Merge "Add transition support to PopupWindow"
diff --git a/api/current.txt b/api/current.txt
index dd2549d..47fa5d1 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -38453,6 +38453,8 @@
     method public void setClippingEnabled(boolean);
     method public void setContentView(android.view.View);
     method public void setElevation(float);
+    method public void setEnterTransition(android.transition.Transition);
+    method public void setExitTransition(android.transition.Transition);
     method public void setFocusable(boolean);
     method public void setHeight(int);
     method public void setIgnoreCheekPress();
diff --git a/api/system-current.txt b/api/system-current.txt
index 8d503d6..4eb00f4 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -40948,6 +40948,8 @@
     method public void setClippingEnabled(boolean);
     method public void setContentView(android.view.View);
     method public void setElevation(float);
+    method public void setEnterTransition(android.transition.Transition);
+    method public void setExitTransition(android.transition.Transition);
     method public void setFocusable(boolean);
     method public void setHeight(int);
     method public void setIgnoreCheekPress();
diff --git a/core/java/android/view/View.java b/core/java/android/view/View.java
index 259367e..19c9271 100644
--- a/core/java/android/view/View.java
+++ b/core/java/android/view/View.java
@@ -14885,10 +14885,9 @@
     void setDisplayListProperties(RenderNode renderNode) {
         if (renderNode != null) {
             renderNode.setHasOverlappingRendering(hasOverlappingRendering());
-            if (mParent instanceof ViewGroup) {
-                renderNode.setClipToBounds(
-                        (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0);
-            }
+            renderNode.setClipToBounds(mParent instanceof ViewGroup
+                    && ((ViewGroup) mParent).getClipChildren());
+
             float alpha = 1;
             if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags &
                     ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) {
diff --git a/core/java/android/view/ViewRootImpl.java b/core/java/android/view/ViewRootImpl.java
index 151ff83..15e7060 100644
--- a/core/java/android/view/ViewRootImpl.java
+++ b/core/java/android/view/ViewRootImpl.java
@@ -472,8 +472,10 @@
 
                 // Compute surface insets required to draw at specified Z value.
                 // TODO: Use real shadow insets for a constant max Z.
-                final int surfaceInset = (int) Math.ceil(view.getZ() * 2);
-                attrs.surfaceInsets.set(surfaceInset, surfaceInset, surfaceInset, surfaceInset);
+                if (!attrs.hasManualSurfaceInsets) {
+                    final int surfaceInset = (int) Math.ceil(view.getZ() * 2);
+                    attrs.surfaceInsets.set(surfaceInset, surfaceInset, surfaceInset, surfaceInset);
+                }
 
                 CompatibilityInfo compatibilityInfo = mDisplayAdjustments.getCompatibilityInfo();
                 mTranslator = compatibilityInfo.getTranslator();
@@ -760,6 +762,7 @@
             final int oldInsetRight = mWindowAttributes.surfaceInsets.right;
             final int oldInsetBottom = mWindowAttributes.surfaceInsets.bottom;
             final int oldSoftInputMode = mWindowAttributes.softInputMode;
+            final boolean oldHasManualSurfaceInsets = mWindowAttributes.hasManualSurfaceInsets;
 
             // Keep track of the actual window flags supplied by the client.
             mClientWindowLayoutFlags = attrs.flags;
@@ -786,6 +789,7 @@
             // Restore old surface insets.
             mWindowAttributes.surfaceInsets.set(
                     oldInsetLeft, oldInsetTop, oldInsetRight, oldInsetBottom);
+            mWindowAttributes.hasManualSurfaceInsets = oldHasManualSurfaceInsets;
 
             applyKeepScreenOnFlag(mWindowAttributes);
 
diff --git a/core/java/android/view/WindowManager.java b/core/java/android/view/WindowManager.java
index 12b310f..740cb5d 100644
--- a/core/java/android/view/WindowManager.java
+++ b/core/java/android/view/WindowManager.java
@@ -1325,6 +1325,16 @@
          * @hide
          */
         public final Rect surfaceInsets = new Rect();
+
+        /**
+         * Whether the surface insets have been manually set. When set to
+         * {@code false}, the view root will automatically determine the
+         * appropriate surface insets.
+         *
+         * @see #surfaceInsets
+         * @hide
+         */
+        public boolean hasManualSurfaceInsets;
     
         /**
          * The desired bitmap format.  May be one of the constants in
@@ -1621,6 +1631,7 @@
             out.writeInt(surfaceInsets.top);
             out.writeInt(surfaceInsets.right);
             out.writeInt(surfaceInsets.bottom);
+            out.writeInt(hasManualSurfaceInsets ? 1 : 0);
             out.writeInt(needsMenuKey);
         }
 
@@ -1669,6 +1680,7 @@
             surfaceInsets.top = in.readInt();
             surfaceInsets.right = in.readInt();
             surfaceInsets.bottom = in.readInt();
+            hasManualSurfaceInsets = in.readInt() != 0;
             needsMenuKey = in.readInt();
         }
 
@@ -1851,6 +1863,11 @@
                 changes |= SURFACE_INSETS_CHANGED;
             }
 
+            if (hasManualSurfaceInsets != o.hasManualSurfaceInsets) {
+                hasManualSurfaceInsets = o.hasManualSurfaceInsets;
+                changes |= SURFACE_INSETS_CHANGED;
+            }
+
             if (needsMenuKey != o.needsMenuKey) {
                 needsMenuKey = o.needsMenuKey;
                 changes |= NEEDS_MENU_KEY_CHANGED;
@@ -1959,8 +1976,11 @@
             if (userActivityTimeout >= 0) {
                 sb.append(" userActivityTimeout=").append(userActivityTimeout);
             }
-            if (!surfaceInsets.equals(Insets.NONE)) {
+            if (!surfaceInsets.equals(Insets.NONE) || hasManualSurfaceInsets) {
                 sb.append(" surfaceInsets=").append(surfaceInsets);
+                if (hasManualSurfaceInsets) {
+                    sb.append(" (manual)");
+                }
             }
             if (needsMenuKey != NEEDS_MENU_UNSET) {
                 sb.append(" needsMenuKey=");
diff --git a/core/java/android/widget/PopupWindow.java b/core/java/android/widget/PopupWindow.java
index f5cd915..7cf3eed 100644
--- a/core/java/android/widget/PopupWindow.java
+++ b/core/java/android/widget/PopupWindow.java
@@ -27,6 +27,11 @@
 import android.graphics.drawable.StateListDrawable;
 import android.os.Build;
 import android.os.IBinder;
+import android.transition.Transition;
+import android.transition.Transition.EpicenterCallback;
+import android.transition.TransitionInflater;
+import android.transition.TransitionManager;
+import android.transition.TransitionSet;
 import android.util.AttributeSet;
 import android.view.Gravity;
 import android.view.KeyEvent;
@@ -39,12 +44,13 @@
 import android.view.WindowManager;
 
