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Android应用开发--MP3简单音乐播放器点击列表会进入播放的Activity,在这个Activity会接收到从前面的Activity传来的数据，在通过这些数据来启动服务来播放音乐，整个过程很简单，需要注意的是我们要接收的数据是哪些内容，还有我们向Service要传什么样的数据，这是根据自己的开发思路和需求来决定的，等一下你们会看到小鬼到底往Service传了些什么东西，然而这些数据到底起什么作用，需要慢慢去体会，因为这是需要一点一点去调试的。
好了，下面贴一下整个Activity的实现代码，主要是播放的各种状态的实现，因为这个音乐播放器并没有完全开发完，所以朋友们需要弄清楚这一点。
如果对代码的实现有不清楚的，可以给小鬼留言，小鬼有空一定给大家解答。
效果如下：代码如下：package com.anjovo.as.chapter10.exam01;import java.io.IOException;import android.media.AudioManager;import android.media.MediaPlayer;import .Uri;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.ContextMenu;import android.view.ContextMenu.ContextMenuInfo; import android.view.Menu;import android.view.MenuItem;import android.view.SubMenu;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class MusicPlayerActivity extends Activity {protected static final int REQUEST_CODE = 1;private Button btnPlay,btnPause,baStop,back;private ImageView image;private TextView text;private MediaPlayer player;int position = 0;//声明一个变量判断是否为播放，默认为falseprivate boolean isPaused = false,Media=false;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);setContentView(yout.activity_music_player);btnPlay = (Button) findViewById(R.id.bt_play);btnPause = (Button) findViewById(R.id.bt_pause);baStop = (Button) findViewById(R.id.bt_stop);back = (Button) findViewById(R.id.bt_back);image = (ImageView)findViewById(R.drawable.ic_launcher);text = (TextView) findViewById(R.id.text);image = (ImageView) findViewById(R.drawable.fengcun);registerForContextMenu(baStop);//注册，让这个bastop将会启用上下文菜单text.setText("歌词下载错误！");final Intent serintent = newIntent(this,newActivity.class);btnPause.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubstartActivityForResult(serintent,REQUEST_CODE);}});back.setOnClickListener(new Button.OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubfinish();if(Media==true){player.stop();player.release();}}});}public void BlooeanMedia(){if(Media==true){player.release();}}public void Player(MediaPlayer player){ try {if(player!=null){player.stop();}player.prepare();player.start();isPaused = true;Media=true;Toast.makeText(this, "音乐播放中...", Toast.LENGTH_LONG).show();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}@Overridepublic boolean onContextItemSelected(MenuItem item) { // TODO Auto-generated method stubswitch(item.getItemId()){case 1:/** 用户点击了Id为“1”的子项，在这里编写处理代码*/BlooeanMedia();player = MediaPlayer.create(this,R.raw.wintersecret);MediaPlayer(player);Player(player);text.setText("周传雄-冬天的秘密...");break;case 2:/** 用户点击了Id为“2”的子项，在这里编写处理代码*/BlooeanMedia();player = MediaPlayer.create(this, R.raw.after);MediaPlayer(player);Player(player);text.setText("庄心研-以后的以后...");break;case 3:/** 用户点击了Id为“2”的子项，在这里编写处理代码*/BlooeanMedia();player = MediaPlayer.create(this, R.raw.baby);MediaPlayer(player);Player(player);text.setText("张悬-宝贝...");break;case 4:/** 用户点击了Id为“2”的子项，在这里编写处理代码*/BlooeanMedia();player = MediaPlayer.create(this, R.raw.lovegirl);MediaPlayer(player);Player(player);text.setText("张赫宣-你是我心爱的姑娘...");break;case 5:/** 用户点击了Id为“2”的子项，在这里编写处理代码*/Toast.makeText(this, "Item 5被选择",Toast.LENGTH_LONG).show();break;case 6:/** 用户点击了Id为“2”的子项，在这里编写处理代码*/Toast.makeText(this, "Item 6被选择",Toast.LENGTH_LONG).show();break;case 7:/** 用户点击了Id为“2”的子项，在这里编写处理代码*/Toast.makeText(this, "Item 7被选择",Toast.LENGTH_LONG).show();break;case 8:/** 用户点击了Id为“2”的子项，在这里编写处理代码*/Toast.makeText(this, "Item 8被选择",Toast.LENGTH_LONG).show();break;case 9:/** 用户点击了Id为“2”的子项，在这里编写处理代码*/Toast.makeText(this, "Item 9被选择",Toast.LENGTH_LONG).show();break;case 10:/** 用户点击了Id为“2”的子项，在这里编写处理代码*/Toast.makeText(this, "Item 10被选择",Toast.LENGTH_LONG).show();break;}return super.onOptionsItemSelected(item);}private void MediaPlayer(final MediaPlayer player) { // TODO Auto-generated method stub//增加播放音乐按钮的事件btnPlay.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubtry {if(player!=null){if(isPaused==false){player.start();isPaused=true;Toast.makeText(getApplicationContext(), "音乐播放中...", Toast.LENGTH_LONG).show();}else if(isPaused==true){player.pause();//暂停isPaused=false;Toast.makeText(getApplicationContext(), "音乐暂停中...", Toast.LENGTH_LONG).show();}}player.prepare();//同步地准备播放或回放player.start();//开始播放} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}});//播放完毕player.setOnCompletionListener(newMediaPlayer.OnCompletionListener() {@Overridepublic void onCompletion(MediaPlayer arg0) {// TODO Auto-generated method stubtry{//释放dtmimi.mp3这个资源，让它可被其它播放器使用player.release();//释放MediaPlayerToast.makeText(getApplicationContext(), "音乐播放结束!", Toast.LENGTH_LONG).show();text.setText("");}catch(Exception e){Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show();e.printStackTrace();}}});//播放出错的处理player.setOnErrorListener(newMediaPlayer.OnErrorListener() {@Overridepublic boolean onError(MediaPlayer arg0, int arg1, int arg2) {// TODO Auto-generated method stubtry{//发生错误时也释放资源player.release();Toast.makeText(getApplicationContext(), "播放发生异常！", Toast.LENGTH_LONG).show();}catch(Exception e){Toast.makeText(getApplicationContext(),e.toString(), Toast.LENGTH_LONG).show();e.printStackTrace();}return false;}});}@Overridepublic void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {// TODO Auto-generated method stubsuper.onCreateContextMenu(menu, v, menuInfo);menu.add(Menu.NONE, 1, Menu.NONE, "周传雄-冬天的秘密");menu.add(Menu.NONE, 2, Menu.NONE, "庄心研-以后的以后");menu.add(Menu.NONE, 3, Menu.NONE, "张悬-宝贝");menu.add(Menu.NONE, 4, Menu.NONE, "张赫宣-你是我心爱的姑娘");menu.add(Menu.NONE, 5, Menu.NONE, R.string.menu_item5);//将Item6设置为子菜单SubMenu subMenu = menu.addSubMenu(Menu.NONE, 6, Menu.NONE, R.string.menu_item6);subMenu.setHeaderIcon(R.drawable.ic_launcher);subMenu.setIcon(R.drawable.ic_launcher);subMenu.setHeaderTitle("子菜单");subMenu.add(Menu.NONE, 7, Menu.NONE,R.string.menu_item7);subMenu.add(Menu.NONE, 8, Menu.NONE,R.string.menu_item8);subMenu.add(Menu.NONE, 9, Menu.NONE,R.string.menu_item9);subMenu.add(Menu.NONE, 10, Menu.NONE,R.string.menu_item10);}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);if(requestCode==REQUEST_CODE&&resultCode==RESULT_OK){ if(data!