MutablePreferences



Mutable version of Preferences. Allows for creating Preferences with different key-value pairs.

Summary

Public functions

open Map<Preferences.Key<*>, Any>

Retrieve a map of all key preference pairs.

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Unit
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open operator Boolean
<T : Any?> contains(key: Preferences.Key<T>)

Returns true if this Preferences contains the specified key.

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open operator Boolean
equals(other: Any?)
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open operator T?
<T : Any?> get(key: Preferences.Key<T>)

Get a preference with a key.

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open Int
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operator Unit

Removes the preference with the given key from this MutablePreferences.

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operator Unit

Appends or replaces all pair to this MutablePreferences.

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operator Unit

Appends or replaces all pairs from prefs to this MutablePreferences.

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Unit
putAll(vararg pairs: Preferences.Pair<*>)

Appends or replaces all pairs to this MutablePreferences.

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T
<T : Any?> remove(key: Preferences.Key<T>)

Remove a preferences from this MutablePreferences.

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operator Unit
<T : Any?> set(key: Preferences.Key<T>, value: T)

Set a key value pair in MutablePreferences.

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open String

For better debugging.

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Inherited functions

From androidx.datastore.preferences.core.Preferences
MutablePreferences

Gets a mutable copy of Preferences which contains all the preferences in this Preferences.

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Preferences

Gets a read-only copy of Preferences which contains all the preferences in this Preferences.

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Public functions

asMap

open fun asMap(): Map<Preferences.Key<*>, Any>

Retrieve a map of all key preference pairs. The returned map is unmodifiable, and attempts to mutate it will throw runtime exceptions.

Returns
Map<Preferences.Key<*>, Any>

a map containing all the preferences in this Preferences

clear

fun clear(): Unit

contains

open operator fun <T : Any?> contains(key: Preferences.Key<T>): Boolean

Returns true if this Preferences contains the specified key.

Parameters
key: Preferences.Key<T>

the key to check for

equals

open operator fun equals(other: Any?): Boolean

get

open operator fun <T : Any?> get(key: Preferences.Key<T>): T?

Get a preference with a key. If the key is not set, returns null.

If T is Set, this returns an unmodifiable set which will throw a runtime exception when mutated. Do not try to mutate the returned set.

Use MutablePreferences.set to change the value of a preference (inside a DataStore.edit block).

Parameters
<T : Any?>

the type of the preference

key: Preferences.Key<T>

the key for the preference

Throws
kotlin.ClassCastException

if there is something stored with the same name as key but it cannot be cast to T

hashCode

open fun hashCode(): Int

minusAssign

operator fun minusAssign(key: Preferences.Key<*>): Unit

Removes the preference with the given key from this MutablePreferences. If this Preferences does not contain the key, this is a no-op.

Example usage: mutablePrefs -= COUNTER_KEY

Parameters
key: Preferences.Key<*>

the key to remove from this MutablePreferences

plusAssign

operator fun plusAssign(pair: Preferences.Pair<*>): Unit

Appends or replaces all pair to this MutablePreferences.

Example usage: mutablePrefs += COUNTER_KEY to 100

Parameters
pair: Preferences.Pair<*>

the Preference.Pair to add to this MutablePreferences

plusAssign

operator fun plusAssign(prefs: Preferences): Unit

Appends or replaces all pairs from prefs to this MutablePreferences. Keys in prefs will overwrite keys in this Preferences.

Example usage: mutablePrefs += preferencesOf(COUNTER_KEY to 100, NAME to "abcdef")

Parameters
prefs: Preferences

Preferences to append to this MutablePreferences

putAll

fun putAll(vararg pairs: Preferences.Pair<*>): Unit

Appends or replaces all pairs to this MutablePreferences.

Parameters
vararg pairs: Preferences.Pair<*>

the pairs to append to this MutablePreferences

remove

fun <T : Any?> remove(key: Preferences.Key<T>): T

Remove a preferences from this MutablePreferences.

Parameters
key: Preferences.Key<T>

the key to remove this MutablePreferences

Returns
T

the original value of this preference key.

set

operator fun <T : Any?> set(key: Preferences.Key<T>, value: T): Unit

Set a key value pair in MutablePreferences.

Example usage: val COUNTER_KEY = intPreferencesKey("counter")

// Once edit completes successfully, preferenceStore will contain the incremented counter. preferenceStore.edit { prefs: MutablePreferences -> prefs\[COUNTER_KEY\] = prefs\[COUNTER_KEY\] :? 0 + 1 }

Parameters
key: Preferences.Key<T>

the preference to set

key: Preferences.Key<T>

the value to set the preference to

toString

open fun toString(): String

For better debugging.