TwoStatePreference

Artifact: androidx.preference:preference

Added in 1.0.0

Kotlin |Java

abstract class TwoStatePreference : Preference

kotlin.Any
↳	androidx.preference.Preference
	↳	androidx.preference.TwoStatePreference

Known direct subclasses

CheckBoxPreference, SwitchPreferenceCompat, SwitchPreference

`CheckBoxPreference`	A `Preference` that provides checkbox widget functionality.
`SwitchPreferenceCompat`	A `Preference` that provides a two-state toggleable option.
`SwitchPreference`	A `Preference` that provides a two-state toggleable option.

Common base class for preferences that have two selectable states, save a boolean value, and may have dependent preferences that are enabled/disabled based on the current state.

Summary

Public constructors
`TwoStatePreference(context: Context)`
`TwoStatePreference(context: Context, attrs: AttributeSet?)`
`TwoStatePreference( context: Context, attrs: AttributeSet?, defStyleAttr: Int )`
`TwoStatePreference( context: Context, attrs: AttributeSet?, defStyleAttr: Int, defStyleRes: Int )`

Public functions
`Boolean`	`getDisableDependentsState()` Returns whether dependents are disabled when this preference is on (`true`) or when this preference is off (`false`).
`CharSequence?`	`getSummaryOff()` Returns the summary to be shown when unchecked.
`CharSequence?`	`getSummaryOn()` Returns the summary to be shown when checked.
`Boolean`	`isChecked()` Returns the checked state.
`Unit`	`setChecked(checked: Boolean)` Sets the checked state and saves it.
`Unit`	`setDisableDependentsState(disableDependentsState: Boolean)` Sets whether dependents are disabled when this preference is on (`true`) or when this preference is off (`false`).
`Unit`	`setSummaryOff(summary: CharSequence?)` Sets the summary to be shown when unchecked.
`Unit`	`setSummaryOff(summaryResId: Int)`
`Unit`	`setSummaryOn(summary: CharSequence?)` Sets the summary to be shown when checked.
`Unit`	`setSummaryOn(summaryResId: Int)`
`Boolean`	`shouldDisableDependents()` Checks whether this preference's dependents should currently be disabled.

Protected functions
`Unit`	`onClick()` Processes a click on the preference.
`Any?`	`onGetDefaultValue(a: TypedArray, index: Int)` Called when a preference is being inflated and the default value attribute needs to be read.
`Unit`	`onRestoreInstanceState(state: Parcelable?)` Hook allowing a preference to re-apply a representation of its internal state that had previously been generated by `onSaveInstanceState`.
`Parcelable?`	`onSaveInstanceState()` Hook allowing a preference to generate a representation of its internal state that can later be used to create a new instance with that same state.
`Unit`	`onSetInitialValue(defaultValue: Any!)` Implement this to set the initial value of the preference.
`Unit`	`syncSummaryView(holder: PreferenceViewHolder)` Sync a summary holder contained within holder's sub-hierarchy with the correct summary text.

Protected properties
`Boolean`	`mChecked`

Inherited Constants

From androidx.preference.Preference

const Int

DEFAULT_ORDER = 2147483647

Specify for setOrder if a specific order is not required.

Inherited functions

From java.lang.Comparable

abstract Int

compareTo(p: T!)

