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diff --git a/android/view/animation/AccelerateInterpolator.java b/android/view/animation/AccelerateInterpolator.java
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+++ b/android/view/animation/AccelerateInterpolator.java
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+/*
+ * Copyright (C) 2006 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.view.animation;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.content.res.Resources.Theme;
+import android.content.res.TypedArray;
+import android.util.AttributeSet;
+
+import com.android.internal.R;
+import com.android.internal.view.animation.HasNativeInterpolator;
+import com.android.internal.view.animation.NativeInterpolatorFactory;
+import com.android.internal.view.animation.NativeInterpolatorFactoryHelper;
+
+/**
+ * An interpolator where the rate of change starts out slowly and
+ * and then accelerates.
+ *
+ */
+@HasNativeInterpolator
+public class AccelerateInterpolator extends BaseInterpolator implements NativeInterpolatorFactory {
+    private final float mFactor;
+    private final double mDoubleFactor;
+
+    public AccelerateInterpolator() {
+        mFactor = 1.0f;
+        mDoubleFactor = 2.0;
+    }
+
+    /**
+     * Constructor
+     *
+     * @param factor Degree to which the animation should be eased. Seting
+     *        factor to 1.0f produces a y=x^2 parabola. Increasing factor above
+     *        1.0f  exaggerates the ease-in effect (i.e., it starts even
+     *        slower and ends evens faster)
+     */
+    public AccelerateInterpolator(float factor) {
+        mFactor = factor;
+        mDoubleFactor = 2 * mFactor;
+    }
+
+    public AccelerateInterpolator(Context context, AttributeSet attrs) {
+        this(context.getResources(), context.getTheme(), attrs);
+    }
+
+    /** @hide */
+    public AccelerateInterpolator(Resources res, Theme theme, AttributeSet attrs) {
+        TypedArray a;
+        if (theme != null) {
+            a = theme.obtainStyledAttributes(attrs, R.styleable.AccelerateInterpolator, 0, 0);
+        } else {
+            a = res.obtainAttributes(attrs, R.styleable.AccelerateInterpolator);
+        }
+
+        mFactor = a.getFloat(R.styleable.AccelerateInterpolator_factor, 1.0f);
+        mDoubleFactor = 2 * mFactor;
+        setChangingConfiguration(a.getChangingConfigurations());
+        a.recycle();
+    }
+
+    public float getInterpolation(float input) {
+        if (mFactor == 1.0f) {
+            return input * input;
+        } else {
+            return (float)Math.pow(input, mDoubleFactor);
+        }
+    }
+
+    /** @hide */
+    @Override
+    public long createNativeInterpolator() {
+        return NativeInterpolatorFactoryHelper.createAccelerateInterpolator(mFactor);
+    }
+}