diff --git a/core/res/res/values/attrs.xml b/core/res/res/values/attrs.xml
index 438d1fb04cbb1..0e597d0c1a70b 100644
--- a/core/res/res/values/attrs.xml
+++ b/core/res/res/values/attrs.xml
@@ -5271,11 +5271,16 @@
         <attr name="viewportWidth" format="float"/>
         <!-- The height of the canvas the drawing is on. -->
         <attr name="viewportHeight" format="float"/>
+        <!-- The name of this vector drawable -->
+        <attr name="name" />
+        <!-- The opacity of the whole vector drawable, as a value between 0
+             (completely transparent) and 1 (completely opaque). -->
+        <attr name="alpha" />
     </declare-styleable>
 
     <!-- Defines the group used in VectorDrawables. -->
     <declare-styleable name="VectorDrawableGroup">
-        <!-- The Name of this group -->
+        <!-- The name of this group -->
         <attr name="name" />
         <!-- The amount to rotate the group -->
         <attr name="rotation" />
@@ -5295,7 +5300,7 @@
 
     <!-- Defines the path used in VectorDrawables. -->
     <declare-styleable name="VectorDrawablePath">
-        <!-- The Name of this path -->
+        <!-- The name of this path -->
         <attr name="name" />
         <!-- The width a path stroke -->
         <attr name="strokeWidth" format="float" />
diff --git a/graphics/java/android/graphics/drawable/VectorDrawable.java b/graphics/java/android/graphics/drawable/VectorDrawable.java
index 4407a3cfd98cc..5fd8c793a78e9 100644
--- a/graphics/java/android/graphics/drawable/VectorDrawable.java
+++ b/graphics/java/android/graphics/drawable/VectorDrawable.java
@@ -256,21 +256,22 @@ public class VectorDrawable extends Drawable {
         }
 
         if (!mAllowCaching) {
-            mVectorState.mVPathRenderer.draw(canvas, bounds.width(), bounds.height());
+            // AnimatedVectorDrawable
+            if (!mVectorState.hasTranslucentRoot()) {
+                mVectorState.mVPathRenderer.draw(canvas, bounds.width(), bounds.height());
+            } else {
+                mVectorState.createCachedBitmapIfNeeded(bounds);
+                mVectorState.updateCachedBitmap(bounds);
+                mVectorState.drawCachedBitmapWithRootAlpha(canvas);
+            }
         } else {
-            Bitmap bitmap = mVectorState.mCachedBitmap;
-            if (bitmap == null || !mVectorState.canReuseCache(bounds.width(),
-                    bounds.height())) {
-                bitmap = Bitmap.createBitmap(bounds.width(), bounds.height(),
-                        Bitmap.Config.ARGB_8888);
-                Canvas tmpCanvas = new Canvas(bitmap);
-                mVectorState.mVPathRenderer.draw(tmpCanvas, bounds.width(), bounds.height());
-                mVectorState.mCachedBitmap = bitmap;
-
+            // Static Vector Drawable case.
+            mVectorState.createCachedBitmapIfNeeded(bounds);
+            if (!mVectorState.canReuseCache()) {
+                mVectorState.updateCachedBitmap(bounds);
                 mVectorState.updateCacheStates();
             }
-            // The bitmap's size is the same as the bounds.
-            canvas.drawBitmap(bitmap, 0, 0, null);
+            mVectorState.drawCachedBitmapWithRootAlpha(canvas);
         }
 
         canvas.restoreToCount(saveCount);
@@ -492,6 +493,15 @@ public class VectorDrawable extends Drawable {
             throw new XmlPullParserException(a.getPositionDescription() +
                     "<vector> tag requires height > 0");
         }
+
+        final float alphaInFloat = a.getFloat(R.styleable.VectorDrawable_alpha,
+                pathRenderer.getAlpha());
+        pathRenderer.setAlpha(alphaInFloat);
+
+        pathRenderer.mRootName = a.getString(R.styleable.VectorDrawable_name);
+        if (pathRenderer.mRootName != null) {
+            pathRenderer.mVGTargetsMap.put(pathRenderer.mRootName, pathRenderer);
+        }
     }
 
     private void inflateInternal(Resources res, XmlPullParser parser, AttributeSet attrs,
@@ -646,15 +656,60 @@ public class VectorDrawable extends Drawable {
             }
         }
 
