diff --git a/packages/SystemUI/res/layout/status_bar_expanded.xml b/packages/SystemUI/res/layout/status_bar_expanded.xml
index 23f34251b812c..4ca59f5082add 100644
--- a/packages/SystemUI/res/layout/status_bar_expanded.xml
+++ b/packages/SystemUI/res/layout/status_bar_expanded.xml
@@ -37,12 +37,6 @@
         android:layout_height="match_parent"
         android:layout_width="match_parent" />
 
-    <ViewStub
-        android:id="@+id/keyguard_user_switcher_stub"
-        android:layout="@layout/keyguard_user_switcher"
-        android:layout_height="match_parent"
-        android:layout_width="match_parent" />
-
     <include
         layout="@layout/keyguard_status_view"
         android:visibility="gone" />
@@ -109,5 +103,11 @@
         layout="@layout/keyguard_bottom_area"
         android:visibility="gone" />
 
+    <ViewStub
+        android:id="@+id/keyguard_user_switcher_stub"
+        android:layout="@layout/keyguard_user_switcher"
+        android:layout_height="match_parent"
+        android:layout_width="match_parent" />
+
     <include layout="@layout/status_bar_expanded_plugin_frame"/>
 </com.android.systemui.statusbar.phone.NotificationPanelView>
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelViewController.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelViewController.java
index bb08ee1a32184..093f57adb21a8 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelViewController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelViewController.java
@@ -287,21 +287,6 @@ public class NotificationPanelViewController extends PanelViewController {
                 }
     };
 
-    final KeyguardUserSwitcherController.KeyguardUserSwitcherListener
-            mKeyguardUserSwitcherListener =
-            new KeyguardUserSwitcherController.KeyguardUserSwitcherListener() {
-                @Override
-                public void onKeyguardUserSwitcherChanged(boolean open) {
-                    if (mKeyguardUserSwitcherController == null) {
-                        updateUserSwitcherVisibility(false);
-                    } else if (!mKeyguardUserSwitcherController.isSimpleUserSwitcher()) {
-                        updateUserSwitcherVisibility(open
-                                && mKeyguardStateController.isShowing()
-                                && !mKeyguardStateController.isKeyguardFadingAway());
-                    }
-                }
-            };
-
     private final LayoutInflater mLayoutInflater;
     private final PowerManager mPowerManager;
     private final AccessibilityManager mAccessibilityManager;
@@ -329,7 +314,6 @@ public class NotificationPanelViewController extends PanelViewController {
 
     private KeyguardAffordanceHelper mAffordanceHelper;
     private KeyguardQsUserSwitchController mKeyguardQsUserSwitchController;
-    private boolean mKeyguardUserSwitcherIsShowing;
     private KeyguardUserSwitcherController mKeyguardUserSwitcherController;
     private KeyguardStatusBarView mKeyguardStatusBar;
     private ViewGroup mBigClockContainer;
@@ -811,7 +795,6 @@ public class NotificationPanelViewController extends PanelViewController {
             // Try to close the switcher so that callbacks are triggered if necessary.
             // Otherwise, NPV can get into a state where some of the views are still hidden
             mKeyguardUserSwitcherController.closeSwitcherIfOpenAndNotSimple(false);
-            mKeyguardUserSwitcherController.removeCallback();
         }
 
         mKeyguardQsUserSwitchController = null;
@@ -831,7 +814,6 @@ public class NotificationPanelViewController extends PanelViewController {
                     mKeyguardUserSwitcherComponentFactory.build(keyguardUserSwitcherView);
             mKeyguardUserSwitcherController =
                     userSwitcherComponent.getKeyguardUserSwitcherController();
-            mKeyguardUserSwitcherController.setCallback(mKeyguardUserSwitcherListener);
             mKeyguardUserSwitcherController.init();
             mKeyguardStatusBar.setKeyguardUserSwitcherEnabled(true);
         } else {
@@ -3527,34 +3509,6 @@ public class NotificationPanelViewController extends PanelViewController {
         return false;
     }
 