=null){//通过data参数处理返回信息String info = data.getData().toString();Uri myUri = Uri.parse(info);//将传回来的路径放在myUri中BlooeanMedia();player = new MediaPlayer();MediaPlayer(player);player.setAudioStreamType(AudioManager.STREAM_MUSIC);try {player.setDataSource(getApplicationContext(),myUri);//按地址播放player.prepare();player.start();isPaused = true;Media=true;Toast.makeText(this, "音乐播放中...", Toast.LENGTH_LONG).show();} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}else{Toast.makeText(this, "无返回信息",Toast.LENGTH_SHORT).show();}}}}package com.anjovo.as.chapter10.exam01;import java.io.File;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.content.Intent;import .Uri;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.EditText;import android.widget.ListView;import android.widget.Toast;/*** 使用一个包含String的List作为ListView的数据源，由于要在匿名内部类的方法中* 使用它，故将其定义为类的属性*/public class newActivity extends Activity{private List<String> dataList;private List<String> datauri;private String m_path;@Overrideprotected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(yout.array_adapter_acyivity);ListView list = (ListView) findViewById(R.id.list);dataList = new ArrayList<String>();datauri = new ArrayList<String>();m_path = new String("mnt/sdcard/");search(m_path, ".mp3", dataList,datauri);//定义一个ArrayAdapter，将数据源——dataList中的内容添加到这个ArrayAdapter//中，第二个参数指每一项将使用的界面布局final ArrayAdapter<String> adapter = newArrayAdapter<String>(this, yout.array_adapter_item, dataList);list.setAdapter(adapter);//将ArrayAdapter填充到ListView//处理用户单击选择的事件list.setOnItemClickListener(newAdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {// TODO Auto-generated method stubIntent intent = new Intent();String url = datauri.get(position);intent.setData(Uri.parse(url));setResult(RESULT_OK, intent);finish();}});//处理用户长按事件list.setOnItemLongClickListener(newAdapterView.OnItemLongClickListener() {@Overridepublic boolean onItemLongClick(AdapterView<?> parent, View view,int position, long id) {// TODO Auto-generated method stubToast.makeText(getApplicationContext(),dataList.get(posit ion)+"删除成功！", Toast.LENGTH_LONG).show();//用户长按一项时，删除这一项内容dataList.remove(position);//通知Adapter的观察者数据源改变了，界面内容也得发生改变adapter.notifyDataSetChanged();return true; //返回true表示长按}});}}布局文件如下：<RelativeLayoutxmlns:android="/apk/res/and roid"xmlns:tools="/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margi n"android:paddingLeft="@dimen/activity_horizontal_margi n"android:paddingRight="@dimen/activity_horizontal_marg in"android:paddingTop="@dimen/activity_vertical_margin"tools:context=".MusicPlayerActivity"><Buttonandroid:id="@+id/bt_pause"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:layout_alignParentLeft="true"android:layout_marginBottom="14dp"android:text="列表"/><Buttonandroid:id="@+id/bt_play"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignBaseline="@+id/bt_pause"android:layout_alignBottom="@+id/bt_pause"android:layout_centerHorizontal="true"android:text="播放"/><Buttonandroid:id="@+id/bt_back"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignLeft="@+id/bt_stop"android:layout_alignParentTop="true"android:text="返回"/><Buttonandroid:id="@+id/bt_stop"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignBaseline="@+id/bt_play"android:layout_alignBottom="@+id/bt_play"android:layout_toRightOf="@+id/image"android:text="选择"/><ImageViewandroid:id="@+id/image"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_above="@+id/text"android:layout_marginBottom="16dp"android:layout_toRightOf="@+id/bt_pause"android:src="@drawable/fengcun"/><TextViewandroid:id="@+id/text"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_above="@+id/bt_play"android:layout_centerHorizontal="true"android:layout_marginBottom="48dp"android:text="."/> </RelativeLayout>。
Androidstudio简单的音乐播放器实现JAVA文件：MainActivity.java，menuActivity.java，Music.java，PreActivity.javaXML文件：activity_main.xml，activity_pre.xml，activity_menu.xml在PreActivity.java文件中，程序主要执行开启线程，实现开启软件进入欢迎界面，并在1秒后自动跳转到音乐播放器主界面，界面在activity_pre.xml文件中实现。
PreActivity.javapublic class PreActivity extends Activity {Handler handler=new Handler(){public void handleMessage(Message msg){if(msg.what==250){Intent intent=new Intent(PreActivity.this,MainActivity.class);startActivity(intent);finish();}};};@Overrideprotected void onCreate(Bundle savedInstanceState){//TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(yout.activity_pre); //加载布局WaitThread thread=new WaitThread(); //开启线程thread.start();}public class WaitThread extends Thread{ //创建线程@Overridepublic void run(){//TODO Auto-generated method stubtry{Thread.sleep(1000);}catch (InterruptedException e){//TODO Auto-generated catch blocke.printStackTrace();}Message message=new Message();message.what=250;message.arg1=1;handler.sendMessage(message);}}}activity_pre.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android=""android:layout_width="400dp"android:layout_height="800dp"android:background="#ffffff"android:orientation="vertical"android:weightSum="1"><ImageViewandroid:src="@drawable/welcome"android:layout_width="408dp"android:layout_height="451dp"android:layout_weight="0.77" /></LinearLayout>主要功能实现MainActivity.java,音乐播放器主界面activity_main.xml。
基于android平台的音乐播放器开发实验报告For personal use only in study and research; not for commercial use学生姓名：温从林学号：0215班级：计自1201第一章引言1.1 项目背景当今社会的生活节奏越来越快，人们对手机的要求也越来越高，由于手机市场发展迅速，使得手机操作系统也出现了不同各类，现在的市场上主要有三个手机操作系统，Windows mobile，symbian，以及谷歌的Android操作系统，其中占有开放源代码优势的Android系统有最大的发展前景。
那么能否在手机上拥有自己编写的个性音乐播放器呢？能的，谷歌Android系统就能做到。
本文的音乐播放器就是基于谷歌Android手机平台的播放器。
Android：是谷歌于2007年公布的开放式源代码手机系统，它的开放性就优于其它封闭式的手机系统，因此，任何人都可能根据自己的喜好将手机系统中的所有功能重新编写。
这使得越来越多的人关注这个操作系统。
本次作品音乐播放器就是基于Android平台的。
1.2 编写目的现今社会生活紧张，而欣赏音乐是其中最好的舒缓压力的方式之一，本项目的目的是开发一个可以播放主流音乐文件格式的播放器，本设计实现的主要功能是播放Mp3，Wav多种格式的音乐文件，并且能够控制播放，暂停，停止，播放列等基本播放控制功能，界面简明，操作简单。
本项目是一款基于Android手机平台的音乐播放器，使Android手机拥有个性的多媒体播放器，使手机显得更生动灵活化，与人们更为接近，让手机主人随时随地处于音乐视频的旋律之中。
使人们的生活更加多样化。
也使设计者更加熟练Android的技术和其它在市场上的特点。
1.3 开发环境Eclipse、Android SDK 3.2.0第二章系统需求分析2.1 功能需求（用例图分析）根据项目的目标，我们可获得项目系统的基本需求，以下从不同角度来描述系统的需求，并且使用用例图来描述，系统的功能需求，我们分成四部分来概括，即播放器的基本控制需要，播放列表管理需求，播放器友好性需求和播放器扩展卡需求。
