Make simple user switcher notice setting changes.

To do this just check the state from the controller (which listens
for changes), rather than holding state locally.

Bug: 16888009
Change-Id: Ifdbf0055c7aa100941c6504cf3f469031c9c6e43

Author: Monkopedia

packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardUserSwitcher.java

@@ -49,10 +49,10 @@ public class KeyguardUserSwitcher {
     private final ViewGroup mUserSwitcher;
     private final KeyguardStatusBarView mStatusBarView;
     private final Adapter mAdapter;
-    private final boolean mSimpleUserSwitcher;
     private final AppearAnimationUtils mAppearAnimationUtils;
     private final KeyguardUserSwitcherScrim mBackground;
     private ObjectAnimator mBgAnimator;
+    private UserSwitcherController mUserSwitcherController;
 
     public KeyguardUserSwitcher(Context context, ViewStub userSwitcher,
             KeyguardStatusBarView statusBarView, NotificationPanelView panelView,
@@ -66,15 +66,14 @@ public KeyguardUserSwitcher(Context context, ViewStub userSwitcher,
             panelView.setKeyguardUserSwitcher(this);
             mAdapter = new Adapter(context, userSwitcherController);
             mAdapter.registerDataSetObserver(mDataSetObserver);
-            mSimpleUserSwitcher = userSwitcherController.isSimpleUserSwitcher();
+            mUserSwitcherController = userSwitcherController;
             mAppearAnimationUtils = new AppearAnimationUtils(context, 400, -0.5f, 0.5f,
                     AnimationUtils.loadInterpolator(
                             context, android.R.interpolator.fast_out_slow_in));
         } else {
             mUserSwitcher = null;
             mStatusBarView = null;
             mAdapter = null;
-            mSimpleUserSwitcher = false;
             mAppearAnimationUtils = null;
             mBackground = null;
         }
@@ -95,7 +94,7 @@ public void setKeyguard(boolean keyguard, boolean animate) {
      * @see android.os.UserManager#isUserSwitcherEnabled()
      */
     private boolean shouldExpandByDefault() {
-        return mSimpleUserSwitcher;
+        return (mUserSwitcherController != null) && mUserSwitcherController.isSimpleUserSwitcher();
     }
 
     public void show(boolean animate) {