diff --git a/core/java/com/android/internal/statusbar/StatusBarNotification.java b/core/java/com/android/internal/statusbar/StatusBarNotification.java
index d443523a2c124..540d134937e83 100644
--- a/core/java/com/android/internal/statusbar/StatusBarNotification.java
+++ b/core/java/com/android/internal/statusbar/StatusBarNotification.java
@@ -19,6 +19,7 @@ package com.android.internal.statusbar;
 import android.app.Notification;
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.os.UserId;
 import android.widget.RemoteViews;
 
 
@@ -132,6 +133,11 @@ public class StatusBarNotification implements Parcelable {
         return ((notification.flags & Notification.FLAG_ONGOING_EVENT) == 0)
                 && ((notification.flags & Notification.FLAG_NO_CLEAR) == 0);
     }
+
+    /** Returns a userHandle for the instance of the app that posted this notification. */
+    public int getUserId() {
+        return UserId.getUserId(this.uid);
+    }
 }
 
 
diff --git a/packages/SystemUI/AndroidManifest.xml b/packages/SystemUI/AndroidManifest.xml
index 51dc3b177954b..676bfd0633844 100644
--- a/packages/SystemUI/AndroidManifest.xml
+++ b/packages/SystemUI/AndroidManifest.xml
@@ -15,6 +15,8 @@
     <uses-permission android:name="android.permission.EXPAND_STATUS_BAR" />
     <uses-permission android:name="android.permission.REMOTE_AUDIO_PLAYBACK" />
 
+    <uses-permission android:name="android.permission.MANAGE_ACCOUNTS" />
+
     <!-- Networking and telephony -->
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
diff --git a/packages/SystemUI/res/layout/status_bar_expanded_header.xml b/packages/SystemUI/res/layout/status_bar_expanded_header.xml
index 7f598b67fb0c8..60896c3b743a5 100644
--- a/packages/SystemUI/res/layout/status_bar_expanded_header.xml
+++ b/packages/SystemUI/res/layout/status_bar_expanded_header.xml
@@ -65,11 +65,24 @@
         android:layout_weight="1"
         />
 
+    <TextView
+        android:id="@+id/header_debug_info"
+        android:visibility="invisible"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical"
+        android:fontFamily="sans-serif-condensed"
+        android:textSize="11dp"
+        android:textStyle="bold"
+        android:textColor="#00A040"
+        android:padding="2dp"
+        />
+    
     <ImageView android:id="@+id/clear_all_button"
         android:layout_width="48dp"
         android:layout_height="48dp"
         android:scaleType="center"
         android:src="@drawable/ic_notify_clear"
         android:contentDescription="@string/accessibility_clear_all"
-        />            
-</LinearLayout>
\ No newline at end of file
+        />     
+</LinearLayout>
diff --git a/packages/SystemUI/res/layout/status_bar_notification_row.xml b/packages/SystemUI/res/layout/status_bar_notification_row.xml
index dd701663848db..3dcdae8c0b6a8 100644
--- a/packages/SystemUI/res/layout/status_bar_notification_row.xml
+++ b/packages/SystemUI/res/layout/status_bar_notification_row.xml
@@ -49,4 +49,17 @@
         android:background="@drawable/bottom_divider_glow"
         />
 
+    <TextView
+        android:id="@+id/debug_info"
+        android:visibility="invisible"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|right"
+        android:fontFamily="sans-serif-condensed"
+        android:textSize="9dp"
+        android:textStyle="bold"
+        android:textColor="#00A040"
+        android:padding="2dp"
+        />
+
 </FrameLayout>
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
index ea5089d0f6668..c9c775353ba39 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
@@ -34,8 +34,10 @@ import android.app.ActivityManagerNative;
 import android.app.KeyguardManager;
 import android.app.PendingIntent;
 import android.app.TaskStackBuilder;
+import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.database.ContentObserver;
@@ -47,6 +49,7 @@ import android.os.IBinder;
 import android.os.Message;
 import android.os.RemoteException;
 import android.os.ServiceManager;
+import android.os.UserId;
 import android.provider.Settings;
 import android.text.TextUtils;
 import android.util.Log;
@@ -65,6 +68,7 @@ import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.PopupMenu;
 import android.widget.RemoteViews;
+import android.widget.TextView;
 
 import java.util.ArrayList;
 
@@ -72,6 +76,7 @@ public abstract class BaseStatusBar extends SystemUI implements
     CommandQueue.Callbacks, RecentsPanelView.OnRecentsPanelVisibilityChangedListener {
     static final String TAG = "StatusBar";
     private static final boolean DEBUG = false;
+    public static final boolean MULTIUSER_DEBUG = false;
 
     protected static final int MSG_OPEN_RECENTS_PANEL = 1020;
     protected static final int MSG_CLOSE_RECENTS_PANEL = 1021;
@@ -112,6 +117,8 @@ public abstract class BaseStatusBar extends SystemUI implements
 
     protected PopupMenu mNotificationBlamePopup;
 
