Five Cool Animation in Jetpack Compose
1. Bouncing Ball Animation
This animation simulates a ball moving up and down, bouncing back and forth within a certain area. It uses an infinite animation loop where the ball alternates between two positions (top and bottom). The animation provides a visual effect of the ball bouncing off invisible surfaces, making the movement smooth and continuous.
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@Composable
fun BouncingBallAnimation() {
val ballPosition = remember { Animatable(0f) }
val ballSize = 50.dp
LaunchedEffect(Unit) {
ballPosition.animateTo(
targetValue = 600f,
animationSpec = infiniteRepeatable(
animation = tween(1000, easing = LinearEasing),
repeatMode = RepeatMode.Reverse
)
)
}
Canvas(modifier = Modifier.fillMaxSize()) {
drawCircle(
color = Color.Red,
radius = ballSize.toPx() / 2,
center = Offset(size.width / 2, ballPosition.value)
)
}
}2. Fade-in Text Animation
The fade-in animation gradually changes the opacity (transparency) of a text element, making it slowly appear on the screen. The animation starts with the text being fully transparent and then fades in over time until it becomes fully visible. This effect is often used to draw attention to important content that appears on the screen.
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@Composable
fun FadeInTextAnimation() {
var alpha by remember { mutableFloatStateOf(0f) }
LaunchedEffect(Unit) {
alpha = 1f
}
val alphaAnim by animateFloatAsState(
targetValue = alpha,
animationSpec = tween(durationMillis = 2000), label = ""
)
Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
Text(
text = "Hello, Compose!",
fontSize = 32.sp,
color = Color.Black.copy(alpha = alphaAnim),
fontWeight = FontWeight.Bold
)
}
}3. Expandable Cards Animation
This animation expands or collapses a card when clicked. Initially, the card is displayed in a collapsed state. When the user taps on the card, it smoothly expands to show more content. When tapped again, it collapses back to its original size. This is a popular effect for showing/hiding additional information or details dynamically.
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@Composable
fun ExpandableCardAnimation() {
var expanded by remember { mutableStateOf(false) }
val cardHeight by animateDpAsState(
targetValue = if (expanded) 200.dp else 100.dp, label = ""
)
Card(
modifier = Modifier
.padding(16.dp)
.height(cardHeight)
.fillMaxWidth()
.clickable { expanded = !expanded },
shape = RoundedCornerShape(8.dp)
) {
Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
Text(text = if (expanded) "Expanded" else "Collapsed")
}
}
}4. Button Ripple Effect
A ripple effect is a visual feedback that simulates a ripple spreading outwards from the point where a user touches or clicks a button. It is a common effect in Material Design that gives users instant feedback when they interact with a button. This makes the app feel more responsive and visually engaging.
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@Composable
fun RippleEffectButton() {
Box(
modifier = Modifier
.fillMaxSize(),
contentAlignment = Alignment.Center
) {
Surface(
modifier = Modifier
.wrapContentSize()
.clickable { /* Clicked */ },
shape = MaterialTheme.shapes.medium,
color = MaterialTheme.colorScheme.primary,
shadowElevation = 8.dp
) {
Text(
text = "Ripple Button",
modifier = Modifier
.padding(16.dp),
color = MaterialTheme.colorScheme.onPrimary
)
}
}
}5. Swipe to Delete with Animation
This animation allows users to swipe an item horizontally (typically to the right) to trigger a delete action. As the user swipes, the item gradually disappears from the screen, giving the feeling that it’s being "deleted." This gesture-based interaction is commonly used in list-based apps to allow users to remove items with a simple swipe motion.
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@Composable
fun SwipeToDeleteAnimation() {
var isDeleted by remember { mutableStateOf(false) }
if (!isDeleted) {
Box(
modifier = Modifier
.fillMaxWidth()
.background(Color.LightGray)
.height(80.dp)
.pointerInput(Unit) {
detectHorizontalDragGestures { _, dragAmount ->
if (dragAmount > 300) {
isDeleted = true
}
}
},
contentAlignment = Alignment.Center
) {
BasicText(text = "Swipe to delete")
}
}
}Note:
These animations are often used to improve user experience by making the interface feel more intuitive, interactive, and smooth. They guide user interactions and make the app feel more polished and engaging.
MainActivity
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package com.example.jetpackcomposeskill
import ...
