java - 在偏好中存储音乐ON/OFF状态-LibGdx

Question

我有这样的音乐按钮:

private void drawMusicButton() {
    musicButton = new ImageButton(new TextureRegionDrawable(musicTexture1),new TextureRegionDrawable(musicTexture2), new TextureRegionDrawable(musicTexture2));
    musicButton.setChecked(!game.menuMusicBool);
    stage.addActor(musicButton);

    musicButton.setPosition(UiConstants.MUSIC_X, UiConstants.MUSIC_Y, Align.bottom);
    musicButton.addListener(new ChangeListener() {
        @Override
        public void changed(ChangeEvent event, Actor actor) {
            if (!game.buttonClickSoundBool&&game.soundBool)
                buttonClickSound.play();
            if (game.menuMusicBool)
                game.menuMusicBool = false;
            else
                game.menuMusicBool = true;
            musicStateManager.saveMusicState();
        }
    });
}

最初 menuMusicBool 为 true。

public boolean menuMusicBool = true;

我想优先存储音乐开/关状态，以便在重新启动游戏时，我可以获取之前选择的状态。

我的偏好类别是这样的:

public class MusicStateManager {

  private final Preferences prefs;
  public final Mgame game;

  private static final String MUSIC_STATE = "musicState";

  public MusicStateManager(Mgame game){
      this.game = game;
      prefs = Gdx.app.getPreferences(Mgame.class.getName());
  }

  public void getPreferenceValues(){ }

  public void reset(){ }

  public void saveMusicState() {

    prefs.putBoolean(MUSIC_STATE, game.menuMusicBool);
    prefs.flush();
  }

  public void getMusicState() {
     game.menuMusicBool = prefs.getBoolean(MUSIC_STATE);
  } 

getMusicState() 我在 render() 内部调用。

但优先考虑的是，值(value)没有得到正确存储。我无法在退出并重新启动游戏时保存之前的状态。

我在代码中做错了什么？

Answer 1

public class MusicStateManager {

  private final Preferences prefs;
  public final Mgame game;

  private static final String PREF_NAME ="APP_NAME";   
  private static final String MUSIC_STATE = "musicState";

  public MusicStateManager(Mgame game){
      this.game = game;
      prefs = Gdx.app.getPreferences(PREF_NAME);
      game.menuMusicBool = prefs.getBoolean(MUSIC_STATE, true); // return true when key not found
  }

  public void saveMusicState(boolean musicState) {
    game.menuMusicBool = musicState;
    prefs.putBoolean(MUSIC_STATE, musicState);
    prefs.flush();

    // music state changed and saved, now need to start or stop music
    if(game.menuMusicBool)    // I supposed game having music object reference
         game.music.play();
    else 
         game.music.stop(); 
  }

  public boolean getMusicState() {
     return prefs.getBoolean(MUSIC_STATE);
  }

当你想播放音乐时，使用game.menuMusicBool作为标志

public void playMusic(Music music){

    if(game.menuMusicBool && !music.isPlaying()){
         music.play();
         music.setLooping(true);
     }
}

以及musicButton的内部监听器

musicButton.addListener(new ChangeListener() {
    @Override
    public void changed(ChangeEvent event, Actor actor) {
        if (!game.buttonClickSoundBool&&game.soundBool)
            buttonClickSound.play();
         musicStateManager.saveMusicState(!game.menuMusicBool);  // state inversed and saved in prefs
    }
});