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Composable Functions & setContent – Jetpack Compose Course #3
Video by Master Coding via YouTube
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πππ What Youβll Learn in This Video ππ
ππ Composable Functions in Jetpack Compose
A Composable function is a function that defines part of a UI in Jetpack Compose. It is annotated with @Composable and can be used to create and compose UI elements declaratively.
ππ Key Features of Composable Functions
Stateless UI: They don’t hold or modify state directly.
Composable: They can call other @Composable functions.
Reusable: They allow modular UI building.
Lightweight: No need for XML layouts; everything is defined in Kotlin.
ππ @Preview Annotation
The @Preview annotation allows you to preview a Composable function inside Android Studio without running the app on an emulator or a physical device.
ππ setContent in Jetpack Compose
setContent {} is used in an Activity or Fragment to define the entire UI using Compose.
π setContent {} replaces setContentView(R.layout.activity_main).
π Inside setContent {}, you call Composable functions to define the UI.
π@Composable Defines a UI function
π@Preview Shows a preview in Android Studio
π setContent Sets the UI inside an Activity or Fragment
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