Explore efficient messaging systems for Android apps in this 42-minute conference talk from the Big Android BBQ 2015. Dive into the world of Google Cloud Messaging to learn how to build smart communication channels between your app, users, and devices. Discover techniques for fast, battery-efficient, and bandwidth-conscious messaging that target the right devices. Gain insights on implementing two-way communication, allowing users to interact with your app seamlessly. Led by Laurence Moroney, a Google Developer Advocate, this talk offers valuable knowledge for developers looking to enhance their app's messaging capabilities and user engagement.