<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context="com.example.chenshuai.myapplication.ActivityMusic"android:orientation="vertical"><ProgressBarandroid:layout_width="match_parent"android:layout_height="wrap_content"style="@android:style/Widget.ProgressBar.Horizontal"android:id="@+id/pb"/><SeekBarandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/sbr" /><TextViewandroid:layout_width="match_parent"android:layout_height="40sp"android:text="播放状态"android:textSize="20sp"android:gravity="center_horizontal"android:id="@+id/tv_1"/><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"><Buttonandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:text="播放"android:onClick="play_onclick"/><Buttonandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:text="暂停"android:onClick="pause_onclick"/><Buttonandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:text="停止"android:onClick="stop_onclick"/><Buttonandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:text="退出"android:onClick="exit_onclick"/></LinearLayout></LinearLayout>

package com.example.chenshuai.myapplication;import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;public class MyServiceMusic extends Service {public MyServiceMusic() {}public class Mybind extends Binder{//获取歌曲长度public int getMusicDuration(){int rtn = 0;if (mediaPlayer != null){rtn = mediaPlayer.getDuration();}return rtn;}//获取当前播放进度public int getMusicCurrentPosition(){int rtn = 0;if (mediaPlayer != null){rtn = mediaPlayer.getCurrentPosition();}return rtn;}  public void seekTo(int position){if (mediaPlayer != null){mediaPlayer.seekTo(position);}}}@Overridepublic IBinder onBind(Intent intent) {// TODO: Return the communication channel to the service.//throw new UnsupportedOperationException("Not yet implemented");return  new Mybind();}private MediaPlayer mediaPlayer;@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {//获取意图传递的信息String action = intent.getStringExtra("action");switch (action){case "play":if (mediaPlayer == null){mediaPlayer = MediaPlayer.create(this,R.raw.onceagain);}mediaPlayer.start();break;case "stop":if (mediaPlayer !=null){mediaPlayer.stop();mediaPlayer.reset();mediaPlayer.release();mediaPlayer = null;}break;case "pause":if (mediaPlayer !=null && mediaPlayer.isPlaying()){mediaPlayer.pause();}break;}return super.onStartCommand(intent, flags, startId);}
}

package com.example.chenshuai.myapplication;import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.SeekBar;
import android.widget.TextView;public class ActivityMusicservice extends AppCompatActivity {TextView tv_1;ProgressBar pb;SeekBar sbr;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_activity_music);tv_1 = (TextView)findViewById(R.id.tv_1);tv_1.setText("播放状态11：停止播放。。。");pb = (ProgressBar)findViewById(R.id.pb);sbr = (SeekBar)findViewById(R.id.sbr);}ServiceConnection serviceConnection;MyServiceMusic.Mybind mybind;public void play_onclick(View view){Intent intent = new Intent(this,MyServiceMusic.class);intent.putExtra("action","play");startService(intent);tv_1.setText("播放状态11：正在播放。。。");if (serviceConnection == null) {serviceConnection = new ServiceConnection() {@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {mybind = (MyServiceMusic.Mybind) service;//设置进度条的最大长度int max = mybind.getMusicDuration();pb.setMax(max);sbr.setMax(max);sbr.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {mybind.seekTo(progress);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {}});//连接之后启动子线程设置当前进度new Thread(){public void run(){//改变当前进度条的值//设置当前进度while (true) {pb.setProgress(mybind.getMusicCurrentPosition());// sbr.setProgress(mybind.getMusicCurrentPosition());try {Thread.sleep(100);} catch (Exception e) {e.printStackTrace();}}}}.start();}@Overridepublic void onServiceDisconnected(ComponentName name) {}};//以绑定方式连接服务
            bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);}}public void stop_onclick(View view){Intent intent = new Intent(this,MyServiceMusic.class);intent.putExtra("action","stop");startService(intent);tv_1.setText("播放状态11：停止播放。。。");}public void pause_onclick(View view){Intent intent = new Intent(this, MyServiceMusic.class);intent.putExtra("action","pause");startService(intent);tv_1.setText("播放状态11：暂停播放。。。");}public void exit_onclick(View view){stop_onclick(view);finish();}
}

<serviceandroid:name=".MyServiceMusic"android:enabled="true"android:exported="true" />