Preference


class Preference : Comparable

Known direct subclasses
DialogPreference

A base class for Preferences that are dialog-based.

PreferenceGroup

A container for multiple Preferences.

SeekBarPreference

Preference based on android.preference.SeekBarPreference but uses support preference as a base .

TwoStatePreference

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.

Known indirect subclasses
CheckBoxPreference

A Preference that provides checkbox widget functionality.

DropDownPreference

A ListPreference that presents the options in a drop down menu rather than a dialog.

EditTextPreference

A DialogPreference that shows a EditText in the dialog.

ListPreference

A Preference that displays a list of entries as a dialog.

MultiSelectListPreference

A Preference that displays a list of entries as a dialog.

PreferenceCategory

A container that is used to group similar Preferences.

PreferenceScreen

A top-level container that represents a settings screen.

SwitchPreferenceCompat

A Preference that provides a two-state toggleable option.

SwitchPreference

A Preference that provides a two-state toggleable option.


The basic building block that represents an individual setting displayed to a user in the preference hierarchy. This class provides the data that will be displayed to the user and has a reference to the SharedPreferences or PreferenceDataStore instance that persists the preference's values.

When specifying a preference hierarchy in XML, each element can point to a subclass of Preference, similar to the view hierarchy and layouts.

This class contains a key that that represents the key that is used to persist the value to the device. It is up to the subclass to decide how to store the value.

name android:icon

name android:key

name android:title

name android:summary

name android:order

name android:fragment

name android:layout

name android:widgetLayout

name android:enabled

name android:selectable

name android:dependency

name android:persistent

name android:defaultValue

name android:shouldDisableView

name android:singleLineTitle

name android:iconSpaceReserved

Summary

Nested types

A base class for managing the instance state of a Preference.

Interface definition for a callback to be invoked when the value of this Preference has been changed by the user and is about to be set and/or persisted.

Interface definition for a callback to be invoked when a Preference is clicked.

Interface definition for a callback to be invoked when the summary of this Preference is requested (typically when this preference is added to the hierarchy or its value is updated).

Constants

const Int
DEFAULT_ORDER = 2147483647

Specify for setOrder if a specific order is not required.

Public constructors

Preference(context: Context)

Constructor to create a preference.

Preference(context: Context, attrs: AttributeSet?)

Constructor that is called when inflating a preference from XML.

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

Perform inflation from XML and apply a class-specific base style.

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

Perform inflation from XML and apply a class-specific base style.

Public functions

Boolean
callChangeListener(newValue: Any!)

Call this method after the user changes the preference, but before the internal state is set.

Int

Compares preference objects based on order (if set), otherwise alphabetically on the titles.

Context

Returns the Context of this preference.

String?

Returns the key of the dependency on this preference.

Bundle

Return the extras Bundle object associated with this preference, creating a new Bundle if there currently isn't one.

String?

Return the fragment class name associated with this preference.

Drawable?

Returns the icon of this preference.

Intent?

Return the Intent associated with this preference.

String!

Gets the key for this preference, which is also the key used for storing values into SharedPreferences or PreferenceDataStore.

Int

Gets the layout resource that will be shown as the View for this preference.

Preference.OnPreferenceChangeListener?

Returns the callback to be invoked when this preference is changed by the user (but before the internal state has been updated).

Preference.OnPreferenceClickListener?

Returns the callback to be invoked when this preference is clicked.

Int

Gets the order of this preference with respect to other preference objects on the same level.

PreferenceGroup?

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.

(Mutable)Set<String!>!
getPersistedStringSet(defaultReturnValue: (Mutable)Set<String!>!)

Attempts to get a persisted set of Strings if this preference is persistent.

PreferenceDataStore?

Returns PreferenceDataStore used by this preference.

PreferenceManager!

Gets the PreferenceManager that manages this preference object's tree.

SharedPreferences?

Returns the SharedPreferences where this preference can read its value(s).

Boolean

Checks whether this preference should disable its view when it's action is disabled.

CharSequence?

Returns the summary of this preference.

Preference.SummaryProvider?

Returns the SummaryProvider used to configure the summary of this preference.

CharSequence?

Returns the title of this preference.

Int

Gets the layout resource for the controllable widget portion of this preference.

Boolean

Checks whether this preference has a valid key.

Boolean

Returns whether the summary of this preference can be copied to the clipboard by long pressing on the preference.

Boolean

Checks whether this preference should be enabled in the list.

Boolean

Returns whether the space of this preference icon view is reserved.

Boolean

Checks whether this preference is persistent.

Boolean

Checks whether this preference should be selectable in the list.

Boolean

Checks whether this preference is shown to the user in the hierarchy.

Boolean

Gets whether the title of this preference is constrained to a single line.

