android.view.View.invalidate(int l, int t, int r, int b) can mark the
the area defined by the rect (l,t,r,b) as needing to be drawn.
But how does View update only the dirty area specified by the rect?
Is it wise enough to redraw only the dirty area even if the onDraw is
customized to update the whole view?

I read some sources and searched in google developer group. No answer
to this question was found.

Would anybody please kindly explain that to me?

Thanks in advance.

FBear

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