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These classes provide functionality for the property animation system, which allows you
to animate object properties of any type. <code>int</code>, <code>float</code>, and hexadecimal
color values are supported by default. You can animate any other type by telling the system how
to calculate the values for that given type with a custom {@link android.animation.TypeEvaluator}.
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You can set many different types of interpolators (contained in {@link android.view.animation}),
specify {@link android.animation.Keyframe keyframes}, or group animations to play sequentially
or simultaneously (with {@link android.animation.AnimatorSet}) to further control your animation
behaviors.</p>
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For a guide on how to use the property animation system, see the
<a href="{@docRoot}guide/topics/graphics/animation.html">Animation</a> developer guide.
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