安卓音乐播放器实现代码

1、1.Mp3Player.java文件packagecom.jacky.multimedia;importjava.io.File;importjava.io.FilenameFilter;importjava.io.IOException;importjava.util.ArrayList;importjava.util.List;importandroid.app.ListActivity;importandroid.media.MediaPlayer;importandroid.media.MediaPlayer.OnCompletionListener;importandroid.os.

2、Bundle;importandroid.os.Handler;importandroid.view.KeyEvent;importandroid.view.View;importandroid.widget.ArrayAdapter;importandroid.widget.ImageButton;一|importandroid.widget.ListView;importandroid.widget.SeekBar;importandroid.widget.SeekBar.OnSeekBarChangeListener;importandroid.widget.TextView;publi

3、cclassMp3PlayerextendsListActivity|/*Calledwhentheactivityisfirstcreated.*/*定义5个图像按钮*/privateImageButtonmFrontImageButton=null;privateImageButtonmStartImageButton=null;privateImageButtonmPauseImageButton=null;privateImageButtonmStopImageButton=null;privateImageButtonmNextImageButton=null;/*定义进度handl

4、er,显示百分比进度*/HandlermPercentHandler=newHandler。;/*定义拖动条*/privateSeekBarmSeekBar=null;/*定义显示文本框*/privateTextViewcurProgressText=null;privateTextViewcurtimeAndTotaltime=null;/*定于一个多媒体对象*/publicMediaPlayermMediaPlayer=null;/*定于一个数据播放列表，用来存放从指定文件中搜索到的文件*/privateListmMusicList=newArrayList();|/*定义在播放列表中的当

5、前选择项*/privateintcurrentListItme=0;/*定义要播放的文件夹路径*/privatestaticfinalStringMUSIC_PATH=newString(/mnt/sdcard/);/*Calledwhentheactivityisfirstcreated.*/OverridepublicvoidonCreate(BundlesavedInstanceState)|super.onCreate(savedInstanceState);setContentView(R.layout.main);/*更新播放列表*/musicList();|/*初始化多媒体对象*

6、/mMediaPlayer=newMediaPlayer();/*初始化图像按钮*/mFrontImageButton=(ImageButton)findViewById(R.id.LastImageButton);mStopImageButton=(ImageButton)findViewById(R.id.StopImageButton);mStartImageButton=(ImageButton)findViewById(R.id.StartImageButton);mPauseImageButton=(ImageButton)findViewById(R.id.PauseImageB

7、utton);mNextImageButton=(ImageButton)findViewById(R.id.NextImageButton);/*初始化拖动条和当前进度显示值*/mSeekBar=(SeekBar)findViewById(R.id.SeekBar01);curProgressText=(TextView)findViewById(R.id.currentProgress);curtimeAndTotaltime=(TextView)findViewById(R.id.curtimeandtotaltime);/*监听停止按钮*/mStopImageButton.setOnC

8、lickListener(newImageButton.OnClickListener()OverridepublicvoidonClick(Viewv)/*判断是否正在播放歌曲*/if(mMediaPlayer.isPlaying()/*如果在播放歌曲时，按下开始按钮，则重开开始播放*/mMediaPlayer.reset();)；/*监听开始按钮*/mStartImageButton.setOnClickListener(newImageButton.OnClickListener()|(OverridepublicvoidonClick(Viewv)_|/*播放当前选择歌曲，通过list

9、View列表中onListItemClick方法得到选择的时第几项*/playMusic(MUSIC_PATH+mMusicList.get(currentListItme);/*开始播放歌曲时，同步进行更新拖动条进度*/startSeekBarUpdate(););/*监听暂停按钮*/mPauseImageButton.setOnClickListener(newImageButton.OnClickListener()publicvoidonClick(Viewview)if(mMediaPlayer.isPlaying()/*如果有播放歌曲，暂停*/mMediaPlayer.pause(

