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LogActivity.kt lets the user to create a new weight log. It shows all the weight logs with their calculated BMIs. MainActivity.kt contains the main screen. The project contains the following main files: Set up your profile and add a few weight logs. #Viewpic for android android
Once downloaded, open the begin project, from the materials, by selecting Open an existing Android Studio project from the welcome screen.īuild and run BMICalc and become familiar with it:
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If you haven’t already, click here to download that version.
Since the canary versions may change from the time of writing the tutorial, make sure you have the latest installed. You’ll find BMICalc already configured using the appropriate versions.įor the tutorial, you’ll use the canary version of Android Studio 4.0. Also, you need to use Android Studio 3.6 Canary 11+ or newer because older versions of Android Studio won’t open a project that uses the Android Gradle Plugin version 3.6.0-alpha11 or higher. This version of the Android Gradle Plugin requires Gradle 5.6.1 or higher.
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To use View Binding, you need to upgrade to the Android Gradle Plugin version 3.6.0-alpha11 or later. It also shows a color indicating if the user is either healthy or overweight. By providing height and weight, BMICalc lets the user calculate his or her Body Mass Index (BMI). Throughout this tutorial, you’ll work with an app called BMICalc. To get started, download the begin and end projects by clicking the Download Materials button at the top or bottom of the tutorial. You’ll see an example later in the sample project. So, you should use it wherever you can.īut, it’s not the best choice for one specific case.
View Binding’s impact on build speed is almost negligible.Īccording to Google, this new approach has the best of all the worlds. It should take all the best parts of each of the other approaches while avoiding their flaws. Google designed it to avoid the performance issues of Data Binding and to provide compile-time safety.
View Binding: This new approach to finding views has an elegant interface, like Data Binding. Check out the official documentation, if you want to try it out. While it doesn’t impact the build speed, it also doesn’t provide compile-time safety. Kotlin synthetic properties: This is a simple and easy-to-use API. You can check this approach in the official documentation. But, it lowers the speed of your build because of the annotation processing. This provides an elegant interface as well as compile-time safety. Data Binding: This approach generates a class for you to use. Jake Wharton, the creator of this library, is deprecating it in favor of View Binding. You can check out this approach at the following link.Īdditionally, ButterKnife’s development is coming to an end. It also impacts the build speed because it runs an annotation processor to generate code. Moreover, if you bind the wrong type, you’ll get an exception in the runtime. While this approach provides an elegant interface, it doesn’t give you compile-time safety, as you can bind any view ID to any View type. Similar to Dagger2, or Room, the compiler then generates the required code, to bind these views. ButterKnife: This is an annotation-based approach, where you can annotate all the Views you want to bind. Using such a View, without adding null checks can lead to a NullPointerException.Ī good thing about findViewById() is that it doesn’t have any impact on build speed, because it works in the runtime. Using findViewById() also isn’t null safe since this method can return null if the referenced view is not available for use at the time of access. That means that you can return any concrete type without having to cast the result explicitly. findViewById() now uses generic typing, and instead of returning a plain View object, it returns a type that extends from View. 
In Android 8, API 26, Google made a change to the findViewById() signature. As a result, it didn’t provide compile-time safety. In the past, this method returned a View object, and you had to explicitly cast it to a specific type.
findViewById: It’s verbose and thus not elegant. So, what are all the approaches to working with Views? Well, I’m glad you asked! Here’s a quick breakdown of the various approaches as well as some of their pros and cons. If you’re beginning with Android, check out Getting Started and other Android tutorials. If you’re unfamiliar with the language have a look at this tutorial. #Viewpic for android for android
Note: This tutorial assumes you have experience with developing for Android in Kotlin.
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