Strange Loop

Sept 30 - Oct 2, 2021

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Union Station

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St. Louis, MO

Android Squared

Square enables users to accept card payments on Android devices. Square reads magnetic stripe data through the microphone port using a free reader and sends receipts via email or SMS. Square has been featured in the Android Market and at Google I/O.


 Bob and Eric, the programmers behind Square, will demonstrate how magnetic stripe decoding works. They’ll describe Square's unique approach to Intent-based APIs used in the point-of-sale API. They’ll share tips for taming the activity stack and building device-independent user interfaces.


 Finally, they’ll give a sneak peak into their upcoming open source Android library Retrofit. Retrofit provides utilities for dependency injection (using Google Guice), simple and fast persistence, REST communication and dialog management.

Bob Lee

Bob Lee

Eric Burke

Eric Burke