While that is indeed a useful tool to have in reserve in one's toolbox
-- generally, as in this case, it's better to set a breakpoint in the
debugger, and have a look around.
Even better, in this case, would be to ALSO set a method entry
breakpoint on View.invalidate(int, int, int, int) -- and maybe on
View.invalidate() and View.invalidate(Rect), though I suspect those
would be redundant. (I tried looking at the disassembled code,
forgetting that the Android.jar in the SDK is purely stubs, but you
can check the source, or just set breakpoints on all three, and if
View.invalidate() and View.invalidate(Rect) are calling
View.invalidate(int, int, int, int) as I expect, eliminate them to
streamline your debugging.
Either something is calling invalidate() for you, or something else is
causing onDraw() to be called, and either way, you'l have your basic
answer in seconds.
Remember, normally you don't call invalidate(...) yourself -- it's
called by the system when it detects that a portion of the screen
needs to be redrawn -- for example, after removing a window from on
top of yours, or a layout change.
Throwing an exception like you suggest is particularly useful when
you're not in a position to directly debug -- for example, logging
rare problems, especially ones that occur in production use. It could
also come in handy if stopping at a breakpoint changes the overall
behavior.
On Feb 3, 2:17 pm, Dan Sherman <impact...@gmail.com> wrote:
> You could see whats calling it with a quick:
>
> try {
> throw new Exception();} catch (Exception e) {
>
> e.printStackTrace();
>
>
>
> }
> On Wed, Feb 3, 2010 at 5:11 PM, jamesc <jame...@gmail.com> wrote:
> > Perhaps you're indirectly calling invalidate() in the onDraw(),
> > resulting in a redraw loop?
>
> > On Feb 3, 10:00 pm, Neilz <neilhorn...@googlemail.com> wrote:
> > > What else can cause onDraw() to be called, if I'm not triggering it
> > > with invalidate()?
>
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