 import java.lang.ref.WeakReference;
+import java.util.List;
 
 /**
  * <p>A popup window that can be used to display an arbitrary view. The popup
  * window is a floating container that appears on top of the current
  * activity.</p>
- * 
+ *
  * @see android.widget.AutoCompleteTextView
  * @see android.widget.Spinner
  */
@@ -56,7 +62,7 @@
      * it doesn't.
      */
     public static final int INPUT_METHOD_FROM_FOCUSABLE = 0;
-    
+
     /**
      * Mode for {@link #setInputMethodMode(int)}: this popup always needs to
      * work with an input method, regardless of whether it is focusable.  This
@@ -64,7 +70,7 @@
      * the input method while it is shown.
      */
     public static final int INPUT_METHOD_NEEDED = 1;
-    
+
     /**
      * Mode for {@link #setInputMethodMode(int)}: this popup never needs to
      * work with an input method, regardless of whether it is focusable.  This
@@ -75,14 +81,32 @@
 
     private static final int DEFAULT_ANCHORED_GRAVITY = Gravity.TOP | Gravity.START;
 
+    /**
+     * Default animation style indicating that separate animations should be
+     * used for top/bottom anchoring states.
+     */
+    private static final int ANIMATION_STYLE_DEFAULT = -1;
+
+    private final int[] mDrawingLocation = new int[2];
+    private final int[] mScreenLocation = new int[2];
+    private final Rect mTempRect = new Rect();
+    private final Rect mAnchorBounds = new Rect();
+
     private Context mContext;
     private WindowManager mWindowManager;
-    
+
     private boolean mIsShowing;
     private boolean mIsDropdown;
 
+    /** View that handles event dispatch and content transitions. */
+    private PopupDecorView mDecorView;
+
+    /** View that holds the popup background. May be the content view. */
+    private View mBackgroundView;
+
+    /** The contents of the popup. */
     private View mContentView;
-    private View mPopupView;
+
     private boolean mFocusable;
     private int mInputMethodMode = INPUT_METHOD_FROM_FOCUSABLE;
     private int mSoftInputMode = WindowManager.LayoutParams.SOFT_INPUT_STATE_UNCHANGED;
@@ -112,49 +136,52 @@
 
     private float mElevation;
 
-    private int[] mDrawingLocation = new int[2];
-    private int[] mScreenLocation = new int[2];
-    private Rect mTempRect = new Rect();
-    
     private Drawable mBackground;
     private Drawable mAboveAnchorBackgroundDrawable;
     private Drawable mBelowAnchorBackgroundDrawable;
 
-    // Temporary animation centers. Should be moved into window params?
-    private int mAnchorRelativeX;
-    private int mAnchorRelativeY;
+    private Transition mEnterTransition;
+    private Transition mExitTransition;
 
     private boolean mAboveAnchor;
     private int mWindowLayoutType = WindowManager.LayoutParams.TYPE_APPLICATION_PANEL;
-    
+
     private OnDismissListener mOnDismissListener;
     private boolean mIgnoreCheekPress = false;
 
-    private int mAnimationStyle = -1;
-    
+    private int mAnimationStyle = ANIMATION_STYLE_DEFAULT;
+
     private static final int[] ABOVE_ANCHOR_STATE_SET = new int[] {
         com.android.internal.R.attr.state_above_anchor
     };
 
     private WeakReference<View> mAnchor;
 
-    private final OnScrollChangedListener mOnScrollChangedListener =
-        new OnScrollChangedListener() {
-            @Override
-            public void onScrollChanged() {
-                final View anchor = mAnchor != null ? mAnchor.get() : null;
-                if (anchor != null && mPopupView != null) {
-                    final WindowManager.LayoutParams p = (WindowManager.LayoutParams)
-                            mPopupView.getLayoutParams();
+    private final EpicenterCallback mEpicenterCallback = new EpicenterCallback() {
+        @Override
+        public Rect onGetEpicenter(Transition transition) {
+            return mAnchorBounds;
+        }
+    };
 
-                    updateAboveAnchor(findDropDownPosition(anchor, p, mAnchorXoff, mAnchorYoff,
-                            mAnchoredGravity));
-                    update(p.x, p.y, -1, -1, true);
-                }
+    private final OnScrollChangedListener mOnScrollChangedListener = new OnScrollChangedListener() {
+        @Override
+        public void onScrollChanged() {
+            final View anchor = mAnchor != null ? mAnchor.get() : null;
+            if (anchor != null && mDecorView != null) {
+                final WindowManager.LayoutParams p = (WindowManager.LayoutParams)
+                        mDecorView.getLayoutParams();
+
+                updateAboveAnchor(findDropDownPosition(anchor, p, mAnchorXoff, mAnchorYoff,
+                        mAnchoredGravity));
+                update(p.x, p.y, -1, -1, true);
             }
-        };
+        }
+    };
 
