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POScale a view and its layered subviews relatively
 

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    <p>(This is somewhat a follow-up on <a href="https://stackoverflow.com/questions/3744854">Android: How do you scale multiple views together?</a>)</p> <p>My task is to port an iPhone / iPad app on Android that consists of a simple image view on which animations are layered on top in absolute positions. While this sounds rather easy on iOS where you only have to target a few possible screen sizes, it gets rather messy with Android.</p> <p>My current setup is this: A RelativeLayout in which I place my main (background) image on left = 0, top = 0 and multiple ViewFlipper instances used as "animation containers" that are positioned relatively to the upper left corner of the parent layout instance.</p> <p>This approach has two basic problems:</p> <ol> <li><p>The positioned "animations" are mis-positioned as soon as the actual size of the layout does not match the size of the main background image.</p></li> <li><p>The positioned "animations" are also mis-sized, because since they usually have "enough space" around themselves, Android doesn't scale them to fit into the RelativeLayout (nor would it scale them relatively to the original background.</p></li> </ol> <p>Since the animations itself must be interactive, its not a solution to place and position all of the animations on a transparent layer that has the same size as the main (background) image, as they'd overlap each other and only the upper-most would be interactive at all.</p> <p>I thought of different solutions:</p> <ol> <li><p>To get the the scale factor of the main image, I could retrieve its <code>measuredWidth</code> and <code>measuredHeight</code> and set this into relation of the original <code>width</code> and <code>height</code> of the view. Then I'd use this scale factor for custom positioning and eventually custom scaling. But, apparently the <code>measuredWidth/-Height</code> properties are only set during the <a href="http://developer.android.com/reference/android/view/View.html#onMeasure%28int,%20int%29" rel="nofollow noreferrer">onMeasure()</a> call and this is called after the component tree was built, so I don't know if this solution is feasible at all.</p></li> <li><p>Implement my own layout manager and scale / position the views accordingly. I had a look at the implementation of <code>RelativeLayout</code>, but have to admit that the <a href="http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.3.4_r1/android/widget/RelativeLayout.java#299" rel="nofollow noreferrer">onMeasure()</a> method scares me a bit.</p></li> </ol> <p>What would you do in my case? Is there anything I haven't yet taken into account?</p> <p>Thanks in advance.</p>
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