I want to create a button that will save the contents of the app so that when i close it and open it later, i will still see what was there before i closed it. What do i do?
You can use TinyDB to store strings, numbers, booleans, lists and dictionaries.
http://ai2.appinventor.mit.edu/reference/components/storage.html#TinyDB
Please give me the code
Like i wanna save everything in the app. so it looks the same way it looked before the exit
Taken from a free book of App Inventor, this (should) tell you everything you need for the basics in a very detailed manner.
If you want to have the code without making it yourself, it is probably an idea to find a reward you can give for that work.