Boolean

Checks whether this preference should be visible to the user.

Unit
notifyDependencyChange(disableDependents: Boolean)

Notifies any listening dependents of a change that affects the dependency.

Unit

Called when the preference hierarchy has been attached to the list of preferences.

Unit

Binds the created View to the data for this preference.

Unit
onDependencyChanged(dependency: Preference, disableDependent: Boolean)

Called when the dependency changes.

Unit

Called when the preference hierarchy has been detached from the list of preferences.

Unit

This function is deprecated.

Preferences aren't views.

Unit
onParentChanged(parent: Preference, disableChild: Boolean)

Called when the implicit parent dependency changes.

Bundle?

Return the extras Bundle object associated with this preference, returning null if there is not currently one.

Boolean

Attempts to persist a set of Strings if this preference is persistent.

Unit

Restore this preference hierarchy's previously saved state from the given container.

Unit

Store this preference hierarchy's frozen state into the given container.

Unit

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

Sets the callback to be invoked when this preference is changed by the user (but before the internal state has been updated).

Unit

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

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

Sets the summary for this preference with a CharSequence.

Unit
setSummary(summaryResId: Int)

Sets the summary for this preference with a resource ID.

Unit

Set a SummaryProvider that will be invoked whenever the summary of this preference is requested.

Unit

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

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

String

Protected functions

T?

Finds a preference in the entire hierarchy (above or below this preference) with the given key.

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.

Unit

Should be called when the data of this Preference has changed.

Unit

Should be called when a preference has been added/removed from this group, or the ordering should be re-evaluated.

Unit

Called when this preference has been attached to a preference hierarchy.

Unit

Processes a click on the preference.

Any?

Called when a preference is being inflated and the default value attribute needs to be read.

Unit

Called when this preference is being removed from the hierarchy.

Unit

Hook allowing a preference to re-apply a representation of its internal state that had previously been generated by 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.

Unit
onSetInitialValue(defaultValue: Any?)

Implement this to set the initial value of the preference.

Unit
onSetInitialValue(restorePersistedValue: Boolean, defaultValue: Any!)

This function is deprecated.

Use onSetInitialValue instead.

Boolean

Attempts to persist a Boolean if this preference is persistent.

Boolean

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

Attempts to persist a String if this preference is persistent.

Boolean

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.

Constants

DEFAULT_ORDER

Added in 1.0.0
const val DEFAULT_ORDER = 2147483647: Int

Specify for setOrder if a specific order is not required.

Public constructors

Preference

Added in 1.0.0
Preference(context: Context)

Constructor to create a preference.

Parameters
context: Context

The Context this is associated with, through which it can access the current theme, resources, SharedPreferences, etc.

Preference

Added in 1.0.0
Preference(context: Context, attrs: AttributeSet?)

Constructor that is called when inflating a preference from XML. This is called when a preference is being constructed from an XML file, supplying attributes that were specified in the XML file. This version uses a default style of 0, so the only attribute values applied are those in the Context's Theme and the given AttributeSet.

Parameters
context: Context

The Context this is associated with, through which it can access the current theme, resources, SharedPreferences, etc.

attrs: AttributeSet?

The attributes of the XML tag that is inflating the preference

See also
Preference

Preference

Added in 1.0.0
Preference(context: Context, attrs: AttributeSet?, defStyleAttr: Int)

Perform inflation from XML and apply a class-specific base style. This constructor allows subclasses to use their own base style when they are inflating. For example, a CheckBoxPreference constructor calls this version of the super class constructor and supplies android.R.attr.checkBoxPreferenceStyle for defStyleAttr. This allows the theme's checkbox preference style to modify all of the base preference attributes as well as the CheckBoxPreference class's attributes.

Parameters
context: Context

The Context this is associated with, through which it can access the current theme, resources, SharedPreferences, etc.

attrs: AttributeSet?

The attributes of the XML tag that is inflating the preference

defStyleAttr: Int

An attribute in the current theme that contains a reference to a style resource that supplies default values for the view. Can be 0 to not look for defaults.

See also
Preference

Preference

Added in 1.0.0
Preference(
    context: Context,
    attrs: AttributeSet?,
    defStyleAttr: Int,
    defStyleRes: Int
)

Perform inflation from XML and apply a class-specific base style. This constructor allows subclasses to use their own base style when they are inflating. For example, a CheckBoxPreference constructor calls this version of the super class constructor and supplies android.R.attr.checkBoxPreferenceStyle for defStyleAttr. This allows the theme's checkbox preference style to modify all of the base preference attributes as well as the CheckBoxPreference class's attributes.

Parameters
context: Context

The Context this is associated with, through which it can access the current theme, resources, SharedPreferences, etc.

attrs: AttributeSet?

