Android应用开发--MP3音乐播放器Service实现，kotlin开发微信小程序
作者：互联网
*/
@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
《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》
浏览器打开：qq.cn.hn/FTe 开源分享
();
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;
}
}
/**
标签：Service,--,kotlin,private,current,mediaPlayer,Intent,new,sendIntent 来源： https://blog.csdn.net/m0_64319112/article/details/121438169