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diff --git a/core/java/android/view/animation/AccelerateInterpolator.java b/core/java/android/view/animation/AccelerateInterpolator.java
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+++ b/core/java/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.TypedArray;
+import android.util.AttributeSet;
+
+/**
+ * An interpolator where the rate of change starts out slowly and 
+ * and then accelerates.
+ *
+ */
+public class AccelerateInterpolator implements Interpolator {
+    public AccelerateInterpolator() {
+    }
+    
+    /**
+     * 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;
+    }
+    
+    public AccelerateInterpolator(Context context, AttributeSet attrs) {
+        TypedArray a =
+            context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.AccelerateInterpolator);
+        
+        mFactor = a.getFloat(com.android.internal.R.styleable.AccelerateInterpolator_factor, 1.0f);
+        
+        a.recycle();
+    }
+    
+    public float getInterpolation(float input) {
+        if (mFactor == 1.0f) {
+            return (float)(input * input);
+        } else {
+            return (float)Math.pow(input, 2 * mFactor);
+        }
+    }
+    
+    private float mFactor = 1.0f;
+}