If you are just interested in integrating with forms, and don't care too much about the details of how it works I suggest using the [GoogleFormUploader] 1 Library. This project will give you the "behind the scenes look" at how it works. Whereas the library will give you a cleaner API to accomplish the same task.
Example Android application that demonstrates how to upload some data into a Google form/spreadsheet.
For best support, Import this project into Android Developer Studio and make your necessary changes.