Cleanup the status bar flow.

 - Don't round trip to the status bar manager to know the state
 - Manage the state of icons closer to where they are displayed
 - Move StatusBarIconList into SysUI because it isn't used elsewhere now

Change-Id: I99c4c290c18fc776914a43b1cde157f92bb36ac2
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
index fdfce6c..6efb774 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
@@ -21,7 +21,6 @@
 import android.animation.TimeInterpolator;
 import android.app.ActivityManager;
 import android.app.ActivityManagerNative;
-import android.app.INotificationManager;
 import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
@@ -82,11 +81,9 @@
 import android.widget.RemoteViews;
 import android.widget.TextView;
 import android.widget.Toast;
-
 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.statusbar.IStatusBarService;
 import com.android.internal.statusbar.StatusBarIcon;
-import com.android.internal.statusbar.StatusBarIconList;
 import com.android.internal.util.NotificationColorUtil;
 import com.android.internal.widget.LockPatternUtils;
 import com.android.keyguard.KeyguardUpdateMonitor;
@@ -647,13 +644,14 @@
                 android.R.interpolator.fast_out_linear_in);
 
         // Connect in to the status bar manager service
-        StatusBarIconList iconList = new StatusBarIconList();
-        mCommandQueue = new CommandQueue(this, iconList);
+        mCommandQueue = new CommandQueue(this);
 
         int[] switches = new int[8];
         ArrayList<IBinder> binders = new ArrayList<IBinder>();
+        ArrayList<String> iconSlots = new ArrayList<>();
+        ArrayList<StatusBarIcon> icons = new ArrayList<>();
         try {
-            mBarService.registerStatusBar(mCommandQueue, iconList, switches, binders);
+            mBarService.registerStatusBar(mCommandQueue, iconSlots, icons, switches, binders);
         } catch (RemoteException ex) {
             // If the system process isn't there we're doomed anyway.
         }
@@ -668,14 +666,10 @@
         setImeWindowStatus(binders.get(0), switches[3], switches[4], switches[5] != 0);
 
         // Set up the initial icon state
-        int N = iconList.size();
+        int N = iconSlots.size();
         int viewIndex = 0;
-        for (int i=0; i<N; i++) {
-            StatusBarIcon icon = iconList.getIcon(i);
-            if (icon != null) {
-                addIcon(iconList.getSlot(i), i, viewIndex, icon);
-                viewIndex++;
-            }
+        for (int i=0; i < N; i++) {
+            setIcon(iconSlots.get(i), icons.get(i));
         }
 
         // Set up the initial notification state.
@@ -691,7 +685,7 @@
         if (DEBUG) {
             Log.d(TAG, String.format(
                     "init: icons=%d disabled=0x%08x lights=0x%08x menu=0x%08x imeButton=0x%08x",
-                   iconList.size(),
+                   icons.size(),
                    switches[0],
                    switches[1],
                    switches[2],
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java b/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
index 5a2758d..cc26223 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
@@ -21,10 +21,8 @@
 import android.os.IBinder;
 import android.os.Message;
 import android.util.Pair;
-
 import com.android.internal.statusbar.IStatusBar;
 import com.android.internal.statusbar.StatusBarIcon;
-import com.android.internal.statusbar.StatusBarIconList;
 
 /**
  * This class takes the functions from IStatusBar that come in on
@@ -76,7 +74,7 @@
 
     private static final String SHOW_IME_SWITCHER_KEY = "showImeSwitcherKey";
 
-    private StatusBarIconList mList;
+    private final Object mLock = new Object();
     private Callbacks mCallbacks;
     private Handler mHandler = new H();
 
@@ -84,10 +82,8 @@
      * These methods are called back on the main thread.
      */
     public interface Callbacks {
-        public void addIcon(String slot, int index, int viewIndex, StatusBarIcon icon);
-        public void updateIcon(String slot, int index, int viewIndex,
-                StatusBarIcon old, StatusBarIcon icon);
-        public void removeIcon(String slot, int index, int viewIndex);
+        public void setIcon(String slot, StatusBarIcon icon);
+        public void removeIcon(String slot);
         public void disable(int state1, int state2, boolean animate);
         public void animateExpandNotificationsPanel();
         public void animateCollapsePanels(int flags);
@@ -115,57 +111,55 @@
         public void onCameraLaunchGestureDetected(int source);
     }
 
-    public CommandQueue(Callbacks callbacks, StatusBarIconList list) {
+    public CommandQueue(Callbacks callbacks) {
         mCallbacks = callbacks;
-        mList = list;
     }
 
