Kotlin Jetpack Tutorial
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Kotlin Jetpack Compose is a modern UI toolkit for Android that enables more declarative UI coding, replacing traditional XML layouts. It uses a composite design pattern to manage hierarchical data and provides features like composable functions, layout arrangements, material design support, and easy-to-implement animations. Key components include various layout types (row, column, box) and lazy loading options for lists, enhancing both the development process and user experience.
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Kotlin Jetpack Tutorial
- 2. What’s in it for you ? What is Kotlin Jetpack Compose? Why Jetpack compose? How does Compose work Composable function Layouts Material design List and animation
- 3. What is Kotlin Jetpack compose? The Kotlin Jetpack compose is a modern User interface development toolkit for building Android UI. With the help of Jetpack compose, we can make more declarative UI code with few lines of code. Before Jetpack Compose, XML layouts were used to make a native User interface.
- 4. Why Jetpack compose? Jetpack Compose Accelerates development Independent Intuitive Powerful and Feature loaded
- 5. How does compose work? The jetpack compose works on a composite design pattern. This pattern is used while dealing with hierarchical data like a parent-child relationship. In compose, every view can contain one or more child views within it, and the child views can further have sub-child views.
- 6. Composable function A composable function is just like any other normal function of Kotlin but the only difference is it is annotated by the @Composable sign. It helps in transforming the data to User interface hierarchy. All the functions with the @Compsoable sign indicate that this function is the compose function.
- 7. Composable function @Composable fun Message(name: String) { Text(text = "Hey $name!") } @Preview @Composable fun PreviewMessage() { Message(“Rahul") } Composable annotation is used to make the function composable function The element text is also composable which comes from compose library The @Preview annotation helps us to see how our UI is going to look like
- 8. Layout Layouts allows us to arrange the components in such a way so that they don’t overlap each other. It allows to arrange the components in a proper manner. Layout is a composable function that allows us to arrange elements in • Row • Column • Box
- 9. Layout @Composable fun Example(){ Row{ Text(text = "Hello ") Text(text = " there ") Text(text = “mate") } } @Composable fun Example(){ Column{ Text(text = "Hello ") Text(text = " there ") Text(text = “mate") } } The Column function lets you arrange elements vertically The Row function lets you arrange elements horizontally
- 10. Box @Composable fun Example(){ Box{ Text(text = "Hello", modifier = Modifier.align(Alignment.TopCenter)) Text(text = “Rahul", modifier = Modifier.align(Alignment.BottomCenter)) } } In Box layout, the children are stacked over each other. So we have to align them to put them in different positions
- 12. Material design As the name suggests, it helps to improve the appearance using the Material design styling. There are three pillars of material design: • Color • Typography • Shape
- 13. Material design Shape Material design allows us to define shape for small, medium and large components as well Typography Typography is used to style or define a type system Color By using values from wrapped theme, you can easily color wherever it is needed Material design
- 14. List and animations The List and animations are one of the most important concepts for building an app. Lazy composables are used when we wish to display items of unknown length. These components include LazyRow and LazyColumn.
- 15. List and animations Here we are adding a single item Here we are adding a multiple items LazyColumn { item { Text(text = "First element") } items(7) { index -> Text(text = “Element: $index") } } LazyRow makes a horizontal scrolling list LazyColumn makes a vertical scrolling list Here we are adding a multiple items
- 16. List and animations The Animations are very important for smooth and attractive user experience. There are various APIs that give you control and help with the animation. • AnimationVisibility • Animation • Crossfade • rememberInfiniteTransition • updateTransition