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: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