这是一款Android 端的本地音乐播放器，界面风格有模仿网易云音乐、bilibili、酷安、酷狗等。整体设计遵循了 Material Design 设计风格，界面美观，轻便实用，目前实现了基本的播放控制功能，还有主题切换， 可以扫描本地所有音乐文件并按歌单分类播放，目前已经上架到酷安应用市场。
1.首先我们需要一个常驻在后台的播放服务，在播放服务中绑定一个播放广播，我们在打开播放器的时候就启动这个播放服务。
public class MusicPlayerService extends Service {
private static final String TAG = MusicPlayerService.class.getName();
public static final String PLAYER_MANAGER_ACTION = "com.lijunyan.blackmusic.service.MusicPlayerService.player.action";
private PlayerManagerReceiver mReceiver;
public MusicPlayerService() {
}
@Override
public IBinder onBind(Intent intent) {
throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public void onCreate() {
super.onCreate();
Log.e(TAG, "onCreate: ");
register();
}
@Override
public void onDestroy() {
super.onDestroy();
Log.e(TAG, "onDestroy: ");
unRegister();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.e(TAG, "onStartCommand: ");
return super.onStartCommand(intent, flags, startId);
}
private void register() {
mReceiver = new PlayerManagerReceiver(MusicPlayerService.this);
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(PLAYER_MANAGER_ACTION);
registerReceiver(mReceiver, intentFilter);
}
private void unRegister() {
if (mReceiver != null) {
unregisterReceiver(mReceiver);
}
}
}
2.播放服务中的广播可以接受各种音频控制操作，包括播放、暂停、切歌等。程序在响应用户的音频控制操作时向这个播放广播发送对应的播放、暂停、停止等指令。广播收到不同的指令做不同的功能实现。
public class PlayerManagerReceiver extends BroadcastReceiver {
private static final String TAG = PlayerManagerReceiver.class.getName();
public static final String ACTION_UPDATE_UI_ADAPTER = "com.lijunyan.blackmusic.receiver.PlayerManagerReceiver:action_update_ui_adapter_broad_cast";
private MediaPlayer mediaPlayer;
private DBManager dbManager;
public static int status = Constant.STATUS_STOP;
private int playMode;
private int threadNumber;
private Context context;
public PlayerManagerReceiver() {
}
public PlayerManagerReceiver(Context context) {
super();
this.context = context;
dbManager = DBManager.getInstance(context);
mediaPlayer = new MediaPlayer();
Log.d(TAG, "create");
initMediaPlayer();
}
@Override
public void onReceive(Context context, Intent intent) {
int cmd = intent.getIntExtra(Constant.COMMAND,Constant.COMMAND_INIT);
Log.d(TAG, "cmd = " + cmd);
switch (cmd) {
case Constant.COMMAND_INIT:
Log.d(TAG, "COMMAND_INIT");
break;
case Constant.COMMAND_PLAY:
Log.d(TAG, "COMMAND_PLAY");
status = Constant.STATUS_PLAY;
String musicPath = intent.getStringExtra(Constant.KEY_PATH);
if (musicPath!=null) {
playMusic(musicPath);
}else {
mediaPlayer.start();
}
break;
case Constant.COMMAND_PAUSE:
mediaPlayer.pause();
status = Constant.STATUS_PAUSE;
break;
case Constant.COMMAND_STOP:
NumberRandom();
status = Constant.STATUS_STOP;
if(mediaPlayer!=null) {
mediaPlayer.stop();
}
initStopOperate();
break;
case Constant.COMMAND_PROGRESS://拖动进度
int curProgress = intent.getIntExtra(Constant.KEY_CURRENT, 0);
//异步的，可以设置完成监听来获取真正定位完成的时候
mediaPlayer.seekTo(curProgress);
break;
case Constant.COMMAND_RELEASE:
NumberRandom();
status = Constant.STATUS_STOP;
if(mediaPlayer!=null) {
mediaPlayer.stop();
mediaPlayer.release();
}
break;
}
UpdateUI();
}
private void initStopOperate(){
MyMusicUtil.setShared(Constant.KEY_ID,dbManager.getFirstId(Constant.LIST_ALLMUSIC));
}
private void playMusic(String musicPath) {
NumberRandom();
if (mediaPlayer!=null) {
mediaPlayer.release();
}
mediaPlayer = new MediaPlayer();
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
Log.d(TAG, "playMusic onCompletion: ");
NumberRandom(); //切换线程
onComplete(); //调用音乐切换模块，进行相应操作
