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java实现菜单滑动效果

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菜单滑动效果的实现 。

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public class MenuScrollerActivity extends BaseGameActivity implements IScrollDetectorListener, IOnSceneTouchListener, IClickDetectorListener {
    
     // ===========================================================
     // Constants
     // ===========================================================
     protected static int CAMERA_WIDTH = 480 ;
     protected static int CAMERA_HEIGHT = 320 ;
 
     protected static int FONT_SIZE = 24 ;
     protected static int PADDING = 50 ;
     
     protected static int MENUITEMS = 7 ;
     
 
     // ===========================================================
     // Fields
     // ===========================================================
     private Scene mScene;
     private Camera mCamera;
 
     private Font mFont;
     private BitmapTextureAtlas mFontTexture;  
     
     private BitmapTextureAtlas mMenuTextureAtlas;   
     private TextureRegion mMenuLeftTextureRegion;
     private TextureRegion mMenuRightTextureRegion;
     
     private Sprite menuleft;
     private Sprite menuright;
 
     // Scrolling
     private SurfaceScrollDetector mScrollDetector;
     private ClickDetector mClickDetector;
 
     private float mMinX = 0 ;
     private float mMaxX = 0 ;
     private float mCurrentX = 0 ;
     private int iItemClicked = - 1 ;
     
     private Rectangle scrollBar;   
     private List<TextureRegion> columns = new ArrayList<TextureRegion>();
 
     // ===========================================================
     // Constructors
     // ===========================================================
 
     // ===========================================================
     // Getter & Setter
     // ===========================================================
 
     // ===========================================================
     // Methods for/from SuperClass/Interfaces
     // ===========================================================
 
     @Override
     public void onLoadResources() {
         // Paths
         FontFactory.setAssetBasePath( "font/" );
         BitmapTextureAtlasTextureRegionFactory.setAssetBasePath( "gfx/" );
 
         // Font
         this .mFontTexture = new BitmapTextureAtlas( 256 , 256 );
         this .mFont = FontFactory.createFromAsset( this .mFontTexture, this , "Plok.TTF" , FONT_SIZE, true , Color.BLACK);
         this .mEngine.getTextureManager().loadTextures( this .mFontTexture);
         this .mEngine.getFontManager().loadFonts( this .mFont);
         
         //Images for the menu
         for ( int i = 0 ; i < MENUITEMS; i++) {       
           BitmapTextureAtlas mMenuBitmapTextureAtlas = new BitmapTextureAtlas( 256 , 256 , TextureOptions.BILINEAR_PREMULTIPLYALPHA);
           TextureRegion mMenuTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(mMenuBitmapTextureAtlas, this , "menu" +i+ ".png" , 0 , 0 );
           
           this .mEngine.getTextureManager().loadTexture(mMenuBitmapTextureAtlas);
           columns.add(mMenuTextureRegion);
           
           
         }
         //Textures for menu arrows
         this .mMenuTextureAtlas = new BitmapTextureAtlas( 128 , 128 , TextureOptions.BILINEAR_PREMULTIPLYALPHA);
         this .mMenuLeftTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(mMenuTextureAtlas, this , "menu_left.png" , 0 , 0 );
         this .mMenuRightTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(mMenuTextureAtlas, this , "menu_right.png" , 64 , 0 );
         this .mEngine.getTextureManager().loadTexture(mMenuTextureAtlas);
      
     }
 
     @Override
     public Engine onLoadEngine() {
         this .mCamera = new Camera( 0 , 0 , CAMERA_WIDTH, CAMERA_HEIGHT);
 
         final EngineOptions engineOptions = new EngineOptions( true , ScreenOrientation.LANDSCAPE, new FillResolutionPolicy(), this .mCamera);
         engineOptions.getTouchOptions().setRunOnUpdateThread( true );
 
         final Engine engine = new Engine(engineOptions);
         return engine;
     }
 
     @Override
     public Scene onLoadScene() {
         this .mEngine.registerUpdateHandler( new FPSLogger());
 
         this .mScene = new Scene();
         this .mScene.setBackground( new ColorBackground( 0 , 0 , 0 ));
        
         this .mScrollDetector = new SurfaceScrollDetector( this );
         this .mClickDetector = new ClickDetector( this );
 
         this .mScene.setOnSceneTouchListener( this );
         this .mScene.setTouchAreaBindingEnabled( true );
         this .mScene.setOnSceneTouchListenerBindingEnabled( true );
 
         CreateMenuBoxes();
 
         return this .mScene;
 
