FoodOrder: A model class for ordered food with three variables: foodName, foodPrice and sideOrder.FoodListAdapter: An adapter class for the RecyclerView of different food orders containing the order’s name, price in INR and the side order.Once you’ve downloaded the materials, open the starter project in Android Studio 3.1.3 or later and get familiar with its content. Getting StartedĪs a first step, download the materials for this tutorial by clicking the Download materials button at the top or bottom of the tutorial. Other prerequisites include basic knowledge of threads and multi-threading. If you are completely new to Android development, read through our Beginner Android Series. Prerequisite: This tutorial assumes you are already familiar with the basics of Android development. How HandlerThread compares with other tools like AsyncTask, Service and IntentService.How to create your own HandlerThread implementation to update the UI.The role of HandlerThread in the framework.The core components of the HaMeR framework: Handler, Message and Runnable, and other two relevant classes: Looper and MessageQueue.The app can also attach additional side orders to a main order. McWenderlich, a live-updating food-ordering app for a restaurant, will process the incoming orders by converting prices from USD to Indian Rupees (INR). In this tutorial, you’ll develop a handy food-ordering app that needs concurrent programming to execute its tasks. In Android, you can do this in many ways using different tools. Experience in other environments (Swing, AWT and others) teaches that the best approach is the one that translates every operation on the UI into a message to a single consumer that runs on the main thread. It’s very important to know that all the interactions with UI components in an Android app happen on a single thread that we call the main thread - or, simply, the UI thread. For these reasons, concurrent programming must now be a part of the skillset of every developer. Users must be able to interact with the app in a smooth way without falling into flickering or a slow UI. This is even more important in resource-constrained devices like smartphones. Responsiveness is one of the most valuable features of any app. You will learn how to use HandlerThread to receive messages from a Runnable in an Activity and pass them back to a UI handler to update the UI.
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