java - 即使编程为 MediaPlayer 也不会停止播放

Question

我制作了一个简单的类来处理与声音相关的所有事情。有添加、播放、停止、释放和释放全部。它的工作原理是您必须添加一首歌曲，然后调用 play 并传递您添加的歌曲的名称。任何时候你需要停止，只需调用停止函数并将歌曲名称作为参数传递，它就会停止。我的问题是即使它通过 stop() 也没有停止。

声级:

public class Sound
{
    private Map<String, MediaPlayer> songs = new HashMap<String, MediaPlayer>();

    private MediaPlayer currentlyPlayingSong;

    public Sound() {}

    public void Add(int songId, String songName, Context context)
    {
        MediaPlayer song = MediaPlayer.create(context, songId);

        songs.put(songName, song);
    }

    public void Play(String name, boolean shouldLoop)
    {
        MediaPlayer songToPlay = songs.get(name);

        if ( songToPlay != currentlyPlayingSong && songToPlay != null) 
    {
        currentlyPlayingSong = songToPlay;

        currentlyPlayingSong.start();

        currentlyPlayingSong.setLooping(shouldLoop);
    }
    }

    public void Stop(String name)
    {
        MediaPlayer songToStop = songs.get(name);
        if (songToStop != null)
        {
            songToStop.setLooping(false);

            songToStop.stop();
        }
    }

    public void Release(String name)
    {
        songs.get(name).release();
    }

    public void ReleaseAll()
    {
       LinkedList<MediaPlayer> _songs;

        _songs = (LinkedList)songs.values();

        for (int i = 0; i < _songs.size(); i++)
        {
            _songs.get(i).release();
        }
    }
}

在 Activity 的 OnCreate 上，我调用 Add，然后调用 Play。在我尝试从 fragment 调用 Stop 之前，一切都很好。运行没有任何错误或异常，它不会停止。

Activity :

public class Main extends ActionBarActivity
{
   private Sound sound = new Sound();

   private static boolean isSoundOn = true;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        isSoundOn = true;

        sound.Add(R.raw.drajamainmenueddited, "mainMenuSong", this);

        //endregion

        //Hide upper action bar
        getSupportActionBar().hide();

            if (isSoundOn)
                sound.Play("mainMenuSong", true);
    }


    public void SetIsSoundOn(Boolean isOn)
    {
        isSoundOn = isOn;
    }

    public boolean GetIsSoundOn()
    {
       return isSoundOn;
    }

    public Sound GetSoundObj()
    {
        return sound;
    }
}

fragment :

public class MainMenuFragment extends Fragment {

    private ImageButton soundImgBtn;

    private FragmentConfig fragmentConfig;

    public MainMenuFragment()
    {
        fragmentConfig = new FragmentConfig();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState)
    {
        //region Initiators
        View  view = inflater.inflate(R.layout.fragment_main_menu, container, false);

        soundImgBtn = (ImageButton)view.findViewById(R.id.soundImgBtn);
        //endregion

        //region Listeners

        soundImgBtn.setOnClickListener(
                new View.OnClickListener()
                {
                    @Override
                    public void onClick(View v)
                    {
                        SoundImgBtnClick(v);
                    }
                }
        );
        //endregion

        //Changes audio img
        if (((Main)getActivity()).GetIsSoundOn())
            soundImgBtn.setImageResource(android.R.drawable.ic_lock_silent_mode_off);

        else
            soundImgBtn.setImageResource(android.R.drawable.ic_lock_silent_mode);

        // Inflate the layout for this fragment
        return view;
    }

    private void SoundImgBtnClick(View v)
    {
        //if sound is on and clicked, turn off
        if (((Main)getActivity()).GetIsSoundOn())
        {
            ((Main)getActivity()).SetIsSoundOn(false);

            ((Main)getActivity()).GetSoundObj().Stop("mainMenuSong");

            soundImgBtn.setImageResource(android.R.drawable.ic_lock_silent_mode);
        }

        else
        {
            ((Main)getActivity()).SetIsSoundOn(true);

            ((Main)getActivity()).GetSoundObj().Play("mainMenuSong", true);

            soundImgBtn.setImageResource(android.R.drawable.ic_lock_silent_mode_off);
        }
    }

}

我想做的是模拟一个静音按钮。单击后，所有声音都应静音。

到目前为止，这几乎是我编写的所有代码。

干杯。

Answer 1

我怀疑您使用的是 MediaPlayer 的不同实例。你可以这样做，但你必须在同一时间停止这首歌。 关于 Add() 中的代码:

MediaPlayer song = MediaPlayer.create(context, songId);

在 Stop() 中:

MediaPlayer songToStop = songs.get(name)

注意:

• 以上代码告诉我您正在为同一首歌曲使用 MediaPlayer 的不同实例。对象 song 需要在更高的范围内声明，以便您访问它并停止播放歌曲。
• 需要在stop()之后调用release()方法来释放资源。