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Привет, друг, я новичок в Android, создаю mp3-плеер, мой mp3 работает нормально, у них есть play pause next и pervious control, я хочу сделать то же самое с помощью сервиса, как реализовать это в сервисе для управления медиаплеером, вот мой класс сервисов, можете ли вы сказать мне, как можно воспроизводить и приостанавливать музыку с помощью сервиса? я беру этот код с этого сайтаhttps://www.binpress.com/android-media-style-notifications-media-session-controls

 package music.playerforandroid;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.Rating;
import android.media.session.MediaController;
import android.media.session.MediaSession;
import android.media.session.MediaSessionManager;
import android.os.Build;
import android.os.IBinder;
import android.support.annotation.RequiresApi;
import android.util.Log;
import android.widget.Toast;

public class MediaPlayerService extends Service {

    public static final String ACTION_PLAY = "action_play";
    public static final String ACTION_PAUSE = "action_pause";
    public static final String ACTION_REWIND = "action_rewind";
    public static final String ACTION_FAST_FORWARD = "action_fast_foward";
    public static final String ACTION_NEXT = "action_next";
    public static final String ACTION_PREVIOUS = "action_previous";
    public static final String ACTION_STOP = "action_stop";

    private MediaPlayer mMediaPlayer;
    private MediaSessionManager mManager;
    private MediaSession mSession;
    private MediaController mController;

    MainActivity mainActivity=new MainActivity();


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

    private void handleIntent( Intent intent ) {
        if( intent == null || intent.getAction() == null )
            return;

        String action = intent.getAction();

        if( action.equalsIgnoreCase( ACTION_PLAY ) ) {

            mController.getTransportControls().play();
        }


        else if( action.equalsIgnoreCase( ACTION_PAUSE ) ) {


                 mController.getTransportControls().pause();

        }


        else if( action.equalsIgnoreCase( ACTION_FAST_FORWARD ) ) {
            mController.getTransportControls().fastForward();
        } else if( action.equalsIgnoreCase( ACTION_REWIND ) ) {
            mController.getTransportControls().rewind();
        } else if( action.equalsIgnoreCase( ACTION_PREVIOUS ) ) {
            mController.getTransportControls().skipToPrevious();
        } else if( action.equalsIgnoreCase( ACTION_NEXT ) ) {
            mController.getTransportControls().skipToNext();
        } else if( action.equalsIgnoreCase( ACTION_STOP ) ) {
            mController.getTransportControls().stop();
        }
    }

    private Notification.Action generateAction( int icon, String title, String intentAction ) {
        Intent intent = new Intent( getApplicationContext(), MediaPlayerService.class );
        intent.setAction( intentAction );
        PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 1, intent, 0);
        return new Notification.Action.Builder( icon, title, pendingIntent ).build();
    }

    private void buildNotification( Notification.Action action ) {
        Notification.MediaStyle style = new Notification.MediaStyle();

        Intent intent = new Intent( getApplicationContext(), MediaPlayerService.class );
        intent.setAction( ACTION_STOP );
        PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 1, intent, 0);
        Notification.Builder builder = new Notification.Builder( this )
                .setSmallIcon(R.drawable.ic_music)
                .setContentTitle( "Media Title" )
                .setContentText( "Media Artist" )
                .setDeleteIntent( pendingIntent )
                .setStyle(style);

        builder.addAction( generateAction( android.R.drawable.ic_media_previous, "Previous", ACTION_PREVIOUS ) );
        builder.addAction( generateAction( android.R.drawable.ic_media_rew, "Rewind", ACTION_REWIND ) );
        builder.addAction( action );
        builder.addAction( generateAction( android.R.drawable.ic_media_ff, "Fast Foward", ACTION_FAST_FORWARD ) );
        builder.addAction( generateAction( android.R.drawable.ic_media_next, "Next", ACTION_NEXT ) );
        style.setShowActionsInCompactView(0,1,2,3,4);

        NotificationManager notificationManager = (NotificationManager) getSystemService( Context.NOTIFICATION_SERVICE );
        notificationManager.notify( 1, builder.build() );
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if( mManager == null ) {
            initMediaSessions();
        }

        handleIntent( intent );
        return super.onStartCommand(intent, flags, startId);
    }

    private void initMediaSessions() {
        mMediaPlayer = new MediaPlayer();

        mSession = new MediaSession(getApplicationContext(), "simple player session");
        mController =new MediaController(getApplicationContext(), mSession.getSessionToken());

        mSession.setCallback(new MediaSession.Callback(){
                                 @Override
                                 public void onPlay() {
                                     super.onPlay();
                                     Log.e( "MediaPlayerService", "onPlay");
                                     buildNotification( generateAction( android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE ) );


                                 }

                                 @Override
                                 public void onPause() {
                                     super.onPause();
                                     Log.e( "MediaPlayerService", "onPause");




                                     buildNotification(generateAction(android.R.drawable.ic_media_play, "Play", ACTION_PLAY));

                                 }

                                 @Override
                                 public void onSkipToNext() {
                                     super.onSkipToNext();
                                     Log.e( "MediaPlayerService", "onSkipToNext");
                                     //Change media here
                                     buildNotification( generateAction( android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE ) );
                                 }

                                 @Override
                                 public void onSkipToPrevious() {
                                     super.onSkipToPrevious();
                                     Log.e( "MediaPlayerService", "onSkipToPrevious");
                                     //Change media here
                                     buildNotification( generateAction( android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE ) );
                                 }

                                 @Override
                                 public void onFastForward() {
                                     super.onFastForward();
                                     Log.e( "MediaPlayerService", "onFastForward");
                                     //Manipulate current media here
                                 }

                                 @Override
                                 public void onRewind() {
                                     super.onRewind();
                                     Log.e( "MediaPlayerService", "onRewind");
                                     //Manipulate current media here
                                 }

                                 @Override
                                 public void onStop() {
                                     super.onStop();
                                     Log.e( "MediaPlayerService", "onStop");
                                     //Stop media player here
                                     NotificationManager notificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
                                     notificationManager.cancel( 1 );
                                     Intent intent = new Intent( getApplicationContext(), MediaPlayerService.class );
                                     stopService( intent );
                                 }

                                 @Override
                                 public void onSeekTo(long pos) {
                                     super.onSeekTo(pos);
                                 }

                                 @Override
                                 public void onSetRating(Rating rating) {
                                     super.onSetRating(rating);
                                 }
                             }
        );
    }

    @Override
    public boolean onUnbind(Intent intent) {
        mSession.release();
        return super.onUnbind(intent);
    }

}