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help .. .why we use invalidate() function twice?

fahimeh hashemian
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I read Hello Android book and i dont understand some parts of the PuzzleView class of the code. invalidate() function is redrawing only a part of page,not redrawing all the page. this is true?
The following function, why do we use invalidate() twice? what is difference between these two?

Thank you for help
I agree. Here's the link:
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