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 --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Beginners" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-beginners?hl=en -~----------~----~----~----~------~----~------~--~---
