What is the difference between invalidate() and postInvalidate(),
except the obvious (I know that postInvalidate post an invalidate-
request on the UI-thread, while a call to invalidate() invalidates the
View immediately). I've done a ViewGroup with some scrolling-
animations, and to redraw the View from computeScroll(), I needed to
call postInvalidate(), the regular invalidate() does Not redraw the
screen. This is how it's done in ScrollView too, so why isn't the
screen redrawn when I call invalidate() from computeScroll?
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