Created
June 22, 2023 05:43
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SavedStateHandleで値の保存と復元が可能な MutableStateFlow
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// from https://medium.com/mobile-app-development-publication/saving-stateflow-state-in-viewmodel-2ee9ed9b1a83 | |
class SavableMutableSaveStateFlow<T>( | |
private val savedStateHandle: SavedStateHandle, | |
private val key: String, | |
defaultValue: T | |
) { | |
private val _state: MutableStateFlow<T> = | |
MutableStateFlow( | |
savedStateHandle.get<T>(key) ?: defaultValue) | |
var value: T | |
get() = _state.value | |
set(value) { | |
_state.value = value | |
savedStateHandle.set(key, value) | |
} | |
fun asStateFlow(): StateFlow<T> = _state | |
} |
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