Android应用开发--MP3音乐播放器Service实现，kotlin开发微信小程序

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*/

@SuppressLint(“NewApi”)

public class PlayerService extends Service {

private MediaPlayer mediaPlayer; // 媒体播放器对象

private String path; // 音乐文件路径

private int msg;

private boolean isPause; // 暂停状态

private int current = 0; // 记录当前正在播放的音乐

private List mp3Infos; //存放Mp3Info对象的集合

private int status = 3; //播放状态，默认为顺序播放

private MyReceiver myReceiver; //自定义广播接收器

private int currentTime; //当前播放进度

private int duration; //播放长度

//服务要发送的一些Action

public static final String UPDATE_ACTION = “com.wwj.action.UPDATE_ACTION”; //更新动作

public static final String CTL_ACTION = “com.wwj.action.CTL_ACTION”; //控制动作

public static final String MUSIC_CURRENT = “com.wwj.action.MUSIC_CURRENT”; //当前音乐播放时间更新动作

public static final String MUSIC_DURATION = “com.wwj.action.MUSIC_DURATION”;//新音乐长度更新动作

/**

• handler用来接收消息，来发送广播更新播放时间

*/

private Handler handler = new Handler() {

public void handleMessage(android.os.Message msg) {

if (msg.what == 1) {

if(mediaPlayer != null) {

currentTime = mediaPlayer.getCurrentPosition(); // 获取当前音乐播放的位置

Intent intent = new Intent();

intent.setAction(MUSIC_CURRENT);

intent.putExtra(“currentTime”, currentTime);

sendBroadcast(intent); // 给PlayerActivity发送广播

handler.sendEmptyMessageDelayed(1, 1000);

}

}

};

};

@Override

public void onCreate() {

super.onCreate();

Log.d(“service”, “service created”);

mediaPlayer = new MediaPlayer();

mp3Infos = MediaUtil.getMp3Infos(PlayerService.this);

/**

• 设置音乐播放完成时的监听器

*/

mediaPlayer.setOnCompletionListener(new OnCompletionListener() {

@Override

public void onCompletion(MediaPlayer mp) {

if (status == 1) { // 单曲循环

mediaPlayer.start();

} else if (status == 2) { // 全部循环

current++;

if(current > mp3Infos.size() - 1) { //变为第一首的位置继续播放

current = 0;

}

Intent sendIntent = new Intent(UPDATE_ACTION);

sendIntent.putExtra(“current”, current);

// 发送广播，将被Activity组件中的BroadcastReceiver接收到

sendBroadcast(sendIntent);

path = mp3Infos.get(current).getUrl();

play(0);

} else if (status == 3) { // 顺序播放

current++; //下一首位置

if (current <= mp3Infos.size() - 1) {

Intent sendIntent = new Intent(UPDATE_ACTION);

sendIntent.putExtra(“current”, current);

// 发送广播，将被Activity组件中的BroadcastReceiver接收到

sendBroadcast(sendIntent);

path = mp3Infos.get(current).getUrl();

play(0);

}else {

mediaPlayer.seekTo(0);

current = 0;

Intent sendIntent = new Intent(UPDATE_ACTION);

sendIntent.putExtra(“current”, current);

// 发送广播，将被Activity组件中的BroadcastReceiver接收到

sendBroadcast(sendIntent);

}

} else if(status == 4) { //随机播放

current = getRandomIndex(mp3Infos.size() - 1);

System.out.println(“currentIndex ->” + current);

Intent sendIntent = new Intent(UPDATE_ACTION);

sendIntent.putExtra(“current”, current);

// 发送广播，将被Activity组件中的BroadcastReceiver接收到

sendBroadcast(sendIntent);

path = mp3Infos.get(current).getUrl();

play(0);

}

}

});

myReceiver = new MyReceiver();

IntentFilter filter = new IntentFilter();

filter.addAction(PlayerActivity.CTL_ACTION);

registerReceiver(myReceiver, filter);

}

/**

• 获取随机位置

• @param end

• @return

*/

protected int getRandomIndex(int end) {

int index = (int) (Math.random() * end);

return index;

}

@Override

public IBinder onBind(Intent arg0) {

return null;

}

@Override

public void onStart(Intent intent, int startId) {

path = intent.getStringExtra(“url”); //歌曲路径

current = intent.getIntExtra(“listPosition”, -1); //当前播放歌曲的在mp3Infos的位置

msg = intent.getIntExtra(“MSG”, 0); //播放信息

if (msg == AppConstant.PlayerMsg.PLAY_MSG) { //直接播放音乐

play(0);

} else if (msg == AppConstant.PlayerMsg.PAUSE_MSG) { //暂停

pause();

} else if (msg == AppConstant.PlayerMsg.STOP_MSG) { //停止

stop();

} else if (msg == AppConstant.PlayerMsg.CONTINUE_MSG) { //继续播放

resume();

} else if (msg == AppConstant.PlayerMsg.PRIVIOUS_MSG) { //上一首

previous();

} else if (msg == AppConstant.PlayerMsg.NEXT_MSG) { //下一首

next();

} else if (msg == AppConstant.PlayerMsg.PROGRESS_CHANGE) { //进度更新

currentTime = intent.getIntExtra(“progress”, -1);

play(currentTime);

} else if (msg == AppConstant.PlayerMsg.PLAYING_MSG) {

handler.sendEmptyMessage(1);

}

super.onStart(intent, startId);

}

/**

• 播放音乐

• @param position

*/

private void play(int currentTime) {

try {

mediaPlayer.reset();// 把各项参数恢复到初始状态

mediaPlayer.setDataSource(path);

mediaPlayer.prepare(); // 进行缓冲

mediaPlayer.setOnPreparedListener(new PreparedListener(currentTime));// 注册一个监听器

handler.sendEmptyMessage(1);

} catch (Exception e) {

e.printStackTrace();

}

}

/**

• 暂停音乐

*/

private void pause() {

if (mediaPlayer != null && mediaPlayer.isPlaying()) {

mediaPlayer.pause();

isPause = true;

}

}

private void resume() {

if (isPause) {

mediaPlayer.start();

isPause = false;

}

}

/**

• 上一首

*/

private void previous() {

Intent sendIntent = new Intent(UPDATE_ACTION);

sendIntent.putExtra(“current”, current);

// 发送广播，将被Activity组件中的BroadcastReceiver接收到

sendBroadcast(sendIntent);

play(0);

}

/**

• 下一首

*/

private void next() {

Intent sendIntent = new Intent(UPDATE_ACTION);

sendIntent.putExtra(“current”, current);

// 发送广播，将被Activity组件中的BroadcastReceiver接收到

sendBroadcast(sendIntent);

play(0);

}

/**

• 停止音乐

*/

private void stop() {

if (mediaPlayer != null) {

mediaPlayer.stop

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();

try {

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

} catch (Exception e) {

e.printStackTrace();

}

}

}

@Override

public void onDestroy() {

if (mediaPlayer != null) {

mediaPlayer.stop();

mediaPlayer.release();

mediaPlayer = null;

}

}

/**

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