Graphics and Animations

Go to Mind Mup: Graphics and Animations

Graphic and Animations

• Animation
  • TransitionDrawable: Fade 1 drawable to another drawable
    • <transition> <item> </item> <item> </item> </transition>
  • AnimationDrawable: drawable slide show
    • <animation-list> <item> </item> .... .... </animation-list>
  • Animation: Animate the size, orientation, position of a view
    • <set> alpha: fade in/out rotate translate scale <set>
• drawables
  • Shapes (xml)
  • Images (png)
• Canvas
  • Generic View less frequent updates
  • SurfaceView More frequent updates
    • provide a secondary thread for drawing
      • 1- SETUP
        • Acquire the surface holder getHolder()
        • Register the surface view for call backs addCallBack() These callbacks are (called usually from main thread): surfaceCreated() surfaceChanged() surfaceDestroyed()
        • Create the secondary thread
      • 2- DRAW
        • Acquire lock on CANVAS: SurfaceHolder.lockCanvas()
        • Draw: Canvas.drawBitmap()
        • Unlock the canvas, allowing android to update and display: SurfaceHolder.unlockCanvasAndPost