-        public boolean canReuseCache(int width, int height) {
+        // TODO: Support colorFilter here.
+        public void drawCachedBitmapWithRootAlpha(Canvas canvas) {
+            Paint alphaPaint = getRootAlphaPaint();
+            // The bitmap's size is the same as the bounds.
+            canvas.drawBitmap(mCachedBitmap, 0, 0, alphaPaint);
+        }
+
+        public boolean hasTranslucentRoot() {
+            return mVPathRenderer.getRootAlpha() < 255;
+        }
+
+        /**
+         * @return null when there is no need for alpha paint.
+         */
+        public Paint getRootAlphaPaint() {
+            Paint paint = null;
+            boolean needsAlphaPaint = hasTranslucentRoot();
+            if (needsAlphaPaint) {
+                paint = new Paint();
+                paint.setAlpha(mVPathRenderer.getRootAlpha());
+            }
+            return paint;
+        }
+
+        public void updateCachedBitmap(Rect bounds) {
+            mCachedBitmap.eraseColor(Color.TRANSPARENT);
+            Canvas tmpCanvas = new Canvas(mCachedBitmap);
+            mVPathRenderer.draw(tmpCanvas, bounds.width(), bounds.height());
+        }
+
+        public void createCachedBitmapIfNeeded(Rect bounds) {
+            if (mCachedBitmap == null || !canReuseBitmap(bounds.width(),
+                    bounds.height())) {
+                mCachedBitmap = Bitmap.createBitmap(bounds.width(), bounds.height(),
+                        Bitmap.Config.ARGB_8888);
+            }
+
+        }
+
+        public boolean canReuseBitmap(int width, int height) {
+            if (width == mCachedBitmap.getWidth()
+                    && height == mCachedBitmap.getHeight()) {
+                return true;
+            }
+            return false;
+        }
+
+        public boolean canReuseCache() {
             if (!mCacheDirty
                     && mCachedThemeAttrs == mThemeAttrs
                     && mCachedTint == mTint
                     && mCachedTintMode == mTintMode
                     && mCachedAutoMirrored == mAutoMirrored
-                    && width == mCachedBitmap.getWidth()
-                    && height == mCachedBitmap.getHeight()
-                    && mCachedRootAlpha == mVPathRenderer.getRootAlpha())  {
+                    && mCachedRootAlpha == mVPathRenderer.getRootAlpha()) {
                 return true;
             }
             return false;
@@ -729,7 +784,8 @@ public class VectorDrawable extends Drawable {
         float mBaseHeight = 0;
         float mViewportWidth = 0;
         float mViewportHeight = 0;
-        private int mRootAlpha = 0xFF;
+        int mRootAlpha = 0xFF;
+        String mRootName = null;
 
         final ArrayMap<String, Object> mVGTargetsMap = new ArrayMap<String, Object>();
 
@@ -747,6 +803,17 @@ public class VectorDrawable extends Drawable {
             return mRootAlpha;
         }
 
+        // setAlpha() and getAlpha() are used mostly for animation purpose, since
+        // Animator like to use alpha from 0 to 1.
+        public void setAlpha(float alpha) {
+            setRootAlpha((int) (alpha * 255));
+        }
+
+        @SuppressWarnings("unused")
+        public float getAlpha() {
+            return getRootAlpha() / 255.0f;
+        }
+
         public VPathRenderer(VPathRenderer copy) {
             mRootGroup = new VGroup(copy.mRootGroup, mVGTargetsMap);
             mPath = new Path(copy.mPath);
@@ -757,6 +824,10 @@ public class VectorDrawable extends Drawable {
             mViewportHeight = copy.mViewportHeight;
             mChangingConfigurations = copy.mChangingConfigurations;
             mRootAlpha = copy.mRootAlpha;
+            mRootName = copy.mRootName;
+            if (copy.mRootName != null) {
+                mVGTargetsMap.put(copy.mRootName, this);
+            }
         }
 
