【移動應(yīng)用開發(fā)技術(shù)】Andrdoid Sensors Overview (探測器概述)一

【移動應(yīng)用開發(fā)技術(shù)】AndrdoidSensorsOverview(探測器概述)一

MostAndroid-powereddeviceshavebuilt-insensorsthatmeasuremotion,orientation,

and

大部分Android設(shè)備有內(nèi)置的探測器，用于探測運動，方位，及各種環(huán)境條件。variousenvironmentalconditions.Thesesensorsarecapableofprovidingrawdatawithhigh如果你想要探測三位設(shè)備運動或定位，或者想要探測設(shè)備附近環(huán)境變化，這些探測器所能夠提供的高精準的探測數(shù)值將會非常有用。precisionandaccuracy,andareusefulifyouwanttomonitorthree-dimensionaldevicemovementor

positioning,oryouwanttomonitorchangesintheambientenvironmentnearadevice.Forexample,a

gamemighttrackreadingsfromadevice'sgravitysensortoinfer例如，一款游戲可能需要持續(xù)讀取設(shè)備的重力感應(yīng)數(shù)值來解析復雜的用戶姿勢和運動，比如傾斜，晃動，旋轉(zhuǎn)，或搖擺。類似地，一個天氣應(yīng)用會使用溫度探測器和濕度探測器來計算并報告結(jié)露點，又或者一款旅游應(yīng)用使用地磁場探測器和加速器來報告指南針方位。complexusergestures

andmotions,suchastilt,shake,rotation,orswing.Likewise,aweatherapplicationmightusea

device'stemperaturesensorandhumiditysensortocalculateandreportthedewpoint,oratravel

applicationmightusethegeomagneticfieldsensorandaccelerometertoreportacompass

bearing.TheAndroidplatformsupportsthreebroadcategoriesofsensors:Android平臺支持三大類傳感器：Motionsensors運動傳感器Thesesensorsmeasureaccelerationforcesandrotationalforcesalongthreeaxes.This

categoryincludesaccelerometers,gravitysensors,gyroscopes,androtationalvectorsensors.這類探測器通過三個軸測量加速力量和旋轉(zhuǎn)力量。包括加速計，重力探測器，陀螺儀，和穿轉(zhuǎn)矢量傳感器。Environmentalsensors環(huán)境傳感器Thesesensorsmeasurevariousenvironmentalparameters,suchasambientairtemperature

andpressure,illumination,andhumidity.Thiscategoryincludesbarometers,photometers,andthermometers.這類探測器測量各種環(huán)境參數(shù)，例如環(huán)境的氣溫與氣壓，光照與濕度。包括氣壓計，光度計，和溫度計。Positionsensors位置探測器Thesesensorsmeasurethephysicalpositionofadevice.Thiscategoryincludesorientationsensorsandmagnetometers.這類探測器測量設(shè)備的物理位置。包括定位傳感器和磁力計。YoucanaccesssensorsavailableonthedeviceandacquirerawsensordatabyusingtheAndroid

sensorframework.Thesensorframeworkprovidesseveralclassesandinterfacesthathelpyouperformawide

varietyofsensor-relatedtasks.Forexample,youcanusethesensorframeworktodothefollowing:通過使用Androidsensorframework，你可以訪問到設(shè)備上可用的探測器并獲取原始的探測數(shù)據(jù)。這個探測框架提供了幾個類和接口幫助你執(zhí)行一系列探測器相關(guān)的任務(wù)。例如，你可以使用sensorframework來做以下事情：Determinewhichsensorsareavailableonadevice.確定設(shè)備上那些探測器可用。Determineanindividualsensor'scapabilities,suchasitsmaximumrange,manufacturer,powerrequirements,andresolution.確定某個探測器的功能，例如最大探測距離，制造商，供電要求，和分辨率。Acquirerawsensordataanddefinetheminimumrateatwhichyouacquiresensordata.獲取原始探測數(shù)據(jù)并定義獲取數(shù)據(jù)的最小速度。Registerandunregistersensoreventlistenersthatmonitorsensorchanges.注冊和注銷監(jiān)測探測器變化的sensoreventlistners。Thistopicprovidesanoverviewofthe