+    protected int mCurrentUserId = 0;
+
     // UI-specific methods
 
     /**
@@ -252,6 +259,40 @@ public abstract class BaseStatusBar extends SystemUI implements
                    switches[3]
                    ));
         }
+
+        // XXX: this is currently broken and will always return 0, but should start working at some point
+        try {
+            mCurrentUserId = ActivityManagerNative.getDefault().getCurrentUser().id;
+        } catch (RemoteException e) {
+            Log.v(TAG, "Couldn't get current user ID; guessing it's 0", e);
+        }
+
+        IntentFilter filter = new IntentFilter();
+        filter.addAction(Intent.ACTION_USER_SWITCHED);
+        mContext.registerReceiver(new BroadcastReceiver() {
+            @Override
+            public void onReceive(Context context, Intent intent) {
+                String action = intent.getAction();
+                if (Intent.ACTION_USER_SWITCHED.equals(action)) {
+                    mCurrentUserId = intent.getIntExtra(Intent.EXTRA_USERID, -1);
+                    if (true) Slog.v(TAG, "userId " + mCurrentUserId + " is in the house");
+                    userSwitched(mCurrentUserId);
+                }
+            }}, filter);
+    }
+
+    public void userSwitched(int newUserId) {
+        // should be overridden
+    }
+
+    public boolean notificationIsForCurrentUser(StatusBarNotification n) {
+        final int thisUserId = mCurrentUserId;
+        final int notificationUserId = n.getUserId();
+        if (DEBUG && MULTIUSER_DEBUG) {
+            Slog.v(TAG, String.format("%s: current userid: %d, notification userid: %d",
+                    n, thisUserId, notificationUserId));
+        }
+        return thisUserId == notificationUserId;
     }
 
     protected View updateNotificationVetoButton(View row, StatusBarNotification n) {
@@ -604,6 +645,14 @@ public abstract class BaseStatusBar extends SystemUI implements
         applyLegacyRowBackground(sbn, content);
 
         row.setTag(R.id.expandable_tag, Boolean.valueOf(large != null));
+
+        if (MULTIUSER_DEBUG) {
+            TextView debug = (TextView) row.findViewById(R.id.debug_info);
+            if (debug != null) {
+                debug.setVisibility(View.VISIBLE);
+                debug.setText("U " + entry.notification.getUserId());
+            }
+        }
         entry.row = row;
         entry.content = content;
         entry.expanded = expandedOneU;
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
index 4d4adcb85a598..4ce4e293790ef 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
@@ -174,6 +174,7 @@ public class PhoneStatusBar extends BaseStatusBar {
     int mNotificationPanelMarginBottomPx, mNotificationPanelMarginPx;
     int mNotificationPanelMinHeight;
     boolean mNotificationPanelIsFullScreenWidth;
+    TextView mNotificationPanelDebugText;
 
     // settings
     PanelView mSettingsPanel;
@@ -343,6 +344,10 @@ public class PhoneStatusBar extends BaseStatusBar {
             mIntruderAlertView.setVisibility(View.GONE);
             mIntruderAlertView.setBar(this);
         }
+        if (MULTIUSER_DEBUG) {
+            mNotificationPanelDebugText = (TextView) mNotificationPanel.findViewById(R.id.header_debug_info);
+            mNotificationPanelDebugText.setVisibility(View.VISIBLE);
+        }
 
         updateShowSearchHoldoff();
 
@@ -806,9 +811,9 @@ public class PhoneStatusBar extends BaseStatusBar {
         // If the device hasn't been through Setup, we only show system notifications
         for (int i=0; i<N; i++) {
             Entry ent = mNotificationData.get(N-i-1);
-            if (provisioned || showNotificationEvenIfUnprovisioned(ent.notification)) {
-                toShow.add(ent.row);
-            }
+            if (!(provisioned || showNotificationEvenIfUnprovisioned(ent.notification))) continue;
+            if (!notificationIsForCurrentUser(ent.notification)) continue;
+            toShow.add(ent.row);
         }
 
         ArrayList<View> toRemove = new ArrayList<View>();
@@ -854,10 +859,10 @@ public class PhoneStatusBar extends BaseStatusBar {
         // If the device hasn't been through Setup, we only show system notifications
         for (int i=0; i<N; i++) {
             Entry ent = mNotificationData.get(N-i-1);
-            if ((provisioned && ent.notification.score >= HIDE_ICONS_BELOW_SCORE)
-                    || showNotificationEvenIfUnprovisioned(ent.notification)) {
-                toShow.add(ent.icon);
-            }
+            if (!((provisioned && ent.notification.score >= HIDE_ICONS_BELOW_SCORE)
+                    || showNotificationEvenIfUnprovisioned(ent.notification))) continue;
+            if (!notificationIsForCurrentUser(ent.notification)) continue;
+            toShow.add(ent.icon);
         }
 
         ArrayList<View> toRemove = new ArrayList<View>();
@@ -1789,6 +1794,7 @@ public class PhoneStatusBar extends BaseStatusBar {
 
     private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
         public void onReceive(Context context, Intent intent) {
+            Slog.v(TAG, "onReceive: " + intent);
             String action = intent.getAction();
             if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)) {
                 int flags = CommandQueue.FLAG_EXCLUDE_NONE;
@@ -1812,6 +1818,13 @@ public class PhoneStatusBar extends BaseStatusBar {
         }
     };
 
+    @Override
+    public void userSwitched(int newUserId) {
+        if (MULTIUSER_DEBUG) mNotificationPanelDebugText.setText("USER " + newUserId);
+        animateCollapse();
+        updateNotificationIcons();
+    }
+    
     private void setIntruderAlertVisibility(boolean vis) {
         if (!ENABLE_INTRUDERS) return;
         if (DEBUG) {