Test your knowledge

1. When rendering specialized graphics for a custom widget, you need to do which of these?
   • Buffer all the rendering in an offscreen Bitmap
   • Set a custom background Drawable
   • Override the onDraw method

2. Where should you create instances of graphics primitives such as Drawable, Paint and Path for rendering in onDraw?
   • On the main thread
   • In the onDraw method
   • Anywhere that doesn't affect onDraw directly
3. What are the two phases involved in the layout process?
   • Layout and then measurement
   • Measurement and then layout
   • Measurement and then rendering
4. When painting a Drawable object, you need to do which of the following?
   • Pass it a valid Canvas object
   • Use Canvas.paintDrawable
   • Invoke its onDraw method
5. To tell the platform that a widget needs to repaint itself (from the main thread), you use which of these?
   • View.redraw()
   • View.invalidate()
   • View.repaint()