Thanks. that answers my question.
On Apr 13, 1:40 pm, Dianne Hackborn <hack...@android.com> wrote:
> Actually it's not nearly so smart -- it is just a traversal through the view
> hierarchy until it finds a matching id.
>
> As with all things, you should avoid doing this repeatedly if you don't need
> to (keep the thing you find in a variable so you don't have to look it up
> again). For more subtle performance questions, the profiler is really what
> you need to use.
>
> On Mon, Apr 13, 2009 at 10:09 AM, Michael Bollmann <
>
>
>
> michael.bollm...@googlemail.com> wrote:
>
> > I guess findViewById uses some kind of map implementation with O(log
> > n)
> > So my guess is that it's about 100-200 compared to 0 when you use
> > member access.
>
> > On Apr 13, 6:40 pm, Alexey <avolo...@gmail.com> wrote:
> > > yeah, that reference doesn't have number i'm looking for.
>
> > > On Apr 13, 11:20 am, Michael Bollmann
>
> > > <michael.bollm...@googlemail.com> wrote:
> > > > It depends on how often you call it and what your app is doing anyway.
> > > > Now matter how good it's implementation is access to a member variable
> > > > is always much faster than a function call.
> > > > On the other hand you might not notice any improvement in case your
> > > > app does some stuff that takes
> > > > 1000 times longer than a call to findViewById.
>
> > > > Take a look at this:
> >http://developer.android.com/guide/practices/design/performance.html#...
>
> > > > On Apr 13, 6:04 pm, Alexey <avolo...@gmail.com> wrote:
>
> > > > > Hi all, trying to find some performance numbers for findViewById -
> > > > > need to convince to change bunch of the findViewById for the same
> > > > > widget to member variable with just one findViewById on create . Or
> > > > > may be i'm wrong and it's fine ?
>
> --
> Dianne Hackborn
> Android framework engineer
> hack...@android.com
>
> Note: please don't send private questions to me, as I don't have time to
> provide private support, and so won't reply to such e-mails. All such
> questions should be posted on public forums, where I and others can see and
> answer them.
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