). This sensor implementation varies across devices and this sensor was replaced with the TYPE_AMBIENT_TEMPERATURE sensor in API Level 14Monitoring temperatures.

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