代码-基于android的mp3播放器的设计与实现

附录PACKAGECOMMUSICMEDIAIMPORTJAVAIOIOEXCEPTIONIMPORTJAVATEXTSIMPLEDATEFORMATIMPORTJAVAUTILDATEIMPORTJAVAUTILRANDOMIMPORTANDROIDAPPNOTIFICATIONMANAGERIMPORTANDROIDAPPSERVICEIMPORTANDROIDCONTENTBROADCASTRECEIVERIMPORTANDROIDCONTENTCONTENTVALUESIMPORTANDROIDCONTENTCONTEXTIMPORTANDROIDCONTENTINTENTIMPORTANDROIDCONTENTINTENTFILTERIMPORTANDROIDDATABASECURSORIMPORTANDROIDMEDIAMEDIAPLAYERIMPORTANDROIDMEDIAMEDIAPLAYERONPREPAREDLISTENERIMPORTANDROIDNETURIIMPORTANDROIDOSHANDLERIMPORTANDROIDOSIBINDERIMPORTANDROIDOSMESSAGEIMPORTANDROIDPROVIDERMEDIASTOREIMPORTANDROIDTELEPHONYTELEPHONYMANAGERIMPORTCOMMUSICMEDIAUTILSPUTILPUBLICCLASSMUSICSERVICEEXTENDSSERVICEIMPLEMENTSMEDIAPLAYERONCOMPLETIONLISTENERPRIVATESTATICFINALSTRINGMUSIC_CURRENT“COMMUSICCURRENTTIME“PRIVATESTATICFINALSTRINGMUSIC_DURATION“COMMUSICDURATION“PRIVATESTATICFINALSTRINGMUSIC_NEXT“COMMUSICNEXT“PRIVATESTATICFINALSTRINGMUSIC_UPDATE“COMMUSICUPDATE“PRIVATESTATICFINALSTRINGMUSIC_LIST“COMMUSICLIST“PRIVATESTATICFINALINTMUSIC_PLAY1PRIVATESTATICFINALINTMUSIC_PAUSE2PRIVATESTATICFINALINTMUSIC_STOP3PRIVATESTATICFINALINTPROGRESS_CHANGE4PRIVATEMEDIAPLAYERMPNULLINTPROGRESSPRIVATEURIURINULLPRIVATEINTID10000PRIVATEHANDLERHANDLERNULLPRIVATEHANDLERRHANDLERNULLPRIVATEHANDLERFHANDLERNULLPRIVATEINTCURRENTTIMEPRIVATEINTDURATIONPRIVATEDBHELPERDBHELPERNULLPRIVATEINTFLAGPRIVATEINTPOSITIONPRIVATEINT_IDSPRIVATEINT_IDPRIVATENOTIFICATIONMANAGERMNMOVERRIDEPUBLICVOIDONCREATESUPERONCREATEIFMPNULLMPRESETMPRELEASEMPNULLMPNEWMEDIAPLAYERMPSETONCOMPLETIONLISTENERTHISMNMNOTIFICATIONMANAGERGETSYSTEMSERVICENOTIFICATION_SERVICE/注册来电接收器/INTENTFILTERFILTERNEWINTENTFILTERFILTERADDACTION“ANDROIDINTENTACTIONANSWER“REGISTERRECEIVERINCOMINGSMSRECEIVER,FILTERRHANDLERNEWHANDLERFHANDLERNEWHANDLEROVERRIDEPUBLICVOIDONDESTROYSUPERONDESTROYMNMCANCELRSTRINGAPP_NAMEIFMPNULLMPSTOPMPNULLIFDBHELPERNULLDBHELPERCLOSEDBHELPERNULLIFHANDLERNULLHANDLERREMOVEMESSAGES1HANDLERNULLOVERRIDEPUBLICVOIDONSTARTINTENTINTENT,INTSTARTIDSUPERONSTARTINTENT,STARTID/初始化MP/IFFLAG0RETURNIFINTENTGETINTARRAYEXTRA“_IDS“NULL_IDSINTENTGETINTARRAYEXTRA“_IDS“INTPOSITION1INTENTGETINTEXTRA“POSITION“,1IFPOSITION11POSITIONPOSITION1_ID_IDSPOSITIONSYSTEMOUTPRINTLN“_ID“_IDSYSTEMOUTPRINTLN“ID“IDINTLENGTHINTENTGETINTEXTRA“LENGTH“,1IF_ID1IFID_IDID_IDURIURIWITHAPPENDEDPATHMEDIASTOREAUDIOMEDIAEXTERNAL_CONTENT_URI,“_IDDBOPERATE_IDTRYMPRESETMPSETDATASOURCETHIS,URICATCHEXCEPTIONEEPRINTSTACKTRACEELSEIFLENGTH1TRYMPRESETMPSETDATASOURCETHIS,URICATCHEXCEPTIONEEPRINTSTACKTRACESETUPINITIFPOSITION1INTENTINTENT1NEWINTENTINTENT1SETACTIONMUSIC_LISTINTENT1PUTEXTRA“POSITION“,POSITIONSENDBROADCASTINTENT1SYSTEMOUTPRINTLN“SERVICEPOSITION“POSITION/开始、暂停、停止/INTOPINTENTGETINTEXTRA“OP“,1IFOP1SWITCHOPCASEMUSIC_PLAY/播放IFMPISPLAYINGPLAYBREAKCASEMUSIC_PAUSE/暂停IFMPISPLAYINGPAUSEBREAKCASEMUSIC_STOP/停止STOPBREAKCASEPROGRESS_CHANGE/改变歌曲进度CURRENTTIMEINTENTGETEXTRASGETINT“PROGRESS“MPSEEKTOCURRENTTIMEBREAKSHOWNOTIFICATION/服务运行时在通知栏显示/PRIVATEVOIDSHOWNOTIFICATION/CHARSEQUENCETEXTGETTEXTRSTRINGAPP_NAMENOTIFICATIONNOTIFICATIONNEWNOTIFICATIONRDRAWABLEMUSIC,“音乐播放器“,SYSTEMCURRENTTIMEMILLISNOTIFICATIONFLAGSNOTIFICATIONFLAG_NO_CLEAR|NOTIFICATIONFLAG_ONGOING_EVENTINTENTPEDOMETERINTENTNEWINTENTPEDOMETERINTENTSETCOMPONENTNEWCOMPONENTNAMETHIS,MUSICACTIVITYCLASSPEDOMETERINTENTADDFLAGSINTENTFLAG_ACTIVITY_CLEAR_TOPPENDINGINTENTCONTENTINTENTPENDINGINTENTGETACTIVITYTHIS,0,PEDOMETERINTENT,0NOTIFICATIONSETLATESTEVENTINFOTHIS,TEXT,“音乐播放中“,CONTENTINTENTMNMNOTIFYRSTRINGAPP_NAME,NOTIFICATION/OVERRIDEPUBLICIBINDERONBINDINTENTINTENTRETURNNULLPRIVATEVOIDPLAYIFMPNULLMPSTARTFLAG1PRIVATEVOIDPAUSEIFMPNULLMPPAUSEFLAG1PRIVATEVOIDSTOPIFMPNULLMPSTOPTRYMPPREPAREMPSEEKTO0CATCHILLEGALSTATEEXCEPTIONEEPRINTSTACKTRACECATCHIOEXCEPTIONEEPRINTSTACKTRACEHANDLERREMOVEMESSAGES1PRIVATEVOIDINITFINALINTENTINTENTNEWINTENTINTENTSETACTIONMUSIC_CURRENTIFHANDLERNULLHANDLERNEWHANDLEROVERRIDEPUBLICVOIDHANDLEMESSAGEMESSAGEMSGSUPERHANDLEMESSAGEMSGIFMSGWHAT1IFFLAG1CURRENTTIMEMPGETCURRENTPOSITIONINTENTPUTEXTRA“CURRENTTIME“,CURRENTTIMESENDBROADCASTINTENTHANDLERSENDEMPTYMESSAGEDELAYED1,600PRIVATEVOIDSETUPFINALINTENTINTENTNEWINTENTINTENTSETACTIONMUSIC_DURATIONTRYIFMPISPLAYINGMPPREPAREMPSETONPREPAREDLISTENERNEWONPREPAREDLISTENEROVERRIDEPUBLICVOIDONPREPAREDMEDIAPLAYERMPHANDLERSENDEMPTYMESSAGE1CATCHILLEGALSTATEEXCEPTIONEEPRINTSTACKTRACECATCHIOEXCEPTIONEEPRINTSTACKTRACEDURATIONMPGETDURATIONINTENTPUTEXTRA“DURATION“,DURATIONSENDBROADCASTINTENTOVERRIDEPUBLICVOIDONCOMPLETIONMEDIAPLAYERMP/播放模式INTPALYMODESPUTILGETGETAPPLICATIONCONTEXT,“PLAYMODE“,0/顺序播放IFPALYMODE0IFPOSITION_IDSLENGTH1POSITION0ELSEIFPOSITIONLRC_MAPNEWTREEMAPPRIVATECURSORMYCURPRIVATESTATICFINALSTRINGMUSIC_CURRENT“COMMUSICCURRENTTIME“PRIVATESTATICFINALSTRINGMUSIC_DURATION“COMMUSICDURATION“PRIVATESTATICFINALSTRINGMUSIC_NEXT“COMMUSICNEXT“PRIVATESTATICFINALSTRINGMUSIC_UPDATE“COMMUSICUPDATE“PRIVATESTATICFINALINTMUSIC_PLAY1PRIVATESTATICFINALINTMUSIC_PAUSE2PRIVATESTATICFINALINTMUSIC_STOP3PRIVATESTATICFINALINTPROGRESS_CHANGE4PRIVATESTATICFINALINTMUSIC_REWIND5PRIVATESTATICFINALINTMUSIC_FORWARD6PRIVATESTATICFINALINTSTATE_PLAY1PRIVATESTATICFINALINTSTATE_PAUSE2PRIVATEINTFLAGPRIVATEFINALSTRINGPALYMODENEWSTRING“顺序播放“,“单曲循环“,“随机播放“PRIVATEINTPALYMODEINT0/关于音量的变量PRIVATEAUDIOMANAGERMAUDIOMANAGERNULLPRIVATEINTMAXVOLUME/最大音量PRIVATEINTCURRENTVOLUME/当前音量PRIVATEBUTTONBTNPLAYMODEPRIVATETOASTUTILTOASTUTILOVERRIDEPROTECTEDVOIDONCREATEBUNDLESAVEDINSTANCESTATESUPERONCREATESAVEDINSTANCESTATESETCONTENTVIEWRLAYOUTLAYOUT_PLAYERTOASTUTILNEWTOASTUTILGETAPPLICATIONCONTEXTINTENTINTENTTHISGETINTENTBUNDLEBUNDLEINTENTGETEXTRAS_IDSBUNDLEGETINTARRAY“_IDS“POSITIONBUNDLEGETINT“POSITION“_TITLESBUNDLEGETSTRINGARRAY“_TITLES“LRCTEXTTEXTVIEWFINDVIEWBYIDRIDLRCNAMETEXTVIEWFINDVIEWBYIDRIDNAMEPLAYTIMETEXTVIEWFINDVIEWBYIDRIDPLAYTIME/已经播放的时间DURATIONTIMETEXTVIEWFINDVIEWBYIDRIDDURATIONBTNPLAYMODEBUTTONFINDVIEWBYIDRIDBTNPLAYMODEMAUDIOMANAGERAUDIOMANAGERGETSYSTEMSERVICECONTEXTAUDIO_SERVICEMAXVOLUMEMAUDIOMANAGERGETSTREAMMAXVOLUMEAUDIOMANAGERSTREAM_MUSIC/获得最大音量CURRENTVOLUMEMAUDIOMANAGERGETSTREAMVOLUMEAUDIOMANAGERSTREAM_MUSIC/获得当前音量GESTUREDETECTORNEWGESTUREDETECTORNEWCHANGEGESTUREDETECTORTHIS/手势识别PLAYBTNIMAGEBUTTONFINDVIEWBYIDRIDPLAYBTNPLAYBTNSETONCLICKLISTENERNEWVIEWONCLICKLISTENEROVERRIDEPUBLICVOIDONCLICKVIEWVSWITCHFLAGCASESTATE_PLAYPAUSEBREAKCASESTATE_PAUSEPLAYBREAKSEEKBARSEEKBARFINDVIEWBYIDRIDSEEKBARSEEKBARSETONSEEKBARCHANGELISTENERNEWONSEEKBARCHANGELISTENEROVERRIDEPUBLICVOIDONSTOPTRACKINGTOUCHSEEKBAR