What is Jetpack Compose?
Jetpack Compose is a modern UI toolkit for building native Android apps using Kotlin. It replaces XML-based UI design with a fully declarative approach, making UI creation more flexible and intuitive.
Why Use Jetpack Compose?
Declarative UI โ Describe what the UI should look like, and Compose handles the rest.
Less Code โ No need to write complex XML + View Binding.
Composable Functions โ Reusable UI components.
State Management โ Built-in support for
remember
andState
.Easier UI Updates โ UI refreshes automatically when data changes.
Interoperability โ Works with existing XML Views.
Performance โ Optimized for efficiency and faster rendering.
Example: Hello World in Jetpack Compose
@Composable
fun Greeting(name: String) {
Text(text = "Hello, $name!")
}
@Preview(showBackground = true)
@Composable
fun PreviewGreeting() {
Greeting(name = "Android")
}
๐ Explanation:
@Composable
โ Marks a function as a UI element.Text()
โ Displays text on the screen.@Preview
โ Shows a preview in Android Studio.
How to Set Up Jetpack Compose in Your Project
Enable Compose in build.gradle
android {
buildFeatures {
compose = true
}
composeOptions {
kotlinCompilerExtensionVersion = "1.5.3"
}
}
Add Dependencies
dependencies {
implementation("androidx.compose.ui:ui:1.5.3")
implementation("androidx.compose.material3:material3:1.1.2")
implementation("androidx.navigation:navigation-compose:2.7.3")
}
Jetpack Compose vs XML
Feature | Jetpack Compose | XML |
UI Approach | Declarative | Imperative |
Code Complexity | Less Code | More Code |
Reusability | High (Composable Functions) | Low |
Performance | Optimized | Less Optimized |
State Handling | Built-in | Requires extra logic |