Question

QUESTION 1

Which of the following methods would be implemented by the developer when drawing customized 2-D Graphics on a View?


a.invalidate

b.draw


c.onDraw


d.drawSquare


QUESTION 2

Which of the following methods will correctly request a re-drawing of the customized 2-D graphics on a View object once this specified method is invoked?


a.draw


b.invalidate


c.onDraw


d.validate



QUESTION 3

What type of object is passed to the onDraw method and is used for drawing customized graphics on the View?


a.Graphics?



b.Canvas?



c. CoreGraphicsContext?



d. View?


QUESTION 4

The overriden View's onDraw method can be invoked directly from any method outside of the Customized View's class.



a.True



b.False


Answer 1

1) c. onDraw()

Reason. onDraw() can be used by view to draw itself.

2) b. invalidate ()

Reason: invalidate() correctly request a re-drawing of the customized 2-D graphics on a View object once this specified method is invoked.

3) b. Canvas

Reason: Canvas object is passed to the onDraw method and is used for drawing customized graphics on the View.

4) False

Reason: The overriden View's onDraw method cannot be invoked directly from any method outside of the Customized View's class.