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Kotlin, app storage: Need to store an ArrayList of Integers from user interaction

I am building an app as part of a project and I am stuck at the moment.
Background: My team is making a "Time-Wasting" App, and the user can press buttons such as "study" to track their time spent on activities - so there will be lots of integers values in the growing ArrayList.
Task:
Store a growing Arraylist(integers) in the app store and retrieve the values for calculation and graph display purposes.
Problem:
I have looked so far how do to this, but I am a bit stuck. Do I use SharedPreferences, the internal app storage or something else. Also, I have a hard time finding code that I could look at and follow what it is doing.
I need:
An efficient way to store the ArrayList (integers) in a storage place and retrieve it for my app. Any suggestions what would be best and where would I find the code for that?
I looked for about 2 weeks through videos and a through stack overflow but I am still stuck and not closer to how I should store this data type in my app.
Thanks, any help much appreciated :)

My opinion avoid the array list and use a database.
It will allow your app to grow including storing extra information along with the time waster including when they chose to do it, how long , etc.
I recommend Room Database it is an ORM for Sqlite it is super easy to use and there is plenty of documentation on implementation as it's apart of the Android Jet Pack.
If you are really stuck on using a list you can use SharedPreferences it doesn't handle ordered lists but you can store your list as a json string.

What is the best way to save all high-scores of multiple levels in android?

I am writing a minesweeper application in android. It's got 3 difficulty modes and I want to save all the scores of all three difficulty modes. If I wanted to store just the high scores for all the modes, I could have done it with a SharedPreferences object but I want to store all the scores and display them to the player sorted by the time taken to solve or date on which it is solved.
I have thought of saving data in a file, or in a json file. I don't want to use SQLite databases because it's too much code.
I simply want to know if there is a better way to do this other than saving everything in a file (maybe in the assets).
There is a similar question but I don't think the accepted solution can be used to solve my problem.

You can use Firebase Database for that. The good thing with the database is that if you want your game to also display the leaderboards to others who are playing it, it shows in real-time. Simply add data when the game ends and filter the results based on the data. Hope this helped, heres a link to get you started here

Best way to add watchlist feature in android app? Store each item in SQLite database or as an object inside an array?

Hi I'm new to programming and I'm learning by trying to copy parts of various apps. Like in this app(its a screenshot)
Should I add every item in SQLite table or object inside arraylist? I want to update the price too every 24 hours so what would be the ideal method?

Is your application connected to a server, and what exactly are you trying to achieve?
For most of the use cases, like if you want to have dynamic datasets and want to application to store the data even after the application is restarted, it is better to store in SQLite.
It would really help if you could explain what exactly are you trying to achieve.

android app with database?

I am trying to develop an android app with a lot of text for item.
For example:
-Item A,description: a lot of words...
-Item B,description: A lot of words...
What is the best practice to do?? Save that text in a database? And if a have 1000 words? Its good practice to do it? I searched in other applications that have the same context but did not find the folder database...So,I am confused..
If the answer is yes,what is the best practice for create the database? Insert onCreate() activity or create the database in third application and put in the app's folder?
Any help will be completely appreciated.

There are three ways to save your data in android :
Using Shared Preferences which save data using (Key,Value) pair which also used to save small amount of data.
Saving data into txt or xml file.
And finally save data into Sqllite Database.
you can go through the following links for more details about that Click Here
And for your case I suggest you go with saving the data into database and you can do so by start reading this tutorial click here, and this, and this.
Hope this help.

Android Best way to access data and if so how to populate the Sqlite database

So, I have data contained in a table of 3 columns with a few hundred rows in PDFs which will get updated quarterly at this time I don't know if they can be presented to me in any other form. I using the ZXing barcode scanner to check against this data to see if the scanned UPC is within it to let the user know if it is an authorized item. I assume I have to save the PDF as Text and then somehow import this information into a SQLite DB and that way I can give the user all the information contained in that row and then from there I can use this information to allow the app to do other things. Unfortunately, when the PDF is saved as text it just separates everything by spaces, so I don't see an easy way to import these into the DB and have them separated into the appropriate columns. Would I need to manually go in and add delimiters and then parse the data to load it into the DB? Or am I looking in the completely wrong way or making any sense at all?
I need this be flexible for updating which is why I think using SQLite DB is the best method and hoping that I can create the DB at install of the app, so it is only populated the one time until I release the update with the new data.
Thanks in advance for help, I think I am close just trying to get pointed in the right direction.