The attributes of the XML tag that is inflating the preference

defStyleAttr: Int

An attribute in the current theme that contains a reference to a style resource that supplies default values for the view. Can be 0 to not look for defaults.

defStyleRes: Int

A resource identifier of a style resource that supplies default values for the view, used only if defStyleAttr is 0 or can not be found in the theme. Can be 0 to not look for defaults.

See also
Preference

Public functions

callChangeListener

Added in 1.0.0
fun callChangeListener(newValue: Any!): Boolean

Call this method after the user changes the preference, but before the internal state is set. This allows the client to ignore the user value.

Parameters
newValue: Any!

The new value of this preference

Returns
Boolean

true if the user value should be set as the preference value (and persisted)

compareTo

Added in 1.0.0
fun compareTo(another: Preference): Int

Compares preference objects based on order (if set), otherwise alphabetically on the titles.

Parameters
another: Preference

The preference to compare to this one

Returns
Int

0 if the same; less than 0 if this preference sorts ahead of another; greater than 0 if this preference sorts after another.

getContext

Added in 1.0.0
fun getContext(): Context

Returns the Context of this preference. Each preference in a preference hierarchy can be from different Context (for example, if multiple activities provide preferences into a single PreferenceFragmentCompat). This Context will be used to save the preference values.

Returns
Context

The Context of this preference

getDependency

Added in 1.0.0
fun getDependency(): String?

Returns the key of the dependency on this preference.

Returns
String?

The key of the dependency

See also
setDependency

getExtras

Added in 1.0.0
fun getExtras(): Bundle

Return the extras Bundle object associated with this preference, creating a new Bundle if there currently isn't one. You can use this to get and set individual extra key/value pairs.

getFragment

Added in 1.0.0
fun getFragment(): String?

Return the fragment class name associated with this preference.

Returns
String?

The fragment class name last set via setFragment or XML

getIcon

Added in 1.0.0
fun getIcon(): Drawable?

Returns the icon of this preference.

Returns
Drawable?

The icon

See also
setIcon

getIntent

Added in 1.0.0
fun getIntent(): Intent?

Return the Intent associated with this preference.

Returns
Intent?

The Intent last set via setIntent or XML

getKey

Added in 1.0.0
fun getKey(): String!

Gets the key for this preference, which is also the key used for storing values into SharedPreferences or PreferenceDataStore.

Returns
String!

The key

getLayoutResource

Added in 1.0.0
fun getLayoutResource(): Int

Gets the layout resource that will be shown as the View for this preference.

Returns
Int

The layout resource ID

getOnPreferenceChangeListener

Added in 1.0.0
fun getOnPreferenceChangeListener(): Preference.OnPreferenceChangeListener?

Returns the callback to be invoked when this preference is changed by the user (but before the internal state has been updated).

Returns
Preference.OnPreferenceChangeListener?

The callback to be invoked

getOnPreferenceClickListener

Added in 1.0.0
fun getOnPreferenceClickListener(): Preference.OnPreferenceClickListener?

Returns the callback to be invoked when this preference is clicked.

Returns
Preference.OnPreferenceClickListener?

The callback to be invoked

getOrder

Added in 1.0.0
fun getOrder(): Int

Gets the order of this preference with respect to other preference objects on the same level.

Returns
Int

The order of this preference

See also
setOrder

getParent

Added in 1.0.0
fun getParent(): PreferenceGroup?

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.

Returns
PreferenceGroup?

The parent PreferenceGroup or null if not attached to any

getPersistedStringSet

Added in 1.0.0
fun getPersistedStringSet(defaultReturnValue: (Mutable)Set<String!>!): (Mutable)Set<String!>!

Attempts to get a persisted set of Strings if this preference is persistent.

Parameters
defaultReturnValue: (Mutable)Set<String!>!

The default value to return if either this preference is not persistent or this preference is not present.

Returns
(Mutable)Set<String!>!

The value from the storage or the default return value

See also
persistStringSet

getPreferenceDataStore

Added in 1.0.0
fun getPreferenceDataStore(): PreferenceDataStore?

Returns PreferenceDataStore used by this preference. Returns null if SharedPreferences is used instead.

By default preferences always use SharedPreferences. To make this preference to use the PreferenceDataStore you need to assign your implementation to the preference itself via setPreferenceDataStore or to its PreferenceManager via setPreferenceDataStore.

Returns
PreferenceDataStore?

The PreferenceDataStore used by this preference or null if none

getPreferenceManager

Added in 1.0.0
fun getPreferenceManager(): PreferenceManager!

Gets the PreferenceManager that manages this preference object's tree.

getSharedPreferences

Added in 1.0.0
fun getSharedPreferences(): SharedPreferences?

