从正在运行的线程调用方法

所以我正在尝试制作一个在单独线程上运行的音乐播放器。我希望在Player类(实现Runnable)中有方法来暂停、播放和转到next/prev歌曲。若我要调用线程的内部方法,它还会在单独的线程上运行吗?一切都正常工作,但我对线程还是新手,所以我不确定这是否是好的实践。有人能解释一下吗?

class Player implements Runnable, OnCompletionListener {
    public static final String TAG = "Player";
    private MediaPlayer mp;
    private boolean isPlaying = false;
    private SongsManager sm = null;
    private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
    private int currentSongIndex = 0;

    public Player(int currentSongIndex){
        mp = new MediaPlayer();
        mp.setOnCompletionListener(this);
        sm = new SongsManager();
        songsList = sm.getSongList();
        this.currentSongIndex = currentSongIndex;
    }

    @Override
    public void run() {
        try{
            mp.reset();
            mp.setDataSource(songsList.get(currentSongIndex).get(SongsManager.KEY_PATH));
            mp.prepare();
            mp.start();
            isPlaying = true;
        } catch (IllegalArgumentException e){
            e.printStackTrace();
        } catch (IllegalStateException e){
            e.printStackTrace();
        } catch (IOException e){
            e.printStackTrace();
        }
    }

    public synchronized void pause() {
        if (isPlaying){
            if (mp != null){
                mp.pause();
                isPlaying = false;
            }
        }
    }

    public synchronized void play() {
        if (!isPlaying){
            if (mp != null){
                mp.start();
                isPlaying = true;
            }
        }
    }
    ...
}

所以,如果我像这样创建了一个新线程,

Player player = new Player(0);
playerThread = new Thread(player, Player.TAG);
playerThread.start();

并从另一个线程调用player.pause(),然后调用player.play(),播放器是否仍在单独的线程上运行?