I want to integrate Google drive with my app I have registered my app in Google Developers Console. I got a sample from https://github.com/googledrive/android-demos .By this
What is EXISTING_FOLDER_ID? If you are trying to just run the sample straight out without having made any changes, this won't work.
You need to change EXISTING_FOLDER_ID to the resource id of a folder that your app has access to. This could be a folder that your app created in the root.