Android Open Source - things-fall-down Scene Manager

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License

The source code is released under:

MIT License

Java Source Code

package com.github.thingsfalldown.manager;
/*from   w w w  .  j  av  a 2s .c o  m*/
import org.andengine.engine.Engine;
import org.andengine.engine.handler.timer.ITimerCallback;
import org.andengine.engine.handler.timer.TimerHandler;
import org.andengine.ui.IGameInterface.OnCreateSceneCallback;

import com.github.thingsfalldown.scene.GameScene;
import com.github.thingsfalldown.scene.LoadingScene;
import com.github.thingsfalldown.scene.MainMenuScene;
import com.github.thingsfalldown.scene.LogoScene;
import com.github.thingsfalldown.template.TemplateScene;

/**
 * The SceneManager class handles switching between all of our screens,
 * including loading and disposing of all screen resources.
 */
public class SceneManager {
  private TemplateScene logoScene;
  private TemplateScene menuScene;
  private TemplateScene gameScene;
  private TemplateScene loadingScene;
  
  private static final SceneManager INSTANCE = new SceneManager();
  private SceneType currentSceneType = SceneType.SCENE_LOGO;
  private TemplateScene currentScene;
  private Engine engine = ResourceManager.getInstance().engine;
  
  public enum SceneType {
    SCENE_LOGO,
    SCENE_MENU,
    SCENE_GAME,
    SCENE_LOADING
  }
  
  /**
   * Set the current scene by relying on the child class's scene type
   * 
   * @param scene  the generic scene
   */
  public void setScene(TemplateScene scene) {
    engine.setScene(scene);
    currentScene = scene;
    currentSceneType = scene.getSceneType();
  }
  
  /**
   * Set our scene to the given SceneType enum
   * 
   * @param sceneType  the scene to set
   */
  public void setScene(SceneType sceneType) {
    switch (sceneType) {
      case SCENE_MENU:
        setScene(menuScene);
        break;
      case SCENE_GAME:
        setScene(gameScene);
        break;
      case SCENE_LOGO:
        setScene(logoScene);
        break;
      case SCENE_LOADING:
        setScene(loadingScene);
        break;
      default:
        break;
    }
  }
  
  /**
   * @return the singleton scene manager
   */
  public static SceneManager getInstance() {
    return INSTANCE;
  }
  
  /**
   * @return the currently assigned scene type
   */
  public SceneType getCurrentSceneType() {
    return currentSceneType;
  }
  
  /**
   * @return the current scene
   */
  public TemplateScene getCurrentScene() {
    return currentScene;
  }
  
  /**
   * Load the logo screen resources and create the screen.
   * 
   * @param pOnCreateSceneCallback
   */
  public void createLogoScreen(OnCreateSceneCallback pOnCreateSceneCallback) {
    ResourceManager.getInstance().loadLogoResources();
    logoScene = new LogoScene();
    currentScene = logoScene;
    pOnCreateSceneCallback.onCreateSceneFinished(logoScene);
  }
  
  /**
   * Destroy all the logo sceen resources.
   */
  private void disposeLogoScene() {
    ResourceManager.getInstance().unloadLogoScreen();
    logoScene.disposeScene();
    logoScene = null;
  }
  
  /**
   * Load menu and loading screen resources, and create the scenes.
   * We create the loading screen so that we may quickly switch to it once
   * we click a button.
   */
  public void createMenuScene() {
    ResourceManager.getInstance().loadMenuResources();
    menuScene = new MainMenuScene();
    loadingScene = new LoadingScene();
    setScene(menuScene);
    disposeLogoScene();
  }
  
  /**
   * Show the loading screen while we dispose of existing scenes and show the menu.
   * 
   * @param mEngine
   */
  public void loadMenuScene(final Engine mEngine) {
    setScene(loadingScene);
    gameScene.disposeScene();
    ResourceManager.getInstance().unloadGameTextures();
    mEngine.registerUpdateHandler(new TimerHandler(0.1f, new ITimerCallback() {
      public void onTimePassed(final TimerHandler pTimerHandler) {
        mEngine.unregisterUpdateHandler(pTimerHandler);
        ResourceManager.getInstance().loadMenuTextures();
        setScene(menuScene);
      }
    }));
  }
  
  /**
   * Show the loading screen while we dispose of existing scenes and show the game.
   * 
   * @param mEngine
   */
  public void loadGameScene(final Engine mEngine) {
    setScene(loadingScene);
    ResourceManager.getInstance().unloadMenuTextures();
    mEngine.registerUpdateHandler(new TimerHandler(0.1f, new ITimerCallback() {
      public void onTimePassed(final TimerHandler pTimerHandler) {
        mEngine.unregisterUpdateHandler(pTimerHandler);
        ResourceManager.getInstance().loadGameResources();
        gameScene = new GameScene();
        setScene(gameScene);
      }
    }));
  }
}

Java Source Code List

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