MusicInfoController.javapackage com.yarin.android.MusicPlayer;import android.content.ContentResolver;import android.database.Cursor;import .Uri;import android.provider.MediaStore;public class MusicInfoController{private static MusicInfoController mInstance = null;private MusicPlayerApp pApp = null;public static MusicInfoController getInstance(MusicPlayerApp app){if (mInstance == null){mInstance = new MusicInfoController(app);}return mInstance;}private MusicInfoController(MusicPlayerApp app){pApp = app;}public MusicPlayerApp getMusicPlayer(){return pApp;}private Cursor query(Uri uri, String[] prjs, String selections, String[] selectArgs, String order){ ContentResolver resolver = pApp.getContentResolver();if (resolver == null){return null;}return resolver.query(uri, prjs, selections, selectArgs, order);}public Cursor getAllSongs(){return query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);MusicList.javapackage com.yarin.android.MusicPlayer;import android.app.ListActivity;import android.content.BroadcastReceiver;import ponentName;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.ServiceConnection;import android.database.Cursor;import android.os.Bundle;import android.os.IBinder;import android.provider.MediaStore;import android.view.View;import android.widget.Button;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.SimpleCursorAdapter;import android.widget.T extView;public class MusicList extends ListActivity{private MusicPlayerService mMusicPlayerService = null;private MusicInfoController mMusicInfoController = null;private Cursor mCursor = null;private TextView mTextView = null;private Button mPlayPauseButton = null;private Button mStopButton = null;private ServiceConnection mPlaybackConnection = new ServiceConnection() { public void onServiceConnected(ComponentName className, IBinder service) { mMusicPlayerService = ((MusicPlayerService.LocalBinder)service).getService();}public void onServiceDisconnected(ComponentName className){ mMusicPlayerService = null;}};protected BroadcastReceiver mPlayerEvtReceiver = new BroadcastReceiver() { @Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (action.equals(MusicPlayerService.PLAYER_PREPARE_END)) {// will begin to playmTextView.setVisibility(View.INVISIBLE); mPlayPauseButton.setVisibility(View.VISIBLE);mStopButton.setVisibility(View.VISIBLE);mPlayPauseButton.setText(R.string.pause);} else if(action.equals(MusicPlayerService.PLAY_COMPLETED)){ mPlayPauseButton.setText(R.string.play);}}};public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(yout.list_layout);MusicPlayerApp musicPlayerApp=(MusicPlayerApp)getApplication(); mMusicInfoController =(musicPlayerApp).getMusicInfoController();// bind playback servicestartService(new Intent(this,MusicPlayerService.class));bindService(new Intent(this,MusicPlayerService.class), mPlaybackConnection,Context.BIND_AUTO_CREATE);mTextView = (TextView)findViewById(R.id.show_text); mPlayPauseButton = (Button)findViewById(R.id.play_pause_btn); mStopButton = (Button) findViewById(R.id.stop_btn);mPlayPauseButton.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {// Perform action on clickif (mMusicPlayerService != null && mMusicPlayerService.isPlaying()) { mMusicPlayerService.pause();mPlayPauseButton.setText(R.string.play);} else if (mMusicPlayerService != null){mMusicPlayerService.start();mPlayPauseButton.setText(R.string.pause);}}});mStopButton.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {// Perform action on clickif (mMusicPlayerService != null ) {mTextView.setVisibility(View.VISIBLE);mPlayPauseButton.setVisibility(View.INVISIBLE);mStopButton.setVisibility(View.INVISIBLE); mMusicPlayerService.stop();}}});IntentFilter filter = new IntentFilter();filter.addAction(MusicPlayerService.PLAYER_PREPARE_END);filter.addAction(MusicPlayerService.PLAY_COMPLETED);registerReceiver(mPlayerEvtReceiver, filter);}protected void onResume() {super.onResume();mCursor = mMusicInfoController.getAllSongs();ListAdapter adapter = new MusicListAdapter(this,yout.simple_expandable_list_item_2, mCursor, new String[]{}, new int[]{});setListAdapter(adapter);}protected void onListItemClick(ListView l, View v, int position, long id) {super.onListItemClick(l, v, position, id);if (mCursor == null ||mCursor.getCount() == 0) {return;}mCursor.moveToPosition(position);String url = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));mMusicPlayerService.setDataSource(url);mMusicPlayerService.start();}/********************************************************************/class MusicListAdapter extends SimpleCursorAdapter {public MusicListAdapter(Context context, int layout, Cursor c,String[] from, int[] to) { super(context, layout, c, from, to);}public void bindView(View view, Context context, Cursor cursor) {super.bindView(view, context, cursor);TextView titleView = (TextView) view.findViewById(android.R.id.text1);TextView artistView = (TextView) view.findViewById(android.R.id.text2);titleView.setText(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE)));artistView.setText(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST)));//int duration cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));}public static String makeTimeString(long milliSecs) {StringBuffer sb = new StringBuffer();long m = milliSecs / (60 * 1000);sb.append(m < 10 ? "0" + m : m);sb.append(":");long s = (milliSecs % (60 * 1000)) / 1000;sb.append(s < 10 ? "0" + s : s);return sb.toString();}MusicPlayerApp.java package com.yarin.android.MusicPlayer;import android.app.Application;public class MusicPlayerApp extends Application{private MusicInfoController mMusicInfoController = null;public void onCreate(){ super.onCreate();mMusicInfoController = MusicInfoController.getInstance(this); }public MusicInfoController getMusicInfoController(){return mMusicInfoController;}}MusicPlayerService.javapackage com.yarin.android.MusicPlayer;import java.io.IOException;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.os.Binder;import android.os.IBinder;public class MusicPlayerService extends Service{private final IBinder mBinder = new LocalBinder();private MediaPlayer mMediaPlayer = null;public static final String PLAYER_PREPARE_END = "com.yarin.musicplayerservice.prepared";public static final String PLAY_COMPLETED = "com.yarin.musicplayerservice.playcompleted";MediaPlayer.OnCompletionListener mCompleteListener = new MediaPlayer.OnCompletionListener(){public void onCompletion(MediaPlayer mp){ broadcastEvent(PLAY_COMPLETED);}};MediaPlayer.OnPreparedListener mPrepareListener = new MediaPlayer.OnPreparedListener(){public void onPrepared(MediaPlayer mp){ broadcastEvent(PLAYER_PREPARE_END);}};private void broadcastEvent(String what){Intent