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<service android:name=".MyService" />

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activity_main

<?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:id="@+id/activity_main"
    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.bw.lenovo.slidingmenu_demo.MainActivity"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn1"
        android:onClick="onClick"
        android:text="¿ªÊ¼"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/btn2"
        android:onClick="onClick"
        android:text="ÔÝÍ£"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/btn3"
        android:onClick="onClick"
        android:text="Í£Ö¹"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

MyService

package com.bw.lenovo.slidingmenu_demo;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.support.annotation.Nullable;

/**
 * Created by lenovo on 2017/11/8.
 */

public class MyService extends Service {
    private MediaPlayer mPlayer;

    @Override
    public void onCreate() {
        super.onCreate();
        //Äõ½MediaPlayerµÄ¶ÔÏó
        mPlayer = MediaPlayer.create(this,R.raw.ybxy);
        //ÉèÖÃÊÇ·ñÑ­»·²¥·Å
        mPlayer.setLooping(true);
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        int key = intent.getIntExtra("key",-1);
        switch (key){
            case 1://¿ªÊ¼²¥·Å
                startMesuc();
                break;
            case 2://ÔÝÍ£²¥·Å
                paseMusic();
                break;
            case 3://Í£Ö¹²¥·Å
                stopMusic();
                break;
        }


        return START_REDELIVER_INTENT;
    }

    //Í£Ö¹²¥·Å
    private void stopMusic() {
        if(mPlayer!=null&&mPlayer.isPlaying()){
            mPlayer.stop();
            mPlayer.release();
            mPlayer = null;

        }

    }

    //ÔÝÍ£²¥·Å
    private void paseMusic() {
        if(mPlayer!=null&&mPlayer.isPlaying()){
            mPlayer.pause();
        }

    }

    //¿ªÊ¼²¥·Å
    private void startMesuc() {
        if (mPlayer==null){
            mPlayer = MediaPlayer.create(this,R.raw.ybxy);
        }
        if (mPlayer!=null&& !mPlayer.isPlaying()){
            mPlayer.start();
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }
}

MainActivity

package com.bw.lenovo.slidingmenu_demo;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {
    private Intent mIntent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mIntent = new Intent(this,MyService.class);
    }

    public void onClick(View view) {
        switch (view.getId()){
            case R.id.btn1:
                mIntent.putExtra("key",1);
                startService(mIntent);
                break;
            case R.id.btn2:
                mIntent.putExtra("key",2);
                startService(mIntent);
                break;
            case R.id.btn3:
                mIntent.putExtra("key",3);
                startService(mIntent);
                break;
        }

    }
}