2023年安卓Android广播线程服务与多媒体开发实验报告

实验报告（2023/2023学年第一学期）课程名称软件技术系列课程（Andr。id基础）实验名称Android广播、线程、服务与多媒体开发实验时间2023年12月9日指导单位计算机学院、诚迈科技（南京）公司指导教师学生姓名班级学号学院（系）计算机学院专业软件工程（计算机软件与服务外包）成批阅人王彦日期2023-12-四、实验小结（涉及问题和解决方法、心得体会等）.对于sendBroadCast的intent对象，需要设立其actionname；.推荐使用显式指明receiver,在配置文献AndroidManifest.xml指明;.一个receiver可以接受多个action;.每次接受广播都会重新生成一个接受广播的对象，再次调用onReceive;.在BroadCast中尽量不要解决太多逻辑问题，建议复杂的逻辑交给Activity或者Service去解决。通过这次实验，让我对Broadcast、特别是Service有了更进一步的结识，还让我意识到编程方面和知识体系机构方面存在的局限性。总之,这次实验让我Android编程能力有了一定的提高。运用这次实验,也将我们的大作业更加完善。

绩09实验报告实验名称Android广播、线程、服务与多媒体开发指导教师实验类型实验实验学时4实验时间2023-12-9一、实验目的和规定验证Broadcast的发送与接受验证多线程间的数据传递验证Service的使用方法验证多媒体开发中音频、视频、或图像的采集与播放编写一个Android小程序规定：1、使用广播传递数据或信息2、使用多线程3＞适当应用Service4、实现至少一种多媒体功能二、实验环境(实验设备)PC(Window7).Eclipse三、实验原理及内容在这个程序中涉及到了Receiver和BroadcastReceiver的结合使用,一方面在AndroidManifest.xml中注册Receiver,实现可以在后台播放音乐的功能。通过CommandReceiver类实现接受前台Activity发送的播放命令的Intent。在CommandReceiver类中,有后台Service注册的接受前台控制命令Intent的Receiver,广播播放状态变化的Intent代码pub1icclassMusicServiceextendsServiceimp1ementsRunnable{®privateMediaP1ayerp1ayer；privateList<Music>lists;publicstaticint_id=1;//当前播放位置。pub1icstaticBooleanisRun=true;。publicLrcProcessmLrcProcess;。pub1icLrcViewmLrcView；publiestaticintpLaying_id=0;publicstaticBocleanpLaying=false;@0verride。publicIBinderonBind(Intentarg0){。//TODOAuto-generatedmethodstubooreturnnull；。}@0verride»pub1icvoidonCreate(){//TODOAuto—generatedmethodstub。。lists=MusicList,getMusicDa?a(getApp1icationContext());。oSeekBarBroadcastReceiverreceiver=newSeekBarBroadcastReceiver()；。IntentFi1terfi1ter=newIntentFiIter(".kar1.seekBar")；。this.registerReceiver(receiver,filter)；«newThread(this),start();。。super.onCreate();)@0verridepub1icvoidonStart(Intentintent,intstartId){TODOAuto—generatedmethodstubStringplay=intent.getStringExtra("play");—id=intent.getIntExtra("id",1)；。。讦(play,equals("play")){(nul1!=p1ayer){ooooplayer.release()；。…player=null;03。}。。。p1ayMusic(_id);«}elseif(play.equa1s("pause")){(null!=player){…p1ayer.pause();000}。。}e1seif(play.equals("playing")){°。。if(player!=null){。o。叩1ayer.start();。。}e1se{p1ayMusic(_id)；}e1seif(play.equals("replaying")){«®}elseif(play.equals("first")){。ointid=intent,getintExtra("id",0);。。p1ayMusic(id);。}elseif(play.equals("rewind**)){。ointid=intent.getIntExtra("id",0);oooplayMusic(id);so}elseif(play.equals("forward")){oeointid=intent.getlntExtra("id'1,0)；。playMusic(id);。。}elseif(play.equals("last")){。bintid=intent.getIntExtra("id",0)；。splayMusic(id);。｝。privatevoidplayMusic(intid){。/////////////////////////初始化歌词配置〃〃〃///unu1111////iiomLrcProcess=newLrcProcess();。//读取歌词文献。mLrcProcess.readLRC(lists.get(_id).getUri());。//传回解决后的歌词文献o1rcList=mLrcProcess.getLrcContent();。。MusicActivity.Lrc_view,setSentenceEntities(1rcList);°°切换带动网显示歌词MusicActivity.Lr(?_kiew.setAnimation(AnimationUtils.LoadAnimation(。。。