         public boolean canApplyTheme() {
@@ -856,7 +927,7 @@ public class VectorDrawable extends Drawable {
         }
 
         private void drawPath(VGroup vGroup, VPath vPath, Canvas canvas, int w, int h) {
-            final float scaleX =  w / mViewportWidth;
+            final float scaleX = w / mViewportWidth;
             final float scaleY = h / mViewportHeight;
             final float minScale = Math.min(scaleX, scaleY);
 
@@ -1219,7 +1290,7 @@ public class VectorDrawable extends Drawable {
     /**
      * Clip path, which only has name and pathData.
      */
-    private static class VClipPath extends VPath{
+    private static class VClipPath extends VPath {
         public VClipPath() {
             // Empty constructor.
         }
diff --git a/tests/VectorDrawableTest/res/anim/trim_path_animation06.xml b/tests/VectorDrawableTest/res/anim/trim_path_animation06.xml
new file mode 100644
index 0000000000000..1a81866669bc8
--- /dev/null
+++ b/tests/VectorDrawableTest/res/anim/trim_path_animation06.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+ 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.
+-->
+
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <objectAnimator
+        android:duration="9000"
+        android:propertyName="alpha"
+        android:valueFrom="1.0"
+        android:valueTo="0.0"/>
+
+</set>
\ No newline at end of file
diff --git a/tests/VectorDrawableTest/res/drawable/animation_vector_drawable01.xml b/tests/VectorDrawableTest/res/drawable/animation_vector_drawable01.xml
index 19b82adcc143d..8b0ceda4939f5 100644
--- a/tests/VectorDrawableTest/res/drawable/animation_vector_drawable01.xml
+++ b/tests/VectorDrawableTest/res/drawable/animation_vector_drawable01.xml
@@ -37,5 +37,8 @@
     <target
         android:name="rotationGroup"
         android:animation="@anim/trim_path_animation04" />
+    <target
+        android:name="rootGroup"
+        android:animation="@anim/trim_path_animation06" />
 
 </animated-vector>
\ No newline at end of file
diff --git a/tests/VectorDrawableTest/res/drawable/vector_drawable12.xml b/tests/VectorDrawableTest/res/drawable/vector_drawable12.xml
index 2c8b75118dfe9..69ae62c19aba7 100644
--- a/tests/VectorDrawableTest/res/drawable/vector_drawable12.xml
+++ b/tests/VectorDrawableTest/res/drawable/vector_drawable12.xml
@@ -14,10 +14,12 @@
      limitations under the License.
 -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:name="rootGroup"
         android:height="64dp"
         android:width="64dp"
         android:viewportHeight="600"
-        android:viewportWidth="600" >
+        android:viewportWidth="600"
+        android:alpha="0.5" >
 
     <group
         android:name="rotationGroup"
diff --git a/tests/VectorDrawableTest/src/com/android/test/dynamic/AnimatedVectorDrawableTest.java b/tests/VectorDrawableTest/src/com/android/test/dynamic/AnimatedVectorDrawableTest.java
index f165cde79bc5f..05bf166a98ce3 100644
--- a/tests/VectorDrawableTest/src/com/android/test/dynamic/AnimatedVectorDrawableTest.java
+++ b/tests/VectorDrawableTest/src/com/android/test/dynamic/AnimatedVectorDrawableTest.java
@@ -31,6 +31,8 @@ public class AnimatedVectorDrawableTest extends Activity implements View.OnClick
             R.drawable.animation_vector_progress_bar,
             R.drawable.animation_vector_drawable_favorite,
             R.drawable.animation_vector_drawable01,
+            // Duplicate to test constant state.
+            R.drawable.animation_vector_drawable01,
     };
 
     @Override