Код: Выделить всё
Column(
modifier = Modifier.fillMaxSize(),
verticalArrangement = Arrangement.Center,
horizontalAlignment = Alignment.CenterHorizontally
) {
var count by remember { mutableStateOf(0) }
RecompositionCounter(count)
Button(onClick = {count++}) {
Text(text = "Increment")
}
}
@Composable
fun RecompositionCounter(newCount: Int) {
println("newCount is $newCount")
var oldCount by remember { mutableStateOf(newCount) }
SideEffect {
oldCount = newCount
Log.i(TAG, "oldCount is ${oldCount}")
}
Column {
Text("NewCounter ${newCount}")
println("new count has been changed from $oldCount to $newCount") //
Без линии Println в журнале показаны следующие результаты, как и ожидалось. < /p>
System.out newCount is 0
MainActivity oldCount is 0
System.out newCount is 1
MainActivity oldCount is 1
< /code>
Тем не менее, когда включена строка Println, результаты журнала происходят в два раза больше. < /p>
System.out newCount is 0
System.out newCount has been changed from 0 to 0
MainActivity oldCount is 0
System.out newCount is 1
System.out newCount has been changed from 0 to 1
MainActivity oldCount is 1
System.out newCount is 1
System.out newCount has been changed from 1 to 1
MainActivity oldCount is 1
Подробнее здесь: https://stackoverflow.com/questions/796 ... omposition