MusicService.this,R.anim.a/pha_z));，〃启动线程»mHandler.post(mRunnab1e);。。〃//〃/////〃//〃〃////〃初始化歌词配置〃///〃///〃〃〃〃//III//if(null!=player){。。叩layer,release()；®®player=nu11;°}。if(id>=lists.size()-1){s。5_id=lists.size()—1;a0}elseif(id<=0){，_id=0;00}。Musicm=lists.get(_id);oostringurl=m.getUr1();o®UrimyUri=Uri.pc?rse(url);oplayer=newMediaPlayer()；。。player.reset();«p1ayer.setAudioStreamType(AudioManager.STREAM_MUSIC)；。atry(。。。player,setDataSource(getApplicationContext(),myUri);。player,prepare();。。}catch(11lega1ArgumentExceptione){。。//TODOAuto-generatedcatchb1ocks。e.printStackTrace();。。}catch(SecurityExceptione){。。〃TODOAuto—generatedcatchb1ock。e.printStackTrace();}catch(I1legalStateExceptione){。。。//TODOAuto—generatedcatchblock。a。e.printStackTrace();}catch(IOExceptione){。。。〃TODOAuto-generatedcatchbiock。。。0.printStackTrace()；eo}player.start();叩1ayer.setOnCompletionListener(newOnComp1etionListener(){。@Overrideao&publicvoidonCompletion(MediaPlayermp){。。。。//TODOAuto—generatedmethodstub。。//下一首，。。if(MusicActivity.isLoop==true){。。。叩1ayer.reset()；o®®Intentintent=newIntent(".karp1etion")；ooooosendBroadcast(intent);s。。_id=_id+1;ooooplayMusic(_i(/);。。。}else{//单曲播放。。。。player.re$et();。a»aIntentintent=newIntent(".p1etion");…3。sendBroadcast(intent);°b°°叩］ayMusic(_/d)；oooo)0Q。}。。});。player.setOnErrorListener(new0nErrorListener(){ooo@0verride。。。publicboo1eanonError(MediaP1ayermp,intwhat,intextra){。。。〃TODOAuto-generatedmethodstubcooif(nu11!=player){。…p1ayer.release()；。。p1ayer=null;006}oMusicm=lists.get(_id);oooStringur1=m.getUrl();ooosUrimyllri=Uri.parse(url);。。。。player=newMediaP1ayer();。…player.reset();ooooplayer.setAudioStreamType(AudioManager.STREAM_MUSIC)：。。。，。player.setDataSource(getApplicationContext(),myllri)；。a。。player.prepare();。。。。}catch(IliegalArgumeritExceptione){3//TODOAuto-generatedcatchblock。。。3。e.printStackTrace();°。。，}catch(SecurityExceptione){。。。〃TODOAuto-generatedcatchblocke.printstackTrace();。。。。}catch(IllegalStateExceptione){。。。//TODOAuto-generatedcatchb1ock—oe.printStackTrace();。s}catch(lOExceptione){。。。。//TODOAuto-generatedcatchblock。。。oe.printStackTrace();OQ0}。。。。player.start();。。。，returnfaIse;，)00})；°}。privatec1assSeekBarBroadcastReceiverextendsBroadcastReceiver(。。@0verride。。publicvoidonReceive(Contextcontext,Intentintent){。a//ToDoAuto—generatedmethodstub。ointseekBarPosition=intent.getlntExtra("seekBarPosition”,0)；。。。//System.out.println("-"+seekBarPosition);。。®player.seekTo(seekBarPosition*player.getDuration()/100);。»player.start()；。}o@0verridepublicvoidrun(){o//TODOAuto-generatedmethodstub。while(isRun){。atry{°。。3Thread.sLeep(200)；。}catch(InterruptedExceptione){。。。//TODOAuto—generatedcatchblockooooe.printStackTrace()；00}oif(nu11!=p1ayer){。。intposition=player,getCurrentPosition();totai=p1ayer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