Best way to store user's data for my app?

Question

I'm developing the first app I would like to release on the play store, and I can't seem to figure out what would be the best way to store data.

User's will input a lot of numbers, which will be used to create different type of graphs. For that reason I need to be sure the data will never be lost, even if they use a new/different Android device. At first I was thinking about a database, but I'm still not sure if my app will be popular enough for me to host a database and spend cash, so I figured it wasn't the best option. Plus, it would require users to create an account.

After some thought I thought I could give the user's the option to either not create an account (but might lose their data in the long run) or create an account but I would still need to maintain a database.

Someone told me they hate creating accounts and said I could just use the Google Drive API for Android. I was looking at the doc and looking at some examples but it is a bit confusing. I would like to read/write/update a sheet, but I can't even seem to find examples on how to do that. There would also be Dropbox.

What would be the best option, in my case, to store data?

Answer 1

我认为最适合您的将是Google的Cloud Save ，我从未使用过，但听起来它最适合您！

Answer 2

I'd go with Google Drive. I use it on my app. You have no cost, and almost every Android user has a Google Drive account. Keep looking and you will find good tutorials about it.

Or you could use also Parse. Very easy to work with. And free until a certain usage limit. www.parse.com