一.布局

• main.xml：主布局背景  

<TabHost xmlns:android="http://schemas.android.com/apk/res/android"android:id="@android:id/tabhost"<LinearLayout<TabWidgetandroid:id="@android:id/tabs"<FrameLayoutandroid:id="@android:id/tabcontent"</LinearLayout>
</TabHost>

• music_item.xml：单个音乐条   

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"<ImageView  android:id="@+id/music_item_image"      // 音乐小图标android:background="@drawable/item"<LinearLayout<TextViewandroid:id="@+id/music_item_name"   // 音乐名android:text="依然爱你"<TextViewandroid:id="@+id/music_item_singer" // 歌手名android:text="王力宏"</LinearLayout><TextViewandroid:id="@+id/music_item_time"       // 音乐时长android:text="03:42" 
</LinearLayout>

• listmusic.xml：音乐列表  

<LinearLayout android:background="@drawable/listbg"<ListViewandroid:id="@+id/listAllMusic"</ListView>
</LinearLayout>

• artist.xml：艺术家列表  

<LinearLayout android:background="@drawable/listbg1"<ListViewandroid:id="@+id/artistListView"</ListView>
</LinearLayout>

• albums.xml：专辑列表  

<LinearLayout android:background="@drawable/listbg"<ListViewandroid:id="@+id/albumListView"</ListView>
</LinearLayout>

• songs.xml：最近播放列表  

<LinearLayout android:background="@drawable/listbg1"<ListViewandroid:id="@+id/listView1"</ListView>
</LinearLayout>

• music.xml：单首音乐播放界面布局  
• 模块一：歌曲名+歌手+单曲+音量调节+随机
• 模块二：自定义视图，展示歌词，java代码动态添加
• 模块三：音乐时长+音乐进度+各种播放按钮

<LinearLayout android:background="@drawable/bg"<RelativeLayout<cn.com.karl.util.LrcView                 // 引用自定义视图 实现歌词显示android:id="@+id/LyricShow"android:layout_below="@+id/linearLayout1"android:text="显示歌词"<LinearLayoutandroid:id="@+id/linearLayout1"       // 音乐标题、歌手、音量调节组合android:background="@drawable/appbackground"<TextViewandroid:id="@+id/music_name"      // 音乐名字android:text="依然爱你"<TextViewandroid:id="@+id/music_singer"    // 歌手android:text="王力宏" /><LinearLayout<ImageButtonandroid:id="@+id/music_loop"  // 单曲循环标志<SeekBarandroid:id="@+id/music_volume"// 音量调节进度条android:max="100"             // 最大值android:progress="50"         // 当前值android:progressDrawable="@drawable/seekbar_img" // 进度条背景android:thumb="@drawable/media_player_progress_button" /> // 进度条按钮<ImageButtonandroid:id="@+id/music_random"// 随机播放android:background="@drawable/play_random_sel" /></LinearLayout></LinearLayout><LinearLayoutandroid:background="@drawable/button"<LinearLayout<TextViewandroid:id="@+id/music_start_time" // 音乐开始时间android:text="00:00" /><SeekBarandroid:id="@+id/music_seekBar"    // 音乐进度条<TextViewandroid:id="@+id/music_end_time"   // 音乐结束时间android:text="03:20" /></LinearLayout><LinearLayout<ImageButtonandroid:id="@+id/music_lasted"     // 第一首音乐 android:src="@drawable/latest1" /><ImageButtonandroid:id="@+id/music_rewind"     // 前一首android:src="@drawable/rewind" /><ImageButtonandroid:id="@+id/music_play"       // 播放音乐android:src="@drawable/play1" /><ImageButtonandroid:id="@+id/music_foward"     // 下一首android:src="@drawable/foward" /><ImageButtonandroid:id="@+id/music_next"       // 最后一首音乐android:src="@drawable/next1" /></LinearLayout></LinearLayout></RelativeLayout>
</LinearLayout>

二.活动

• MainActivity.java：布局填充了app主界面，导航其他活动

public class MainActivity extends TabActivity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE); // 去掉标题栏（APP名字）this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); // 应用全屏显示setContentView(R.layout.main);Resources res = getResources(); // 读取静态资源文件TabHost tabHost = getTabHost(); // 声明选项卡TabHost.TabSpec spec; 			// 声明选项卡内容Intent intent;  intent = new Intent().setClass(this, ListActivity.class);spec = tabHost.newTabSpec("音乐").setIndicator("音乐",res.getDrawable(R.drawable.item)).setContent(intent);tabHost.addTab(spec);			// 将内容添加到选项卡中//....tabHost.setCurrentTab(0); // 会自动加载第一个选项卡，为了避免此现象而设置的代码}}