UpdateUI(); //更新界面
}
});
try {
File file = new File(musicPath);
if(!file.exists()){
Toast.makeText(context,"歌曲文件不存在，请重新扫描",Toast.LENGTH_SHORT).show();
MyMusicUtil.playNextMusic(context);
return;
}
mediaPlayer.setDataSource(musicPath); //设置MediaPlayer数据源
mediaPlayer.prepare();
mediaPlayer.start();
new UpdateUIThread(this, context, threadNumber).start();
} catch (Exception e) {
e.printStackTrace();
}
}
//取一个（0，100）之间的不一样的随机数
private void NumberRandom() {
int count;
do {
count =(int)(Math.random()*100);
} while (count == threadNumber);
threadNumber = count;
}
private void onComplete() {
MyMusicUtil.playNextMusic(context);
}
private void UpdateUI() {
Intent playBarintent = new Intent(PlayBarFragment.ACTION_UPDATE_UI_PlayBar); //接收广播为MusicUpdateMain
playBarintent.putExtra(Constant.STATUS, status);
context.sendBroadcast(playBarintent);
Intent intent = new Intent(ACTION_UPDATE_UI_ADAPTER); //接收广播为所有歌曲列表的adapter
context.sendBroadcast(intent);
}
private void initMediaPlayer() {
NumberRandom(); // 改变线程号,使旧的播放线程停止
int musicId = MyMusicUtil.getIntShared(Constant.KEY_ID);
int current = MyMusicUtil.getIntShared(Constant.KEY_CURRENT);
Log.d(TAG, "initMediaPlayer musicId = " + musicId);
// 如果是没取到当前正在播放的音乐ID，则从数据库中获取第一首音乐的播放信息初始化
if (musicId == -1) {
return;
}
String path = dbManager.getMusicPath(musicId);
if (path == null) {
Log.e(TAG, "initMediaPlayer: path == null");
return;
}
if (current == 0) {
status = Constant.STATUS_STOP; // 设置播放状态为停止
}else {
status = Constant.STATUS_PAUSE; // 设置播放状态为暂停
}
Log.d(TAG, "initMediaPlayer status = " + status);
MyMusicUtil.setShared(Constant.KEY_ID,musicId);
MyMusicUtil.setShared(Constant.KEY_PATH,path);
UpdateUI();
}
public MediaPlayer getMediaPlayer() {
return mediaPlayer;
}
public int getThreadNumber() {
return threadNumber;
}
}
3.项目在播放一个音频的同时维护了一个线程实时去通知界面刷新，该线程从MediaPlayer中获取当前的播放进度、总时间等信息发送给播放界面，播放界面拿到数据就可以刷新播放显示信息了。
public class UpdateUIThread extends Thread {
private static final String TAG = UpdateUIThread.class.getName();
private int threadNumber;
private Context context;
private PlayerManagerReceiver playerManagerReceiver;
private int duration;
private int curPosition;
public UpdateUIThread(PlayerManagerReceiver playerManagerReceiver, Context context, int threadNumber) {
Log.i(TAG, "UpdateUIThread: " );
this.playerManagerReceiver = playerManagerReceiver;
this.context = context;
this.threadNumber = threadNumber;
}
@Override
public void run() {
try {
while (playerManagerReceiver.getThreadNumber() == this.threadNumber) {
if (playerManagerReceiver.status == Constant.STATUS_STOP) {
Log.e(TAG, "run: Constant.STATUS_STOP");
break;
}
if (playerManagerReceiver.status == Constant.STATUS_PLAY ||
playerManagerReceiver.status == Constant.STATUS_PAUSE) {
if (!playerManagerReceiver.getMediaPlayer().isPlaying()) {
Log.i(TAG, "run: getMediaPlayer().isPlaying() = " + playerManagerReceiver.getMediaPlayer().isPlaying());
break;
}
duration = playerManagerReceiver.getMediaPlayer().getDuration();
curPosition = playerManagerReceiver.getMediaPlayer().getCurrentPosition();
Intent intent = new Intent(PlayBarFragment.ACTION_UPDATE_UI_PlayBar);
intent.putExtra(Constant.STATUS, Constant.STATUS_RUN);
intent.putExtra(Constant.KEY_DURATION, duration);
intent.putExtra(Constant.KEY_CURRENT, curPosition);
context.sendBroadcast(intent);
}
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}catch (Exception e){
e.printStackTrace();
}
}
}
Download 本项目目前已上架到酷安应用市场，可到酷安应用市场搜索“听听音乐”下载
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