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外文翻译--开发丰富的多媒体应用与J2ME.doc

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外文翻译--开发丰富的多媒体应用与J2ME.doc

外文翻译中文英文14页2651字数外文文献DevelopRichMultimediaAppswithJ2METheportabilityofJ2MEacrossplatformscanbeusedtocreatemultimediaappsthattakefulladvantageoftheblisteringconnectivityspeedsprovidedby3Gnetworks.Tuesday,March03,2009SunMicrosystemsclaimsthatJavaMEisthemostubiquitousapplicationplatformformobiledevices,deployedonmorethanabillionsets.Apartfromthegreatadvantageofportabilityacrossdevicesalongwithrobustsecurity,JavaMEprovidesarichsetofAPIsfortodaysmultimediaandwebenabledmobilehandsets.Someoftheusefullibraries/APIsprovidedbytheJavaMEplatformareWirelessMessagingAPIMobileMediaAPIJAXPXMLParserLocationAPIMobile3DGraphicsPaymentAPIInthearticleCreatingAppsforMobiles,publishedinPCQJan09,weexploredtheJ2MEdevelopmenttoolstocreateasimpleapplication.WewillcontinuetheexplorationbycreatingatinyvideoplayerusingtheMobileMediaAPI。MobileMediaAPIJSR135TheMobileMediaAPIprovidesaninterfacetothemultimediacapabilitiesofthemobiledevicerunningJ2ME.Thisincludesthespeakerorheadset,microphone,LCDScreenforvideoandCameraifavailable.ThepackagenamefortheMobileMediaAPIisjavax.microedition.media.ThebuildingblocksofthesystemconsistofManager,PlayerandControl.TheManageristhetoplevelcontrollerforthemultimediaresources.J2MEapplicationsusetheManagertocreateandmanagePlayersandquerystatusandpropertiesofthePlayers.ThePlayersactuallyplaythemultimediacontent.TheControlinterfaceisusedtoimplementthedifferentcontrolsaPlayermighthave,suchasVolumeControltoincrease/decreasethevolume.CreateatinyvideoplayerapplicationInthisarticlewewillgothroughthestepsofcreatingaprojectusingtheMobileMediaAPIandthendevelopthecoderequiredtocreatetheplayer.PleaserefertothePCQJan09issuealsoavailableonlineatpcquest.comfortheproceduretoinstallthetools.YoucantestthisapplicationontheEmulator,buttouseitonamobiledevice,youwillneedadataconnectionsuchasGPRSortheblazingfast3G.WewillstartbycreatingaprojectwiththefollowingdetailsThetoolkitwillcreatetheprojectandshowthepathswhereyouhavetocreatethesourcefiles.CreatingthesourcefileforPCQ_PlayerApplicationWenowwritethecodetoprovidethedesiredfunctionalitytoyourapplicationpackagecom.j2me.part1importjavax.microedition.lcdui.importjavax.microedition.midlet.MIDletimportjavax.microedition.media.importjavax.microedition.media.control.publicclassPCQ_PlayerextendsMIDletimplementsCommandListener{privateDisplaydisplayprivateFormformVideoPlayervPlayerpublicPCQ_Player{displayDisplay.getDisplaythisformnewFormPCQPlayer}publicvoidstartApp{form.addCommandnewCommandExit,Command.EXIT,1form.setCommandListenerthisvPlayernewVideoPlayerdisplay,form,http//createapoll.net/guest/R1.mpgThreadrunnernewThreadvPlayerrunner.start}publicvoidpauseApp{}publicvoiddestroyAppbooleanunconditional{}publicvoidcommandActionCommandcommand,Displayabledisp{vPlayer.playerClosedestroyApptruenotifyDestroyed}}classVideoPlayerimplementsRunnable,PlayerListener{FormformPlayerplayerDisplaydisplayStringurlpublicVideoPlayerDisplaydisplay,Formform,Stringurl{this.displaydisplaythis.formformthis.urlurl}publicvoidrun{try{AlertalertnewAlertBuffering...//Downloadtakestimealert.setTimeoutAlert.FOREVER//sodisplaymessage

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