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/bluetooth/BluetoothSettings.java

@@ -119,6 +119,14 @@ public final class BluetoothSettings extends DeviceListPreferenceFragment implem
         mSwitchBar = activity.getSwitchBar();
 
         mBluetoothEnabler = new BluetoothEnabler(activity, mSwitchBar);
+        mBluetoothEnabler.setupSwitchBar();
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+
+        mBluetoothEnabler.teardownSwitchBar();
     }
 
     @Override