安卓音樂播放器

《物聯(lián)網(wǎng)移動應(yīng)用開發(fā)》課程設(shè)計題目班級學(xué)號姓名指導(dǎo)老師2016年6月25日

基本事件流：1.用戶按返回鍵2.播放器退出或者進入后臺播放3.概要設(shè)計3.1軟件播放流程圖Step1.啟動軟件后，軟件自動檢索手機和sd卡的音頻文件，并組織顯示成列表.Step2.點擊列表的歌曲名字。Step3.播放音樂。Step4.點擊暫停，音樂暫停Step5.點擊播放轉(zhuǎn)到step3Step6.點擊停止停止播放音樂Step7.點擊退出。啟動軟件啟動軟件自動檢索手機中的音樂文件，并顯示自動檢索手機中的音樂文件，并顯示選擇歌曲，點擊播放選擇歌曲，點擊播放暫停/退出軟件暫停/退出軟件圖3.1音樂播放器流程圖4.界面展示4.1軟件部署系統(tǒng)編譯生成apk文件，將apk文件拷到手機或者sd卡中，直接打開即可安裝。4.2啟動軟件打開軟件后的界面4.3歌曲列表界面歌曲列表界面4.4播放界面5.部分源代碼以下給出功能實現(xiàn)代碼，布局，風(fēng)格等代碼量過大，放在壓縮文件中文件夾顯示文件如圖所示播放器頁面布局Main.xml代碼如下<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代碼如下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; /*定義進度handler，顯示百分比進度*/ 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() { /*初始化拖動條和當前進度顯示值*/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){ /*如果拖動進度發(fā)生改變，則顯示當前進度值*/ curProgressText.setText("當前進度:"+progress); } publicvoidonStartTrackingTouch(SeekBararg0){ curProgressText.setText("拖動中..."); } 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); } } /*更新拖動條進度*/ publicvoidstartSeekBarUpdate(){ mPercentHandler.post(start); } Runnablestart=newRunnable(){ publicvoidrun(){ //用一個handler更新SeekBar mPercentHandler.post(updatesb); } }; Runnableupdatesb=newRu