This CL before, onChanged(null) will cause PreferenceGroup didn't update UI in ConnectedDeviceDashboardFragment. This CL remove onChanged(null) and set unvisible of SliceView in the constructor. Bug: 142220754 Test: make -j42 RunSettingsRoboTests Change-Id: Ib20db373430589c5c5efbe8a4c866b7fae4f3399