一对一直播系统开发Jetpact Compose状态管理存储状态的方式

一对一直播系统开发Jetpact Compose状态管理存储状态的方式
以下三种方式，可以实现对非 Bundle 的数据的保存（配置更改后的保存）
Parcelize
代码示例：

@Parcelize
data class City(val name: String, val country: String) : Parcelable

@Composable
fun CityScreen() {
var selectedCity = rememberSaveable {
mutableStateOf(City("Madrid", "Spain"))
}
}

 

 

MapSaver

data class City(val name: String, val country: String)

val CitySaver = run {
val nameKey = "Name"
val countryKey = "Country"
mapSaver(
save = { mapOf(nameKey to it.name, countryKey to it.country) },
restore = { City(it[nameKey] as String, it[countryKey] as String) }
)
}

@Composable
fun CityScreen() {
var selectedCity = rememberSaveable(stateSaver = CitySaver) {
mutableStateOf(City("Madrid", "Spain"))
}
}

 

ListSaver

data class City(val name: String, val country: String)

val CitySaver = listSaver<City, Any>(
save = { listOf(it.name, it.country) },//数组中保存的值和City中的属性是顺序对应的
restore = { City(it[0] as String, it[1] as String) }
)

@Composable
fun CityScreen() {
var selectedCity = rememberSaveable(stateSaver = CitySaver) {
mutableStateOf(City("Madrid", "Spain"))
}
}
 

 

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