-    public void setIcon(int index, StatusBarIcon icon) {
-        synchronized (mList) {
-            int what = MSG_ICON | index;
-            mHandler.removeMessages(what);
-            mHandler.obtainMessage(what, OP_SET_ICON, 0, icon.clone()).sendToTarget();
+    public void setIcon(String slot, StatusBarIcon icon) {
+        synchronized (mLock) {
+            // don't coalesce these
+            mHandler.obtainMessage(MSG_ICON, OP_SET_ICON, 0,
+                    new Pair<String, StatusBarIcon>(slot, icon)).sendToTarget();
         }
     }
 
-    public void removeIcon(int index) {
-        synchronized (mList) {
-            int what = MSG_ICON | index;
-            mHandler.removeMessages(what);
-            mHandler.obtainMessage(what, OP_REMOVE_ICON, 0, null).sendToTarget();
+    public void removeIcon(String slot) {
+        synchronized (mLock) {
+            // don't coalesce these
+            mHandler.obtainMessage(MSG_ICON, OP_REMOVE_ICON, 0, slot).sendToTarget();
         }
     }
 
     public void disable(int state1, int state2) {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_DISABLE);
             mHandler.obtainMessage(MSG_DISABLE, state1, state2, null).sendToTarget();
         }
     }
 
     public void animateExpandNotificationsPanel() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_EXPAND_NOTIFICATIONS);
             mHandler.sendEmptyMessage(MSG_EXPAND_NOTIFICATIONS);
         }
     }
 
     public void animateCollapsePanels() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_COLLAPSE_PANELS);
             mHandler.sendEmptyMessage(MSG_COLLAPSE_PANELS);
         }
     }
 
     public void animateExpandSettingsPanel(String subPanel) {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_EXPAND_SETTINGS);
             mHandler.obtainMessage(MSG_EXPAND_SETTINGS, subPanel).sendToTarget();
         }
     }
 
     public void setSystemUiVisibility(int vis, int mask) {
-        synchronized (mList) {
+        synchronized (mLock) {
             // Don't coalesce these, since it might have one time flags set such as
             // STATUS_BAR_UNHIDE which might get lost.
             mHandler.obtainMessage(MSG_SET_SYSTEMUI_VISIBILITY, vis, mask, null).sendToTarget();
@@ -173,7 +167,7 @@
     }
 
     public void topAppWindowChanged(boolean menuVisible) {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_TOP_APP_WINDOW_CHANGED);
             mHandler.obtainMessage(MSG_TOP_APP_WINDOW_CHANGED, menuVisible ? 1 : 0, 0,
                     null).sendToTarget();
@@ -182,7 +176,7 @@
 
     public void setImeWindowStatus(IBinder token, int vis, int backDisposition,
             boolean showImeSwitcher) {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_SHOW_IME_BUTTON);
             Message m = mHandler.obtainMessage(MSG_SHOW_IME_BUTTON, vis, backDisposition, token);
             m.getData().putBoolean(SHOW_IME_SWITCHER_KEY, showImeSwitcher);
@@ -191,7 +185,7 @@
     }
 
     public void showRecentApps(boolean triggeredFromAltTab) {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_SHOW_RECENT_APPS);
             mHandler.obtainMessage(MSG_SHOW_RECENT_APPS,
                     triggeredFromAltTab ? 1 : 0, 0, null).sendToTarget();
@@ -199,7 +193,7 @@
     }
 
     public void hideRecentApps(boolean triggeredFromAltTab, boolean triggeredFromHomeKey) {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_HIDE_RECENT_APPS);
             mHandler.obtainMessage(MSG_HIDE_RECENT_APPS,
                     triggeredFromAltTab ? 1 : 0, triggeredFromHomeKey ? 1 : 0,
@@ -208,21 +202,21 @@
     }
 
     public void toggleRecentApps() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_TOGGLE_RECENT_APPS);
             mHandler.obtainMessage(MSG_TOGGLE_RECENT_APPS, 0, 0, null).sendToTarget();
         }
     }
 
     public void preloadRecentApps() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_PRELOAD_RECENT_APPS);
             mHandler.obtainMessage(MSG_PRELOAD_RECENT_APPS, 0, 0, null).sendToTarget();
         }
     }
 
     public void cancelPreloadRecentApps() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_CANCEL_PRELOAD_RECENT_APPS);
             mHandler.obtainMessage(MSG_CANCEL_PRELOAD_RECENT_APPS, 0, 0, null).sendToTarget();
         }
@@ -230,61 +224,61 @@
 
