How to get Authorization code of my google drive account in android?

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I am building an application using the reference Google Developer Sample Project.[^] According to this tutorial i will get an authorization code from browser and will put it later in my application.But i don't want to work like this. I need to get the authorization code in direct way. Actually I want to upload file to the Google Drive account with a button click event. Every thing should be done hidden inside button click event.