i = new Intent(what); sendBroadcast(i);}public void onCreate(){super.onCreate();mMediaPlayer = new MediaPlayer(); mMediaPlayer.setOnPreparedListener(mPrepareListener);mMediaPlayer.setOnCompletionListener(mCompleteListener);}public class LocalBinder extends Binder{public MusicPlayerService getService(){return MusicPlayerService.this;public IBinder onBind(Intent intent){return mBinder;}public void setDataSource(String path){try{mMediaPlayer.reset();mMediaPlayer.setDataSource(path); mMediaPlayer.prepare();}catch (IOException e){return;}catch (IllegalArgumentException e){return;}}public void start(){mMediaPlayer.start();}public void stop(){mMediaPlayer.stop();}public void pause(){mMediaPlayer.pause();public boolean isPlaying(){return mMediaPlayer.isPlaying();}public int getDuration(){return mMediaPlayer.getDuration();}public int getPosition(){return mMediaPlayer.getCurrentPosition();}public long seek(long whereto){mMediaPlayer.seekTo((int) whereto);return whereto;}}。
广州xx 学院Android 程序设计 实验报告专业班级 计算机181 实验日期__ 2021.5.18_ _ 姓 名 xx 学 号201xx 实验名称 Service 编程 指导老师__ xx _（报告内容包括：实验目的、实验设备及器材、实验步骤、实验数据、图表及曲线处理、实验小结等）。
1. 实验目的(1) 了解如何创建服务；(2) 掌握服务的两种启动方式；(3) 掌握如何使用本地服务通信。
2. 实验要求(1) 使用服务通信，实现音乐播放器功能，实现音乐的播放、暂停、继续播放、退出。
3. 实验步骤（1）导入音乐文件和界面图片之后，开始创建布局，代码如下，效果图如图1-1所示。
<ImageViewandroid :id ="@+id/iv_music"android :layout_width ="240dp"android :layout_height ="240dp"android :layout_gravity ="center_horizontal" android :layout_margin ="15dp"android :src ="@drawable/music"/><SeekBarandroid :id ="@+id/sb"android :layout_width ="match_parent"android :layout_height ="wrap_content" /><RelativeLayoutandroid :layout_width ="match_parent"android :layout_height ="wrap_content"android:paddingLeft="8dp"android:paddingRight="8dp"><TextViewandroid:id="@+id/tv_progress"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="00:00" /><TextViewandroid:id="@+id/tv_total"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentRight="true"android:text="00:00" /></RelativeLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"><Buttonandroid:id="@+id/btn_play"android:layout_width="0dp"android:layout_height="40dp"android:layout_margin="8dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="播放音乐" /><Buttonandroid:id="@+id/btn_pause"android:layout_width="0dp"android:layout_height="40dp"android:layout_margin="8dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="暂停播放" /><Buttonandroid:id="@+id/btn_continue_play"android:layout_width="0dp"android:layout_height="40dp"android:layout_margin="8dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="继续播放" /><Buttonandroid:id="@+id/btn_exit"android:layout_width="0dp"android:layout_height="40dp"android:layout_margin="8dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="退出" /></LinearLayout>图1-1 界面布局效果图（2）创建背景选择器btn_bg_selector.xml关键代码如下：<selector xmlns:android="/apk/res/android"><item android:state_pressed="true" ><shape android:shape="rectangle"><corners android:radius="3dp"/><solid android:color="#d4d4d4"/></shape></item><item android:state_pressed="false" ><shape android:shape="rectangle"><corners android:radius="3dp"/><solid android:color="#ffffff" /></shape></item></selector>（3）创建MusicService服务关键代码如下所示：public class MusicService extends Service {private MediaPlayer player;private Timer timer;public MusicService() {}@Overridepublic IBinder onBind(Intent intent) {return new MusicControl();}@Overridepublic void onCreate() {super.onCreate();player = new MediaPlayer();//创建音乐播放器对象}public void addTimer() { //添加计时器用于设置音乐播放器中的播放进度条if (timer == null) {timer = new Timer(); //创建计时器对象TimerTask task = new TimerTask() {@Overridepublic void run() {if (player == null) return;int duration = player.getDuration(); //获取歌曲总时长int currentPosition = player.getCurrentPosition();//获取播放进度Message msg = MainActivity.handler.obtainMessage();//创建消息对象//将音乐的总时长和播放进度封装至消息对象中Bundle bundle = new Bundle();bundle.putInt("duration", duration);bundle.putInt("currentPosition", currentPosition);msg.setData(bundle);//将消息发送到主线程的消息队列MainActivity.handler.sendMessage(msg);}};//开始计时任务后的5毫秒，第一次执行task任务，以后每500毫秒执行一次timer.schedule(task, 5, 500);}}class MusicControl extends Binder {public void play() {try {player.reset();//重置音乐播放器//加载多媒体文件player = MediaPlayer.create(getApplicationContext(),R.raw.music);player.start();//播放音乐addTimer(); //添加计时器} catch (Exception e) {e.printStackTrace();}}public void pausePlay() {player.pause(); //暂停播放音乐}public void continuePlay() {player.start(); //继续播放音乐}public void seekTo(int progress) {player.seekTo(progress);//设置音乐的播放位置}}@Overridepublic void onDestroy() {super.onDestroy();if (player == null) return;if (player.isPlaying()) player.stop();//停止播放音乐player.release(); //释放占用的资源player = null; //将player置为空}}（4）编写界面交互代码关键代码如下：public class MainActivity extends AppCompatActivity implementsView.OnClickListener{private static SeekBar sb;private static TextView tv_progress, tv_total;private ObjectAnimator animator;private MusicService.MusicControl musicControl;MyServiceConn conn;Intent intent;private boolean isUnbind = false;//记录服务是否被解绑@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(yout.activity_main);init();}private void init() {tv_progress = (TextView) findViewById(_progress);tv_total = (TextView) findViewById(_total);sb = (SeekBar) findViewById(R.id.sb);findViewById(R.id.btn_play).setOnClickListener(this);findViewById(R.id.btn_pause).setOnClickListener(this);findViewById(R.id.btn_continue_play).setOnClickListener(this);findViewById(R.id.btn_exit).setOnClickListener(this);intent = new Intent(this, MusicService.class);//创建意图对象conn = new MyServiceConn();//创建服务连接对象bindService(intent, conn, BIND_AUTO_CREATE); //绑定服务//为滑动条添加事件监听sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, booleanfromUser) { //滑动条进度改变时，会调用此方法if (progress == seekBar.getMax()) { //当滑动条滑到末端时，结束动画animator.pause(); //停止播放动画}}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {//滑动条开始滑动时调用}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) { //滑动条停止滑动时调用//根据拖动的进度改变音乐播放进度int progress = seekBar.getProgress();//获取seekBar的进度musicControl.seekTo(progress); //改变播放进度}});ImageView iv_music = (ImageView) findViewById(R.id.iv_music);animator = ObjectAnimator.ofFloat(iv_music, "rotation", 0f, 360.0f);animator.setDuration(10000); //动画旋转一周的时间为10秒animator.setInterpolator(new LinearInterpolator());animator.setRepeatCount(-1); //-1表示设置动画无限循环}4.运行结果开始播放如图4-1所示图4-15.实验小结通过此次实验，让我了解到了Android中的服务创建，比如下载文件、播放音乐等功能，其中让我学到了一个背景选择器，可以通过这个选择器动态呈现按钮的背景颜色。