     @Override
     public void toggleKeyboardShortcutsMenu() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_TOGGLE_KEYBOARD_SHORTCUTS);
             mHandler.obtainMessage(MSG_TOGGLE_KEYBOARD_SHORTCUTS).sendToTarget();
         }
     }
 
     public void setWindowState(int window, int state) {
-        synchronized (mList) {
+        synchronized (mLock) {
             // don't coalesce these
             mHandler.obtainMessage(MSG_SET_WINDOW_STATE, window, state, null).sendToTarget();
         }
     }
 
     public void buzzBeepBlinked() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_BUZZ_BEEP_BLINKED);
             mHandler.sendEmptyMessage(MSG_BUZZ_BEEP_BLINKED);
         }
     }
 
     public void notificationLightOff() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.sendEmptyMessage(MSG_NOTIFICATION_LIGHT_OFF);
         }
     }
 
     public void notificationLightPulse(int argb, int onMillis, int offMillis) {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.obtainMessage(MSG_NOTIFICATION_LIGHT_PULSE, onMillis, offMillis, argb)
                     .sendToTarget();
         }
     }
 
     public void showScreenPinningRequest() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.sendEmptyMessage(MSG_SHOW_SCREEN_PIN_REQUEST);
         }
     }
 
     public void appTransitionPending() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_APP_TRANSITION_PENDING);
             mHandler.sendEmptyMessage(MSG_APP_TRANSITION_PENDING);
         }
     }
 
     public void appTransitionCancelled() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_APP_TRANSITION_PENDING);
             mHandler.sendEmptyMessage(MSG_APP_TRANSITION_PENDING);
         }
     }
 
     public void appTransitionStarting(long startTime, long duration) {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_APP_TRANSITION_STARTING);
             mHandler.obtainMessage(MSG_APP_TRANSITION_STARTING, Pair.create(startTime, duration))
                     .sendToTarget();
@@ -292,14 +286,14 @@
     }
 
     public void showAssistDisclosure() {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_ASSIST_DISCLOSURE);
             mHandler.obtainMessage(MSG_ASSIST_DISCLOSURE).sendToTarget();
         }
     }
 
     public void startAssist(Bundle args) {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_START_ASSIST);
             mHandler.obtainMessage(MSG_START_ASSIST, args).sendToTarget();
         }
@@ -307,7 +301,7 @@
 
     @Override
     public void onCameraLaunchGestureDetected(int source) {
-        synchronized (mList) {
+        synchronized (mLock) {
             mHandler.removeMessages(MSG_CAMERA_LAUNCH_GESTURE);
             mHandler.obtainMessage(MSG_CAMERA_LAUNCH_GESTURE, source, 0).sendToTarget();
         }
@@ -318,27 +312,14 @@
             final int what = msg.what & MSG_MASK;
             switch (what) {
                 case MSG_ICON: {
-                    final int index = msg.what & INDEX_MASK;
-                    final int viewIndex = mList.getViewIndex(index);
                     switch (msg.arg1) {
                         case OP_SET_ICON: {
-                            StatusBarIcon icon = (StatusBarIcon)msg.obj;
-                            StatusBarIcon old = mList.getIcon(index);
-                            if (old == null) {
-                                mList.setIcon(index, icon);
-                                mCallbacks.addIcon(mList.getSlot(index), index, viewIndex, icon);
-                            } else {
-                                mList.setIcon(index, icon);
-                                mCallbacks.updateIcon(mList.getSlot(index), index, viewIndex,
-                                        old, icon);
-                            }
+                            Pair<String, StatusBarIcon> p = (Pair<String, StatusBarIcon>) msg.obj;
+                            mCallbacks.setIcon(p.first, p.second);
                             break;
                         }
                         case OP_REMOVE_ICON:
-                            if (mList.getIcon(index) != null) {
-                                mList.removeIcon(index);
-                                mCallbacks.removeIcon(mList.getSlot(index), index, viewIndex);
-                            }
+                            mCallbacks.removeIcon((String) msg.obj);
                             break;
                     }
                     break;
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 d688250..cc380d8 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
@@ -83,7 +83,6 @@
 import android.view.ThreadedRenderer;
 import android.view.VelocityTracker;
 import android.view.View;
-import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 import android.view.ViewStub;
 import android.view.WindowManager;
@@ -95,7 +94,6 @@
 import android.view.animation.PathInterpolator;
 import android.widget.ImageView;
 import android.widget.TextView;
-
 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.statusbar.NotificationVisibility;
 import com.android.internal.statusbar.StatusBarIcon;
@@ -152,7 +150,6 @@
 import com.android.systemui.statusbar.policy.NetworkControllerImpl;
 import com.android.systemui.statusbar.policy.NextAlarmController;
 import com.android.systemui.statusbar.policy.PreviewInflater;
-import com.android.systemui.statusbar.policy.RemoteInputView;
 import com.android.systemui.statusbar.policy.RotationLockControllerImpl;
 import com.android.systemui.statusbar.policy.SecurityControllerImpl;
 import com.android.systemui.statusbar.policy.UserInfoController;
@@ -637,8 +634,8 @@
         addNavigationBar();
 