• ListActivity.java：实现音乐列表填充、跳转到音乐播放界面的功能

public class ListActivity extends Activity {private ListView listView; // 声明音乐列表@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);setContentView(R.layout.listmusic);listView= (ListView) this.findViewById(R.id.listAllMusic); // 获取音乐列表组件List<Music> listMusic=MusicList.getMusicData(getApplicationContext()); // 从本机上下文获取音乐资源MusicAdapter adapter=new MusicAdapter(this, listMusic); // 实例化音乐列表适配器 listView.setAdapter(adapter); // 填充音乐列表listView.setOnItemClickListener(new OnItemClickListener() { // 为音乐列表选项点击事件添加侦听@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {// 创建Intent对象，参数分别为上下文，要跳转的 Activity类Intent intent = new Intent(ListActivity.this,MusicActivity.class);intent.putExtra("id", arg2); // 将要传递的值附加到Intent对象startActivity(intent); // 启动该Intent对象，实现跳转}});}}

• ArtistsActivity.java：实现艺术家列表填充、跳转到音乐播放界面的功能

public class ArtistsActivity extends Activity {// ... // 实例化艺术家列表适配器 ArtistsAdapter adapter=new ArtistsAdapter(this, MusicList.getMusicData(this)); artistListView.setAdapter(adapter); // 填充音艺术家列表artistListView.setOnItemClickListener(new OnItemClickListener() { @Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {Intent intent = new Intent(ArtistsActivity.this,MusicActivity.class); // 上下文，要跳转的 Activity类intent.putExtra("id", arg2); // 将要传递的值附加到Intent对象startActivity(intent); // 实现跳转}});}}

• AlbumsActivity.java：实现专辑列表填充、跳转到音乐播放界面的功能

public class AlbumsActivity extends Activity {// ...实例化专辑列表适配器AlbumsAdapter adapter=new AlbumsAdapter(this, MusicList.getMusicData(this));  albumListView.setAdapter(adapter);albumListView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {// 实现专辑列表页面跳转到音乐播放界面Intent intent = new Intent(AlbumsActivity.this,MusicActivity.class);intent.putExtra("id", arg2);startActivity(intent); }});}}

• SongsActivity.java：实现最近播放列表填充、跳转到音乐播放界面的功能
• MusicList.java：遍历本地数据库，获取.mp3音乐列表
• 查询 SD卡上的音乐文件信息：
• ContentResolver的查询接口：
  Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)；

1. Uri：指明要查询的数据库名称加上表的名称，从MediaStore中我们可以找到相应信息的参数
2. Projection: 指定查询数据库表中的哪几列，返回的游标中将包括相应的信息。Null则返回所有信息
3. selection: 指定查询条件
4. selectionArgs：参数selection里有 ？这个符号是，这里可以以实际值代替这个问号。如果selection这个没有？的话，那么这个String数组可以为null
5. SortOrder：指定查询结果的排列顺序

• 返回所有在外部存储卡上的音乐文件的信息：
• Cursor cursor = query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
• 得到cursor后，调用 Cursor的相关方法具体的音乐信息，见下实例：

public class MusicList {public static List<Music> getMusicData(Context context) {List<Music> musicList = new ArrayList<Music>();ContentResolver cr = context.getContentResolver();if (cr != null) {Cursor cursor = cr.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null,null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);if (null == cursor) { return null;}if (cursor.moveToFirst()) { // 如果有歌曲就开始遍历歌曲对象do {Music m = new Music(); // 实例化歌曲对象 String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE)); //获取标题String singer = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST)); // 获取作者if ("<unknown>".equals(singer)) {singer = "未知艺术家";}String album = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM)); // 获取专辑名long size = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE)); //获取歌曲大小long time = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION)); // 获取歌曲时长String url = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));	// 获取歌曲文件路径String name = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME)); // 获取歌曲文件的全名称String sbr = name.substring(name.length() - 3,if (sbr.equals("mp3")) { m.setTitle(title);// ...m.setName(name);musicList.add(m); // 将符合要求的音乐对象添加到音乐列表}} while (cursor.moveToNext());}}return musicList; // 返回音乐列表}}

