分析和比较开放和封闭的移动平台外文翻译毕 业论文 精品.doc

河南科技学院 2015届本科毕业设计 外文资料及翻译 An?Analysis?and?Comparison?of?Open?and?Closed?Mobile 1.?Introduction? In?recent?years,?the?popularity?of?smart?phone?kept?going?up.?More?and?more?smart?phones?are?sold?anda?lot?of?people?are?embracing?them.?Smart?phones?brought?great?convenience?to?users,?as?well?created?opportunities?for?smart?phone?researchers.?That?s?to?say,?the?wide?spread?of?smart?phones?benefited?both?sides.?At?the?same?time,?developing?of?smart?phone?OS?becomes?one?of?the?smartest?industry.?To?be?a?smart?phone?OS,?the?system?should:?1.?Provide?services?like?a?PC.?2.?Work?with?a?GPU?for?better?visual?effects.?3.?Allow?the?user?to?surf?on?Internet?freely.?And?apparently,?there?re?also?some?weaknesses:1.Limited?battery.?2.?Poor?CPU?performance?against?PC?CPU.?3.?Small?storage.?4.?The?use?of?RAM?may?leads?to?loss?of?data?when?the?phone?runs?out?of battery Now?the?2?giants?of?smart?phone?OS?are?Android?and?iPhone?OS.?On?one?side,?Android?is?based?on?Linux?kernel?and?Dalvik?virtual?machine,?and?it?is?open?sourced.?The?upper?layer?of?Android?is?Java?based,allowing?developers?to?develop?Android?applications?with?Google?SDK?and?sell?their?software?in?Android?Market.?On?theother?side,?iPhone?OS,?which?bases?on?Unix?kernel?and?Darwin?model?but?is?closed?sourced,evolves?from?Mac?OS?X?and?is?the?default?OS?of?iPhone,?iPod?Touch?and?iPad.?Objective?C?based?software?can?run?in?iPhone?OS,?and?just?like?Android,?you?can?develop?your?own?iPhone?applications?and?upload?them?onto?Apple?s??App?Store??for?sale?[1]?[2]?[3]?[4].? By?comparing?the?latest?Android?and?iPhone?OS,?Android?2.2?Froyo?and?iOS?4,?we?can?take?a?glimpse?at?the?main?feature?of?open?and?closed?smart?phone?OSs.?While?the?2?OSs?are?designed?in?rather?different?mentality?and?functionality,?it?s?a?little?early?to?tell?which?one?is?better.? 2.?Smart?Phone?OS? 2.1.?Android? The?system?architecture?of?Android?consists?of?5?layers,?which?are?Linux?Kernel,?Android?Runtime,??Libraries,?Application?Framework?and?Applica