         // Lastly, call to the icon policy to install/update all the icons.
-        mIconPolicy = new PhoneStatusBarPolicy(mContext, mCastController, mHotspotController,
-                mUserInfoController, mBluetoothController);
+        mIconPolicy = new PhoneStatusBarPolicy(mContext, mIconController, mCastController,
+                mHotspotController, mUserInfoController, mBluetoothController);
         mIconPolicy.setCurrentUserSetup(mUserSetup);
         mSettingsObserver.onChange(false); // set up
 
@@ -1239,17 +1236,14 @@
         return lp;
     }
 
-    public void addIcon(String slot, int index, int viewIndex, StatusBarIcon icon) {
-        mIconController.addSystemIcon(slot, index, viewIndex, icon);
+    @Override
+    public void setIcon(String slot, StatusBarIcon icon) {
+        mIconController.setIcon(slot, icon);
     }
 
-    public void updateIcon(String slot, int index, int viewIndex,
-            StatusBarIcon old, StatusBarIcon icon) {
-        mIconController.updateSystemIcon(slot, index, viewIndex, old, icon);
-    }
-
-    public void removeIcon(String slot, int index, int viewIndex) {
-        mIconController.removeSystemIcon(slot, index, viewIndex);
+    @Override
+    public void removeIcon(String slot) {
+        mIconController.removeIcon(slot);
     }
 
     public UserHandle getCurrentUserHandle() {
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarPolicy.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarPolicy.java
index b89cd22..59d831c 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarPolicy.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarPolicy.java
@@ -20,7 +20,6 @@
 import android.app.ActivityManagerNative;
 import android.app.AlarmManager;
 import android.app.AlarmManager.AlarmClockInfo;
-import android.app.StatusBarManager;
 import android.app.SynchronousUserSwitchObserver;
 import android.content.BroadcastReceiver;
 import android.content.Context;
@@ -35,7 +34,6 @@
 import android.provider.Settings.Global;
 import android.telecom.TelecomManager;
 import android.util.Log;
-
 import com.android.internal.telephony.IccCardConstants;
 import com.android.internal.telephony.TelephonyIntents;
 import com.android.systemui.R;
@@ -66,13 +64,13 @@
     private static final String SLOT_MANAGED_PROFILE = "managed_profile";
 
     private final Context mContext;
-    private final StatusBarManager mService;
     private final Handler mHandler = new Handler();
     private final CastController mCast;
     private final HotspotController mHotspot;
     private final AlarmManager mAlarmManager;
     private final UserInfoController mUserInfoController;
     private final UserManager mUserManager;
+    private final StatusBarIconController mIconController;
 
     // Assume it's all good unless we hear otherwise.  We don't always seem
     // to get broadcasts that it *is* there.
@@ -97,18 +95,14 @@
             String action = intent.getAction();
             if (action.equals(AlarmManager.ACTION_NEXT_ALARM_CLOCK_CHANGED)) {
                 updateAlarm();
-            }
-            else if (action.equals(AudioManager.RINGER_MODE_CHANGED_ACTION) ||
+            } else if (action.equals(AudioManager.RINGER_MODE_CHANGED_ACTION) ||
                     action.equals(AudioManager.INTERNAL_RINGER_MODE_CHANGED_ACTION)) {
                 updateVolumeZen();
-            }
-            else if (action.equals(TelephonyIntents.ACTION_SIM_STATE_CHANGED)) {
+            } else if (action.equals(TelephonyIntents.ACTION_SIM_STATE_CHANGED)) {
                 updateSimState(intent);
-            }
-            else if (action.equals(TelecomManager.ACTION_CURRENT_TTY_MODE_CHANGED)) {
+            } else if (action.equals(TelecomManager.ACTION_CURRENT_TTY_MODE_CHANGED)) {
                 updateTTY(intent);
-            }
-            else if (action.equals(Intent.ACTION_MANAGED_PROFILE_AVAILABILITY_CHANGED)) {
+            } else if (action.equals(Intent.ACTION_MANAGED_PROFILE_AVAILABILITY_CHANGED)) {
                 updateQuietState();
                 updateManagedProfile();
             }
@@ -119,18 +113,19 @@
         @Override
         public void run() {
             if (DEBUG) Log.v(TAG, "updateCast: hiding icon NOW");
-            mService.setIconVisibility(SLOT_CAST, false);
+            mIconController.setIconVisibility(SLOT_CAST, false);
         }
     };
 
-    public PhoneStatusBarPolicy(Context context, CastController cast, HotspotController hotspot,
-            UserInfoController userInfoController, BluetoothController bluetooth) {
+    public PhoneStatusBarPolicy(Context context, StatusBarIconController iconController,
+            CastController cast, HotspotController hotspot, UserInfoController userInfoController,
+            BluetoothController bluetooth) {
         mContext = context;
+        mIconController = iconController;
         mCast = cast;
         mHotspot = hotspot;
         mBluetooth = bluetooth;
         mBluetooth.addStateChangedCallback(this);
-        mService = (StatusBarManager) context.getSystemService(Context.STATUS_BAR_SERVICE);
         mAlarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
         mUserInfoController = userInfoController;
         mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
@@ -153,40 +148,40 @@
         }
 
