Looking through stackoverflow, I've found answers as to how to darken a listitem when its being touched so that the user knows which item in the list view is about to be selected.
How to change color of ListView items on focus and on click.
But I cannot find any sort of implementation for that type of function in the Bluetooth Le Gatt sample project provided by Android Studios.
I gave my listitems backgrounds which change their colour from the regular white using an xml file in my drawable folder. This prevented the list item from darkening when touching it.
edit: you can also set your background as selectable to give it an effect when selected/pressed.
android:background="?android:attr/selectableItemBackground"