The open picker is the fastest way to get files from OneDrive and OneDrive for Business into your Android app. OneDrive-Picker-Android provides a set of Java APIs that your app can use to browse, select, and download files stored in your user's OneDrive.

You can also get shareable links to files - great for sending to friends, coworkers, and relatives. The open picker also lets your app get thumbnails of image and video files so you don't have to build them yourself.

This is a sample app that is part of a blog post about how to architect android application using the Uncle Bob's clean architecture approach.

The in app purchase system provided by Google is missing one very important thing. This tool will allow app developers to provide their users with codes to be redeemed in app for extra content.

This system uses Parse.com as a simple and free backend to manage your users and codes. All you need to do is create a free account and setup your app. Once you have your client and application keys, you are ready to go.

A SwipeMenu for ListView.

This Java library provides an implementation of macaroons, which are flexible authorization tokens that work great in distributed systems.

Like cookies, macaroons are bearer tokens that enable applications to ascertain whether their holders' actions are authorized. But macaroons are better than cookies!

This project shows how to make simple Burger buttons (animated menu buttons).