Expendable navigation drawer menu errors

I have got a problem with the the code which I need you to look at. I have attached the custom recyclerview adapter to my project and I'm getting random errors included "Method does not override method from its superclass", Cannot resolve method 'onSaveInstanceState' in 'RecyclerAdapter1', Cannot resolve method 'onRestoreInstanceState' in 'RecyclerAdapter1' and the error for the adapter which it need to be fixing. When you fix this, I want you to add the code to click on each menu item to set from one menu item to another menu item as normal to bold and from bold to normal then normal to bold. I will pay $40 and 1 day deadline. No time wasters please. Thanks for your interest.