         // TTY status
-        mService.setIcon(SLOT_TTY,  R.drawable.stat_sys_tty_mode, 0, null);
-        mService.setIconVisibility(SLOT_TTY, false);
+        mIconController.setIcon(SLOT_TTY,  R.drawable.stat_sys_tty_mode, null);
+        mIconController.setIconVisibility(SLOT_TTY, false);
 
         // bluetooth status
         updateBluetooth();
 
         // Alarm clock
-        mService.setIcon(SLOT_ALARM_CLOCK, R.drawable.stat_sys_alarm, 0, null);
-        mService.setIconVisibility(SLOT_ALARM_CLOCK, false);
+        mIconController.setIcon(SLOT_ALARM_CLOCK, R.drawable.stat_sys_alarm, null);
+        mIconController.setIconVisibility(SLOT_ALARM_CLOCK, false);
 
         // zen
-        mService.setIcon(SLOT_ZEN, R.drawable.stat_sys_zen_important, 0, null);
-        mService.setIconVisibility(SLOT_ZEN, false);
+        mIconController.setIcon(SLOT_ZEN, R.drawable.stat_sys_zen_important, null);
+        mIconController.setIconVisibility(SLOT_ZEN, false);
 
         // volume
-        mService.setIcon(SLOT_VOLUME, R.drawable.stat_sys_ringer_vibrate, 0, null);
-        mService.setIconVisibility(SLOT_VOLUME, false);
+        mIconController.setIcon(SLOT_VOLUME, R.drawable.stat_sys_ringer_vibrate, null);
+        mIconController.setIconVisibility(SLOT_VOLUME, false);
         updateVolumeZen();
 
         // cast
-        mService.setIcon(SLOT_CAST, R.drawable.stat_sys_cast, 0, null);
-        mService.setIconVisibility(SLOT_CAST, false);
+        mIconController.setIcon(SLOT_CAST, R.drawable.stat_sys_cast, null);
+        mIconController.setIconVisibility(SLOT_CAST, false);
         mCast.addCallback(mCastCallback);
 
         // hotspot
-        mService.setIcon(SLOT_HOTSPOT, R.drawable.stat_sys_hotspot, 0,
+        mIconController.setIcon(SLOT_HOTSPOT, R.drawable.stat_sys_hotspot,
                 mContext.getString(R.string.accessibility_status_bar_hotspot));
-        mService.setIconVisibility(SLOT_HOTSPOT, mHotspot.isHotspotEnabled());
+        mIconController.setIconVisibility(SLOT_HOTSPOT, mHotspot.isHotspotEnabled());
         mHotspot.addCallback(mHotspotCallback);
 
         // managed profile
-        mService.setIcon(SLOT_MANAGED_PROFILE, R.drawable.stat_sys_managed_profile_status, 0,
+        mIconController.setIcon(SLOT_MANAGED_PROFILE, R.drawable.stat_sys_managed_profile_status,
                 mContext.getString(R.string.accessibility_managed_profile));
-        mService.setIconVisibility(SLOT_MANAGED_PROFILE, mManagedProfileIconVisible);
+        mIconController.setIconVisibility(SLOT_MANAGED_PROFILE, mManagedProfileIconVisible);
     }
 
     public void setZenMode(int zen) {
@@ -198,32 +193,27 @@
         final AlarmClockInfo alarm = mAlarmManager.getNextAlarmClock(UserHandle.USER_CURRENT);
         final boolean hasAlarm = alarm != null && alarm.getTriggerTime() > 0;
         final boolean zenNone = mZen == Global.ZEN_MODE_NO_INTERRUPTIONS;
-        mService.setIcon(SLOT_ALARM_CLOCK, zenNone ? R.drawable.stat_sys_alarm_dim
-                : R.drawable.stat_sys_alarm, 0, null);
-        mService.setIconVisibility(SLOT_ALARM_CLOCK, mCurrentUserSetup && hasAlarm);
+        mIconController.setIcon(SLOT_ALARM_CLOCK, zenNone ? R.drawable.stat_sys_alarm_dim
+                : R.drawable.stat_sys_alarm, null);
+        mIconController.setIconVisibility(SLOT_ALARM_CLOCK, mCurrentUserSetup && hasAlarm);
     }
 
