ObjectAnimator does not proxy View properties when created from PropertyValuesHolder

[dlew]

I noticed this when I switched my code from using multiple ObjectAnimators to using a single ObjectAnimator + multiple PropertyValuesHolders.

This code will work:

ObjectAnimator.ofFloat(myView, "alpha", 0f, 1f).start();

This code will not work:

PropertyValuesHolder pvh = PropertyValuesHolder.ofFloat("alpha", 0f, 1f);
ObjectAnimator.ofPropertyValuesHolder(myView, pvh).start();

The culprit is pretty obvious, you see this in LogCat:

E/PropertyValuesHolder(4615): Couldn't find setter/getter for property alpha with value type float

It seems to me that PVH should be able to proxy a View's properties just as well as a vanilla ObjectAnimator. Obviously it's an extra layer of indirection but if ObjectAnimator can do it, PropertyValuesHolder should be able to do so as well.

[scottdweber]

It seems like this ought to be built into the library, but there is a workaround:

PropertyValuesHolder pvh = PropertyValuesHolder.ofFloat("alpha", 0f, 1f);
ObjectAnimator.ofPropertyValuesHolder(AnimatorProxy.NEEDS_PROXY ?
        AnimatorProxy.wrap(myView) : myView, pvh).start();