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
enableEdgeToEdge()
setContent {
JetpackComposeSkillTheme {
AnimationDemo()
}
}
}
}
}
AnimationDemo
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package com.example.jetpackcomposeskill
import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.LinearEasing
import androidx.compose.animation.core.RepeatMode
import androidx.compose.foundation.Canvas
import androidx.compose.ui.unit.dp
import androidx.compose.ui.geometry.Offset
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material3.Text
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.sp
import androidx.compose.animation.core.animateDpAsState
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.infiniteRepeatable
import androidx.compose.animation.core.tween
import androidx.compose.foundation.clickable
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material3.Card
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.detectHorizontalDragGestures
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.text.BasicText
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.input.pointer.pointerInput
import androidx.navigation.NavController
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.setValue
@Composable
fun AnimationDemo() {
val nav = rememberNavController()
NavHost(navController = nav, startDestination = "animDemo") {
composable("animDemo"){
AnimationDemo(navController = nav)
}
composable("bounce"){
BouncingBallAnimation()
}
composable("fade"){
FadeInTextAnimation()
}
composable("expand") {
ExpandableCardAnimation()
}
composable("ripple"){
RippleEffectButton()
}
composable("swipe"){
SwipeToDeleteAnimation()
}
}
}
@Composable
fun AnimationDemo(navController: NavController) {
Column(Modifier.fillMaxSize()){
Text("Bounce",
Modifier.padding(20.dp).clickable{navController.navigate("bounce")}, fontSize = 32.sp)
Text("Fade",
Modifier.padding(20.dp).clickable{navController.navigate("fade")}, fontSize = 32.sp)
Text("Expand",
Modifier.padding(20.dp).clickable{navController.navigate("expand")}, fontSize = 32.sp)
Text("Ripple",
Modifier.padding(20.dp).clickable{navController.navigate("ripple")}, fontSize = 32.sp)
Spacer(modifier = Modifier.width(20.dp))
Text("Swipe Me!",
Modifier.padding(20.dp).clickable{navController.navigate("swipe")}, fontSize = 32.sp)
}
}
@Composable
fun BouncingBallAnimation() {
val ballPosition = remember { Animatable(0f) }
val ballSize = 50.dp
LaunchedEffect(Unit) {
ballPosition.animateTo(
targetValue = 600f,
animationSpec = infiniteRepeatable(
animation = tween(1000, easing = LinearEasing),
repeatMode = RepeatMode.Reverse
)
)
}
Canvas(modifier = Modifier.fillMaxSize()) {
drawCircle(
color = Color.Red,
radius = ballSize.toPx() / 2,
center = Offset(size.width / 2, ballPosition.value)
)
}
}
@Composable
fun FadeInTextAnimation() {
var alpha by remember { mutableFloatStateOf(0f) }
LaunchedEffect(Unit) {
alpha = 1f
}
val alphaAnim by animateFloatAsState(
targetValue = alpha,
animationSpec = tween(durationMillis = 2000), label = ""
)
Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
Text(
text = "Hello, Compose!",
fontSize = 32.sp,
color = Color.Black.copy(alpha = alphaAnim),
fontWeight = FontWeight.Bold
)
}
}
@Composable
fun ExpandableCardAnimation() {
var expanded by remember { mutableStateOf(false) }
val cardHeight by animateDpAsState(
targetValue = if (expanded) 200.dp else 100.dp, label = ""
)
Card(
modifier = Modifier
.padding(16.dp)
.height(cardHeight)
.fillMaxWidth()
.clickable { expanded = !expanded },
shape = RoundedCornerShape(8.dp),
// backgroundColor = Color.LightGray
) {
Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
Text(text = if (expanded) "Expanded" else "Collapsed")
}
}
}
@Composable
fun RippleEffectButton() {
Box(
modifier = Modifier
.fillMaxSize(),
contentAlignment = Alignment.Center
) {
Surface(
modifier = Modifier
.wrapContentSize()
.clickable { /* Clicked */ },
shape = MaterialTheme.shapes.medium,
color = MaterialTheme.colorScheme.primary,
shadowElevation = 8.dp
) {
Text(
text = "Ripple Button",
modifier = Modifier
.padding(16.dp),
color = MaterialTheme.colorScheme.onPrimary
)
}
}
}
@Composable
fun SwipeToDeleteAnimation() {
var isDeleted by remember { mutableStateOf(false) }
if (!isDeleted) {
Box(
modifier = Modifier
.fillMaxWidth()
.background(Color.LightGray)
.height(80.dp)
.pointerInput(Unit) {
detectHorizontalDragGestures { _, dragAmount ->
if (dragAmount > 300) {
isDeleted = true
}
}
},
contentAlignment = Alignment.Center
) {
BasicText(text = "Swipe to delete")
}
}
}