三.适配器

• AlbumsAdapter.java，用于填充内容，其他同理

public class AlbumsAdapter extends BaseAdapter { // 专辑列表适配器private List<Music> listMusic;private Context context;public AlbumsAdapter(Context context,List<Music> listMusic){this.context=context;this.listMusic=listMusic;}public void setListItem(List<Music> listMusic){ this.listMusic=listMusic;}@Overridepublic int getCount() {return listMusic.size();}@Overridepublic Object getItem(int arg0) {return listMusic.get(arg0);}@Overridepublic long getItemId(int position) {return position;}@Override // 获得指定位置要显示的View，convertView：列表视图public View getView(int position, View convertView, ViewGroup parent) {if(convertView==null){convertView=LayoutInflater.from(context).inflate(R.layout.music_item, null);}Music m=listMusic.get(position);// 音乐名TextView textMusicName=(TextView) convertView.findViewById(R.id.music_item_name);textMusicName.setText(m.getSinger());// 歌手TextView textMusicSinger=(TextView) convertView.findViewById(R.id.music_item_singer);textMusicSinger.setText(m.getName());/*   // 持续时间TextView textMusicTime=(TextView) convertView.findViewById(R.id.music_item_time);textMusicTime.setText(toTime((int)m.getTime()));*/return convertView;}// 音乐时长格式化public String toTime(int time) {time /= 1000;int minute = time / 60;int hour = minute / 60;int second = time % 60;minute %= 60;return String.format("%02d:%02d", minute, second); // 将分、秒至少格式化为两位十进制数}
}

• MusicService.java

public class MusicService extends Service implements Runnable {//...@Overridepublic IBinder onBind(Intent arg0) {return null;}@Overridepublic void onCreate() {lists = MusicList.getMusicData(getApplicationContext()); // 从本机获取音乐列表SeekBarBroadcastReceiver receiver = new SeekBarBroadcastReceiver(); IntentFilter filter = new IntentFilter("cn.com.karl.seekBar");this.registerReceiver(receiver, filter);new Thread(this).start();super.onCreate();}@Overridepublic void onStart(Intent intent, int startId) {String play = intent.getStringExtra("play");_id = intent.getIntExtra("id", 1);if (play.equals("play")) { // 暂停播放if (null != player) {player.release(); // 释放媒体资源player = null;}playMusic(_id);} else if (play.equals("pause")) { // 暂停if (null != player) {player.pause();}} else if (play.equals("playing")) { // 开始播放if (player != null) {player.start();} else {playMusic(_id);}} else if (play.equals("replaying")) { // 重新播放} else if (play.equals("first")) { // 播放第一首int id = intent.getIntExtra("id", 0);playMusic(id);} else if (play.equals("rewind")) { // 播放前一首int id = intent.getIntExtra("id", 0);playMusic(id);} else if (play.equals("forward")) { // 播放下一首int id = intent.getIntExtra("id", 0);playMusic(id);} else if (play.equals("last")) { // 播放最后一首int id = intent.getIntExtra("id", 0);playMusic(id);}}private void playMusic(int id) {mLrcProcess = new LrcProcess(); // 初始化歌词mLrcProcess.readLRC(lists.get(_id).getUrl()); // 读取歌词文件lrcList = mLrcProcess.getLrcContent(); // 传回处理后的歌词文件MusicActivity.lrc_view.setSentenceEntities(lrcList);MusicActivity.lrc_view.setAnimation(AnimationUtils.loadAnimation(MusicService.this, R.anim.alpha_z)); // 切换带动画显示歌词mHandler.post(mRunnable); // 启动线程if (null != player) { // 如果存在媒体资源管理者player.release(); // 释放资源player = null;}if (id >= lists.size() - 1) { //计算正在播放的音乐位置_id = lists.size() - 1;} else if (id <= 0) {_id = 0;}Music m = lists.get(_id);String url = m.getUrl();Uri myUri = Uri.parse(url);player = new MediaPlayer(); // 重新实例化媒体管理者player.reset(); // 重置音乐管理者player.setAudioStreamType(AudioManager.STREAM_MUSIC);try {player.setDataSource(getApplicationContext(), myUri);player.prepare();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (SecurityException e) {}player.start(); // 开始播放}private class SeekBarBroadcastReceiver extends BroadcastReceiver { // 设置进度条广播接收器@Overridepublic void onReceive(Context context, Intent intent) {int seekBarPosition = intent.getIntExtra("seekBarPosition", 0);player.seekTo(seekBarPosition * player.getDuration() / 100);player.start();}}@Overridepublic void run() {while (isRun) {try {Thread.sleep(200);} catch (InterruptedException e) {e.printStackTrace();}if (null != player) {int position = player.getCurrentPosition();int total = player.getDuration();Intent intent = new Intent("cn.com.karl.progress");intent.putExtra("position", position);intent.putExtra("total", total);sendBroadcast(intent);}if (null != player) {if (player.isPlaying()) {playing = true;} else {playing = false;}}}}Handler mHandler = new Handler();Runnable mRunnable = new Runnable() { 	// 歌词滚动线程@Overridepublic void run() {MusicActivity.lrc_view.SetIndex(LrcIndex());MusicActivity.lrc_view.invalidate();mHandler.postDelayed(mRunnable, 100);}};private List<LrcContent> lrcList = new ArrayList<LrcContent>(); // 创建歌词对象private int index = 0; // 初始化歌词检索值private int CurrentTime = 0; // 初始化歌曲播放时间的变量private int CountTime = 0; // 初始化歌曲总时间的变量// 同步歌词处理类public int LrcIndex() {if (player.isPlaying()) {CurrentTime = player.getCurrentPosition(); // 获得歌曲播放在哪的时间CountTime = player.getDuration(); // 获得歌曲总时间长度}if (CurrentTime < CountTime) {for (int i = 0; i < lrcList.size(); i++) {if (i < lrcList.size() - 1) {if (CurrentTime < lrcList.get(i).getLrc_time() && i == 0) {index = i;}if (CurrentTime > lrcList.get(i).getLrc_time()&& CurrentTime < lrcList.get(i + 1).getLrc_time()) {index = i;}}if (i == lrcList.size() - 1&& CurrentTime > lrcList.get(i).getLrc_time()) {index = i;}}}return index;}}