10、);else|/*如果没有播放歌曲，则开始播放*/mMediaPlayer.start(););/*监听下一首按钮*/mNextImageButton.setOnClickListener(newImageButton.OnClickListener()OverridepublicvoidonClick(ViewargO)nextMusic(););/*监听上一首按钮*/mFrontImageButton.setOnClickListener(newImageButton.OnClickListener()(OverridepublicvoidonClick(Viewarg0)(FrontMu

11、sic();|);/*监听拖动条*/mSeekBar.setOnSeekBarChangeListener(newOnSeekBarChangeListener()(publicvoidonProgressChanged(SeekBarseekBar,intprogress,|booleanfromUser)/TODOAuto-generatedmethodstub_|/*如果拖动进度发生改变，则显示当前进度值*/curProgressText.setText(当前进度：+progress);OverridepublicvoidonStartTrackingTouch(SeekBarseekB

12、ar)/TODOAuto-generatedmethodstub|curProgressText.setText(拖动中.);OverridepublicvoidonStopTrackingTouch(SeekBarseekBar)/TODOAuto-generatedmethodstub|intdest=seekBar.getProgress();intmMax=mMediaPlayer.getDuration();intsMax=mSeekBar.getMax();mMediaPlayer.seekTo(mMax*dest/sMax););/*按键处理时间，当按下返回按键时的处理方法*/p

13、ublicbooleanonKeyDown(intkeyCode,KeyEventevent)(if(keyCode=KeyEvent.KEYCODE_BACK)(mMediaPlayer.stop();mMediaPlayer.release();|this.finish();returntrue;returnsuper.onKeyDown(keyCode,event);|/*ListView选择项监听方法，即当前鼠标在列表中选择的第几项protectedvoidonListItemClick(ListViewl,Viewv,intposition,longid)(currentListIt

14、me=position;playMusic(MUSIC_PATH+mMusicList.get(position);/*更新播放列表*/publicvoidmusicList()/*从指定的路径中读取文件，并与播放列表关联*/Filehome=newFile(MUSIC_PATH);/*读取指定类型的文件，在本程序，指定播放类型为mp3*/if(home.listFiles(newMusicFilter().length0)(/*读取文件*/for(Filefile:home.listFiles(newMusicFilter()(mMusicList.add(file.getName();ne

15、w/*播放文件与播放列表关联*/ArrayAdaptermusicListArrayAdapter(Mp3Player.this,R.layout.musicitme,mMusicList);setListAdapter(musicList);/*播放指定路径中的音乐*/privatevoidplayMusic(Stringpath)(try(/*重置多媒体*/mMediaPlayer.reset();/*读取mp3文件*/mMediaPlayer.setDataSource(path);/*准备播放*/mMediaPlayer.prepare();/*开始播放*/mMediaPlayer.s

16、tart();/*监听播放是否完成*/mMediaPlayer.setOnCompletionListener(newOnCompletionListener()(publicvoidonCompletion(MediaPlayerarg0)/*播放完当前歌曲，自动播放下一首*/nextMusic(););catch(IOExceptione)/*播放下一首*/privatevoidnextMusic()if(+currentListItme=mMusicList.size()currentListItme=0;elseplayMusic(MUSIC_PATH+mMusicList.get(c

17、urrentListItme);/*播放上一首歌曲*/privatevoidFrontMusic()if(-currentListItme=0)currentListItme=0;else(playMusic(MUSIC_PATH+mMusicList.get(currentListltme);)/*更新拖动条进度*/publicvoidstartSeekBarUpdate()|(mPercentHandler.post(start);|)Runnablestart=newRunnable()Overridepublicvoidrun()/TODOAuto-generatedmethodstu

18、bmPercentHandler.post(updatesb);用一个handler更新SeekBar);Runnableupdatesb=newRunnable()Overridepublicvoidrun()/TODOAuto-generatedmethodstub|intposition=mMediaPlayer.getCurrentPosition();intmMax=mMediaPlayer.getDuration();intsMax=mSeekBar.getMax();mSeekBar.setProgress(position*sMax/mMax);curtimeAndTotaltime.setText(当前播放时间：+position/1000+