-    private void updateUserSwitcherVisibility(boolean open) {
-        // Do not update if previously called with the same state.
-        if (mKeyguardUserSwitcherIsShowing == open) {
-            return;
-        }
-        mKeyguardUserSwitcherIsShowing = open;
-
-        if (open) {
-            animateKeyguardStatusBarOut();
-            mKeyguardStatusViewController.setKeyguardStatusViewVisibility(
-                    mBarState,
-                    true /* keyguardFadingAway */,
-                    true /* goingToFullShade */,
-                    mBarState);
-            setKeyguardBottomAreaVisibility(mBarState, true);
-            mNotificationContainerParent.setVisibility(View.GONE);
-        } else {
-            animateKeyguardStatusBarIn(StackStateAnimator.ANIMATION_DURATION_STANDARD);
-            mKeyguardStatusViewController.setKeyguardStatusViewVisibility(
-                    StatusBarState.KEYGUARD,
-                    false,
-                    false,
-                    StatusBarState.SHADE_LOCKED);
-            setKeyguardBottomAreaVisibility(mBarState, false);
-            mNotificationContainerParent.setVisibility(View.VISIBLE);
-        }
-    }
-
     private void updateDisabledUdfpsController() {
         final boolean udfpsEnrolled = mAuthController.getUdfpsRegion() != null
                 && mAuthController.isUdfpsEnrolled(
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardUserSwitcherController.java b/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardUserSwitcherController.java
index b76e451cb6813..8845a05cf6f52 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardUserSwitcherController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardUserSwitcherController.java
@@ -19,9 +19,13 @@ package com.android.systemui.statusbar.policy;
 import static com.android.systemui.statusbar.policy.UserSwitcherController.USER_SWITCH_DISABLED_ALPHA;
 import static com.android.systemui.statusbar.policy.UserSwitcherController.USER_SWITCH_ENABLED_ALPHA;
 
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.ObjectAnimator;
 import android.content.Context;
 import android.content.res.Resources;
 import android.database.DataSetObserver;
+import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.LayerDrawable;
 import android.os.UserHandle;
@@ -50,7 +54,6 @@ import com.android.systemui.statusbar.notification.stack.StackStateAnimator;
 import com.android.systemui.statusbar.phone.DozeParameters;
 import com.android.systemui.util.ViewController;
 
-import java.lang.ref.WeakReference;
 import java.util.ArrayList;
 
 import javax.inject.Inject;
@@ -73,9 +76,10 @@ public class KeyguardUserSwitcherController extends ViewController<KeyguardUserS
     private final KeyguardUserAdapter mAdapter;
     private final KeyguardStateController mKeyguardStateController;
     private final KeyguardUpdateMonitor mKeyguardUpdateMonitor;
-    private WeakReference<KeyguardUserSwitcherListener> mKeyguardUserSwitcherCallback;
     protected final SysuiStatusBarStateController mStatusBarStateController;
     private final KeyguardVisibilityHelper mKeyguardVisibilityHelper;
+    private ObjectAnimator mBgAnimator;
+    private final KeyguardUserSwitcherScrim mBackground;
 
     // Child views of KeyguardUserSwitcherView
     private KeyguardUserSwitcherListView mListView;
@@ -171,6 +175,7 @@ public class KeyguardUserSwitcherController extends ViewController<KeyguardUserS
                 mUserSwitcherController, this);
         mKeyguardVisibilityHelper = new KeyguardVisibilityHelper(mView,
                 keyguardStateController, dozeParameters);
+        mBackground = new KeyguardUserSwitcherScrim(context);
     }
 
     @Override
@@ -204,6 +209,9 @@ public class KeyguardUserSwitcherController extends ViewController<KeyguardUserS
         mKeyguardUpdateMonitor.registerCallback(mInfoCallback);
         mStatusBarStateController.addCallback(mStatusBarStateListener);
         mScreenLifecycle.addObserver(mScreenObserver);
+        mView.addOnLayoutChangeListener(mBackground);
+        mView.setBackground(mBackground);
+        mBackground.setAlpha(0);
     }
 
     @Override
@@ -217,6 +225,9 @@ public class KeyguardUserSwitcherController extends ViewController<KeyguardUserS
         mKeyguardUpdateMonitor.removeCallback(mInfoCallback);
         mStatusBarStateController.removeCallback(mStatusBarStateListener);
         mScreenLifecycle.removeObserver(mScreenObserver);
+        mView.removeOnLayoutChangeListener(mBackground);
+        mView.setBackground(null);
+        mBackground.setAlpha(0);
     }
 
