What is @Preview in Jetpack Compose (Kotlin, Android)?

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Android Kotlin (app with Jetpack Compose) | Android Studio

What is @Preview in Jetpack Compose (Kotlin, Android)?

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обновлено: 12 July 2026

An important advantage of Jetpack Compose is the &Preview annotation.
The @Preview annotation allows you to show what the screen with buttons and text inside Android Studio will look like without starting the project on the emulator, without starting the project on the phone.

How to use @Preview ?

We need to add an annotation @Preview for our @Composable function.
Importantly! @Preview can only be used for methods without parameters.
Example:

Kotlin

@Composable
fun ShowMyText() {
     Text(
          text = "Hello Android!"
     )
}

@Preview
@Composable
fun MyPreview1() {
     ShowMyText()
}

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