• MusicActivity.java：

public class MusicActivity extends Activity implements SensorEventListener{// 声明组件private TextView textName;					// 歌名private TextView textSinger;				// 作者private SeekBar seekBarVolume;				// 音量进度条private ImageButton imageBtnLoop;			// 单曲循环按钮private ImageButton imageBtnRandom;			// 随机播放按钮public static LrcView lrc_view;				// 歌词视图private SeekBar seekBar1;					// 音乐进度条private List<Music> lists;					// 音乐列表private Boolean isPlaying = false;			// 现在播放状态public static Boolean isLoop=true;				// 是否循环播放@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);  // 取消标题栏this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.music);textName = (TextView) this.findViewById(R.id.music_name);seekBar1 = (SeekBar) this.findViewById(R.id.music_seekBar);textEndTime = (TextView) this.findViewById(R.id.music_end_time);imageBtnRewind = (ImageButton) this.findViewById(R.id.music_rewind);@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,progress, AudioManager.FLAG_ALLOW_RINGER_MODES);}});seekBar1.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { // 设置音乐进度条改变监听器@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {seekBar1.setProgress(seekBar.getProgress()); Intent intent=new Intent("cn.com.karl.seekBar");intent.putExtra("seekBarPosition", seekBar.getProgress());sendBroadcast(intent);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}Music m = lists.get(id);textName.setText(m.getTitle());textSinger.setText(m.getSinger());textEndTime.setText(toTime((int) m.getTime()));imageBtnPlay.setImageResource(R.drawable.pause1);Intent intent = new Intent(MusicActivity.this, MusicService.class);intent.putExtra("play", "play");seekBar1.invalidate();}}private class MyListener implements OnClickListener { // 按钮点击事件监听@Overridepublic void onClick(View v) {if (v == imageBtnLast) { // 第一首按钮id = 0;Music m = lists.get(0);textName.setText(m.getTitle());textSinger.setText(m.getSinger());textEndTime.setText(toTime((int) m.getTime()));imageBtnPlay.setImageResource(R.drawable.pause1);Intent intent = new Intent(MusicActivity.this,MusicService.class);intent.putExtra("play", "first");intent.putExtra("id", id);ce(R.drawable.play1);replaying=false;} else { // 如果没有播放Intent intent = new Intent(MusicActivity.this,MusicService.class);intent.putExtra("play", "playing");intent.putExtra("id", id);startService(intent);isPlaying = true;imageBtnPlay.setImageResource(R.drawable.pause1);replaying=true;}} else if (v == imageBtnForward) { // 下一首按钮int id=MusicService._id+1;if(id>=lists.size()-1){ // 判断是否是列表的最后一首歌曲id=lists.size()-1;}else if(id<=0){id=0;}Music m = lists.get(id);textName.setText(m.getTitle());textSinger.setText(m.getSinger());textEndTime.setText(toTime((int) m.getTime()));imageBtnPlay.setImageResource(R.drawable.pause1);Intent intent = new Intent(MusicActivity.this,MusicService.class);} else if (v == imageBtnLoop) { // 如果点击了是否单曲循环那个按钮if (isLoop == true) { // 顺序播放 imageBtnLoop.setBackgroundResource(R.drawable.play_loop_spec);isLoop = false;} else { // 单曲循环imageBtnLoop.setBackgroundResource(R.drawable.play_loop_sel);isLoop = true;}}
}