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diff --git a/android/animation/Keyframes.java b/android/animation/Keyframes.java
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+++ b/android/animation/Keyframes.java
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+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.animation;
+
+import java.util.List;
+
+/**
+ * This interface abstracts a collection of Keyframe objects and is called by
+ * ValueAnimator to calculate values between those keyframes for a given animation.
+ * @hide
+ */
+public interface Keyframes extends Cloneable {
+
+    /**
+     * Sets the TypeEvaluator to be used when calculating animated values. This object
+     * is required only for Keyframes that are not either IntKeyframes or FloatKeyframes,
+     * both of which assume their own evaluator to speed up calculations with those primitive
+     * types.
+     *
+     * @param evaluator The TypeEvaluator to be used to calculate animated values.
+     */
+    void setEvaluator(TypeEvaluator evaluator);
+
+    /**
+     * @return The value type contained by the contained Keyframes.
+     */
+    Class getType();
+
+    /**
+     * Gets the animated value, given the elapsed fraction of the animation (interpolated by the
+     * animation's interpolator) and the evaluator used to calculate in-between values. This
+     * function maps the input fraction to the appropriate keyframe interval and a fraction
+     * between them and returns the interpolated value. Note that the input fraction may fall
+     * outside the [0-1] bounds, if the animation's interpolator made that happen (e.g., a
+     * spring interpolation that might send the fraction past 1.0). We handle this situation by
+     * just using the two keyframes at the appropriate end when the value is outside those bounds.
+     *
+     * @param fraction The elapsed fraction of the animation
+     * @return The animated value.
+     */
+    Object getValue(float fraction);
+
+    /**
+     * @return A list of all Keyframes contained by this. This may return null if this is
+     * not made up of Keyframes.
+     */
+    List<Keyframe> getKeyframes();
+
+    Keyframes clone();
+
+    /**
+     * A specialization of Keyframes that has integer primitive value calculation.
+     */
+    public interface IntKeyframes extends Keyframes {
+
+        /**
+         * Works like {@link #getValue(float)}, but returning a primitive.
+         * @param fraction The elapsed fraction of the animation
+         * @return The animated value.
+         */
+        int getIntValue(float fraction);
+    }
+
+    /**
+     * A specialization of Keyframes that has float primitive value calculation.
+     */
+    public interface FloatKeyframes extends Keyframes {
+
+        /**
+         * Works like {@link #getValue(float)}, but returning a primitive.
+         * @param fraction The elapsed fraction of the animation
+         * @return The animated value.
+         */
+        float getFloatValue(float fraction);
+    }
+}