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1、AndroidAndroid,asasystem,isaJava-basedoperatingsystemthatrunsontheLinux2.6kernel.Thesystemisverylightweightandfullfeatured.AndroidapplicationsaredevelopedusingJavaandcanbeportedrathereasilytothenewplatform.IfyouhavenotyetdownloadedJavaorareunsureaboutwhichver
2、sionyouneed,IdetailtheinstallationofthedevelopmentenvironmentinChapter2.OtherfeaturesofAndroidincludeanaccelerated3-Dgraphicsengine(basedonhardwaresupport),databasesupportpoweredbySQLite,andanintegratedwebbrowser.IfyouarefamiliarwithJavaprogrammingorareanOOPd
3、eveloperofanysort,youarelikelyusedtoprogrammaticuserinterface(UI)development—thatis,UIplacementwhichishandleddirectlywithintheprogramcode.Android,whilerecognizingandallowingforprogrammaticUIdevelopment,alsosupportsthenewer,XML-basedUIlayout.XMLUIlayoutisafair
4、lynewconcepttotheaveragedesktopdeveloper.IwillcoverboththeXMLUIlayoutandtheprogrammaticUIdevelopmentinthesupportingchaptersofthisbook.OneofthemoreexcitingandcompellingfeaturesofAndroidisthat,becauseofitsarchitecture,third-partyapplications—includingthosethata
5、re“homegrown”—areexecutedwiththesamesystempriorityasthosethatarebundledwiththecoresystem.Thisisamajordeparturefrommostsystems,whichgiveembeddedsystemappsagreaterexecutionprioritythanthethreadpriorityavailabletoappscreatedbythird-partydevelopers.Also,eachappli
6、cationisexecutedwithinitsownthreadusingaverylightweightvirtualmachine.AsidefromtheverygenerousSDKandthewell-formedlibrariesthatareavailabletoustodevelopwith,themostexcitingfeatureforAndroiddevelopersisthatwenowhaveaccesstoanythingtheoperatingsystemhasaccessto
7、.Inotherwords,ifyouwanttocreateanapplicationthatdialsthephone,youhaveaccesstothephone’sdialer;ifyouwanttocreateanapplicationthatutilizesthephone’sinternalGPS(ifequipped),youhaveaccesstoit.Thepotentialfordeveloperstocreatedynamicandintriguingapplicationsisnoww
8、ideopen.OntopofallthefeaturesthatareavailablefromtheAndroidsideoftheequation,Googlehasthrowninsomeverytantalizingfeaturesofitsown.DevelopersofAndroidapplicationswillbeabletotietheirapplic
