Toast.makeText(this, "Note Deleted", Toast.LENGTH_SHORT).show();
why does it say that the method cannot be resloved? is it following a wrong format?
1) Be sure that you have imported the Toast class
2) If it's inside an Activity, your code will work.
3) If it's inside a Fragment, you will need the context to show this:
Toast.makeText(getActivity(),"Note Deleted",Toast.LENGTH_SHORT).show();