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DataStore Delegation
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| import androidx.datastore.core.DataStore | |
| import androidx.datastore.preferences.core.Preferences | |
| import androidx.datastore.preferences.core.edit | |
| import kotlinx.coroutines.CoroutineScope | |
| import kotlinx.coroutines.DelicateCoroutinesApi | |
| import kotlinx.coroutines.GlobalScope | |
| import kotlinx.coroutines.flow.first | |
| import kotlinx.coroutines.flow.map | |
| import kotlinx.coroutines.launch | |
| import kotlinx.coroutines.runBlocking | |
| import kotlin.properties.ReadWriteProperty | |
| import kotlin.reflect.KProperty | |
| @DelicateCoroutinesApi | |
| fun <T> DataStore<Preferences>.valueHolder( | |
| key: Preferences.Key<T>, | |
| defaultValue: T, | |
| scope: CoroutineScope = GlobalScope | |
| ): DataStoreValueHolder<T> = DataStoreValueHolder(this, key, defaultValue, scope) | |
| class DataStoreValueHolder<T>( | |
| private val dataStore: DataStore<Preferences>, | |
| private val key: Preferences.Key<T>, | |
| private val defaultValue: T, | |
| private val scope: CoroutineScope | |
| ) : ReadWriteProperty<Any?, T> { | |
| override fun getValue(thisRef: Any?, property: KProperty<*>): T { | |
| return runBlocking(scope.coroutineContext) { | |
| dataStore.data.map { | |
| it[key] ?: defaultValue | |
| }.first() | |
| } | |
| } | |
| override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) { | |
| scope.launch { | |
| dataStore.edit { | |
| it[key] = value | |
| } | |
| } | |
| } | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| import android.content.Context | |
| import androidx.datastore.core.DataStore | |
| import androidx.datastore.preferences.core.Preferences | |
| import androidx.datastore.preferences.core.booleanPreferencesKey | |
| import androidx.datastore.preferences.preferencesDataStore | |
| private val Context.dataStore: DataStore<Preferences> by preferencesDataStore( | |
| name = "settings" | |
| ) | |
| class Usage(context: Context) { | |
| var value by context.dataStore.valueHolder(KEY_BOOLEAN_PREFERENCES, false) | |
| private companion object { | |
| val KEY_BOOLEAN_PREFERENCES = booleanPreferencesKey("boolean_preferences") | |
| } | |
| } |
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