Created
January 3, 2024 16:33
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Shimmer Effect in Jetpack Compose
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| import android.content.res.Configuration.UI_MODE_NIGHT_YES | |
| import androidx.compose.animation.core.* | |
| import androidx.compose.foundation.isSystemInDarkTheme | |
| import androidx.compose.foundation.layout.* | |
| import androidx.compose.foundation.lazy.LazyColumn | |
| import androidx.compose.foundation.shape.RoundedCornerShape | |
| import androidx.compose.material.Surface | |
| import androidx.compose.runtime.Composable | |
| import androidx.compose.runtime.getValue | |
| import androidx.compose.ui.Modifier | |
| import androidx.compose.ui.draw.alpha | |
| import androidx.compose.ui.graphics.Color | |
| import androidx.compose.ui.tooling.preview.Preview | |
| import com.example.borutoapp.ui.theme.* | |
| @Composable | |
| fun ShimmerEffect() { | |
| LazyColumn( | |
| contentPadding = PaddingValues(all = SMALL_PADDING), | |
| verticalArrangement = Arrangement.spacedBy(SMALL_PADDING) | |
| ){ | |
| items(count = 2){ | |
| AnimatedShimmerItem() | |
| } | |
| } | |
| } | |
| @Composable | |
| fun AnimatedShimmerItem() { | |
| val transition = rememberInfiniteTransition() | |
| val alphaAnim by transition.animateFloat( | |
| initialValue = 1f, | |
| targetValue = 0f, | |
| animationSpec = infiniteRepeatable( | |
| animation = tween( | |
| durationMillis = 500, | |
| easing = FastOutLinearInEasing | |
| ), | |
| repeatMode = RepeatMode.Reverse | |
| )) | |
| ShimmerItem(alpha = alphaAnim) | |
| } | |
| @Composable | |
| fun ShimmerItem(alpha: Float) { | |
| Surface( | |
| modifier = Modifier | |
| .fillMaxWidth() | |
| .height(HERO_ITEM_HEIGHT), | |
| color = if (isSystemInDarkTheme()) | |
| Color.Black else ShimmerLightGray, | |
| shape = RoundedCornerShape(size = LARGE_PADDING) | |
| ) { | |
| Column( | |
| modifier = Modifier | |
| .padding(all = MEDIUM_PADDING), | |
| verticalArrangement = Arrangement.Bottom | |
| ) { | |
| Surface( | |
| modifier = Modifier | |
| .alpha(alpha = alpha) | |
| .fillMaxWidth(1.5f) | |
| .height(IMAGE_ICON_HEIGHT), | |
| color = if (isSystemInDarkTheme()) | |
| ShimmerDarkGray else ShimmerMediumGray, | |
| shape = RoundedCornerShape(size = SMALL_PADDING) | |
| ) {} | |
| Spacer(modifier = Modifier.padding(all = SMALL_PADDING)) | |
| Surface( | |
| modifier = Modifier | |
| .alpha(alpha = alpha) | |
| .fillMaxWidth(0.5f) | |
| .height(NAME_PLACEHOLDER_HEIGHT), | |
| color = if (isSystemInDarkTheme()) | |
| ShimmerDarkGray else ShimmerMediumGray, | |
| shape = RoundedCornerShape(size = SMALL_PADDING) | |
| ) {} | |
| Spacer(modifier = Modifier.padding(all = SMALL_PADDING)) | |
| repeat(3) { | |
| Surface( | |
| modifier = Modifier | |
| .fillMaxWidth() | |
| .alpha(alpha = alpha) | |
| .height(ABOUT_PLACEHOLDER_HEIGHT), | |
| color = if (isSystemInDarkTheme()) | |
| ShimmerDarkGray else ShimmerMediumGray, | |
| shape = RoundedCornerShape(size = SMALL_PADDING) | |
| ) {} | |
| Spacer(modifier = Modifier.padding(all = EXTRA_SMALL_PADDING)) | |
| } | |
| Row(modifier = Modifier.fillMaxWidth()) { | |
| repeat(5){ | |
| Surface( | |
| modifier = Modifier | |
| .alpha(alpha = alpha) | |
| .size(RATING_PLACEHOLDER_HEIGHT), | |
| color = if (isSystemInDarkTheme()) | |
| ShimmerDarkGray else ShimmerMediumGray, | |
| shape = RoundedCornerShape(size = SMALL_PADDING) | |
| ) {} | |
| Spacer(modifier = Modifier.padding(all = SMALL_PADDING)) | |
| } | |
| } | |
| } | |
| } | |
| } | |
| @Composable | |
| @Preview | |
| fun ShimmerItemPreview() { | |
| AnimatedShimmerItem() | |
| } | |
| @Composable | |
| @Preview(uiMode = UI_MODE_NIGHT_YES) | |
| fun ShimmerItemDarkPreview() { | |
| AnimatedShimmerItem() | |
| } |
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