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DevFest Uyo—Jetpack compose: Game changer for b...
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November 13, 2021
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DevFest Uyo—Jetpack compose: Game changer for building Modern Android UI
Love
November 13, 2021
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Transcript
Jetpack Compose: Game changer for building Modern Android UI Love
Sparus O’tudor Android Engineer, FrontendLabs Uyo
What is Jetpack Compose? Holla Jetty Packy😊
Jetpack Compose is a modern declarative UI Toolkit to simplify
and accelerate native Android UI development.
What ever happened to our famous XML?🤔
Different Languages 30+ thousands lines of code Cognitive Overhead Multiple
Files Deprecated Code Boilerplate Codes Multiple layers of inheritance Problems with the Traditional View System
UI logic and definition are completely Separate Uses XML Satic
Layout Definition Kotlin/Java Dynamic Logic & Behaviour Completely Separate Generates a lot of boilerplate codes
A Quick Look at Jetpack Compose
Jetpack Compose favours Composition over Inheritance is a Human has
a Composition Inheritance
Declarative UI Focus on the “WHAT” and not the “HOW”
Jetpack Compose is a function of State Anytime the “state“
changes the “compose UI” changes also.
@Preview @Composable setContent{} Compose Preview Material Theme
Composable Functions • Annotated with @Composable • @Composable informs the
compiler that the function is intended to convert data into UI. • Can accept parameters • Returns nothing
Composable Functions
“Composable functions can only be called in the context of
another compose function...”
setContent{} • The setContent block defines the activity's layout where
we call composable functions. • The content becomes the root view of the activity. • More like setContentView() in XML.
setContent{}
Material Theme • An implementation of Material Design. • Define
the applications theme with its respective colors, shapes, font, etc. • Can be customized. • Mostly the root element of the screen.
Material Theme
Modifier • An ordered, immutable collection of modifier elements that
decorate or add behavior to Compose UI elements. • Modifiers can be chained. • Their chaining order is important.
Modifier
Layouts Column Row Box Constraint Layout
Column
Row
Box
Say Goodbye to RecyclerView Welcome LazyRow and LazyColumn 🤩
Managing Lists In Compose • Compose makes it easy to
create lists. • These composables render only the elements that are visible on screen.
LazyRow A LazyRow is a horizontally scrolling list that only
composes and lays out the currently visible items.
LazyColumn A LazyColumn is a vertically scrolling list.
LazyVerticalGrid • A LazyColumn is a vertically scrolling grid. •
It accepts the number of grid items in one row or the minimum width of one item. • Unstable API.
LazyVerticalGrid
More Components • Button • Image • Icons, etc.
Ready to take a deep dive?
Additional Resources • Jetpack Compose Tutorial on developer.android • Jetpack
Compose basics Codelab • Under the hood of Jetpack Compose • Get started with Jetpack Compose • Jetpack Compose basics | Workshop
Questions?
Thank You!