     /**
@@ -338,6 +349,13 @@ public class KeyguardUserSwitcherController extends ViewController<KeyguardUserS
                 animate);
         PropertyAnimator.setProperty(mListView, AnimatableProperty.TRANSLATION_X, -Math.abs(x),
                 ANIMATION_PROPERTIES, animate);
+
+        Rect r = new Rect();
+        mListView.getDrawingRect(r);
+        mView.offsetDescendantRectToMyCoords(mListView, r);
+        mBackground.setGradientCenter(
+                (int) (mListView.getTranslationX() + r.left + r.width() / 2),
+                (int) (mListView.getTranslationY() + r.top + r.height() / 2));
     }
 
     /**
@@ -372,49 +390,52 @@ public class KeyguardUserSwitcherController extends ViewController<KeyguardUserS
     }
 
     /**
-     * Remove the callback if it exists.
-     */
-    public void removeCallback() {
-        if (DEBUG) Log.d(TAG, "removeCallback");
-        mKeyguardUserSwitcherCallback = null;
-    }
-
-    /**
-     * Register to receive notifications about keyguard user switcher state
-     * (see {@link KeyguardUserSwitcherListener}.
-     *
-     * Only one callback can be used at a time.
-     *
-     * @param callback The callback to register
-     */
-    public void setCallback(KeyguardUserSwitcherListener callback) {
-        if (DEBUG) Log.d(TAG, "setCallback");
-        mKeyguardUserSwitcherCallback = new WeakReference<>(callback);
-    }
-
-    /**
-     * If user switcher state changes, notifies all {@link KeyguardUserSwitcherListener}.
-     * Switcher state is updatd before animations finish.
+     * NOTE: switcher state is updated before animations finish.
      *
      * @param animate true to animate transition. The user switcher state (i.e.
      *                {@link #isUserSwitcherOpen()}) is updated before animation is finished.
      */
     private void setUserSwitcherOpened(boolean open, boolean animate) {
-        boolean wasOpen = mUserSwitcherOpen;
         if (DEBUG) {
-            Log.d(TAG, String.format("setUserSwitcherOpened: %b -> %b (animate=%b)", wasOpen,
-                    open, animate));
+            Log.d(TAG,
+                    String.format("setUserSwitcherOpened: %b -> %b (animate=%b)",
+                            mUserSwitcherOpen, open, animate));
         }
         mUserSwitcherOpen = open;
-        if (mUserSwitcherOpen != wasOpen) {
-            notifyUserSwitcherStateChanged();
-        }
         updateVisibilities(animate);
     }
 
     private void updateVisibilities(boolean animate) {
         if (DEBUG) Log.d(TAG, String.format("updateVisibilities: animate=%b", animate));
         mEndGuestButton.animate().cancel();
+        if (mBgAnimator != null) {
+            mBgAnimator.cancel();
+        }
+
+        if (mUserSwitcherOpen) {
+            mBgAnimator = ObjectAnimator.ofInt(mBackground, "alpha", 0, 255);
+            mBgAnimator.setDuration(400);
+            mBgAnimator.setInterpolator(Interpolators.ALPHA_IN);
+            mBgAnimator.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    mBgAnimator = null;
+                }
+            });
+            mBgAnimator.start();
+        } else {
+            mBgAnimator = ObjectAnimator.ofInt(mBackground, "alpha", 255, 0);
+            mBgAnimator.setDuration(400);
+            mBgAnimator.setInterpolator(Interpolators.ALPHA_OUT);
+            mBgAnimator.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    mBgAnimator = null;
+                }
+            });
+            mBgAnimator.start();
+        }
+
         if (mUserSwitcherOpen && mCurrentUserIsGuest) {
             // Show the "End guest session" button
             mEndGuestButton.setVisibility(View.VISIBLE);
@@ -459,34 +480,6 @@ public class KeyguardUserSwitcherController extends ViewController<KeyguardUserS
         return mUserSwitcherOpen;
     }
 