Android简易⾳乐播放器实现代码本⽂实例为⼤家分享了Android⾳乐播放器的具体代码，供⼤家参考，具体内容如下1.播放项⽬内的⾳乐package com.thm.g150820_android26_playmusic;import Android.media.MediaPlayer;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageButton;import android.widget.SeekBar;public class MainActivity extends AppCompatActivity {private MediaPlayer mediaPlayer;private SeekBar seekBar;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(yout.activity_main);seekBar = (SeekBar) findViewById(R.id.seekBar);seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {//获取拖动结束之后的位置int progress = seekBar.getProgress();//跳转到某个位置播放mediaPlayer.seekTo(progress);}});}public void isPlayOrPause(View view){//把View强转为ImageButtonImageButton imageButton = (ImageButton) view;if(mediaPlayer==null) {//实例化MediaPlayermediaPlayer = MediaPlayer.create(this, R.raw.yao);//开始播放mediaPlayer.start();//图标修改为暂停的图标imageButton.setImageResource(android.R.drawable.ic_media_pause);//获取⾳乐的总时长int duration = mediaPlayer.getDuration();//设置进度条的最⼤值为⾳乐的总时长seekBar.setMax(duration);new MyThre().start();}//判断如果⾳乐在播放else if(mediaPlayer.isPlaying()){//就暂停⾳乐mediaPlayer.pause();//图标修改为播放的图标imageButton.setImageResource(android.R.drawable.ic_media_play);}else{mediaPlayer.start();//图标修改为暂停的图标imageButton.setImageResource(android.R.drawable.ic_media_pause);}}//写内部类class MyThre extends Thread{@Overridepublic void run() {super.run();while(seekBar.getProgress()<=seekBar.getMax()){//获取当前⾳乐播放的位置int currentPosition = mediaPlayer.getCurrentPosition();//让进度条动起来seekBar.setProgress(currentPosition);}}}}2.播放内存卡中的⾳乐package com.thm.g150820_android26_playmusic;import android.media.AudioManager;import android.media.MediaPlayer;import .Uri;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageButton;import android.widget.SeekBar;import java.io.IOException;public class MainActivity extends AppCompatActivity {private MediaPlayer mediaPlayer;private SeekBar seekBar;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(yout.activity_main);seekBar = (SeekBar) findViewById(R.id.seekBar);seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { }@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {//获取拖动结束之后的位置int progress = seekBar.getProgress();//跳转到某个位置播放mediaPlayer.seekTo(progress);}});}public void isPlayOrPause(View view){//把View强转为ImageButtonImageButton imageButton = (ImageButton) view;if(mediaPlayer==null) {//实例化MediaPlayer//播放应⽤内的⾳乐//mediaPlayer = MediaPlayer.create(this, R.raw.yao);//播放内存卡中的⾳乐mediaPlayer = new MediaPlayer();//设置类型mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);//设置⾳乐路径try {mediaPlayer.setDataSource(this, Uri.parse("storage/sdcard0/Music/a.mp3"));//播放之前准备⼀下mediaPlayer.prepare();} catch (IOException e) {e.printStackTrace();}//开始播放mediaPlayer.start();//图标修改为暂停的图标imageButton.setImageResource(android.R.drawable.ic_media_pause);//获取⾳乐的总时长int duration = mediaPlayer.getDuration();//设置进度条的最⼤值为⾳乐的总时长seekBar.setMax(duration);new MyThre().start();}//判断如果⾳乐在播放else if(mediaPlayer.isPlaying()){//就暂停⾳乐mediaPlayer.pause();//图标修改为播放的图标imageButton.setImageResource(android.R.drawable.ic_media_play);}else{mediaPlayer.start();//图标修改为暂停的图标imageButton.setImageResource(android.R.drawable.ic_media_pause);}}//写线程内部类class MyThre extends Thread{@Overridepublic void run() {super.run();while(seekBar.getProgress()<=seekBar.getMax()){//获取当前⾳乐播放的位置int currentPosition = mediaPlayer.getCurrentPosition();//让进度条动起来seekBar.setProgress(currentPosition);}}}}3.添加读取内存的权限更多关于播放器的内容请点击进⾏学习。
最全的Android开源音乐播放器源码汇总收集了很多音乐播放器类的Android项目源码，非常不错的开源项目，会让你事半功倍，希望大家补充。
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Android 音乐播放器（晴天播放）Android优雅音乐源码Android MusicPlayer音乐播放器源码Android 简易音乐播放器源码GitHub开源项目之Jamendo音乐播放器Android音乐播放器歌词显示实例。
Android应⽤开发--MP3⾳乐播放器代码实现（⼀）需求1：将内存卡中的MP3⾳乐读取出来并显⽰到列表当中1. 从数据库中查询所有⾳乐数据，保存到List集合当中，List当中存放的是Mp3Info对象2. 迭代List集合，把每⼀个Mp3Info对象的所有属性，保存到Map对象当中3. 定义⼀个List集合，把Map对象添加到List集合当中4. 通过定义⼀个SimpleAdpter,调⽤setAdpter⽅法，将数据显⽰到列表当中[java]1. /**2. * ⽤于从数据库中查询歌曲的信息，保存在List当中3. *4. * @return5. */6. public List<Mp3Info> getMp3Infos() {7. Cursor cursor = getContentResolver().query(8. MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,9. MediaStore.Audio.Media.DEFAULT_SORT_ORDER);10. List<Mp3Info> mp3Infos = new ArrayList<Mp3Info>();11. for (int i = 0; i < cursor.getCount(); i++) {12. Mp3Info mp3Info = new Mp3Info();13. cursor.moveToNext();14. long id = cursor.getLong(cursor15. .getColumnIndex(MediaStore.Audio.Media._ID)); //⾳乐id16. String title = cursor.getString((cursor17. .getColumnIndex(MediaStore.Audio.Media.TITLE)));//⾳乐标题18. String artist = cursor.getString(cursor19. .getColumnIndex(MediaStore.Audio.Media.ARTIST));//艺术家20. long duration = cursor.getLong(cursor21. .getColumnIndex(MediaStore.Audio.Media.DURATION));//时长22. long size = cursor.getLong(cursor23. .getColumnIndex(MediaStore.Audio.Media.SIZE)); //⽂件⼤⼩24. String url = cursor.getString(cursor25. .getColumnIndex(MediaStore.Audio.Media.DATA)); //⽂件路径26. int isMusic = cursor.getInt(cursor27. .getColumnIndex(MediaStore.Audio.Media.IS_MUSIC));//是否为⾳乐28. if (isMusic != 0) { //只把⾳乐添加到集合当中29. mp3Info.setId(id);30. mp3Info.setTitle(title);31. mp3Info.setArtist(artist);32. mp3Info.setDuration(duration);33. mp3Info.setSize(size);34. mp3Info.setUrl(url);35. mp3Infos.add(mp3Info);36. }37. }38. return mp3Infos;39. }[java]1. /**2. * 填充列表3. * @param mp3Infos4. */5. public void setListAdpter(List<Mp3Info> mp3Infos) {6. List<HashMap<String, String>> mp3list = new ArrayList<HashMap<String, String>>();7. for (Iterator iterator = mp3Infos.iterator(); iterator.hasNext();) {8. Mp3Info mp3Info = (Mp3Info) iterator.next();9. HashMap<String, String> map = new HashMap<String, String>();10. map.put("title", mp3Info.getTitle());11. map.put("Artist", mp3Info.getArtist());12. map.put("duration", String.valueOf(mp3Info.getDuration()));13. map.put("size", String.valueOf(mp3Info.getSize()));14. map.put("url", mp3Info.getUrl());15. mp3list.add(map);16. }17. mAdapter = new SimpleAdapter(this, mp3list,18. yout.music_list_item_layout, new String[] { "title", "Artist", "duration" },19. new int[] { R.id.music_title, R.id.music_Artist, R.id.music_duration });20. mMusiclist.setAdapter(mAdapter);21. }实现效果如图：需求2：点击列表的每⼀项，启动⼀个服务来播放⾳乐1. 