7c608f25d4
The animator classes caused autoboxing by converting primitive types (by far the most typical types used in animations) to be converted to their Object equivalents because of various APIs that required Object (like getValue() to get the animated value). This change creates factory methods on some classes instead of the former constructors so that we can create and return private type-specific subclasses which operate directly on the primitive types instead. In particular, float and int are natively supported by the animators now. Support in the APIs for double and long was removed because it seemed like these less common types did not justify the extra baggage of the added API and code. Change-Id: I6008a3883e3d6dd5225005f45f112af148e5a4ea