![]() Specialized Views often expose a specific set of event listeners that you use to manage interactive events.Īs you know, with great power comes great responsibility, and the Android View component is definitely powerful. Your users want to interact with the UI by clicking, dragging or typing into it.įortunately, Views also support this type of interaction and events. It occupies a rectangular area on the screen where it draws the specific UI component, like a button or a text field.īut user interfaces aren’t designed to be static - at least, most of them aren’t. ![]() ViewĪs mentioned before, a View in the Android UI toolkit, represents the basic building block for UI components. So it makes sense to begin by looking at how you implement and use the View class. The most important thing to notice here is your View objects are responsible for the look of your UI. If you’re familiar with computer science structures, you’ll recognize ViewGroups are like nodes of the tree structure, where each View is a leaf. ViewGroups can contain other ViewGroups and Views. They display individual UI components like buttons and text boxes.Īs you can see in the image, you define each screen in Android as a tree of ViewGroup and View objects. On the other hand, widgets are represented by View objects. They are containers controlling the position and behavior of their children on the screen. In code, layouts are represented by ViewGroup objects. In Android, you build your UI as a tree-based hierarchy of layouts and widgets. You’ll see how Compose approaches each of the concepts of the current Android UI toolkit, how it improves upon them, and why it’s the next evolutionary step in Android development. Or Compose, for short.Īfter that, you’ll learn about Compose - the awesome new UI toolkit for Android, which is making all the Android kids super hyped! :] You’ll learn the reasons behind these concepts, their drawbacks, and their influence on Jetpack Compose. You’ll review the basics of showing the layout on screen, how to make custom views, and the technical principles behind it. In this chapter, you’ll learn the design concepts behind the existing Android UI toolkit. ![]() When you look at the big picture, it’s easy to understand why UI design is so important: It’s one of the most common reason products succeed or fail. You could say it’s an ever-evolving relationship between a user and the system they interact with. The user interface (UI) is the embodiment of your mobile app. Animating Properties Using Composeġ2.4 Using Transitions to Animate JoinButtonġ3.1 Introducing the Chat Screen and the Trending Viewġ3.2 Using Composables With the View Framework Using ConstraintSets in Composablesĩ.5 Advanced Features of ConstraintLayout Section III: Building Complex Apps With Jetpack Compose Section 3: 5 chapters Show chapters Hide chapters Applying Material Design to ComposeĨ.4 Adding an Entry Point to Save Note ScreenĨ.6 Opening the Save Note Screen in Editing ModeĨ.9 Using Material Design Composables in the Notes Screen Section II: Composing User Interfaces Section 2: 4 chapters Show chapters Hide chaptersĦ.6 Centering Text & Checkbox ComposablesĦ.8 Taking Advantage of the Modifier Parameterħ.2 Handling State With Android UI Toolkitħ.3 Handling State With Unidirectional Data Flow
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