注册条⽬点击监听器OnItemClickListener2. 定义⼀个实现OnItemClickListener接⼝的内部类3. 定义⼀个继承Service的服务类PlayerServie1. 注册条⽬点击监听器OnItemClickListener[java]1. mMusiclist = (ListView) findViewById(R.id.music_list);2. mMusiclist.setOnItemClickListener(new MusicListItemClickListener());3. mp3Infos = getMp3Infos();4. setListAdpter(getMp3Infos());2. 定义⼀个实现OnItemClickListener接⼝的内部类[java]1. private class MusicListItemClickListener implements OnItemClickListener {2. @Override3. public void onItemClick(AdapterView<?> parent, View view, int position,4. long id) {5. if(mp3Infos != null) {6. Mp3Info mp3Info = mp3Infos.get(position);7. Log.d("mp3Info-->", mp3Info.toString());8. Intent intent = new Intent();9. intent.putExtra("url", mp3Info.getUrl());10. intent.putExtra("MSG", AppConstant.PlayerMsg.PLAY_MSG);11. intent.setClass(MainActivity.this, PlayerService.class);12. startService(intent); //启动服务13. }14. }15. }3. 定义⼀个继承Service的服务类PlayerServie（未完善的Service类）[java]1. package com.wwj.sb.service;2.3.4. import android.annotation.SuppressLint;5. import android.app.Service;6. import android.content.Intent;7. import android.media.MediaPlayer;8. import android.media.MediaPlayer.OnPreparedListener;9. import android.os.IBinder;10.11. import com.wwj.sb.domain.AppConstant;12.13. @SuppressLint("NewApi")14. public class PlayerService extends Service {15. private MediaPlayer mediaPlayer = new MediaPlayer(); //媒体播放器对象16. private String path; //⾳乐⽂件路径17. private boolean isPause; //暂停状态18.19. @Override20. public IBinder onBind(Intent arg0) {21. return null;22. }23.24. @Override25. public int onStartCommand(Intent intent, int flags, int startId) {26. if(mediaPlayer.isPlaying()) {27. stop();28. }29. path = intent.getStringExtra("url");30. int msg = intent.getIntExtra("MSG", 0);31. if(msg == AppConstant.PlayerMsg.PLAY_MSG) {32. play(0);33. } else if(msg == AppConstant.PlayerMsg.PAUSE_MSG) {34. pause();35. } else if(msg == AppConstant.PlayerMsg.STOP_MSG) {36. stop();37. }38. return super.onStartCommand(intent, flags, startId);39. }40.41.42. /**43. * 播放⾳乐44. * @param position45. */46. private void play(int position) {47. try {48. mediaPlayer.reset();//把各项参数恢复到初始状态49. mediaPlayer.setDataSource(path);50. mediaPlayer.prepare(); //进⾏缓冲51. mediaPlayer.setOnPreparedListener(new PreparedListener(position));//注册⼀个监听器52. }53. catch (Exception e) {54. e.printStackTrace();55. }56. }57.58. /**59. * 暂停⾳乐60. */61. private void pause() {62. if (mediaPlayer != null && mediaPlayer.isPlaying()) {63. mediaPlayer.pause();64. isPause = true;65. }66. }67.68. /**69. * 停⽌⾳乐70. */71. private void stop(){72. if(mediaPlayer != null) {73. mediaPlayer.stop();74. try {75. mediaPlayer.prepare(); // 在调⽤stop后如果需要再次通过start进⾏播放,需要之前调⽤prepare函数76. } catch (Exception e) {77. e.printStackTrace();78. }79. }80. }81.82.83. @Override84. public void onDestroy() {85. if(mediaPlayer != null){86. mediaPlayer.stop();87. mediaPlayer.release();88. }89. }90. /**91. *92. * 实现⼀个OnPrepareLister接⼝,当⾳乐准备好的时候开始播放93. *94. */95. private final class PreparedListener implements OnPreparedListener {96. private int positon;97.98. public PreparedListener(int positon) {99. this.positon = positon;100. }101.102. @Override103. public void onPrepared(MediaPlayer mp) {104. mediaPlayer.start(); //开始播放105. if(positon > 0) { //如果⾳乐不是从头播放106. mediaPlayer.seekTo(positon);107. }108. }109. }110.111. }public class MusicActivity extends Activity {private boolean isStop = false;private MediaPlayer mPlayer;public final String TITLE = Environment.getExternalStorageDirectory()+ "/iwantyourlove.mp3";private File file;private SeekBar seekBar;private ImageView play;private TextView title;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(yout.music_main);initWidgets();}// 重新初始化播放器public void initWidgets() {play = (ImageView) findViewById(R.id.img_stop);title = (TextView) findViewById(R.id.title);seekBar = (SeekBar) findViewById(R.id.seek);seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Overridepublic void onStopTrackingTouch(SeekBar seekBar) {//seekBar.setProgress(mPlayer.getCurrentPosition() *seekBar.getMax() / total); //Log.i("sss", seekBar.getProgress()+"");//mPlayer.seekTo(mPlayer.getCurrentPosition());mPlayer.seekTo(seekBar.getProgress() * mPlayer.getDuration() /100 );}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// Log.i("progress", ""+progress);// Log.i("qqq", seekBar.getProgress()+"");// progress = currentPosition * 100 / duration;//progress*duration/100//mPlayer.seekTo(progress * mPlayer.getDuration() /100 );}});file = new File(TITLE);title.setText(file.getName());mPlayer = new MediaPlayer();try {mPlayer.setDataSource(TITLE);mPlayer.prepare();} catch (Exception e) {e.printStackTrace();}}public void play(View v) {if (!mPlayer.isPlaying()) {mPlayer.start();}}public void pause(View v) {if (mPlayer.isPlaying()) {mPlayer.pause();}}public void replay(View v) {mPlayer.reset();initWidgets();// 重新构建播放器// mPlayer.start();play(v);}public void stop(View v) {isStop = true;mPlayer.stop();play.setImageResource(R.drawable.player_play);}// ⽤图⽚代替按钮public void playOrPause(View v) {if (isStop) {// 停⽌后重新开始播放mPlayer.reset();initWidgets();mPlayer.start();play.setImageResource(R.drawable.player_pause);isStop = false;} else if (mPlayer.isPlaying()) {// 播放状态play.setImageResource(R.drawable.player_play);mPlayer.pause();} else {// 暂停状态play.setImageResource(R.drawable.player_pause);mPlayer.start();}// 异步任务new MusicTask().execute();}@Overrideprotected void onDestroy() {super.onDestroy();// 释放资源mPlayer.release();}// ⾳乐播放异步任务class MusicTask extends AsyncTask<Void, Void, Void> {//int current = mPlayer.getCurrentPosition();// 当前播放是什么位置，int total = mPlayer.getDuration(); // ⾳乐总共多长时间@Overrideprotected Void doInBackground(Void... params) {// 让SeekBar跟着⾳乐⼀起向右边⾛while (mPlayer.getCurrentPosition() <= total&&!isStop) { //!isPause不是停⽌状态try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}publishProgress();}return null;}@Overrideprotected void onProgressUpdate(Void... values) {super.onProgressUpdate(values);// Log.i("msg", ""+mPlayer.getCurrentPosition() * 100 / total);seekBar.setProgress(mPlayer.getCurrentPosition() *seekBar.getMax() / total); }@Overrideprotected void onPostExecute(Void result) {super.onPostExecute(result);}}}。