-    private int mAnchorXoff, mAnchorYoff, mAnchoredGravity;
+    private int mAnchorXoff;
+    private int mAnchorYoff;
+    private int mAnchoredGravity;
     private boolean mOverlapAnchor;
 
     private boolean mPopupViewInitialLayoutDirectionInherited;
@@ -185,10 +212,10 @@
     public PopupWindow(Context context, AttributeSet attrs, int defStyleAttr) {
         this(context, attrs, defStyleAttr, 0);
     }
-    
+
     /**
      * <p>Create a new, empty, non focusable popup window of dimension (0,0).</p>
-     * 
+     *
      * <p>The popup does not provide a background.</p>
      */
     public PopupWindow(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
@@ -201,11 +228,34 @@
         mElevation = a.getDimension(R.styleable.PopupWindow_popupElevation, 0);
         mOverlapAnchor = a.getBoolean(R.styleable.PopupWindow_overlapAnchor, false);
 
-        final int animStyle = a.getResourceId(R.styleable.PopupWindow_popupAnimationStyle, -1);
-        mAnimationStyle = animStyle == R.style.Animation_PopupWindow ? -1 : animStyle;
+        // Preserve default behavior from Gingerbread. If the animation is
+        // undefined or explicitly specifies the Gingerbread animation style,
+        // use a sentinel value.
+        if (a.hasValueOrEmpty(R.styleable.PopupWindow_popupAnimationStyle)) {
+            final int animStyle = a.getResourceId(R.styleable.PopupWindow_popupAnimationStyle, 0);
+            if (animStyle == R.style.Animation_PopupWindow) {
+                mAnimationStyle = ANIMATION_STYLE_DEFAULT;
+            } else {
+                mAnimationStyle = animStyle;
+            }
+        } else {
+            mAnimationStyle = ANIMATION_STYLE_DEFAULT;
+        }
+
+        final Transition enterTransition = getTransition(a.getResourceId(
+                R.styleable.PopupWindow_popupEnterTransition, 0));
+        final Transition exitTransition;
+        if (a.hasValueOrEmpty(R.styleable.PopupWindow_popupExitTransition)) {
+            exitTransition = getTransition(a.getResourceId(
+                    R.styleable.PopupWindow_popupExitTransition, 0));
+        } else {
+            exitTransition = enterTransition == null ? null : enterTransition.clone();
+        }
 
         a.recycle();
 
+        setEnterTransition(enterTransition);
+        setExitTransition(exitTransition);
         setBackgroundDrawable(bg);
     }
 
@@ -286,6 +336,37 @@
         setFocusable(focusable);
     }
 
+    public void setEnterTransition(Transition enterTransition) {
+        mEnterTransition = enterTransition;
+
+        if (mEnterTransition != null) {
+            mEnterTransition.setEpicenterCallback(mEpicenterCallback);
+        }
+    }
+
+    public void setExitTransition(Transition exitTransition) {
+        mExitTransition = exitTransition;
+
+        if (mExitTransition != null) {
+            mExitTransition.setEpicenterCallback(mEpicenterCallback);
+        }
+    }
+
+    private Transition getTransition(int resId) {
+        if (resId != 0 && resId != R.transition.no_transition) {
+            final TransitionInflater inflater = TransitionInflater.from(mContext);
+            final Transition transition = inflater.inflateTransition(resId);
+            if (transition != null) {
+                final boolean isEmpty = transition instanceof TransitionSet
+                        && ((TransitionSet) transition).getTransitionCount() == 0;
+                if (!isEmpty) {
+                    return transition;
+                }
+            }
+        }
+        return null;
+    }
+
     /**
      * Return the drawable used as the popup window's background.
      *
@@ -379,7 +460,7 @@
      * Set the flag on popup to ignore cheek press events; by default this flag
      * is set to false
      * which means the popup will not ignore cheek press dispatch events.
-     * 
+     *
      * <p>If the popup is showing, calling this method will take effect only
      * the next time the popup is shown or through a manual call to one of
      * the {@link #update()} methods.</p>
@@ -389,7 +470,7 @@
     public void setIgnoreCheekPress() {
         mIgnoreCheekPress = true;
     }
-    
+
 
     /**
      * <p>Change the animation style resource for this popup.</p>
@@ -401,13 +482,13 @@
      * @param animationStyle animation style to use when the popup appears
      *      and disappears.  Set to -1 for the default animation, 0 for no
      *      animation, or a resource identifier for an explicit animation.
-     *      
+     *
      * @see #update()
      */
     public void setAnimationStyle(int animationStyle) {
         mAnimationStyle = animationStyle;
     }
-    
+
     /**
      * <p>Return the view used as the content of the popup window.</p>
      *
@@ -491,7 +572,7 @@
      * @param focusable true if the popup should grab focus, false otherwise.
      *
      * @see #isFocusable()
-     * @see #isShowing() 
+     * @see #isShowing()
      * @see #update()
      */
     public void setFocusable(boolean focusable) {
@@ -500,23 +581,23 @@
 
     /**
      * Return the current value in {@link #setInputMethodMode(int)}.
-     * 
+     *
      * @see #setInputMethodMode(int)
      */
     public int getInputMethodMode() {
         return mInputMethodMode;
-        
+
     }
-    
+
     /**
      * Control how the popup operates with an input method: one of
      * {@link #INPUT_METHOD_FROM_FOCUSABLE}, {@link #INPUT_METHOD_NEEDED},
      * or {@link #INPUT_METHOD_NOT_NEEDED}.
-     * 
+     *
      * <p>If the popup is showing, calling this method will take effect only
      * the next time the popup is shown or through a manual call to one of
      * the {@link #update()} methods.</p>
-     * 
+     *
      * @see #getInputMethodMode()
      * @see #update()
      */
@@ -547,12 +628,12 @@
     public int getSoftInputMode() {
         return mSoftInputMode;
     }
-    
+
     /**
      * <p>Indicates whether the popup window receives touch events.</p>
-     * 
+     *
      * @return true if the popup is touchable, false otherwise
-     * 
+     *
      * @see #setTouchable(boolean)
      */
     public boolean isTouchable() {
@@ -571,7 +652,7 @@
      * @param touchable true if the popup should receive touch events, false otherwise
      *
      * @see #isTouchable()
-     * @see #isShowing() 
+     * @see #isShowing()
      * @see #update()
      */
     public void setTouchable(boolean touchable) {
@@ -581,9 +662,9 @@
     /**
      * <p>Indicates whether the popup window will be informed of touch events
      * outside of its window.</p>
-     * 
+     *
      * @return true if the popup is outside touchable, false otherwise
-     * 
+     *
      * @see #setOutsideTouchable(boolean)
      */
     public boolean isOutsideTouchable() {
@@ -604,7 +685,7 @@
      * touch events, false otherwise
      *
      * @see #isOutsideTouchable()
-     * @see #isShowing() 
+     * @see #isShowing()
      * @see #update()
      */
     public void setOutsideTouchable(boolean touchable) {
@@ -613,9 +694,9 @@
 
