Like I told you do NOT need to get the numbers in the Java code. You can
simply specify the rotation point to be 50% of the view or 50%p (50% of the
parent.) Here's an example from the ApiDemos:
<scale
android:fromXScale="1.5" android:toXScale="1.0"
android:fromYScale="1.5" android:toYScale="1.0"
android:pivotX="50%" android:pivotY="50%"
android:startOffset="200"
android:duration="100" />
On Thu, Jun 18, 2009 at 4:55 PM, Beth <[email protected]> wrote:
>
> Romain,
>
> So, we understand each other and want the same things :-)
> Can you please provide an example or pseudocode of the animation
> framework doing this job? I'm missing the link between the XML tag
> you suggested and getting the numbers in the code. My animation is
> spinning an ImageView inside a Linear Layout ViewGroup. The View
> Group's center X and Y points are parameters used to set the rotation
> axis. How do I get those numbers?
> What exactly do the attributes look like in XML?
>
> Thanks and regards,
> Beth
>
> On Jun 17, 10:40 pm, Romain Guy <[email protected]> wrote:
> > That's my point, don't try to compute the center position, just let the
> > animation framework do it for you by declaring your animation with the
> > correct values.
> >
> >
> >
> >
> >
> > On Wed, Jun 17, 2009 at 10:17 PM, Beth <[email protected]> wrote:
> >
> > > Thanks Romain.
> > > So, when does the first layout happen? The XML tip looks good but I
> > > cannot see how to use it to determine the centerpoint of my screen in
> > > the Java code. I thought I could get layout components and their
> > > dimensions after setContentView had done its work. My app animates a
> > > simple image view hosted in a Layout that uses the fill_parent width.
> > > Under that is a text view that doesn't move. The width of the
> > > animation is the entire screen and should change when there is a
> > > switch from portrait to landscape. How do I find my center point in a
> > > dynamic way? My current solution is to set up a landscape layout with
> > > a fixed width on the animation view so it is the same as the portrait
> > > orientation. What is the right way?
> >
> > > On Jun 11, 6:08 pm, Romain Guy <[email protected]> wrote:
> > > > You cannot do that from onCreate(), you have to wait for the first
> > > > layout to happen. Besides, you don't need to hard code values in
> > > > animation since you can use values relative to a view, or its parent.
> > > > For instance, in XML, you can use 50%p to say "50% of the size of the
> > > > parent" or 40% to say "40% of the size of the animated view."
> >
> > > > On Thu, Jun 11, 2009 at 4:57 PM, Beth Mezias<[email protected]>
> wrote:
> > > > > Hi there,
> > > > > Can a layout expert offer insight here? I have an animation in a
> > > lovely
> > > > > LinearLayout ViewGroup object that I get into Java from the XML
> using
> > > > > findViewById. It's working great most of the time. However, my
> first
> > > call
> > > > > to the animate function at the end of onCreate measures the width
> of
> > > this
> > > > > ViewGroup to be zero. What am I missing? The same object will
> return
> > > > > correct width measurements later in the thread of execution. How
> can I
> > > get
> > > > > the correct measure from onCreate?
> > > > > Because of this behavior I have hard-coded values into my
> application
> > > for
> > > > > the Center X which might work nicely on the current HTC devices and
> > > then
> > > > > blow up later, or it might look bad in Europe on devices with
> different
> > > > > screen sizes. I tried a number of things to solve this (force
> layout,
> > > varied
> > > > > animation cache persistence, getMeasuredWidth instead of getWidth,
> > > > > invalidate on the ViewGroup and parent). The layout and the
> > > component's
> > > > > measurements should be the same for onCreate as it is in another
> method
> > > in
> > > > > the Activity that responds to touch input from the user. Also note
> > > that if
> > > > > I navigate in the app to another activity, change orientation, and
> then
> > > > > return to the first activity, this scenario also causes the
> ViewGroup's
> > > > > getWidth command to be zero. That is why I assume the issue is
> related
> > > to
> > > > > onCreate.
> > > > > How do I get the correct measure of a (linearlayout) component when
> > > > > executing from onCreate? Is there something in the window's
> drawing
> > > > > sequence that I need to workaround?
> > > > > Any tips or suggestions are most welcome.
> > > > > Regards,
> > > > > Beth
> >
> > > > --
> > > > Romain Guy
> > > > Android framework engineer
> > > > [email protected]
> >
> > > > Note: please don't send private questions to me, as I don't have time
> > > > to provide private support. All such questions should be posted on
> > > > public forums, where I and others can see and answer them
> >
> > --
> > Romain Guy
> > Android framework engineer
> > [email protected]
> >
> > Note: please don't send private questions to me, as I don't have time to
> > provide private support. All such questions should be posted on public
> > forums, where I and others can see and answer them
> >
>
--
Romain Guy
Android framework engineer
[email protected]
Note: please don't send private questions to me, as I don't have time to
provide private support. All such questions should be posted on public
forums, where I and others can see and answer them
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