1. Mp3Player.java 文件package com.jacky.multimedia;import java.io.File;import java.io.FilenameFilter;import java.io.IOException;import java.util.ArrayList;import java.util.List;import android.app.ListActivity;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.Bundle;import android.os.Handler;import android.view.KeyEvent;import android.view.View;import android.widget.ArrayAdapter;import android.widget.ImageButton;import android.widget.ListView;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;import android.widget.TextView;public class Mp3Player extends ListActivity {/** Called when the activity is first created. *//* 定义5个图像按钮*/private ImageButton mFrontImageButton = null;private ImageButton mStartImageButton = null;private ImageButton mPauseImageButton = null;private ImageButton mStopImageButton = null;private ImageButton mNextImageButton = null;/*定义进度handler，显示百分比进度*/Handler mPercentHandler = new Handler();/*定义拖动条*/private SeekBar mSeekBar=null;/*定义显示文本框*/private TextView curProgressText=null;private TextView curtimeAndTotaltime=null;/* 定于一个多媒体对象*/public MediaPlayer mMediaPlayer = 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*/private List<String> mMusicList = new ArrayList<String>();/* 定义在播放列表中的当前选择项*/private int currentListItme = 0;/*定义要播放的文件夹路径*/private static final String MUSIC_PATH = new String("/mnt/sdcard/");/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(yout.main);/* 更新播放列表*/musicList();/*初始化多媒体对象*/mMediaPlayer = new MediaPlayer();/*初始化图像按钮*/mFrontImageButton = (ImageButton) findViewById(stImageButton); mStopImageButton = (ImageButton) findViewById(R.id.StopImageButton); mStartImageButton = (ImageButton) findViewById(R.id.StartImageButton); mPauseImageButton = (ImageButton) findViewById(R.id.PauseImageButton); 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.setOnClickListener(new ImageButton.OnClickListener() {@Overridepublic void onClick(View v){/*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(new ImageButton.OnClickListener(){@Overridepublic void onClick(View v){ /*播放当前选择歌曲，通过listView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(new ImageButton.OnClickListener(){public void onClick(View view){if (mMediaPlayer.isPlaying()){/*如果有播放歌曲，暂停*/mMediaPlayer.pause();}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(new ImageButton.OnClickListener(){@Overridepublic void onClick(View arg0){nextMusic();}/*监听上一首按钮*/mFrontImageButton.setOnClickListener(new ImageButton.OnClickListener() {@Overridepublic void onClick(View arg0){FrontMusic();}});/*监听拖动条*/mSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stub/*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);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubcurProgressText.setText("拖动中...");}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubint dest = seekBar.getProgress();int mMax = mMediaPlayer.getDuration();int sMax = 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*/public boolean onKeyDown(int keyCode, KeyEvent event){if ( keyCode == KeyEvent.KEYCODE_BACK){mMediaPlayer.stop();mMediaPlayer.release();this.finish();return true;}return super.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*/protected void onListItemClick(ListView l, View v, int position, long id){currentListItme = position;playMusic(MUSIC_PATH + mMusicList.get(position));}/*更新播放列表*/public void musicList(){/*从指定的路径中读取文件，并与播放列表关联*/File home = new File(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(new MusicFilter()).length > 0){/*读取文件*/for (File file : home.listFiles(new MusicFilter())){mMusicList.add(file.getName());}/*播放文件与播放列表关联*/ArrayAdapter<String> musicList = new ArrayAdapter<String>(Mp3Player.this,yout.musicitme, mMusicList); setListAdapter(musicList);}}/*播放指定路径中的音乐*/private void playMusic(String path){{/* 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.start();/*监听播放是否完成*/mMediaPlayer.setOnCompletionListener(new OnCompletionListener() {public void onCompletion(MediaPlayer arg0){/*播放完当前歌曲，自动播放下一首*/nextMusic();}});}catch (IOException e){}}/*播放下一首*/private void nextMusic(){if (++currentListItme >= mMusicList.size()){currentListItme = 0;}else{playMusic(MUSIC_PATH + mMusicList.get(currentListItme));}}/*播放上一首歌曲*/private void FrontMusic(){if (--currentListItme >= 0){currentListItme = 0;}{playMusic(MUSIC_PATH + mMusicList.get(currentListItme));}}/*更新拖动条进度*/public void startSeekBarUpdate(){mPercentHandler.post(start);}Runnable start=new Runnable(){@Overridepublic void run() {// TODO Auto-generated method stubmPercentHandler.post(updatesb);//用一个handler更新SeekBar}};Runnable updatesb =new Runnable(){@Overridepublic void run() {// TODO Auto-generated method stubint position = mMediaPlayer.getCurrentPosition();int mMax = mMediaPlayer.getDuration();int sMax = mSeekBar.getMax();mSeekBar.setProgress(position*sMax/mMax);curtimeAndTotaltime.setT ext("当前播放时间："+position/1000+"秒"+"\n歌曲总时间: "+mMax/1000+"秒");mPercentHandler.postDelayed(updatesb, 1000);//每秒钟更新一次}};}/*播放文件选择类*/class MusicFilter implements FilenameFilter{public boolean accept(File dir, String name){/*指定扩展名类型*/return (name.endsWith(".mp3"));}}2.main.xls文件<?xml version="1.0" encoding="utf-8"?><AbsoluteLayoutxmlns:android="/apk/res/android" android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><ListViewandroid:id="@id/android:list"android:layout_width="fill_parent"android:layout_height="fill_parent"android:layout_weight="1"android:drawSelectorOnT op="false"/><ImageButtonandroid:id="@+id/LastImageButton"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_x="10px"android:layout_y="70px"android:src="@drawable/last"/><ImageButtonandroid:id="@+id/StopImageButton"android:layout_height="wrap_content"android:layout_width="wrap_content"android:layout_x="70px"android:layout_y="70px"android:src="@drawable/stop"/><ImageButtonandroid:id="@+id/StartImageButton"android:layout_height="wrap_content"android:layout_width="wrap_content"android:layout_x="130px"android:layout_y="70px"android:src="@drawable/start"/><ImageButtonandroid:id="@+id/PauseImageButton"android:layout_height="wrap_content"android:layout_width="wrap_content"android:layout_x="190px"android:layout_y="70px"android:src="@drawable/pause"/><ImageButtonandroid:id="@+id/NextImageButton"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_x="250px"android:layout_y="70px"android:src="@drawable/next"/><SeekBar android:id="@+id/SeekBar01"android:layout_height="wrap_content"android:layout_x="0dp"android:layout_y="200dp"android:layout_width="fill_parent"android:max="100"android:progress="0"android:secondaryProgress="50"android:visibility="visible"></SeekBar><TextView android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_y="250dp" android:id="@+id/currentProgress"></TextView><TextView android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_y="300dp" android:id="@+id/curtimeandtotaltime"></TextView></AbsoluteLayout>3.musictime.xls<?xml version="1.0" encoding="utf-8"?