     /**
      * <p>Indicates whether clipping of the popup window is enabled.</p>
-     * 
+     *
      * @return true if the clipping is enabled, false otherwise
-     * 
+     *
      * @see #setClippingEnabled(boolean)
      */
     public boolean isClippingEnabled() {
@@ -626,13 +707,13 @@
      * <p>Allows the popup window to extend beyond the bounds of the screen. By default the
      * window is clipped to the screen boundaries. Setting this to false will allow windows to be
      * accurately positioned.</p>
-     * 
+     *
      * <p>If the popup is showing, calling this method will take effect only
      * the next time the popup is shown or through a manual call to one of
      * the {@link #update()} methods.</p>
      *
      * @param enabled false if the window should be allowed to extend outside of the screen
-     * @see #isShowing() 
+     * @see #isShowing()
      * @see #isClippingEnabled()
      * @see #update()
      */
@@ -660,12 +741,12 @@
     void setAllowScrollingAnchorParent(boolean enabled) {
         mAllowScrollingAnchorParent = enabled;
     }
-    
+
     /**
      * <p>Indicates whether the popup window supports splitting touches.</p>
-     * 
+     *
      * @return true if the touch splitting is enabled, false otherwise
-     * 
+     *
      * @see #setSplitTouchEnabled(boolean)
      */
     public boolean isSplitTouchEnabled() {
@@ -794,7 +875,7 @@
      * window manager by the popup.  By default these are 0, meaning that
      * the current width or height is requested as an explicit size from
      * the window manager.  You can supply
-     * {@link ViewGroup.LayoutParams#WRAP_CONTENT} or 
+     * {@link ViewGroup.LayoutParams#WRAP_CONTENT} or
      * {@link ViewGroup.LayoutParams#MATCH_PARENT} to have that measure
      * spec supplied instead, replacing the absolute width and height that
      * has been set in the popup.</p>
@@ -815,7 +896,7 @@
         mWidthMode = widthSpec;
         mHeightMode = heightSpec;
     }
-    
+
     /**
      * <p>Return this popup's height MeasureSpec</p>
      *
@@ -836,7 +917,7 @@
      * @param height the height MeasureSpec of the popup
      *
      * @see #getHeight()
-     * @see #isShowing() 
+     * @see #isShowing()
      */
     public void setHeight(int height) {
         mHeight = height;
@@ -847,7 +928,7 @@
      *
      * @return the width MeasureSpec of the popup
      *
-     * @see #setWidth(int) 
+     * @see #setWidth(int)
      */
     public int getWidth() {
         return mWidth;
@@ -913,7 +994,7 @@
      * a gravity of {@link android.view.Gravity#NO_GRAVITY} is similar to specifying
      * <code>Gravity.LEFT | Gravity.TOP</code>.
      * </p>
-     * 
+     *
      * @param parent a parent view to get the {@link android.view.View#getWindowToken()} token from
      * @param gravity the gravity which controls the placement of the popup window
      * @param x the popup's x location offset
@@ -946,7 +1027,7 @@
 
         WindowManager.LayoutParams p = createPopupLayout(token);
         p.windowAnimations = computeAnimationResource();
-       
+
         preparePopup(p);
         if (gravity == Gravity.NO_GRAVITY) {
             gravity = Gravity.TOP | Gravity.START;
@@ -1049,12 +1130,12 @@
                 // do the job.
                 if (mAboveAnchorBackgroundDrawable != null) {
                     if (mAboveAnchor) {
-                        mPopupView.setBackground(mAboveAnchorBackgroundDrawable);
+                        mDecorView.setBackground(mAboveAnchorBackgroundDrawable);
                     } else {
-                        mPopupView.setBackground(mBelowAnchorBackgroundDrawable);
+                        mDecorView.setBackground(mBelowAnchorBackgroundDrawable);
                     }
                 } else {
-                    mPopupView.refreshDrawableState();
+                    mDecorView.refreshDrawableState();
                 }
             }
         }
@@ -1089,36 +1170,79 @@
                     + "calling setContentView() before attempting to show the popup.");
         }
 
+        // When a background is available, we embed the content view within
+        // another view that owns the background drawable.
         if (mBackground != null) {
-            final ViewGroup.LayoutParams layoutParams = mContentView.getLayoutParams();
-            int height = ViewGroup.LayoutParams.MATCH_PARENT;
-            if (layoutParams != null &&
-                    layoutParams.height == ViewGroup.LayoutParams.WRAP_CONTENT) {
-                height = ViewGroup.LayoutParams.WRAP_CONTENT;
-            }
-
-            // when a background is available, we embed the content view
-            // within another view that owns the background drawable
-            PopupViewContainer popupViewContainer = new PopupViewContainer(mContext);
-            PopupViewContainer.LayoutParams listParams = new PopupViewContainer.LayoutParams(
-                    ViewGroup.LayoutParams.MATCH_PARENT, height
-            );
-            popupViewContainer.setBackground(mBackground);
-            popupViewContainer.addView(mContentView, listParams);
-
-            mPopupView = popupViewContainer;
+            mBackgroundView = createBackgroundView(mContentView);
+            mBackgroundView.setBackground(mBackground);
         } else {
-            mPopupView = mContentView;
+            mBackgroundView = mContentView;
         }
 