From androidx.preference.Preference

`Boolean`	`callChangeListener(newValue: Any!)` Call this method after the user changes the preference, but before the internal state is set.
`Int`	`compareTo(another: Preference)` Compares preference objects based on order (if set), otherwise alphabetically on the titles.
`T?`	`<T : Preference?> findPreferenceInHierarchy(key: String)` Finds a preference in the entire hierarchy (above or below this preference) with the given key.
`Context`	`getContext()` Returns the `Context` of this preference.
`String?`	`getDependency()` Returns the key of the dependency on this preference.
`Bundle`	`getExtras()` Return the extras Bundle object associated with this preference, creating a new Bundle if there currently isn't one.
`String?`	`getFragment()` Return the fragment class name associated with this preference.
`Drawable?`	`getIcon()` Returns the icon of this preference.
`Intent?`	`getIntent()` Return the `Intent` associated with this preference.
`String!`	`getKey()` Gets the key for this preference, which is also the key used for storing values into `SharedPreferences` or `PreferenceDataStore`.
`Int`	`getLayoutResource()` Gets the layout resource that will be shown as the `View` for this preference.
`Preference.OnPreferenceChangeListener?`	`getOnPreferenceChangeListener()` Returns the callback to be invoked when this preference is changed by the user (but before the internal state has been updated).
`Preference.OnPreferenceClickListener?`	`getOnPreferenceClickListener()` Returns the callback to be invoked when this preference is clicked.
`Int`	`getOrder()` Gets the order of this preference with respect to other preference objects on the same level.
`PreferenceGroup?`	`getParent()` Returns the `PreferenceGroup` which is this preference assigned to or `null` if this preference is not assigned to any group or is a root preference.
`Boolean`	`getPersistedBoolean(defaultReturnValue: Boolean)` Attempts to get a persisted `Boolean` if this preference is persistent.
`Float`	`getPersistedFloat(defaultReturnValue: Float)` Attempts to get a persisted `Float` if this preference is persistent.
`Int`	`getPersistedInt(defaultReturnValue: Int)` Attempts to get a persisted `Integer` if this preference is persistent.
`Long`	`getPersistedLong(defaultReturnValue: Long)` Attempts to get a persisted `Long` if this preference is persistent.
`String!`	`getPersistedString(defaultReturnValue: String!)` Attempts to get a persisted set of Strings if this preference is persistent.
`(Mutable)Set<String!>!`	`getPersistedStringSet(defaultReturnValue: (Mutable)Set<String!>!)` Attempts to get a persisted set of Strings if this preference is persistent.
`PreferenceDataStore?`	`getPreferenceDataStore()` Returns `PreferenceDataStore` used by this preference.
`PreferenceManager!`	`getPreferenceManager()` Gets the `PreferenceManager` that manages this preference object's tree.
`SharedPreferences?`	`getSharedPreferences()` Returns the `SharedPreferences` where this preference can read its value(s).
`Boolean`	`getShouldDisableView()` Checks whether this preference should disable its view when it's action is disabled.
`CharSequence?`	`getSummary()` Returns the summary of this preference.
`Preference.SummaryProvider?`	`getSummaryProvider()` Returns the `SummaryProvider` used to configure the summary of this preference.
`CharSequence?`	`getTitle()` Returns the title of this preference.
`Int`	`getWidgetLayoutResource()` Gets the layout resource for the controllable widget portion of this preference.
`Boolean`	`hasKey()` Checks whether this preference has a valid key.
`Boolean`	`isCopyingEnabled()` Returns whether the summary of this preference can be copied to the clipboard by long pressing on the preference.
`Boolean`	`isEnabled()` Checks whether this preference should be enabled in the list.
`Boolean`	`isIconSpaceReserved()` Returns whether the space of this preference icon view is reserved.
`Boolean`	`isPersistent()` Checks whether this preference is persistent.
`Boolean`	`isSelectable()` Checks whether this preference should be selectable in the list.
`Boolean`	`isShown()` Checks whether this preference is shown to the user in the hierarchy.
`Boolean`	`isSingleLineTitle()` Gets whether the title of this preference is constrained to a single line.
`Boolean`	`isVisible()` Checks whether this preference should be visible to the user.
`Unit`	`notifyChanged()` Should be called when the data of this `Preference` has changed.
`Unit`	`notifyDependencyChange(disableDependents: Boolean)` Notifies any listening dependents of a change that affects the dependency.
`Unit`	`notifyHierarchyChanged()` Should be called when a preference has been added/removed from this group, or the ordering should be re-evaluated.
`Unit`	`onAttached()` Called when the preference hierarchy has been attached to the list of preferences.
`Unit`	`onAttachedToHierarchy(preferenceManager: PreferenceManager)` Called when this preference has been attached to a preference hierarchy.
`Unit`	`onBindViewHolder(holder: PreferenceViewHolder)` Binds the created View to the data for this preference.
`Unit`	`onDependencyChanged(dependency: Preference, disableDependent: Boolean)` Called when the dependency changes.
`Unit`	`onDetached()` Called when the preference hierarchy has been detached from the list of preferences.
