The Jetpack Compose Guideline Blog – 1, Every application is supported by a UI framework. They have a major impact on how apps are designed and the way they perform. They work in various ways, however, they can be classified into two groups: declarative and imperative.
Imperative UI concentrates upon the “how” (How do I accomplish something) instead of what “what” (What is the goal I would like to achieve).XML Layouts in Android is an excellent illustration of this paradigm. We create Widgets as well as Components to be used with users. The declarative user interface is a revolutionary technology that allows developers to create user interfaces using the information received. Unlike Imperative, it focuses more on “what”. Flutter React native SwiftUI as well as Jetpack compose, are all examples of declarative UI frameworks.
The Jetpack Compose Guideline Blog – 1
Table of Contents
It has now become an absolute requirement to know about Jetpack Compose. The goal of the Medium course is to provide all the essential information starting with understanding the reasons Jetpack composite is required and how to use it.
What is Jetpack Compose?
Jetpack Compose is an Android-specific toolkit for creating the native UI.Compose is “to connect and bring together to create,” hence Jetpack Compose is used to compose or create a complete UI using small, usable pieces that are composable.
It streamlines and speeds up UI creation on Android making your apps come to life with fewer lines of code, powerful tools and easy Kotlin APIs. It helps build Android UI faster and easier. When we were developing Compose we collaborated with a variety of partners who have experienced these benefits in person and shared their experiences with us.
What is the difference between XML Layout and Where did the Need come from ?
The underlying principle is that of Modern paradigms, languages and tools The users expect apps to be as sophisticated like their smartphones, able of providing an immersive and enjoyable experience. In order to keep up with the demands of their users, Android developers require and require advanced paradigms, languages and tools.However In Jetpack compose, there is only one language is used for everything which is Kotlin. Kotlin’s classes and files are utilized to build the business logic and the user interface.That means that the modern language has capabilities, paradigms such as functional programming, compactness and accessibility
— Theming Design systems like Material Design weren’t around ten years ago. The user interfaces were extremely primitive, with almost any thought given to following designs or the user experience principle.Themes were created in manifest files prior to Jetpack compose. The various design characteristics were also listed in XML files within the resource folder.Jetpack compose comes with the Material design theme that was already configured. You can easily alter the theme to meet your requirements. Within the MaterialTheme modular design, it provides features like fonts, shapes and colors.
— The management of the state: In the imperative UI the management of state was not as simple than in the declarative UI.Because it was constructed as an array of widgets, it became more susceptible to mistakes as the tree grew. You must navigate the tree of widgets in order to locate the right widget to reflect changes to the data.However since we concentrate more on data using Jetpack compose, updating is much easier. The framework scans for elements that require to be changed before recomposing them so that they create the desired effect. This means that state management is enhanced.
– Effective and efficient because Jetpack compose was written using Kotlin and Kotlin, it can access the extensive features of the language. Structures for control can be utilized to alter the drawing interface of the user. In comparison to interfaces created using XML layouts it can make yours more dynamic.
What is the reason you use ?
Writing less code can have an effect on overall development process. The code written by Compose is easy and simple to maintain.
Compose allows you to build tiny, stateless components that aren’t bound to any specific component or process. This makes them easy to use and test. The state is explicitly declared in Compose and is passed on to composable. The state will be wrapped and separated because of having one base of truth. As the app’s state changes, the UI is automatically updated.
Previews in Android Studio have been a huge time saver. The ability to create several previews is also saving us time.
– It speeds up development .It takes away the boilerplate of findViewById as well as ViewBinding references.Google asserts that Compose is time-saving and offers better performance than conventional view system. To test this, they have tested with a couple of apps.
Compose lets you create stunning applications with direct access to Android platform APIs, as well as the integrated features of Material Design, Dark theme animations, and much more. Compose can be integrated with existing code, and the views already available in Android.Jetpack Compose was designed to integrate with the well-established viewpoint-based UI approach.There is two primary ways to incorporate Compose into an underlying view-based UI:
- Adding Compose elements into your existing UI
- Add views-based UI elements to your functionalities that you can compose.
-Compose was designed using integration as a primary goal. It can integrate with all different Jetpack library.
Apart from Jetpack libraries, it’s also very easy to integrate with other large libraries, as well as modern ones, like:
- Glide and Coil to load images
- Dagger/Hilt for dependency injection
- Kotlin Coroutines , Flow to run an asynchronous program
- Retrofit and Ktor to allow network integration
- Lottie used for animated videos.
Composable functions are regular Kotlin functions that is annotated with @Composable This allows your function to invoke different composable functions inside it. Compose methods should begin with capital letter.
If you wish to view your design without compilation, it’ll suffice to add an @Preview Annotation’s.
Composable functions convert data into user interface elements. The function does not return any data. Compose functions which emit UI don’t need any thing, since they simply describe the desired state of the screen instead of building UI widgets.
Jetpack Compose offers a promising and effective modern UI toolkit that you should pay close attention to.Composable functions are similar to standard Kotlin functions that the software you use to write them and modify them will be a seamless fit in the Android creation toolset.Using the declarative UI can be more adaptable, and easier to implement , and will speed up development.
The next article we’ll look at an in-depth look into what we call the Jetpack Compose component. Let’s explore the application a bit more.