Button composable in Android Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Button composable in Jetpack Compose?

A Button composable is a clickable UI element in Jetpack Compose that triggers an action when pressed. It is used to create buttons in Android apps with declarative UI.

beginner

How do you create a simple Button with text "Click me" in Jetpack Compose?

Use the Button composable with a lambda for onClick and a Text composable inside it: Button(onClick = { /* action */ }) { Text("Click me") }

beginner

What parameter must you always provide to a Button composable?

You must always provide the onClick parameter, which is a lambda function that defines what happens when the button is pressed.

intermediate

How can you customize the colors of a Button in Jetpack Compose?

You can customize colors by using the colors parameter with ButtonDefaults.buttonColors(), for example: Button( onClick = { }, colors = ButtonDefaults.buttonColors(containerColor = Color.Red) ) { Text("Red Button") }

intermediate

What is the difference between Button and TextButton in Jetpack Compose?

Button has a background and elevation by default, making it look like a raised button. TextButton is a button without background or elevation, appearing as just text that is clickable.

Which parameter is required when creating a Button composable?

A shape

B text

C color

D onClick

The onClick parameter defines the action when the button is pressed and is required.

How do you add text inside a Button composable?

A Use the Text composable inside the Button's lambda

B Set the text parameter of Button

C Use a string directly as Button's argument

D Use a TextView inside Button

Button composable takes a lambda where you can place child composables like Text.

What does ButtonDefaults.buttonColors() help you do?

A Set button size

B Add icons to button

C Customize button colors

D Change button font

ButtonDefaults.buttonColors() provides color customization options for buttons.

Which composable looks like a flat text without background by default?

A TextButton

B Button

C OutlinedButton

D IconButton

TextButton is a button styled as flat text without background or elevation.

What happens if you omit the onClick parameter in a Button composable?

A Button shows default action

B Compilation error

C Button works but does nothing

D Button is disabled automatically

onClick is a required parameter; omitting it causes a compilation error.

Explain how to create a basic Button composable with a click action and text label.

Think about how you tell the button what to do and what it shows.

Describe ways to customize the appearance of a Button in Jetpack Compose.

Colors and styles can be changed using built-in helpers.