-        mPopupView.setElevation(mElevation);
+        mDecorView = createDecorView(mBackgroundView);
+
+        // The background owner should be elevated so that it casts a shadow.
+        mBackgroundView.setElevation(mElevation);
+
+        // We may wrap that in another view, so we'll need to manually specify
+        // the surface insets.
+        final int surfaceInset = (int) Math.ceil(mBackgroundView.getZ() * 2);
+        p.surfaceInsets.set(surfaceInset, surfaceInset, surfaceInset, surfaceInset);
+        p.hasManualSurfaceInsets = true;
+
         mPopupViewInitialLayoutDirectionInherited =
-                (mPopupView.getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT);
+                (mContentView.getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT);
         mPopupWidth = p.width;
         mPopupHeight = p.height;
     }
 
     /**
+     * Wraps a content view in a PopupViewContainer.
+     *
+     * @param contentView the content view to wrap
+     * @return a PopupViewContainer that wraps the content view
+     */
+    private PopupBackgroundView createBackgroundView(View contentView) {
+        final ViewGroup.LayoutParams layoutParams = mContentView.getLayoutParams();
+        final int height;
+        if (layoutParams != null && layoutParams.height == ViewGroup.LayoutParams.WRAP_CONTENT) {
+            height = ViewGroup.LayoutParams.WRAP_CONTENT;
+        } else {
+            height = ViewGroup.LayoutParams.MATCH_PARENT;
+        }
+
+        final PopupBackgroundView backgroundView = new PopupBackgroundView(mContext);
+        final PopupBackgroundView.LayoutParams listParams = new PopupBackgroundView.LayoutParams(
+                ViewGroup.LayoutParams.MATCH_PARENT, height);
+        backgroundView.addView(contentView, listParams);
+
+        return backgroundView;
+    }
+
+    /**
+     * Wraps a content view in a FrameLayout.
+     *
+     * @param contentView the content view to wrap
+     * @return a FrameLayout that wraps the content view
+     */
+    private PopupDecorView createDecorView(View contentView) {
+        final ViewGroup.LayoutParams layoutParams = mContentView.getLayoutParams();
+        final int height;
+        if (layoutParams != null && layoutParams.height == ViewGroup.LayoutParams.WRAP_CONTENT) {
+            height = ViewGroup.LayoutParams.WRAP_CONTENT;
+        } else {
+            height = ViewGroup.LayoutParams.MATCH_PARENT;
+        }
+
+        final PopupDecorView decorView = new PopupDecorView(mContext);
+        decorView.addView(contentView, ViewGroup.LayoutParams.MATCH_PARENT, height);
+        decorView.setClipChildren(false);
+        decorView.setClipToPadding(false);
+
+        return decorView;
+    }
+
+    /**
      * <p>Invoke the popup window by adding the content view to the window
      * manager.</p>
      *
@@ -1130,16 +1254,34 @@
         if (mContext != null) {
             p.packageName = mContext.getPackageName();
         }
-        mPopupView.setFitsSystemWindows(mLayoutInsetDecor);
+
+        final View rootView = mContentView.getRootView();
+        rootView.setFitsSystemWindows(mLayoutInsetDecor);
         setLayoutDirectionFromAnchor();
-        mWindowManager.addView(mPopupView, p);
+
+        mWindowManager.addView(rootView, p);
+
+        // Postpone enter transition until the scene root has been laid out.
+        if (mEnterTransition != null) {
+            mEnterTransition.addTarget(mBackgroundView);
+            mEnterTransition.addListener(new Transition.TransitionListenerAdapter() {
+                @Override
+                public void onTransitionEnd(Transition transition) {
+                    transition.removeListener(this);
+                    transition.removeTarget(mBackgroundView);
+                }
+            });
+
+            mDecorView.getViewTreeObserver().addOnGlobalLayoutListener(
+                    new PostLayoutTransitionListener(mDecorView, mEnterTransition));
+        }
     }
 
     private void setLayoutDirectionFromAnchor() {
         if (mAnchor != null) {
             View anchor = mAnchor.get();
             if (anchor != null && mPopupViewInitialLayoutDirectionInherited) {
-                mPopupView.setLayoutDirection(anchor.getLayoutDirection());
+                mDecorView.setLayoutDirection(anchor.getLayoutDirection());
             }
         }
     }
@@ -1224,7 +1366,7 @@
     }
 
     private int computeAnimationResource() {
-        if (mAnimationStyle == -1) {
+        if (mAnimationStyle == ANIMATION_STYLE_DEFAULT) {
             if (mIsDropdown) {
                 return mAboveAnchor
                         ? com.android.internal.R.style.Animation_DropDownUp
@@ -1243,7 +1385,7 @@
      * <p>
      * The height must have been set on the layout parameters prior to calling
      * this method.
-     * 
+     *
      * @param anchor the view on which the popup window must be anchored
      * @param p the layout parameters used to display the drop down
      * @param xoff horizontal offset used to adjust for background padding
@@ -1342,18 +1484,18 @@
         p.gravity |= Gravity.DISPLAY_CLIP_VERTICAL;
 
         // Compute the position of the anchor relative to the popup.
-        mAnchorRelativeX = mDrawingLocation[0] - p.x + anchorHeight / 2;
-        mAnchorRelativeY = mDrawingLocation[1] - p.y + anchorWidth / 2;
+        mAnchorBounds.set(0, 0, anchorWidth, anchorHeight);
+        mAnchorBounds.offset(mDrawingLocation[0] - p.x, mDrawingLocation[1] - p.y);
 
         return onTop;
     }
-    
+
     /**
      * Returns the maximum height that is available for the popup to be
      * completely shown. It is recommended that this height be the maximum for
      * the popup's height, otherwise it is possible that the popup will be
      * clipped.
-     * 
+     *
      * @param anchor The view on which the popup window must be anchored.
      * @return The maximum available height for the popup to be completely
      *         shown.
@@ -1376,14 +1518,14 @@
     public int getMaxAvailableHeight(View anchor, int yOffset) {
         return getMaxAvailableHeight(anchor, yOffset, false);
     }
-    
+
     /**
      * Returns the maximum height that is available for the popup to be
      * completely shown, optionally ignoring any bottom decorations such as
      * the input method. It is recommended that this height be the maximum for
      * the popup's height, otherwise it is possible that the popup will be
      * clipped.
-     * 
+     *
      * @param anchor The view on which the popup window must be anchored.
      * @param yOffset y offset from the view's bottom edge
      * @param ignoreBottomDecorations if true, the height returned will be
@@ -1391,7 +1533,7 @@
      *        bottom decorations
      * @return The maximum available height for the popup to be completely
      *         shown.
-     *         
+     *
      * @hide Pending API council approval.
      */
     public int getMaxAvailableHeight(View anchor, int yOffset, boolean ignoreBottomDecorations) {
@@ -1400,7 +1542,7 @@
 
