安卓音乐播放器

《物联网移动应用开发》课程设计题目班级学号姓名指导老师2016年6月25日

基本事件流：1.用户按返回键2.播放器退出或者进入后台播放3.概要设计3.1软件播放流程图Step1.启动软件后，软件自动检索手机和sd卡的音频文件，并组织显示成列表.Step2.点击列表的歌曲名字。Step3.播放音乐。Step4.点击暂停，音乐暂停Step5.点击播放转到step3Step6.点击停止停止播放音乐Step7.点击退出。启动软件启动软件自动检索手机中的音乐文件，并显示自动检索手机中的音乐文件，并显示选择歌曲，点击播放选择歌曲，点击播放暂停/退出软件暂停/退出软件图3.1音乐播放器流程图4.界面展示4.1软件部署系统编译生成apk文件，将apk文件拷到手机或者sd卡中，直接打开即可安装。4.2启动软件打开软件后的界面4.3歌曲列表界面歌曲列表界面4.4播放界面5.部分源代码以下给出功能实现代码，布局，风格等代码量过大，放在压缩文件中文件夹显示文件如图所示播放器页面布局Main.xml代码如下<LinearLayoutxmlns:android="/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"android:background="@drawable/tupian"> <ListView android:id="@+id/android:list" android:layout_width="fill_parent" android:layout_height="200dip" android:layout_weight="1" android:drawSelectorOnTop="false" /> <SeekBarandroid:id="@+id/SeekBar01"android:layout_height="wrap_content"android:layout_width="fill_parent"android:max="100"android:progress="0"android:secondaryProgress="0"android:visibility="visible"/><TextViewandroid:layout_height="wrap_content"android:layout_width="fill_parent"android:id="@+id/currentProgress"/><TextViewandroid:layout_height="wrap_content"android:layout_width="fill_parent"android:layout_y="300dp"android:id="@+id/curtimeandtotaltime"/> <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" > <ImageButton android:id="@+id/front_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dip" android:background="@drawable/first1"/> <ImageButton android:id="@+id/stop_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/stop1" android:layout_marginLeft="10dip" /> <ImageButton android:id="@+id/start_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/start1" android:layout_marginLeft="10dip" /> <ImageButton android:id="@+id/pause_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/pose1" android:layout_marginLeft="10dip" /> <ImageButton android:id="@+id/next_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/next1" android:layout_marginLeft="10dip" /> </LinearLayout></LinearLayout>MainActivity.Java代码如下importjava.io.File;importjava.io.FilenameFilter;importjava.io.IOException;importjava.util.ArrayList;importjava.util.List;importandroid.app.ListActivity;importandroid.graphics.Color;importandroid.graphics.drawable.GradientDrawable;importandroid.graphics.drawable.GradientDrawable.Orientation;importandroid.media.MediaPlayer;importandroid.media.MediaPlayer.OnCompletionListener;importandroid.os.Bundle;importandroid.os.Handler;importandroid.view.KeyEvent;importandroid.view.View;importandroid.view.View.OnClickListener;importandroid.widget.ArrayAdapter;importandroid.widget.ImageButton;importandroid.widget.ListView;importandroid.widget.SeekBar;importandroid.widget.SeekBar.OnSeekBarChangeListener;importandroid.widget.TextView;publicclassMainActivityextendsListActivity{ privateImageButtonmFrontImageButton=null; privateImageButtonmStopImageButton=null; privateImageButtonmStartImageButton=null; privateImageButtonmPauseImageButton=null; privateImageButtonmNextImageButton=null; /*定义进度handler，显示百分比进度*/ HandlermPercentHandler=newHandler(); privateSeekBarmSeekBar=null; privateTextViewcurProgressText=null; privateTextViewcurtimeAndTotaltime=null; publicMediaPlayermMediaPlayer; privateList<String>mMusicList=newArrayList<String>(); privateintcurrentListItem=0; privatestaticfinalStringMUSIC_PATH=newString("/sdcard/"); @OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);musicList();mMediaPlayer=newMediaPlayer();initmFrontMusic();initStopMusic();initStartMusic();initPauseMusic();initNextMusic();initSeekBar();} publicvoidinitmFrontMusic() { mFrontImageButton=(ImageButton)findViewById(R.id.front_button); mFrontImageButton.setOnClickListener(newOnClickListener(){ publicvoidonClick(Viewarg0){ if(--currentListItem>=0){ currentListItem=mMusicList.size(); }else{ playMusic(MUSIC_PATH+mMusicList.get(currentListItem)); } } }); } publicvoidinitStopMusic() { mStopImageButton=(ImageButton)findViewById(R.id.stop_button); mStopImageButton.setOnClickListener(newOnClickListener(){ publicvoidonClick(Viewarg0){ if(mMediaPlayer.isPlaying()) { mMediaPlayer.reset(); } } }); } publicvoidinitStartMusic() { mStartImageButton=(ImageButton)findViewById(R.id.start_button); mStartImageButton.setOnClickListener(newOnClickListener(){ publicvoidonClick(Viewarg0){ playMusic(MUSIC_PATH+mMusicList.get(currentListItem)); startSeekBarUpdate(); } }); } publicvoidinitPauseMusic() { mPauseImageButton=(ImageButton)findViewById(R.id.pause_button); mPauseImageButton.setOnClickListener(newOnClickListener(){ publicvoidonClick(Viewarg0){ if(mMediaPlayer.isPlaying()){ mMediaPlayer.pause(); } else{ mMediaPlayer.start(); } } }); } publicvoidinitNextMusic() { mNextImageButton=(ImageButton)findViewById(R.id.next_button); mNextImageButton.setOnClickListener(newOnClickListener(){ publicvoidonClick(Viewarg0){ nextMusic(); } }); } publicvoidinitSeekBar() { /*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); mSeekBar.setOnSeekBarChangeListener(newOnSeekBarChangeListener(){ publicvoidonProgressChanged(SeekBarseekBar,intprogress, booleanfromUser){ /*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); } publicvoidonStartTrackingTouch(SeekBararg0){ curProgressText.setText("拖动中..."); } publicvoidonStopTrackingTouch(SeekBararg0){ intdest=mSeekBar.getProgress(); intmMax=mMediaPlayer.getDuration(); intsMax=mSeekBar.getMax(); mMediaPlayer.seekTo(mMax*dest/sMax); } }); } privatevoidplayMusic(Stringpath) { try{ mMediaPlayer.reset(); mMediaPlayer.setDataSource(path); mMediaPlayer.prepare(); mMediaPlayer.start(); mMediaPlayer.setOnCompletionListener(newOnCompletionListener(){ publicvoidonCompletion(MediaPlayerarg0){ nextMusic(); } }); }catch(IOExceptione){ e.printStackTrace(); } } privatevoidnextMusic() { if(++currentListItem>=mMusicList.size()) { currentListItem=0; } else { playMusic(MUSIC_PATH+mMusicList.get(currentListItem)); } } @Override publicbooleanonKeyDown(intkeyCode,KeyEventevent){if(keyCode==KeyEvent.KEYCODE_BACK){ mMediaPlayer.stop(); mMediaPlayer.release();} returnsuper.onKeyDown(keyCode,event); } @Override protectedvoidonListItemClick(ListViewl,Viewv,intposition,longid){ currentListItem=position; playMusic(MUSIC_PATH+mMusicList.get(position)); super.onListItemClick(l,v,position,id); } //播放列表 publicvoidmusicList() { Filehome=newFile(MUSIC_PATH); if(home.listFiles(newMusicFilter()).length>0) { for(Filefile:home.listFiles(newMusicFilter())) { mMusicList.add(file.getName()); } ArrayAdapter<String>musicList=newArrayAdapter<String>(MainActivity.this,R.layout.musicitem,mMusicList); setListAdapter(musicList); } } /*更新拖动条进度*/ publicvoidstartSeekBarUpdate(){ mPercentHandler.post(start); } Runnablestart=newRunnable(){ publicvoidrun(){ //用一个handler更新SeekBar mPercentHandler.post(updatesb); } }; Runnableupdatesb=newRu