MyBindService.class

package com.example.myapplication;

import android.app.Service;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Binder;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;

public class MyBindService extends Service {
    @Override
    public void onCreate() {
        Log.i("info", "bind onCreate");
        super.onCreate();
    }
    @Override
    public void unbindService(ServiceConnection conn) {
        Log.i("info", "bind unbindService");
        super.unbindService(conn);
    }

    @Override
    public void onDestroy() {
        Log.i("info", "bind onDestroy");
        super.onDestroy();
    }

    public class MyBinder extends Binder {
        public MyBindService getService() {
            return MyBindService.this;
        }
    }
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        Log.i("info", "bind onBind");
        return new MyBinder();
    }

    public void Play() {
        Log.i("info", "播放");
    }
    public void Pause() {
        Log.i("info", "暂停");
    }
    public void Shang() {
        Log.i("info", "上首");
    }
    public void Next() {
        Log.i("info", "下首");
    }
}

Activity

package com.example.myapplication;

import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {
    Intent intent;
    MyBindService service;
    ServiceConnection connection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder binder) {
            service=((MyBindService.MyBinder)binder).getService();
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void doClick(View v) {
        intent = new Intent(MainActivity.this, MyBindService.class);
        switch (v.getId()) {
            case R.id.bind:
                bindService(intent,connection, Service.BIND_AUTO_CREATE);
                break;
            case R.id.unbind:
                unbindService(connection);
                break;
            case R.id.play:
                service.Play();
                break;
            case R.id.pause:
                service.Pause();
                break;
            case R.id.shang:
                service.Shang();
                break;
            case R.id.next:
                service.Next();
                break;
        }
    }
}

Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".MyBindService"></service>
    </application>

</manifest>