     private final void updateSimState(Intent intent) {
         String stateExtra = intent.getStringExtra(IccCardConstants.INTENT_KEY_ICC_STATE);
         if (IccCardConstants.INTENT_VALUE_ICC_ABSENT.equals(stateExtra)) {
             mSimState = IccCardConstants.State.ABSENT;
-        }
-        else if (IccCardConstants.INTENT_VALUE_ICC_CARD_IO_ERROR.equals(stateExtra)) {
+        } else if (IccCardConstants.INTENT_VALUE_ICC_CARD_IO_ERROR.equals(stateExtra)) {
             mSimState = IccCardConstants.State.CARD_IO_ERROR;
-        }
-        else if (IccCardConstants.INTENT_VALUE_ICC_READY.equals(stateExtra)) {
+        } else if (IccCardConstants.INTENT_VALUE_ICC_READY.equals(stateExtra)) {
             mSimState = IccCardConstants.State.READY;
-        }
-        else if (IccCardConstants.INTENT_VALUE_ICC_LOCKED.equals(stateExtra)) {
+        } else if (IccCardConstants.INTENT_VALUE_ICC_LOCKED.equals(stateExtra)) {
             final String lockedReason =
                     intent.getStringExtra(IccCardConstants.INTENT_KEY_LOCKED_REASON);
             if (IccCardConstants.INTENT_VALUE_LOCKED_ON_PIN.equals(lockedReason)) {
                 mSimState = IccCardConstants.State.PIN_REQUIRED;
-            }
-            else if (IccCardConstants.INTENT_VALUE_LOCKED_ON_PUK.equals(lockedReason)) {
+            } else if (IccCardConstants.INTENT_VALUE_LOCKED_ON_PUK.equals(lockedReason)) {
                 mSimState = IccCardConstants.State.PUK_REQUIRED;
-            }
-            else {
+            } else {
                 mSimState = IccCardConstants.State.NETWORK_LOCKED;
             }
         } else {
@@ -270,18 +260,18 @@
         }
 
         if (zenVisible) {
-            mService.setIcon(SLOT_ZEN, zenIconId, 0, zenDescription);
+            mIconController.setIcon(SLOT_ZEN, zenIconId, zenDescription);
         }
         if (zenVisible != mZenVisible) {
-            mService.setIconVisibility(SLOT_ZEN, zenVisible);
+            mIconController.setIconVisibility(SLOT_ZEN, zenVisible);
             mZenVisible = zenVisible;
         }
 
         if (volumeVisible) {
-            mService.setIcon(SLOT_VOLUME, volumeIconId, 0, volumeDescription);
+            mIconController.setIcon(SLOT_VOLUME, volumeIconId, volumeDescription);
         }
         if (volumeVisible != mVolumeVisible) {
-            mService.setIconVisibility(SLOT_VOLUME, volumeVisible);
+            mIconController.setIconVisibility(SLOT_VOLUME, volumeVisible);
             mVolumeVisible = volumeVisible;
         }
         updateAlarm();
@@ -310,8 +300,8 @@
             }
         }
 
-        mService.setIcon(SLOT_BLUETOOTH, iconId, 0, contentDescription);
-        mService.setIconVisibility(SLOT_BLUETOOTH, bluetoothEnabled);
+        mIconController.setIcon(SLOT_BLUETOOTH, iconId, contentDescription);
+        mIconController.setIconVisibility(SLOT_BLUETOOTH, bluetoothEnabled);
     }
 
     private final void updateTTY(Intent intent) {
@@ -324,13 +314,13 @@
         if (enabled) {
             // TTY is on
             if (DEBUG) Log.v(TAG, "updateTTY: set TTY on");
-            mService.setIcon(SLOT_TTY, R.drawable.stat_sys_tty_mode, 0,
+            mIconController.setIcon(SLOT_TTY, R.drawable.stat_sys_tty_mode,
                     mContext.getString(R.string.accessibility_tty_enabled));
-            mService.setIconVisibility(SLOT_TTY, true);
+            mIconController.setIconVisibility(SLOT_TTY, true);
         } else {
             // TTY is off
             if (DEBUG) Log.v(TAG, "updateTTY: set TTY off");
-            mService.setIconVisibility(SLOT_TTY, false);
+            mIconController.setIconVisibility(SLOT_TTY, false);
         }
     }
 
