Is it possible to make an application with App Inventor and enable it to remember some things from the last time it closed?
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Yes. Use TinyDB for that.
In future please search the forum and/or read the documentation before asking a question.
With TinyDB you can only enable the first time the application opens to do some activities?
No, tinydb can be used whenever you needed, either to call or store data, not only on initialize
No, it depends how you manage persistent storage. Some my apps need to load a DB the 1st time they start so they connect to a web site and download a CSV file into the local (empty) DB. At startup the app(s) check if the DB is empty or corrupted or valid. In practice they download the DB also if the internal DB is lost or corrupted for every reason.
Since TinyDB can not then is there a way for the application to remember for example how many times it has been opened?
Yes, please search the forum as this has been answered before.
Most send the URL
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