         final int[] anchorPos = mDrawingLocation;
         anchor.getLocationOnScreen(anchorPos);
-        
+
         int bottomEdge = displayFrame.bottom;
         if (ignoreBottomDecorations) {
             Resources res = anchor.getContext().getResources();
@@ -1413,49 +1555,78 @@
         int returnedHeight = Math.max(distanceToBottom, distanceToTop);
         if (mBackground != null) {
             mBackground.getPadding(mTempRect);
-            returnedHeight -= mTempRect.top + mTempRect.bottom; 
+            returnedHeight -= mTempRect.top + mTempRect.bottom;
         }
-        
+
         return returnedHeight;
     }
-    
+
     /**
      * <p>Dispose of the popup window. This method can be invoked only after
      * {@link #showAsDropDown(android.view.View)} has been executed. Failing that, calling
      * this method will have no effect.</p>
      *
-     * @see #showAsDropDown(android.view.View) 
+     * @see #showAsDropDown(android.view.View)
      */
     public void dismiss() {
-        if (isShowing() && mPopupView != null) {
+        if (isShowing() && mDecorView != null) {
             mIsShowing = false;
 
             unregisterForScrollChanged();
 
-            try {
-                mWindowManager.removeViewImmediate(mPopupView);
-            } finally {
-                if (mPopupView != mContentView && mPopupView instanceof ViewGroup) {
-                    ((ViewGroup) mPopupView).removeView(mContentView);
-                }
-                mPopupView = null;
+            if (mExitTransition != null) {
+                mExitTransition.addTarget(mBackgroundView);
+                mExitTransition.addListener(new Transition.TransitionListenerAdapter() {
+                    @Override
+                    public void onTransitionEnd(Transition transition) {
+                        transition.removeListener(this);
+                        transition.removeTarget(mBackgroundView);
 
-                if (mOnDismissListener != null) {
-                    mOnDismissListener.onDismiss();
-                }
+                        dismissImmediate();
+                    }
+                });
+
+                TransitionManager.beginDelayedTransition(mDecorView, mExitTransition);
+
+                // Transition to invisible.
+                mBackgroundView.setVisibility(View.INVISIBLE);
+            } else {
+                dismissImmediate();
+            }
+        }
+    }
+
+    /**
+     * Removes the popup from the window manager and tears down the supporting
+     * view hierarchy, if necessary.
+     */
+    private void dismissImmediate() {
+        try {
+            mWindowManager.removeViewImmediate(mDecorView);
+        } finally {
+            mDecorView.removeView(mBackgroundView);
+            mDecorView = null;
+
+            if (mBackgroundView != mContentView) {
+                ((ViewGroup) mBackgroundView).removeView(mContentView);
+            }
+            mBackgroundView = null;
+
+            if (mOnDismissListener != null) {
+                mOnDismissListener.onDismiss();
             }
         }
     }
 
     /**
      * Sets the listener to be called when the window is dismissed.
-     * 
+     *
      * @param onDismissListener The listener.
      */
     public void setOnDismissListener(OnDismissListener onDismissListener) {
         mOnDismissListener = onDismissListener;
     }
-    
+
     /**
      * Updates the state of the popup window, if it is currently being displayed,
      * from the currently set state.  This includes:
@@ -1467,12 +1638,12 @@
         if (!isShowing() || mContentView == null) {
             return;
         }
-        
-        WindowManager.LayoutParams p = (WindowManager.LayoutParams)
-                mPopupView.getLayoutParams();
-        
+
+        final WindowManager.LayoutParams p =
+                (WindowManager.LayoutParams) mDecorView.getLayoutParams();
+
         boolean update = false;
-        
+
         final int newAnim = computeAnimationResource();
         if (newAnim != p.windowAnimations) {
             p.windowAnimations = newAnim;
@@ -1487,7 +1658,7 @@
 
         if (update) {
             setLayoutDirectionFromAnchor();
-            mWindowManager.updateViewLayout(mPopupView, p);
+            mWindowManager.updateViewLayout(mDecorView, p);
         }
     }
 
@@ -1500,11 +1671,11 @@
      * @param height the new height
      */
     public void update(int width, int height) {
-        WindowManager.LayoutParams p = (WindowManager.LayoutParams)
-                mPopupView.getLayoutParams();
+        final WindowManager.LayoutParams p =
+                (WindowManager.LayoutParams) mDecorView.getLayoutParams();
         update(p.x, p.y, width, height, false);
     }
-    
+
     /**
      * <p>Updates the position and the dimension of the popup window. Width and
      * height can be set to -1 to update location only.  Calling this function
@@ -1548,7 +1719,8 @@
             return;
         }
 
-        WindowManager.LayoutParams p = (WindowManager.LayoutParams) mPopupView.getLayoutParams();
+        final WindowManager.LayoutParams p =
+                (WindowManager.LayoutParams) mDecorView.getLayoutParams();
 
         boolean update = force;
 
@@ -1588,7 +1760,7 @@
 
         if (update) {
             setLayoutDirectionFromAnchor();
-            mWindowManager.updateViewLayout(mPopupView, p);
+            mWindowManager.updateViewLayout(mDecorView, p);
         }
     }
 