     }
 
     @Override
     public boolean onSceneTouchEvent( final Scene pScene, final TouchEvent pSceneTouchEvent) {
         this .mClickDetector.onTouchEvent(pSceneTouchEvent);
         this .mScrollDetector.onTouchEvent(pSceneTouchEvent);
         return true ;
     }
 
     @Override
     public void onScroll( final ScrollDetector pScollDetector, final TouchEvent pTouchEvent, final float pDistanceX, final float pDistanceY) {
 
         //Disable the menu arrows left and right (15px padding)
         if (mCamera.getMinX()<= 15 )
            menuleft.setVisible( false );
          else
            menuleft.setVisible( true );
         
          if (mCamera.getMinX()>mMaxX- 15 )
            menuright.setVisible( false );
          else
            menuright.setVisible( true );
           
         //Return if ends are reached
         if ( ((mCurrentX - pDistanceX) < mMinX) ){         
           return ;
         } else if ((mCurrentX - pDistanceX) > mMaxX){
           
           return ;
         }
         
         //Center camera to the current point
         this .mCamera.offsetCenter(-pDistanceX, 0 );
         mCurrentX -= pDistanceX;
           
        
         //Set the scrollbar with the camera
         float tempX =mCamera.getCenterX()-CAMERA_WIDTH/ 2 ;
         // add the % part to the position
         tempX+= (tempX/(mMaxX+CAMERA_WIDTH))*CAMERA_WIDTH;  
         //set the position
         scrollBar.setPosition(tempX, scrollBar.getY());
         
         //set the arrows for left and right
         menuright.setPosition(mCamera.getCenterX()+CAMERA_WIDTH/ 2 -menuright.getWidth(),menuright.getY());
         menuleft.setPosition(mCamera.getCenterX()-CAMERA_WIDTH/ 2 ,menuleft.getY());
         
        
         
         //Because Camera can have negativ X values, so set to 0
         if ( this .mCamera.getMinX()< 0 ){
           this .mCamera.offsetCenter( 0 , 0 );
           mCurrentX= 0 ;
         }
         
 
     }
 
     @Override
     public void onClick(ClickDetector pClickDetector, TouchEvent pTouchEvent) {
         loadLevel(iItemClicked);
     };
 
     // ===========================================================
     // Methods
     // ===========================================================
     
     private void CreateMenuBoxes() {
       
        int spriteX = PADDING;
        int spriteY = PADDING;
       
        //current item counter
        int iItem = 1 ;
 
        for ( int x = 0 ; x < columns.size(); x++) {
         
          //On Touch, save the clicked item in case it's a click and not a scroll.
          final int itemToLoad = iItem;
         
          Sprite sprite = new Sprite(spriteX,spriteY,columns.get(x)){
           
            public boolean onAreaTouched( final TouchEvent pSceneTouchEvent, final float pTouchAreaLocalX, final float pTouchAreaLocalY) {
              iItemClicked = itemToLoad;
              return false ;
            }          
          };        
          iItem++;
         
         
          this .mScene.attachChild(sprite);        
          this .mScene.registerTouchArea(sprite);        
  
          spriteX += 20 + PADDING+sprite.getWidth();
       }
       
        mMaxX = spriteX - CAMERA_WIDTH;
       
        //set the size of the scrollbar
        float scrollbarsize = CAMERA_WIDTH/((mMaxX+CAMERA_WIDTH)/CAMERA_WIDTH);
        scrollBar = new Rectangle( 0 ,CAMERA_HEIGHT- 20 ,scrollbarsize, 20 );
        scrollBar.setColor( 1 , 0 , 0 );
        this .mScene.attachChild(scrollBar);
       
        menuleft = new Sprite( 0 ,CAMERA_HEIGHT/ 2 -mMenuLeftTextureRegion.getHeight()/ 2 ,mMenuLeftTextureRegion);
        menuright = new Sprite(CAMERA_WIDTH-mMenuRightTextureRegion.getWidth(),CAMERA_HEIGHT/ 2 -mMenuRightTextureRegion.getHeight()/ 2 ,mMenuRightTextureRegion);
        this .mScene.attachChild(menuright);
        menuleft.setVisible( false );
        this .mScene.attachChild(menuleft);
     }
     
     
 
     @Override
     public void onLoadComplete() {
 
     }
 
     //Here is where you call the item load.
     private void loadLevel( final int iLevel) {
         if (iLevel != - 1 ) {
             runOnUiThread( new Runnable() {
                 @Override
                 public void run() {
                       
                     Toast.makeText(MenuScrollerActivity. this , "Load Item" + String.valueOf(iLevel), Toast.LENGTH_SHORT).show();
                     iItemClicked = - 1 ;
                 }
             });
         }
     }
}

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