Android简易音乐播放器移动开发渝晟的博客-

效果图：

功能：播放，暂停，上一首，下一首

部分demo：
MainActivity：

public class MainActivity extends Activity implements OnClickListener { // 获取界面中显示歌曲标题、作者文本框     TextView title, author; // 播放/暂停、停止按钮     ImageButton play, stop; //上一首，下一首     ImageButton pre, next;     ImageView cover;      ActivityReceiver activityReceiver; public static final String CTL_ACTION = "org.crazyit.action.CTL_ACTION"; public static final String UPDATE_ACTION = "org.crazyit.action.UPDATE_ACTION"; // 定义音乐的播放状态，1代表没有播放；2代表正在播放；3代表暂停 int status = 1;     String[] titleStrs = new String[] { "无羁", "莲花坞", "荒城渡" };     String[] authorStrs = new String[] { "王一博", "林海", "周深" };     Integer[] covers = new Integer[] { R.drawable.unrestrained, R.drawable.lotus,             R.drawable.barrencity}; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 获取程序界面界面中的两个按钮         play = (ImageButton) this.findViewById(R.id.play);         stop = (ImageButton) this.findViewById(R.id.stop);         title = (TextView) findViewById(R.id.title);         author = (TextView) findViewById(R.id.author);         cover = findViewById(R.id.cover);         pre = this.findViewById(R.id.pre);         next = this.findViewById(R.id.next); // 为两个按钮的单击事件添加监听器         play.setOnClickListener(this);         stop.setOnClickListener(this); // 为上一首、下一首的单击事件添加监听器         pre.setOnClickListener(this);         next.setOnClickListener(this);          activityReceiver = new ActivityReceiver(); // 创建IntentFilter         IntentFilter filter = new IntentFilter(); // 指定BroadcastReceiver监听的Action         filter.addAction(UPDATE_ACTION); // 注册BroadcastReceiver registerReceiver(activityReceiver, filter);          Intent intent = new Intent(this, MusicService.class); // 启动后台Service startService(intent); } // 自定义的BroadcastReceiver，负责监听从Service传回来的广播 public class ActivityReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { // 获取Intent中的update消息，update代表播放状态 int update = intent.getIntExtra("update", -1); // 获取Intent中的current消息，current代表当前正在播放的歌曲 int current = intent.getIntExtra("current", -1); if (current >= 0) {                 title.setText(titleStrs[current]);                 author.setText(authorStrs[current]);                 cover.setImageResource(covers[current]); } switch (update) { case 1:                     play.setImageResource(R.drawable.play);                     status = 1; break; // 控制系统进入播放状态 case 2: // 播放状态下设置使用暂停图标                     play.setImageResource(R.drawable.pause); // 设置当前状态                     status = 2; break; // 控制系统进入暂停状态 case 3: // 暂停状态下设置使用播放图标                     play.setImageResource(R.drawable.play); // 设置当前状态                     status = 3; break; } } } @Override public void onClick(View source) { // 创建Intent         Intent intent = new Intent("org.crazyit.action.CTL_ACTION"); switch (source.getId()) { // 按下播放/暂停按钮 case R.id.play:                 intent.putExtra("control", 1); break; // 按下停止按钮 case R.id.stop:                 intent.putExtra("control", 2); break; case R.id.pre:                 intent.putExtra("control",3); case R.id.next:                 intent.putExtra("control",4); } // 发送广播，将被Service组件中的BroadcastReceiver接收到 sendBroadcast(intent); } } 

MusicService：

public class MusicService extends Service {     MyReceiver serviceReceiver;     AssetManager am;     String[] musics = new String[] { "unrestrained.mp3" + "", "lotus.mp3", "barrencity.mp3"};     MediaPlayer mPlayer; // 当前的状态，1代表没有播放；2代表正在播放；3代表暂停 int status = 1; // 记录当前正在播放的音乐 int current = 0; @Override public IBinder onBind(Intent intent) { return null; } @Override public void onCreate() { super.onCreate();         am = getAssets(); // 创建BroadcastReceiver         serviceReceiver = new MyReceiver(); // 创建IntentFilter         IntentFilter filter = new IntentFilter();         filter.addAction(MainActivity.CTL_ACTION); registerReceiver(serviceReceiver, filter); // 创建MediaPlayer         mPlayer = new MediaPlayer(); // 为MediaPlayer播放完成事件绑定监听器         mPlayer.setOnCompletionListener(new OnCompletionListener() // ① { @Override public void onCompletion(MediaPlayer mp) {                 current++; if (current >= 3) {                     current = 0; } //发送广播通知Activity更改文本框                 Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION);                 sendIntent.putExtra("current", current); // 发送广播，将被Activity组件中的BroadcastReceiver接收到 sendBroadcast(sendIntent); // 准备并播放音乐 prepareAndPlay(musics[current]); } }); } public class MyReceiver extends BroadcastReceiver { @Override public void onReceive(final Context context, Intent intent) { int control = intent.getIntExtra("control", -1); switch (control) { // 播放或暂停 case 1: // 原来处于没有播放状态 if (status == 1) { // 准备并播放音乐 prepareAndPlay(musics[current]);                         status = 2; } // 原来处于播放状态 else if (status == 2) { // 暂停                         mPlayer.pause(); // 改变为暂停状态                         status = 3; } // 原来处于暂停状态 else if (status == 3) { // 播放                         mPlayer.start(); // 改变状态                         status = 2; } break; // 停止声音 case 2: // 如果原来正在播放或暂停 if (status == 2 || status == 3) { // 停止播放                         mPlayer.stop();                         status = 1; } case 3:                     current--; if(current < 0)                         current = 0; prepareAndPlay(musics[current]); case 4:                     current++; if(current > musics.length-1)                         current = 0; prepareAndPlay(musics[current]); } // 广播通知Activity更改图标、文本框             Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION);             sendIntent.putExtra("update", status);             sendIntent.putExtra("current", current); // 发送广播，将被Activity组件中的BroadcastReceiver接收到 sendBroadcast(sendIntent); } } private void prepareAndPlay(String music) { try { // 打开指定音乐文件             AssetFileDescriptor afd = am.openFd(music);             mPlayer.reset(); // 使用MediaPlayer加载指定的声音文件。             mPlayer.setDataSource(afd.getFileDescriptor(),                     afd.getStartOffset(), afd.getLength()); // 准备声音             mPlayer.prepare(); // 播放             mPlayer.start(); } catch (IOException e) {             e.printStackTrace(); } } } 

项目代码：https://github.com/flyCode-Lucky/AndroidStudyProject