Copy the menu on the other windows
You probably noticed that the menu disappeared when you changed Activity?
It’s normal ! This is because nothing uses a menu in our Java code.
The easiest solution is to copy and paste the menu code from our file
« MainActivity.java » containing the functions « onCreateOptionMenu » and « onOptionItemSelected » in our « EuroVersDollar.java » file.
This code is after the onCreate function. Remember to change the occurrences of EuroVersDollar with the name of your other activities.