package com.itheima.musicplayer;
package com.itheima.musicplayer; public interface MusicInterface { void play(); void pause(); void continuePlay(); void seekTo(int progress); }
package com.itheima.musicplayer; import java.io.IOException; import java.util.Timer; import java.util.TimerTask; import android.app.Service; import android.content.Intent; import android.media.MediaPlayer; import android.media.MediaPlayer.OnPreparedListener; import android.os.Binder; import android.os.Bundle; import android.os.IBinder; import android.os.Message; public class MusicService extends Service { MediaPlayer player;//播放音乐API private Timer timer; @Override public IBinder onBind(Intent intent) { return new MusicController(); } class MusicController extends Binder implements MusicInterface{ @Override public void play() { MusicService.this.play(); } @Override public void pause() { MusicService.this.pause(); } @Override public void continuePlay() { MusicService.this.continuePlay(); } @Override public void seekTo(int progress) { MusicService.this.seekTo(progress); } } @Override public void onCreate() { super.onCreate(); player = new MediaPlayer(); } @Override public void onDestroy() { super.onDestroy(); //停止播放 player.stop(); //释放占用的资源,此时player对象已经废掉了,但是player对象还在。 player.release(); player = null; if(timer != null){ timer.cancel(); timer = null; } } //播放音乐 public void play(){ //重置 player.reset(); try { //加载多媒体文件 player.setDataSource("sdcard/zxmzf.mp3");//播放本地音频可以同步准备,调用主线程的player.prepare()方法和start()方法,因为主线程知道prepare()好了之后再start() // player.setDataSource("http://192.168.13.119:8080/bzj.mp3"); //播放网络音频是一个耗时操作必须要开启子线城异步准备调用player.prepareAsync()方法,这个方法默认就是开启子线城,不能直接调用主线程的start()方法因为主线程不知道子线城什么时候准备完毕,因此要在主线程做监听setOnPreparedListener(),当子线城准备完了之后主线程监听到了之后主线程才能start() // player.prepare(); 因为调用了硬件所以要做准备 player.prepareAsync(); //异步准备,开启子线程加载资源 // player.start(); player.setOnPreparedListener(new OnPreparedListener() {//准备监听 //prepare()方法准备完毕时,此方法调用 @Override public void onPrepared(MediaPlayer mp) { player.start(); addTimer(); } }); } catch (Exception e) { e.printStackTrace(); } } //继续播放 public void continuePlay(){ player.start(); } //暂停播放 public void pause(){ player.pause(); } public void seekTo(int progress){ player.seekTo(progress); } public void addTimer(){ if(timer == null){ timer = new Timer();//timer就是开启子线程执行任务,与纯粹的子线城不同的是可以控制子线城执行的时间, timer.schedule(new TimerTask() { @Override public void run() { //获取歌曲总时长 int duration = player.getDuration(); //获取歌曲当前播放进度 int currentPosition= player.getCurrentPosition(); Message msg = MainActivity.handler.obtainMessage(); //把进度封装至消息对象中 Bundle bundle = new Bundle(); bundle.putInt("duration", duration); bundle.putInt("currentPosition", currentPosition); msg.setData(bundle); MainActivity.handler.sendMessage(msg); } //开始计时任务后的5毫秒后第一次执行run方法,以后每500毫秒执行一次 }, 5, 500); } } }
本文转自农夫山泉别墅博客园博客,原文链接:http://www.cnblogs.com/yaowen/p/4966598.html,如需转载请自行联系原作者