Compose MP
- Kotlin course
- Expert
- Lesson 31/47
- 5 min
Learn the Compose Multiplatform concept.
What is Compose MP?
Compose Multiplatform is a library that lets you write declarative UI with Kotlin. The same code runs on Desktop, Web, Android and iOS.
Compose describes the UI with data-bound functions rather than imperative commands. A @Composable function redraws (recomposition) as its state changes. This builds a direct bridge between UI and logic. The composeMpInfo function in this lesson shows the concept with a simple model.
Compose MP targets
Compose MP supports many targets: Desktop (JVM), Web (Canvas or HTML), Android and iOS.
Each target has its own entry point: Window on Desktop, CanvasBasedWindow on Web, setContent on Android, ComposeUIViewController on iOS. Shared @Composable functions are reused on every target. This means a single UI code base with platform-specific entry points.
Practice Write composeMpInfo
Define fun composeMpInfo(): String. It should return "Compose MP". In main, write println(composeMpInfo()).
Starter code
// add the composeMpInfo function
fun main() {
// print the Compose MP info
}Sample solution
fun composeMpInfo(): String = "Compose MP"
fun main() {
println(composeMpInfo())
}Expected output
Compose MP
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Which paradigm does Compose MP use?
Compose describes UI with declarations.- Declarative Correct answer
- Imperative
- Pure functional
- Procedural
Explanation: Compose builds UI with the declarative paradigm.
2 Complete the import line
import androidx.compose.____import androidx.compose.runtimeExplanation: The runtime module holds Compose state and remember.
3 Match the Compose MP parts
| Term | Meaning |
|---|---|
Desktop |
JVM target |
Web |
Canvas/HTML |
Android |
Android target |
iOS |
iOS target |