Make the SwitchBar appear immediately

- change the way the SwitchBar is shown and hidden
- save its state
- remove the delay transition code

Change-Id: I07260430e6709b42517ca011f6d3c3446a626731

src/com/android/settings/wifi/WifiSettings.java

@@ -404,6 +404,15 @@ public class WifiSettings extends RestrictedSettingsFragment
         setHasOptionsMenu(true);
     }
 
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+
+        if (mWifiEnabler != null) {
+            mWifiEnabler.teardownSwitchBar();
+        }
+    }
+
     @Override
     public void onStart() {
         super.onStart();
@@ -414,6 +423,7 @@ public class WifiSettings extends RestrictedSettingsFragment
 
             mSwitchBar = activity.getSwitchBar();
             mWifiEnabler = new WifiEnabler(activity, mSwitchBar);
+            mWifiEnabler.setupSwitchBar();
         }
     }