Android : Sony smartwatch 2 check and change back light status programatically

I am working on android app extension for sony smartwatch 2. I have some list and gallery view for that. Now i am able to open gallery view on list item click. I am using ActiveLowPower. When backlight is dim and user clicks on any of listview item it should first change backlight from dim to bright and then if backlight is bright it should call gallery view. How can i check and change smart watch backlight status.