Android development using Google Spreadsheet

[Justify23]

I am new in android development and I know basic Java and XML I've created an application which requires a lot of text and thinking if it is possible to store the texts on a google spreadsheet then pull it out whenever the user is online. I saw an application like this but it requires google log in. Any possible way to do it without google log in? I found a tutorial but it just gave the entire code without even explaining how it works so I need some help