Can anyone explain me the use of invalidate() function and when it needs to
be called
It marks the entire surface of the view as needing repainting, thus causing
the control to repaint itself at the earliest convenient moment on the UI
thread (once all other UI actions have completed).
You would most likely only need to call this if you have a custom view on
which you are doing manual painting, and the state has changed in such a way
that what is drawn will need changing. Rather than manually try and get the
graphics canvas and paint on the fly, you would call invalidate() so that
the view's onDraw() eventually gets called, the preferred point for doing
custom drawing.
This is equivalent to desktop Java's repaint() call.
--
Jason Teagle
[email protected]
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