@@ -1655,7 +1827,7 @@
         }
 
         final WindowManager.LayoutParams p =
-                (WindowManager.LayoutParams) mPopupView.getLayoutParams();
+                (WindowManager.LayoutParams) mDecorView.getLayoutParams();
         final int x = p.x;
         final int y = p.y;
         if (updateLocation) {
@@ -1694,7 +1866,7 @@
     private void registerForScrollChanged(View anchor, int xoff, int yoff, int gravity) {
         unregisterForScrollChanged();
 
-        mAnchor = new WeakReference<View>(anchor);
+        mAnchor = new WeakReference<>(anchor);
         ViewTreeObserver vto = anchor.getViewTreeObserver();
         if (vto != null) {
             vto.addOnScrollChangedListener(mOnScrollChangedListener);
@@ -1705,23 +1877,49 @@
         mAnchoredGravity = gravity;
     }
 
-    private class PopupViewContainer extends FrameLayout {
-        private static final String TAG = "PopupWindow.PopupViewContainer";
+    /**
+     * Layout listener used to run a transition immediately after a view is
+     * laid out. Forces the view to transition from invisible to visible.
+     */
+    private static class PostLayoutTransitionListener implements
+            ViewTreeObserver.OnGlobalLayoutListener {
+        private final ViewGroup mSceneRoot;
+        private final Transition mTransition;
 
-        public PopupViewContainer(Context context) {
-            super(context);
+        public PostLayoutTransitionListener(ViewGroup sceneRoot, Transition transition) {
+            mSceneRoot = sceneRoot;
+            mTransition = transition;
         }
 
         @Override
-        protected int[] onCreateDrawableState(int extraSpace) {
-            if (mAboveAnchor) {
-                // 1 more needed for the above anchor state
-                final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
-                View.mergeDrawableStates(drawableState, ABOVE_ANCHOR_STATE_SET);
-                return drawableState;
-            } else {
-                return super.onCreateDrawableState(extraSpace);
+        public void onGlobalLayout() {
+            final ViewTreeObserver observer = mSceneRoot.getViewTreeObserver();
+            if (observer == null) {
+                // View has been detached.
+                return;
             }
+
+            observer.removeOnGlobalLayoutListener(this);
+
+            // Set all targets to be initially invisible.
+            final List<View> targets = mTransition.getTargets();
+            final int N = targets.size();
+            for (int i = 0; i < N; i++) {
+                targets.get(i).setVisibility(View.INVISIBLE);
+            }
+
+            TransitionManager.beginDelayedTransition(mSceneRoot, mTransition);
+
+            // Transition targets to visible.
+            for (int i = 0; i < N; i++) {
+                targets.get(i).setVisibility(View.VISIBLE);
+            }
+        }
+    }
+
+    private class PopupDecorView extends FrameLayout {
+        public PopupDecorView(Context context) {
+            super(context);
         }
 
         @Override
@@ -1731,15 +1929,14 @@
                     return super.dispatchKeyEvent(event);
                 }
 
-                if (event.getAction() == KeyEvent.ACTION_DOWN
-                        && event.getRepeatCount() == 0) {
-                    KeyEvent.DispatcherState state = getKeyDispatcherState();
+                if (event.getAction() == KeyEvent.ACTION_DOWN && event.getRepeatCount() == 0) {
+                    final KeyEvent.DispatcherState state = getKeyDispatcherState();
                     if (state != null) {
                         state.startTracking(event, this);
                     }
                     return true;
                 } else if (event.getAction() == KeyEvent.ACTION_UP) {
-                    KeyEvent.DispatcherState state = getKeyDispatcherState();
+                    final KeyEvent.DispatcherState state = getKeyDispatcherState();
                     if (state != null && state.isTracking(event) && !event.isCanceled()) {
                         dismiss();
                         return true;
@@ -1763,7 +1960,7 @@
         public boolean onTouchEvent(MotionEvent event) {
             final int x = (int) event.getX();
             final int y = (int) event.getY();
-            
+
             if ((event.getAction() == MotionEvent.ACTION_DOWN)
                     && ((x < 0) || (x >= getWidth()) || (y < 0) || (y >= getHeight()))) {
                 dismiss();
@@ -1775,17 +1972,22 @@
                 return super.onTouchEvent(event);
             }
         }
+    }
 
