Android compose crane

Posted 2021-09-01 aikongmeng

https://github.com/android/compose-samples/tree/main/Crane

A Compose implementation of the Crane Material study, a travel app that uses Material Design components and Material Theming to create a personalized, on-brand experience.

• Medium complexity
• Draggable UI elements
• Android Views inside Compose
• UI state handling
• UI Tests

采用了 kt gradle 脚本, 在Dependencies.kt 定义了要使用类库
如

...
object Coil {
        const val coilCompose = "io.coil-kt:coil-compose:1.3.0"
    }

object Urls {
    const val mavenCentralSnapshotRepo = "https://oss.sonatype.org/content/repositories/snapshots/"
    const val composeSnapshotRepo = "https://androidx.dev/snapshots/builds/" +
        "${Libs.AndroidX.Compose.snapshot}/artifacts/repository/"
}

Coil
基本用法

Image(
    painter = rememberCoilPainter("https://picsum.photos/300/300"),
    contentDescription = stringResource(R.string.image_content_desc),
)

支持渐显crossfade,高斯模糊BlurTransformation，圆角 缩放等

              val painter = rememberImagePainter(
                    data = item.imageUrl,
                    builder = {
                        crossfade(true)
                        crossfade(1000)
                    }
                )
                Image(
                    painter = painter,
                    contentDescription = null,
                    contentScale = ContentScale.Crop,
                    modifier = Modifier.fillMaxSize(),
                )

GIFs 默认不支持, 可以添加支持库 io.coil-kt:coil-gif:1.3.1

分割线
Spacer(Modifier.height(8.dp))

@Composable
fun Spacer(modifier: Modifier) {
    Layout({}, modifier) { _, constraints ->
        with(constraints) {
            val width = if (hasFixedWidth) maxWidth else 0
            val height = if (hasFixedHeight) maxHeight else 0
            layout(width, height) {}
        }
    }
}