Question

QUESTION 1 Which of the following methods would be implemented by the developer when drawing customized...


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


Engineering   Computer-Science   
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Homework Answers

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.

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