@@ -346,9 +336,9 @@
         if (DEBUG) Log.v(TAG, "updateCast: isCasting: " + isCasting);
         mHandler.removeCallbacks(mRemoveCastIconRunnable);
         if (isCasting) {
-            mService.setIcon(SLOT_CAST, R.drawable.stat_sys_cast, 0,
+            mIconController.setIcon(SLOT_CAST, R.drawable.stat_sys_cast,
                     mContext.getString(R.string.accessibility_casting));
-            mService.setIconVisibility(SLOT_CAST, true);
+            mIconController.setIconVisibility(SLOT_CAST, true);
         } else {
             // don't turn off the screen-record icon for a few seconds, just to make sure the user
             // has seen it
@@ -392,17 +382,19 @@
         final boolean showIcon;
         if (mManagedProfileFocused && !mKeyguardVisible) {
             showIcon = true;
-            mService.setIcon(SLOT_MANAGED_PROFILE, R.drawable.stat_sys_managed_profile_status, 0,
+            mIconController.setIcon(SLOT_MANAGED_PROFILE,
+                    R.drawable.stat_sys_managed_profile_status,
                     mContext.getString(R.string.accessibility_managed_profile));
         } else if (mManagedProfileInQuietMode) {
             showIcon = true;
-            mService.setIcon(SLOT_MANAGED_PROFILE, R.drawable.stat_sys_managed_profile_status_off, 0,
+            mIconController.setIcon(SLOT_MANAGED_PROFILE,
+                    R.drawable.stat_sys_managed_profile_status_off,
                     mContext.getString(R.string.accessibility_managed_profile));
         } else {
             showIcon = false;
         }
         if (mManagedProfileIconVisible != showIcon) {
-            mService.setIconVisibility(SLOT_MANAGED_PROFILE, showIcon);
+            mIconController.setIconVisibility(SLOT_MANAGED_PROFILE, showIcon);
             mManagedProfileIconVisible = showIcon;
         }
     }
@@ -431,7 +423,7 @@
     private final HotspotController.Callback mHotspotCallback = new HotspotController.Callback() {
         @Override
         public void onHotspotChanged(boolean enabled) {
-            mService.setIconVisibility(SLOT_HOTSPOT, enabled);
+            mIconController.setIconVisibility(SLOT_HOTSPOT, enabled);
         }
     };
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconController.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconController.java
index d5b980e..6172752 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconController.java
@@ -21,9 +21,11 @@
 import android.content.Context;
 import android.content.res.ColorStateList;
 import android.graphics.Color;
+import android.graphics.drawable.Icon;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.SystemClock;
+import android.os.UserHandle;
 import android.text.TextUtils;
 import android.util.ArraySet;
 import android.view.View;
@@ -33,7 +35,6 @@
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;
-
 import com.android.internal.statusbar.StatusBarIcon;
 import com.android.internal.util.NotificationColorUtil;
 import com.android.systemui.BatteryMeterView;
@@ -54,7 +55,7 @@
  * limited to: notification icons, signal cluster, additional status icons, and clock in the status
  * bar.
  */
-public class StatusBarIconController implements Tunable {
+public class StatusBarIconController extends StatusBarIconList implements Tunable {
 
     public static final long DEFAULT_TINT_ANIMATION_DURATION = 120;
 
@@ -146,23 +147,27 @@
         }
         // Remove all the icons.
         for (int i = views.size() - 1; i >= 0; i--) {
-            removeSystemIcon(views.get(i).getSlot(), i, i);
+            removeIcon(views.get(i).getSlot());
         }
         // Add them all back
         for (int i = 0; i < views.size(); i++) {
-            addSystemIcon(views.get(i).getSlot(), i, i, views.get(i).getStatusBarIcon());
+            setIcon(views.get(i).getSlot(), views.get(i).getStatusBarIcon());
         }
-    };
+    }
 
     public void updateResources() {
         mIconSize = mContext.getResources().getDimensionPixelSize(
                 com.android.internal.R.dimen.status_bar_icon_size);
         mIconHPadding = mContext.getResources().getDimensionPixelSize(
                 R.dimen.status_bar_icon_padding);
+        defineSlots(mContext.getResources().getStringArray(
+                com.android.internal.R.array.config_statusBarIcons));
         FontSizeUtils.updateFontSize(mClock, R.dimen.status_bar_clock_size);
     }
 
-    public void addSystemIcon(String slot, int index, int viewIndex, StatusBarIcon icon) {
+    private void addSystemIcon(int index, StatusBarIcon icon) {
+        String slot = getSlot(index);
+        int viewIndex = getViewIndex(index);
         boolean blocked = mIconBlacklist.contains(slot);
         StatusBarIconView view = new StatusBarIconView(mContext, slot, null, blocked);
         view.set(icon);
@@ -175,8 +180,61 @@
         applyIconTint();
     }
 
