Andrdoid Sensors Overview (探測器概述)二

Introduction to Sensors

介紹傳感器

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。基于硬件的傳感器是內置于設備中的物理組件。它們直接測量具體的環境屬性來得出數據，例如加速度，地磁場強度，或者角的變化。基于軟件的傳感器你不是物理設備，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據，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 設備每種傳感器都有。例如，大部分手機設備和平板有一個加速計和一個磁力計，但是較少設備有氣壓計或溫度計。一個設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。