Android翻页效果，电子书(5)

      }    
   
      protected void dispatchDraw(Canvas canvas) {    
              
            Log.v("log dispatchDraw:", "drawing back page"+mPageTurning);    
//        if ((this.mPageTurning) && (this.mPage != null) && (computePageTurn())) {    
          if ((computePageTurn())&& (this.mPageTurning) && (this.mPage != null) ) {    
              this.mPage.setClipPath(this.mForegroundPath);    
          }    
   
          super.dispatchDraw(canvas);    
   
          if (this.mPageTurning) {    
              drawBackground(canvas);    
              drawBackPage(canvas);    
                  
              if (!updateTimeStep()) {    
                  this.mHandler.removeMessages(1);    
                  if (this.mPage != null) {    
                      this.mPage.onPageTurnFinished(canvas);    
                  }    
                  this.mPageTurning = false;    
                  this.mStepping = false;    
                  invalidate();    
              }