><TextView xmlns:android="/apk/res/android" android:id="@+id/T extView01"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/hello"/>4.AndroidManifest.xls<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="/apk/res/android" package="com.jacky.multimedia"android:versionCode="1"android:versionName="1.0"><application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Mp3Player"android:label="@string/app_name"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="UNCHER" /></intent-filter></activity></application><uses-sdk android:minSdkVersion="3" /></manifest>。
目录第一章引言................................................................................................... - 1 -1.1 项目背景............................................................................................ - 1 -1.2 编写目的............................................................................................ - 2 -1.3 参考资料............................................................... 错误！未定义书签。
第二章系统需求分析..................................................................................... - 3 -2.1 功能需求（用例图分析）................................................................ - 3 -2.1.1 播放器的基本控制需求......................................................... - 3 -2.1.2 播放清单列表管理需求......................................................... - 5 -2.1.3 播放友好性需求..................................................................... - 7 -2.1.4 播放器扩展卡需求................................................................. - 8 -2.1.5 功能需求(时序图)分析.......................................................... - 9 -2.2 系统结构图和流程图...................................................................... - 10 -2.3 系统界面需求.................................................................................. - 11 -2.4 系统性能需求.................................................................................. - 12 -2.5 运行环境需求.................................................................................. - 12 - 第三章Android数据库设计 ........................................................................ - 13 -3.1 数据库及字段属性设计.................................................................. - 13 -3.1.1 字段设计（表、图）........................................................... - 13 -3.1.2 音乐播放器E-R图 .............................................................. - 15 -3.2 数据库连接...................................................................................... - 15 -3.2.1 创建数据库........................................................................... - 15 -3.2.2 操作数据库........................................................................... - 16 -3.2.3 数据显示............................................................................... - 17 - 第四章Android项目介绍 ............................................................................ - 18 -4.1 什么是Android？ ........................................................................... - 18 -4.1.1 Android简介 ......................................................................... - 18 -4.1.2 Android Features特性........................................................... - 18 -4.1.3 Android基本框架（Android Architecture） ....................... - 19 -4.2 搭建Android开发环境 .................................................................. - 23 -4.3 Android常用工具的使用 ................................................................ - 25 -4.3.1 命令行的使用....................................................................... - 25 -4.3.2 Dalvik Debug Monitor Service (DDMS)的使用................... - 26 -4.4 Android 音乐播放器的工程 ........................................................... - 26 -4.4.1 Android项目 ......................................................................... - 26 -4.4.2 Android工程程序结构 ......................................................... - 27 -4.4.3 AndroidManifest.xml文件.................................................... - 29 - 第五章播放器系统功能详细设计............................................................... - 31 -5.1音乐播放器主界面功能实现........................................................... - 31 -5.1.1 播放器主界面....................................................................... - 31 -5.1.2 播放界面音轨的实现........................................................... - 32 -5.1.3 播放器播放、暂停、停止等功能....................................... - 35 -5.2 播放列表功能.................................................................................. - 36 -5.3 菜单功能.......................................................................................... - 38 -5.3.1 菜单界面............................................................................... - 38 -5.3.2 菜单功能实现....................................................................... - 39 -5.4 播放设置界面.................................................................................. - 41 -5.4.1 界面实现............................................................................... - 41 -5.4.2 歌词显示实现....................................................................... - 42 -5.5 手机扩展卡的访问.......................................................................... - 44 -5.5.1 文件浏览器界面................................................................... - 45 -5.5.2 文件浏览器功能实现........................................................... - 46 -5.6 数据存储方式.................................................................................. - 47 -5.6.1 SharedPreferences .................................................................. - 47 -5.6.2 File存储方式 ........................................................................ - 48 -5.6.3 SQLiteDatabase数据库 ........................................................ - 48 - 第六章结论...................................................................... 错误！未定义书签。
