Android Weekly Issue #486
All About Opt-In Annotations
Kotlin中的opt-in機制.
有一些api直接使用, 會有警告, 加上這些標記表明自己是故意爲之.
This can guarantee that there has been a conscious decision made about using the API on the use site.
本文示例了:
- 如何創建.
- 如何使用.
- 真實世界中的例子.
還有java, android, api verification.
Measure, measure, measure
如何測量Android的build time.
Jetpack Compose Side-Effects III— rememberUpdatedState
rememberUpdatedState保持一個更新的引用.
@Composable
fun Timer(
buttonColour: String
) {
val timerDuration = 5000L
println("Composing timer with colour : $buttonColour")
val buttonColorUpdated by rememberUpdatedState(newValue = buttonColour)
LaunchedEffect(key1 = Unit, block = {
startTimer(timerDuration) {
println("Timer ended")
println("[1] Last pressed button color is $buttonColour")
println("[2] Last pressed button color is $buttonColorUpdated")
}
})
}
如果不用這個rememberUpdatedState, composable的參數變了, 但是launchedeffect不會重新進, 永遠是第一次的值.
Compose Destinations: a simpler, safer way to navigate in Jetpack Compose
一個用於Compose導航的代碼生成庫: compose-destinations
討論了傳參數的方式.
代碼生成是KSP, 比較先進.
How to Share Composable as Bitmap
從Composable生成Bitmap.
Exception handling in Kotlin Coroutines
協程中的異常處理.
Repository Pattern with Jetpack Compose
Repository pattern和Compose一起, 做了一個搜索單詞的sample.
Speed up your build: Non-transitive R files
可以使build更快, 包體積更小.