-    /** @hide */
+    private class PopupBackgroundView extends FrameLayout {
+        public PopupBackgroundView(Context context) {
+            super(context);
+        }
+
         @Override
-        public void sendAccessibilityEventInternal(int eventType) {
-            // clinets are interested in the content not the container, make it event source
-            if (mContentView != null) {
-                mContentView.sendAccessibilityEvent(eventType);
+        protected int[] onCreateDrawableState(int extraSpace) {
+            if (mAboveAnchor) {
+                final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
+                View.mergeDrawableStates(drawableState, ABOVE_ANCHOR_STATE_SET);
+                return drawableState;
             } else {
-                super.sendAccessibilityEventInternal(eventType);
+                return super.onCreateDrawableState(extraSpace);
             }
         }
     }
-    
 }
diff --git a/core/java/com/android/internal/transition/EpicenterClipReveal.java b/core/java/com/android/internal/transition/EpicenterClipReveal.java
new file mode 100644
index 0000000..d8a7f16
--- /dev/null
+++ b/core/java/com/android/internal/transition/EpicenterClipReveal.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2015 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 com.android.internal.transition;
+
+import android.animation.Animator;
+import android.animation.ObjectAnimator;
+import android.animation.RectEvaluator;
+import android.content.Context;
+import android.graphics.Rect;
+import android.transition.TransitionValues;
+import android.transition.Visibility;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+
+/**
+ * EpicenterClipReveal captures the {@link View#getClipBounds()} before and
+ * after the scene change and animates between those and the epicenter bounds
+ * during a visibility transition.
+ */
+public class EpicenterClipReveal extends Visibility {
+    private static final String PROPNAME_CLIP = "android:epicenterReveal:clip";
+    private static final String PROPNAME_BOUNDS = "android:epicenterReveal:bounds";
+
+    public EpicenterClipReveal() {}
+
+    public EpicenterClipReveal(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public void captureStartValues(TransitionValues transitionValues) {
+        super.captureStartValues(transitionValues);
+        captureValues(transitionValues);
+    }
+
+    @Override
+    public void captureEndValues(TransitionValues transitionValues) {
+        super.captureEndValues(transitionValues);
+        captureValues(transitionValues);
+    }
+
+    private void captureValues(TransitionValues values) {
+        final View view = values.view;
+        if (view.getVisibility() == View.GONE) {
+            return;
+        }
+
+        final Rect clip = view.getClipBounds();
+        values.values.put(PROPNAME_CLIP, clip);
+
+        if (clip == null) {
+            final Rect bounds = new Rect(0, 0, view.getWidth(), view.getHeight());
+            values.values.put(PROPNAME_BOUNDS, bounds);
+        }
+    }
+
+    @Override
+    public Animator onAppear(ViewGroup sceneRoot, View view,
+            TransitionValues startValues, TransitionValues endValues) {
+        if (endValues == null) {
+            return null;
+        }
+
+        final Rect start = getEpicenter();
+        final Rect end = getBestRect(endValues);
+
+        // Prepare the view.
+        view.setClipBounds(start);
+
+        return createRectAnimator(view, start, end);
+    }
+
+    @Override
+    public Animator onDisappear(ViewGroup sceneRoot, View view,
+            TransitionValues startValues, TransitionValues endValues) {
+        if (startValues == null) {
+            return null;
+        }
+
+        final Rect start = getBestRect(startValues);
+        final Rect end = getEpicenter();
+
+        // Prepare the view.
+        view.setClipBounds(start);
+
+        return createRectAnimator(view, start, end);
+    }
+
+    private Rect getBestRect(TransitionValues values) {
+        final Rect clipRect = (Rect) values.values.get(PROPNAME_CLIP);
+        if (clipRect == null) {
+            return (Rect) values.values.get(PROPNAME_BOUNDS);
+        }
+        return clipRect;
+    }
+
+    private Animator createRectAnimator(View view, Rect start, Rect end) {
+        final RectEvaluator evaluator = new RectEvaluator(new Rect());
+        return ObjectAnimator.ofObject(view, "clipBounds", evaluator, start, end);
+    }
+}
diff --git a/core/res/res/transition/popup_window_enter.xml b/core/res/res/transition/popup_window_enter.xml
new file mode 100644
index 0000000..92d4c1e
--- /dev/null
+++ b/core/res/res/transition/popup_window_enter.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.
+-->
+<transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
+               android:transitionOrdering="together">
+     <transition class="com.android.internal.transition.EpicenterClipReveal"
+         android:interpolator="@android:interpolator/accelerate_cubic"
+         android:startDelay="50"
+         android:duration="300" />
+     <fade
+         android:interpolator="@android:interpolator/linear"
+         android:duration="100" />
+</transitionSet>
diff --git a/core/res/res/transition/popup_window_exit.xml b/core/res/res/transition/popup_window_exit.xml
new file mode 100644
index 0000000..5cb9f0b
--- /dev/null
+++ b/core/res/res/transition/popup_window_exit.xml
@@ -0,0 +1,17 @@
+<?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.
+-->
+<fade xmlns:android="http://schemas.android.com/apk/res/android"
+      android:interpolator="@android:interpolator/linear" />
diff --git a/core/res/res/values/attrs.xml b/core/res/res/values/attrs.xml
index 39c42ee..208c8ba 100644
--- a/core/res/res/values/attrs.xml
+++ b/core/res/res/values/attrs.xml
@@ -4338,6 +4338,10 @@
         <attr name="popupAnimationStyle" format="reference" />
         <!-- Whether the popup window should overlap its anchor view. -->
         <attr name="overlapAnchor" format="boolean" />
+        <!-- Transition used to move views into the popup window. -->
+        <attr name="popupEnterTransition" format="reference" />
+        <!-- Transition used to move views out of the popup window. -->
+        <attr name="popupExitTransition" format="reference" />
     </declare-styleable>
     <declare-styleable name="ListPopupWindow">
         <!-- Amount of pixels by which the drop down should be offset vertically. -->
diff --git a/core/res/res/values/styles_material.xml b/core/res/res/values/styles_material.xml
index 4329809..48645ed 100644
--- a/core/res/res/values/styles_material.xml
+++ b/core/res/res/values/styles_material.xml
@@ -770,6 +770,9 @@
         <item name="dropDownSelector">?attr/listChoiceBackgroundIndicator</item>
         <item name="popupBackground">@drawable/popup_background_material</item>
         <item name="popupElevation">@dimen/floating_window_z</item>
+        <item name="popupAnimationStyle">@empty</item>
+        <item name="popupEnterTransition">@transition/popup_window_enter</item>
+        <item name="popupExitTransition">@transition/popup_window_exit</item>
         <item name="dropDownVerticalOffset">0dip</item>
         <item name="dropDownHorizontalOffset">0dip</item>
         <item name="overlapAnchor">true</item>
@@ -780,11 +783,7 @@
     </style>
 
     <style name="Widget.Material.Spinner.DropDown"/>
-
-    <style name="Widget.Material.Spinner.DropDown.ActionBar">
-        <item name="background">@drawable/spinner_background_material</item>
-        <item name="overlapAnchor">true</item>
-    </style>
+    <style name="Widget.Material.Spinner.DropDown.ActionBar" />
 
     <style name="Widget.Material.Spinner.Underlined">
         <item name="background">@drawable/spinner_textfield_background_material</item>
@@ -847,7 +846,9 @@
         <item name="dropDownSelector">?attr/listChoiceBackgroundIndicator</item>
         <item name="popupBackground">@drawable/popup_background_material</item>
         <item name="popupElevation">@dimen/floating_window_z</item>
-        <item name="popupAnimationStyle">@style/Animation.Material.Popup</item>
+        <item name="popupAnimationStyle">@empty</item>
+        <item name="popupEnterTransition">@transition/popup_window_enter</item>
+        <item name="popupExitTransition">@transition/popup_window_exit</item>
         <item name="dropDownVerticalOffset">0dip</item>
         <item name="dropDownHorizontalOffset">0dip</item>
         <item name="dropDownWidth">wrap_content</item>