Android ScaleAnimation

Question

I'd like to grow a view with each click using a ScaleAnimation. I've managed the effects of the animation persist after it has finished with the fillAfter, but the problem now is, the animation always starts from state 0 (as the View is defined in the XML) - on click the view resets and animates back to the state it was just after the first animation.

The animation is defined in an XML:

<scale xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_decelerate_interpolator" android:fromXScale="1" android:toXScale="1.5" android:fromYScale="1" android:toYScale="1.5" android:pivotX="50%" android:pivotY="50%" android:duration="1000" android:fillAfter="true" />

Answer 1

How exactly is the animation defined?

When defining ScaleAnimation with Java code, you can set fromX/fromY (look here) starting scaling factors, so I assume you can do the same with XML attributes.

Answer 2

I solved the issue by not resorting to animation defined in the XML, but rather doing

anim = new ScaleAnimation(from, to, from, to, Animation.RELATIVE_TO_SELF, (float)0.5, Animation.RELATIVE_TO_SELF, (float)0.5);

and adjusting from/to each time I needed to expand it. I'm not so sure that's a good thing regarding performance, but it works nicely.