Sure. I'd start here:
http://developer.android.com/guide/topics/ui/custom-components.html
The layout process involves these three onXXX overrides, as listed in
the table halfway down the page:
||onMeasure(int, int)
||||||onLayout(boolean, int, int, int, int)
||||onSizeChanged(int, int, int, int)
There is documentation for each of these three methods, as well, such as:
http://developer.android.com/reference/android/view/View.html#onSizeChanged(int,
int, int, int)
-- Kostya
06.08.2011 22:54, Matt Tatro пишет:
Kostya,
Any example I could follow?
Kind Regards,
Matt Tatro
T: +1 (281) 905-1008
E: mattta...@gmail.com
-----Original Message-----
From: android-developers@googlegroups.com
[mailto:android-developers@googlegroups.com] On Behalf Of Kostya Vasilyev
Sent: Saturday, August 06, 2011 11:51 AM
To: android-developers@googlegroups.com
Subject: Re: [android-developers] Re: Is there a callback that gets called
right after onResume() ?
Or one could use the tools already provided by the framework ...
... by subclassing a xxxLayout class or a ViewGroup and overriding onMeasure
and onLayout ...
... or by subclassing the appropriate view and overriding onSizeChanged ...
-- Kostya
06.08.2011 20:42, Jim пишет:
There is no callback - you can set flags in onResume() to know when
the activity is done with that part of the lifecycle. However, by
using layout_weight, you're telling Android to decide the size, which
it can't know until the screen is drawn, so a callback to change the
size won't work without a Handler to request a redraw or cycling
through onPause/onResume. So, you're going to need a Handler, which is
effectively a hack (to avoid layout_weight, you can get screen and
view dimensions and other data during onCreate/onStart/onResume to
calculate the available screen space yourself, determine which
elements will show and then calculate/recalculate certain element
sizes to get what you want, but that's a lot of work - a hack is
probably a better approach for this type of job).
If you want to determine the available size, then start a background
thread/timer at the end of onResume(), when you know how much space
you have for your elements, do the size calculations, then
runOnUIThread the changes and you should be fine. If you want to
guarantee the user does not see the changes, you're going to have to
work harder since the background thread/timer is not synchronized with
the UI.
-Jim
On Aug 6, 2:58 am, Zsombor<scythe...@gmail.com> wrote:
Is there a callback that gets a call when everything in the current
Activity got rendered?
Because I need to know the exact sizes of some of my ViewGroups
(their width/height are set using layout_weight in the layout xml),
so I know how many elements fit inside them without scrolling. But I
can only measure them after onResume. Is there a way to do this
without some hack?
--
Kostya Vasilyev
--
You received this message because you are subscribed to the Google Groups "Android
Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
--
Kostya Vasilyev
--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