-    private void notifyUserSwitcherStateChanged() {
-        if (DEBUG) {
-            Log.d(TAG, String.format("notifyUserSwitcherStateChanged: mUserSwitcherOpen=%b",
-                    mUserSwitcherOpen));
-        }
-        if (mKeyguardUserSwitcherCallback != null) {
-            KeyguardUserSwitcherListener cb = mKeyguardUserSwitcherCallback.get();
-            if (cb != null) {
-                cb.onKeyguardUserSwitcherChanged(mUserSwitcherOpen);
-            }
-        }
-    }
-
-    /**
-     * Callback for keyguard user switcher state information
-     */
-    public interface KeyguardUserSwitcherListener {
-
-        /**
-         * Called when the keyguard enters or leaves user switcher mode. This will be called
-         * before the animations are finished.
-         *
-         * @param open if true, keyguard is showing the user switcher or transitioning from/to user
-         *             switcher mode.
-         */
-        void onKeyguardUserSwitcherChanged(boolean open);
-    }
-
     static class KeyguardUserAdapter extends
             UserSwitcherController.BaseUserAdapter implements View.OnClickListener {
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardUserSwitcherScrim.java b/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardUserSwitcherScrim.java
index 49f5bcdd5a44a..1d9d33d2aab1b 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardUserSwitcherScrim.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardUserSwitcherScrim.java
@@ -26,7 +26,6 @@ import android.graphics.RadialGradient;
 import android.graphics.Rect;
 import android.graphics.Shader;
 import android.graphics.drawable.Drawable;
-import android.util.LayoutDirection;
 import android.view.View;
 
 import com.android.systemui.R;
@@ -38,13 +37,14 @@ public class KeyguardUserSwitcherScrim extends Drawable
         implements View.OnLayoutChangeListener {
 
     private static final float OUTER_EXTENT = 2.5f;
-    private static final float INNER_EXTENT = 0.75f;
+    private static final float INNER_EXTENT = 0.25f;
 
     private int mDarkColor;
-    private int mTop;
     private int mAlpha = 255;
     private Paint mRadialGradientPaint = new Paint();
-    private int mLayoutWidth;
+    private int mCircleX;
+    private int mCircleY;
+    private int mSize;
 
     public KeyguardUserSwitcherScrim(Context context) {
         mDarkColor = context.getColor(
@@ -53,14 +53,11 @@ public class KeyguardUserSwitcherScrim extends Drawable
 
     @Override
     public void draw(Canvas canvas) {
-        boolean isLtr = getLayoutDirection() == LayoutDirection.LTR;
+        if (mAlpha == 0) {
+            return;
+        }
         Rect bounds = getBounds();
-        float width = bounds.width() * OUTER_EXTENT;
-        float height = (mTop + bounds.height()) * OUTER_EXTENT;
-        canvas.translate(0, -mTop);
-        canvas.scale(1, height / width);
-        canvas.drawRect(isLtr ? bounds.right - width : 0, 0,
-                isLtr ? bounds.right : bounds.left + width, width, mRadialGradientPaint);
+        canvas.drawRect(bounds.left, bounds.top, bounds.right, bounds.bottom, mRadialGradientPaint);
     }
 
     @Override
@@ -88,24 +85,36 @@ public class KeyguardUserSwitcherScrim extends Drawable
     public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft,
             int oldTop, int oldRight, int oldBottom) {
         if (left != oldLeft || top != oldTop || right != oldRight || bottom != oldBottom) {
-            mLayoutWidth = right - left;
-            mTop = top;
+            int width = right - left;
+            int height = bottom - top;
+            mSize = Math.max(width, height);
             updatePaint();
         }
     }
 
     private void updatePaint() {
-        if (mLayoutWidth == 0) {
+        if (mSize == 0) {
             return;
         }
-        float radius = mLayoutWidth * OUTER_EXTENT;
-        boolean isLtr = getLayoutDirection() == LayoutDirection.LTR;
+        float outerRadius = mSize * OUTER_EXTENT;
         mRadialGradientPaint.setShader(
-                new RadialGradient(isLtr ? mLayoutWidth : 0, 0, radius,
+                new RadialGradient(mCircleX, mCircleY, outerRadius,
                         new int[] { Color.argb(
                                         (int) (Color.alpha(mDarkColor) * mAlpha / 255f), 0, 0, 0),
                                 Color.TRANSPARENT },
-                        new float[] { Math.max(0f, mLayoutWidth * INNER_EXTENT / radius), 1f },
+                        new float[] { Math.max(0f, INNER_EXTENT / OUTER_EXTENT), 1f },
                         Shader.TileMode.CLAMP));
     }
+
+    /**
+     * Sets the center of the radial gradient used as a background
+     *
+     * @param x
+     * @param y
+     */
+    public void setGradientCenter(int x, int y) {
+        mCircleX = x;
+        mCircleY = y;
+        updatePaint();
+    }
 }