DrEdit is a sample Google Drive app, is a text editor that is capable of editing files with text/* MIME type that are stored in user's Google Drive. It has similar implementations for Java, Python, PHP, .NET, Ruby, Android and iOS. DrEdit also implements two fundamental Google Drive use cases:
The flow for both use cases is similar. Google Drive redirects a user to the app after the user selects it from the Create menu or context menu of a file with a registered MIME type.
These pages provide details for each language-specific sample: