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外文翻譯中文+英文14頁2651字?jǐn)?shù)外文文獻(xiàn):DevelopRichMultimediaAppswithJ2METheportabilityofJ2MEacrossplatformscanbeusedtocreatemultimediaappsthattakefulladvantageoftheblisteringconnectivityspeedsprovidedby3Gnetworks.Tuesday,March03,2009SunMicrosystemsclaimsthatJavaMEisthemostubiquitousapplicationplatformformobiledevices,deployedonmorethanabillionsets.Apartfromthegreatadvantageofportabilityacrossdevicesalongwithrobustsecurity,JavaMEprovidesarichsetofAPIsfortodaysmultimediaandwebenabledmobilehandsets.Someoftheusefullibraries/APIsprovidedbytheJavaMEplatformare:WirelessMessagingAPIMobileMediaAPIJAXPXMLParserLocationAPIMobile3DGraphicsPaymentAPIInthearticle“CreatingAppsforMobiles”,publishedinPCQJan09,weexploredtheJ2MEdevelopmenttoolstocreateasimpleapplication.WewillcontinuetheexplorationbycreatingatinyvideoplayerusingtheMobileMediaAPI。MobileMediaAPI(JSR135)TheMobileMediaAPIprovidesaninterfacetothemultimediacapabilitiesofthemobiledevicerunningJ2ME.Thisincludesthespeaker(orheadset),microphone,LCDScreen(forvideo)andCamera(ifavailable).ThepackagenamefortheMobileMediaAPIis:javax.microedition.media.Thebuildingblocksofthesystemconsistof-Manager,PlayerandControl.TheManageristhetoplevelcontrollerforthemultimediaresources.J2MEapplicationsusetheManagertocreateandmanagePlayersandquerystatusandpropertiesofthePlayers.ThePlayersactuallyplaythemultimediacontent.TheControlinterfaceisusedtoimplementthedifferentcontrolsaPlayermighthave,suchasVolumeControltoincrease/decreasethevolume.CreateatinyvideoplayerapplicationInthisarticlewewillgothroughthestepsofcreatingaprojectusingtheMobileMediaAPIandthendevelopthecoderequiredtocreatetheplayer.PleaserefertothePCQJan09issue()fortheproceduretoinstallthetools.YoucantestthisapplicationontheEmulator,buttouseitonamobiledevice,youwillneedadataconnectionsuchasGPRSortheblazingfast3G.Wewillstartbycreatingaprojectwiththefollowingdetails:Thetoolkitwillcreatetheprojectandshowthepathswhereyouhavetocreatethesourcefiles.CreatingthesourcefileforPCQ_PlayerApplicationWenowwritethecodetoprovidethedesiredfunctionalitytoyourapplication:packagecom.j2me.part1;importjavax.microedition.lcdui.*;importjavax.microedition.midlet.MIDlet;importjavax.microedition.media.*;importjavax.microedition.media.control.*;publicclassPCQ_PlayerextendsMIDletimplementsCommandListenerprivateDisplaydisplay;privateFormform;VideoPlayervPlayer;publicPCQ_Player()display=Display.getDisplay(this);form=newForm(PCQPlayer);publicvoidstartApp()form.addCommand(newCommand(Exit,Command.EXIT,1);form.setCommandListener(this);vPlayer=newVideoPlayer(display,form,/guest/R1.mpg);Threadrunner=newThread(vPlayer);runner.start();publicvoidpauseApp()publicvoiddestroyApp(booleanunconditional)publicvoidcommandAction(Commandcommand,Displayabledisp)vPlayer.playerClose();destroyApp(true);notifyDestroyed();classVideoPlayerimplementsRunnable,PlayerListenerFormform;Playerplayer;Displaydisplay;Stringurl;publicVideoPlayer(Displaydisplay,Formform,Stringurl)this.disp

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