Aquileo | Create Bounce Animation on Touch in Android Jetpack Compose

In this article, we will take a look at how to create a bounce animation when the user taps anything, further it can be extended as per the use of the App.

Prerequisites:

Basic knowledge of Kotlin
Basic Knowledge of Jetpack Compose

Step by Step Implementation

Step 1: Create a New Project

To create a new project in the Android Studio, please refer to How to Create a new Project in Android Studio with Jetpack Compose.

Note: Select Kotlin as the programming language.

Step 2: Working with the MainActivity.kt

Create an enum class that stores the states (Released / Pressed).

enum class BounceState { Pressed, Released }

MainActivity.kt:

Kotlin

package com.geeksforgeeks.demo

import android.os.Bundle
import androidx.activity.*
import androidx.activity.compose.setContent
import androidx.compose.animation.core.*
import androidx.compose.foundation.Image
import androidx.compose.foundation.gestures.detectTapGestures
import androidx.compose.foundation.layout.*
import androidx.compose.runtime.*
import androidx.compose.ui.*
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.geeksforgeeks.demo.ui.theme.DemoTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            DemoTheme(dynamicColor = false, darkTheme = false) {
                Bounce()
            }
        }
    }
}

enum class BounceState { Pressed, Released }

@Preview(showBackground = true)
@Composable
fun Bounce() {
    var currentState: BounceState by remember { mutableStateOf(BounceState.Released) }
    val transition = updateTransition(targetState = currentState, label = "animation")
    
    val scale: Float by transition.animateFloat(
        transitionSpec = { spring(stiffness = 900f) }, label = ""
    ) { state ->
        if (state == BounceState.Pressed) {
            // reduce size by 20% on press
            0.8f
        } else {
            // return to original on release
            1f
        }
    }

    // create ui for image
    Box(
        Modifier.fillMaxSize(),
        contentAlignment = Alignment.Center
    ) {
        Column(
            modifier = Modifier
            .pointerInput(Unit) {
                detectTapGestures(onPress = {

                    // Set the currentState to Pressed
                    // to trigger Pressed animation
                    currentState = BounceState.Pressed

                    // Waits for the tap to release
                    // before returning the call
                    tryAwaitRelease()

                    // Set the currentState to Release
                    // to trigger Release animation
                    currentState = BounceState.Released
                })
            }
        ) {
            Image(
                painter = painterResource(id = R.drawable.gfg_logo),
                contentDescription = "gfg",
                modifier = Modifier
                    .graphicsLayer {
                        scaleX = scale
                        scaleY = scale
                    }
                    .size(200.dp)
            )
        }
    }
}

Create Bounce Animation on Touch in Android Jetpack Compose

Prerequisites:

Step by Step Implementation

Step 1: Create a New Project

Step 2: Working with the MainActivity.kt

Output:

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