`Unit`	`@CallSuper onInitializeAccessibilityNodeInfo(info: AccessibilityNodeInfoCompat!)` This function is deprecated. Preferences aren't views.
`Unit`	`onParentChanged(parent: Preference, disableChild: Boolean)` Called when the implicit parent dependency changes.
`Unit`	`onPrepareForRemoval()` Called when this preference is being removed from the hierarchy.
`Unit`	`onSetInitialValue(restorePersistedValue: Boolean, defaultValue: Any!)` This function is deprecated. Use `onSetInitialValue` instead.
`Bundle?`	`peekExtras()` Return the extras Bundle object associated with this preference, returning `null` if there is not currently one.
`Boolean`	`persistBoolean(value: Boolean)` Attempts to persist a `Boolean` if this preference is persistent.
`Boolean`	`persistFloat(value: Float)` Attempts to persist a `Float` if this preference is persistent.
`Boolean`	`persistInt(value: Int)` Attempts to persist an `Integer` if this preference is persistent.
`Boolean`	`persistLong(value: Long)` Attempts to persist a `Long` if this preference is persistent.
`Boolean`	`persistString(value: String!)` Attempts to persist a `String` if this preference is persistent.
`Boolean`	`persistStringSet(values: (Mutable)Set<String!>!)` Attempts to persist a set of Strings if this preference is persistent.
`Unit`	`restoreHierarchyState(container: Bundle)` Restore this preference hierarchy's previously saved state from the given container.
`Unit`	`saveHierarchyState(container: Bundle)` Store this preference hierarchy's frozen state into the given container.
`Unit`	`setCopyingEnabled(enabled: Boolean)` Sets whether the summary of this preference can be copied to the clipboard by long pressing on the preference.
`Unit`	`setDefaultValue(defaultValue: Any!)` Sets the default value for this preference, which will be set either if persistence is off or persistence is on and the preference is not found in the persistent storage.
`Unit`	`setDependency(dependencyKey: String?)` Sets the key of a preference that this preference will depend on.
`Unit`	`setEnabled(enabled: Boolean)` Sets whether this preference is enabled.
`Unit`	`setFragment(fragment: String?)` Sets the class name of a fragment to be shown when this preference is clicked.
`Unit`	`setIcon(icon: Drawable?)` Sets the icon for this preference with a Drawable.
`Unit`	`setIcon(iconResId: Int)` Sets the icon for this preference with a resource ID.
`Unit`	`setIconSpaceReserved(iconSpaceReserved: Boolean)` Sets whether to reserve the space of this preference icon view when no icon is provided.
`Unit`	`setIntent(intent: Intent?)` Sets an `Intent` to be used for `startActivity` when this preference is clicked.
`Unit`	`setKey(key: String!)` Sets the key for this preference, which is used as a key to the `SharedPreferences` or `PreferenceDataStore`.
`Unit`	`setLayoutResource(layoutResId: Int)` Sets the layout resource that is inflated as the `View` to be shown for this preference.
`Unit`	`setOnPreferenceChangeListener( onPreferenceChangeListener: Preference.OnPreferenceChangeListener? )` Sets the callback to be invoked when this preference is changed by the user (but before the internal state has been updated).
`Unit`	`setOnPreferenceClickListener( onPreferenceClickListener: Preference.OnPreferenceClickListener? )` Sets the callback to be invoked when this preference is clicked.
`Unit`	`setOrder(order: Int)` Sets the order of this preference with respect to other preference objects on the same level.
`Unit`	`setPersistent(persistent: Boolean)` Sets whether this preference is persistent.
`Unit`	`setPreferenceDataStore(dataStore: PreferenceDataStore?)` Sets a `PreferenceDataStore` to be used by this preference instead of using `SharedPreferences`.
`Unit`	`setSelectable(selectable: Boolean)` Sets whether this preference is selectable.
`Unit`	`setShouldDisableView(shouldDisableView: Boolean)` Sets whether this preference should disable its view when it gets disabled.
`Unit`	`setSingleLineTitle(singleLineTitle: Boolean)` Sets whether to constrain the title of this preference to a single line instead of letting it wrap onto multiple lines.
`Unit`	`setSummary(summary: CharSequence?)` Sets the summary for this preference with a CharSequence.
`Unit`	`setSummary(summaryResId: Int)` Sets the summary for this preference with a resource ID.
`Unit`	`setSummaryProvider(summaryProvider: Preference.SummaryProvider?)` Set a `SummaryProvider` that will be invoked whenever the summary of this preference is requested.
`Unit`	`setTitle(title: CharSequence?)` Sets the title for this preference with a CharSequence.
`Unit`	`setTitle(titleResId: Int)` Sets the title for this preference with a resource ID.
`Unit`	`setViewId(viewId: Int)` Set the ID that will be assigned to the overall View representing this preference, once bound.
`Unit`	`setVisible(visible: Boolean)` Sets whether this preference should be visible to the user.
`Unit`	`setWidgetLayoutResource(widgetLayoutResId: Int)` Sets the layout for the controllable widget portion of this preference.
`Boolean`	`shouldPersist()` Checks whether, at the given time this method is called, this preference should store/restore its value(s) into the `SharedPreferences` or into `PreferenceDataStore` if assigned.
`String`	`toString()`