-    public void updateSystemIcon(String slot, int index, int viewIndex,
-            StatusBarIcon old, StatusBarIcon icon) {
+    public void setIcon(String slot, int resourceId, CharSequence contentDescription) {
+        int index = getSlotIndex(slot);
+        StatusBarIcon icon = getIcon(index);
+        if (icon == null) {
+            icon = new StatusBarIcon(UserHandle.SYSTEM, mContext.getPackageName(),
+                    Icon.createWithResource(mContext, resourceId), 0, 0, contentDescription);
+            setIcon(slot, icon);
+        } else {
+            icon.icon = Icon.createWithResource(mContext, resourceId);
+            icon.contentDescription = contentDescription;
+            handleSet(index, icon);
+        }
+    }
+
+    public void setIcon(String slot, StatusBarIcon icon) {
+        setIcon(getSlotIndex(slot), icon);
+    }
+
+    public void removeIcon(String slot) {
+        int index = getSlotIndex(slot);
+        if (getIcon(index) == null) {
+            return;
+        }
+        super.removeIcon(index);
+        int viewIndex = getViewIndex(index);
+        mStatusIcons.removeViewAt(viewIndex);
+        mStatusIconsKeyguard.removeViewAt(viewIndex);
+    }
+
+    public void setIconVisibility(String slot, boolean visibility) {
+        int index = getSlotIndex(slot);
+        StatusBarIcon icon = getIcon(index);
+        if (icon == null || icon.visible == visibility) {
+            return;
+        }
+        icon.visible = visibility;
+        handleSet(index, icon);
+    }
+
+    @Override
+    public void setIcon(int index, StatusBarIcon icon) {
+        boolean isNew = getIcon(index) == null;
+        super.setIcon(index, icon);
+        if (icon == null) {
+            return;
+        }
+        if (isNew) {
+            addSystemIcon(index, icon);
+        } else {
+            handleSet(index, icon);
+        }
+    }
+
+    private void handleSet(int index, StatusBarIcon icon) {
+        int viewIndex = getViewIndex(index);
         StatusBarIconView view = (StatusBarIconView) mStatusIcons.getChildAt(viewIndex);
         view.set(icon);
         view = (StatusBarIconView) mStatusIconsKeyguard.getChildAt(viewIndex);
@@ -184,11 +242,6 @@
         applyIconTint();
     }
 
-    public void removeSystemIcon(String slot, int index, int viewIndex) {
-        mStatusIcons.removeViewAt(viewIndex);
-        mStatusIconsKeyguard.removeViewAt(viewIndex);
-    }
-
     public void updateNotificationIcons(NotificationData notificationData) {
         final LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                 mIconSize + 2*mIconHPadding, mPhoneStatusBar.getStatusBarHeight());
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconList.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconList.java
new file mode 100644
index 0000000..62d6b76
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconList.java
@@ -0,0 +1,86 @@
+/*
+ * 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.systemui.statusbar.phone;
+
+import com.android.internal.statusbar.StatusBarIcon;
+
+import java.io.PrintWriter;
+import java.util.ArrayList;
+
+public class StatusBarIconList {
+    private ArrayList<String> mSlots = new ArrayList<>();
+    private ArrayList<StatusBarIcon> mIcons = new ArrayList<>();
+
+    public void defineSlots(String[] slots) {
+        final int N = slots.length;
+        for (int i=0; i < N; i++) {
+            mSlots.add(slots[i]);
+            mIcons.add(null);
+        }
+    }
+
+    public int getSlotIndex(String slot) {
+        final int N = mSlots.size();
+        for (int i=0; i<N; i++) {
+            if (slot.equals(mSlots.get(i))) {
+                return i;
+            }
+        }
+        // Auto insert new items at the beginning.
+        mSlots.add(0, slot);
+        mIcons.add(0, null);
+        return 0;
+    }
+
+    public int size() {
+        return mSlots.size();
+    }
+
+    public void setIcon(int index, StatusBarIcon icon) {
+        mIcons.set(index, icon);
+    }
+
+    public void removeIcon(int index) {
+        mIcons.set(index, null);
+    }
+
+    public String getSlot(int index) {
+        return mSlots.get(index);
+    }
+
+    public StatusBarIcon getIcon(int index) {
+        return mIcons.get(index);
+    }
+
+    public int getViewIndex(int index) {
+        int count = 0;
+        for (int i = 0; i < index; i++) {
+            if (mIcons.get(i) != null) {
+                count++;
+            }
+        }
+        return count;
+    }
+
+    public void dump(PrintWriter pw) {
+        final int N = mSlots.size();
+        pw.println("Icon list:");
+        for (int i=0; i<N; i++) {
+            pw.printf("  %2d: (%s) %s\n", i, mSlots.get(i), mIcons.get(i));
+        }
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/tv/TvStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/tv/TvStatusBar.java
index 44b41c5..0406ae3 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/tv/TvStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/tv/TvStatusBar.java
@@ -33,16 +33,11 @@
 public class TvStatusBar extends BaseStatusBar {
 
     @Override
-    public void addIcon(String slot, int index, int viewIndex, StatusBarIcon icon) {
+    public void setIcon(String slot, StatusBarIcon icon) {
     }
 
     @Override
-    public void updateIcon(String slot, int index, int viewIndex, StatusBarIcon old,
-            StatusBarIcon icon) {
-    }
-
-    @Override
-    public void removeIcon(String slot, int index, int viewIndex) {
+    public void removeIcon(String slot) {
     }
 
     @Override