Public constructors

TwoStatePreference

Added in 1.0.0

TwoStatePreference(context: Context)

TwoStatePreference

Added in 1.0.0

TwoStatePreference(context: Context, attrs: AttributeSet?)

TwoStatePreference

Added in 1.0.0

TwoStatePreference(
    context: Context,
    attrs: AttributeSet?,
    defStyleAttr: Int
)

TwoStatePreference

Added in 1.0.0

TwoStatePreference(
    context: Context,
    attrs: AttributeSet?,
    defStyleAttr: Int,
    defStyleRes: Int
)

Public functions

getDisableDependentsState

Added in 1.0.0

fun getDisableDependentsState(): Boolean

Returns whether dependents are disabled when this preference is on (true) or when this preference is off (false).

Returns
`Boolean`	Whether dependents are disabled when this preference is on (`true`) or when this preference is off (`false`).

getSummaryOff

Added in 1.0.0

fun getSummaryOff(): CharSequence?

Returns the summary to be shown when unchecked.

Returns
`CharSequence?`	The summary

getSummaryOn

Added in 1.0.0

fun getSummaryOn(): CharSequence?

Returns the summary to be shown when checked.

Returns
`CharSequence?`	The summary

isChecked

Added in 1.0.0

fun isChecked(): Boolean

Returns the checked state.

Returns
`Boolean`	The checked state

setChecked

Added in 1.0.0

fun setChecked(checked: Boolean): Unit

Sets the checked state and saves it.

Parameters
`checked: Boolean`	The checked state

setDisableDependentsState

Added in 1.0.0

fun setDisableDependentsState(disableDependentsState: Boolean): Unit

Sets whether dependents are disabled when this preference is on (true) or when this preference is off (false).

Parameters
`disableDependentsState: Boolean`	The preference state that should disable dependents

setSummaryOff

Added in 1.0.0

fun setSummaryOff(summary: CharSequence?): Unit

Sets the summary to be shown when unchecked.

For more complex configuration of this preference's summary, you should use a Preference.SummaryProvider

Parameters
`summary: CharSequence?`	The summary to be shown when unchecked

setSummaryOff

Added in 1.0.0

fun setSummaryOff(summaryResId: Int): Unit

Parameters
`summaryResId: Int`	The summary as a resource

See also
`setSummaryOff`

setSummaryOn

Added in 1.0.0

fun setSummaryOn(summary: CharSequence?): Unit

Sets the summary to be shown when checked.

For more complex configuration of this preference's summary, you should use a Preference.SummaryProvider

Parameters
`summary: CharSequence?`	The summary to be shown when checked

setSummaryOn

Added in 1.0.0

fun setSummaryOn(summaryResId: Int): Unit

Parameters
`summaryResId: Int`	The summary as a resource

See also
`setSummaryOn`

shouldDisableDependents

fun shouldDisableDependents(): Boolean

Checks whether this preference's dependents should currently be disabled.

Returns
`Boolean`	`true` if the dependents should be disabled, otherwise false

Protected functions

onClick

protected fun onClick(): Unit

Processes a click on the preference. This includes saving the value to the SharedPreferences. However, the overridden method should call callChangeListener to make sure the client wants to update the preference's state with the new value.

onGetDefaultValue

protected fun onGetDefaultValue(a: TypedArray, index: Int): Any?

Called when a preference is being inflated and the default value attribute needs to be read. Since different preference types have different value types, the subclass should get and return the default value which will be its value type.

For example, if the value type is String, the body of the method would proxy to getString.

Parameters
`a: TypedArray`	The set of attributes
`index: Int`	The index of the default value attribute

Returns
`Any?`	The default value of this preference type

onRestoreInstanceState

protected fun onRestoreInstanceState(state: Parcelable?): Unit

Hook allowing a preference to re-apply a representation of its internal state that had previously been generated by onSaveInstanceState. This function will never be called with a null state.

Parameters
`state: Parcelable?`	The saved state that had previously been returned by `onSaveInstanceState`.

See also
`onSaveInstanceState`
`restoreHierarchyState`

onSaveInstanceState

protected fun onSaveInstanceState(): Parcelable?

Hook allowing a preference to generate a representation of its internal state that can later be used to create a new instance with that same state. This state should only contain information that is not persistent or can be reconstructed later.

Returns
`Parcelable?`	A Parcelable object containing the current dynamic state of this preference, or `null` if there is nothing interesting to save. The default implementation returns `null`.

See also
`onRestoreInstanceState`
`saveHierarchyState`

onSetInitialValue

protected fun onSetInitialValue(defaultValue: Any!): Unit

Implement this to set the initial value of the preference.

If you are persisting values to SharedPreferences or a PreferenceDataStore you should restore the saved value for the preference.

If you are not persisting values, or there is no value saved for the preference, you should set the value of the preference to defaultValue.

Parameters
`defaultValue: Any!`	The default value for the preference if set, otherwise `null`.

syncSummaryView

Added in 1.0.0

protected fun syncSummaryView(holder: PreferenceViewHolder): Unit

Sync a summary holder contained within holder's sub-hierarchy with the correct summary text.

Parameters
`holder: PreferenceViewHolder`	A `PreferenceViewHolder` which holds a reference to the summary view

Protected properties

mChecked

Added in 1.0.0

protected val mChecked: Boolean