Returns the SharedPreferences where this preference can read its value(s). Usually, it's easier to use one of the helper read methods: getPersistedBoolean, getPersistedFloat, getPersistedInt, getPersistedLong, getPersistedString.

Returns
SharedPreferences?

The SharedPreferences where this preference reads its value(s). If this preference is not attached to a preference hierarchy or if a PreferenceDataStore has been set, this method returns null.

getShouldDisableView

Added in 1.0.0
fun getShouldDisableView(): Boolean

Checks whether this preference should disable its view when it's action is disabled.

Returns
Boolean

true if it should disable the view

getSummary

Added in 1.0.0
fun getSummary(): CharSequence?

Returns the summary of this preference. If a SummaryProvider has been set for this preference, it will be used to provide the summary returned by this method.

Returns
CharSequence?

The summary

getSummaryProvider

Added in 1.1.0
fun getSummaryProvider(): Preference.SummaryProvider?

Returns the SummaryProvider used to configure the summary of this preference.

Returns
Preference.SummaryProvider?

The SummaryProvider used to configure the summary of this preference, or null if there is no SummaryProvider set

getTitle

Added in 1.0.0
fun getTitle(): CharSequence?

Returns the title of this preference.

Returns
CharSequence?

The title

See also
setTitle

getWidgetLayoutResource

Added in 1.0.0
fun getWidgetLayoutResource(): Int

Gets the layout resource for the controllable widget portion of this preference.

Returns
Int

The layout resource ID

hasKey

Added in 1.0.0
fun hasKey(): Boolean

Checks whether this preference has a valid key.

Returns
Boolean

true if the key exists and is not a blank string, false otherwise

isCopyingEnabled

Added in 1.1.0
fun isCopyingEnabled(): Boolean

Returns whether the summary of this preference can be copied to the clipboard by long pressing on the preference.

Returns
Boolean

true if copying is enabled, false otherwise

isEnabled

Added in 1.0.0
fun isEnabled(): Boolean

Checks whether this preference should be enabled in the list.

Returns
Boolean

true if this preference is enabled, false otherwise

isIconSpaceReserved

Added in 1.0.0
fun isIconSpaceReserved(): Boolean

Returns whether the space of this preference icon view is reserved.

Returns
Boolean

true if the space of this preference icon view is reserved iconSpaceReserved

isPersistent

Added in 1.0.0
fun isPersistent(): Boolean

Checks whether this preference is persistent. If it is, it stores its value(s) into the persistent SharedPreferences storage by default or into PreferenceDataStore if assigned.

Returns
Boolean

true if persistent

isSelectable

Added in 1.0.0
fun isSelectable(): Boolean

Checks whether this preference should be selectable in the list.

Returns
Boolean

true if it is selectable, false otherwise

isShown

Added in 1.0.0
fun isShown(): Boolean

Checks whether this preference is shown to the user in the hierarchy. For a preference to be shown in the hierarchy, it and all of its ancestors must be visible and attached to the root PreferenceScreen.

Returns
Boolean

true if this preference is shown to the user in the hierarchy

isSingleLineTitle

Added in 1.0.0
fun isSingleLineTitle(): Boolean

Gets whether the title of this preference is constrained to a single line.

Returns
Boolean

true if the title of this preference is constrained to a single line singleLineTitle

isVisible

Added in 1.0.0
fun isVisible(): Boolean

Checks whether this preference should be visible to the user. If this preference is visible, but one or more of its ancestors are not visible, then this preference will not be shown until its ancestors are all visible.

Returns
Boolean

true if this preference should be displayed

See also
setVisible
isShown

notifyDependencyChange

Added in 1.0.0
fun notifyDependencyChange(disableDependents: Boolean): Unit

Notifies any listening dependents of a change that affects the dependency.

Parameters
disableDependents: Boolean

Whether this preference should disable its dependents.

onAttached

Added in 1.0.0
fun onAttached(): Unit

Called when the preference hierarchy has been attached to the list of preferences. This can also be called when this preference has been attached to a group that was already attached to the list of preferences.

onBindViewHolder

Added in 1.0.0
fun onBindViewHolder(holder: PreferenceViewHolder): Unit

Binds the created View to the data for this preference.

This is a good place to grab references to custom Views in the layout and set properties on them.

Make sure to call through to the superclass's implementation.

Parameters
holder: PreferenceViewHolder

The ViewHolder that provides references to the views to fill in. These views will be recycled, so you should not hold a reference to them after this method returns.

onDependencyChanged

Added in 1.0.0
fun onDependencyChanged(dependency: Preference, disableDependent: Boolean): Unit

Called when the dependency changes.

Parameters
dependency: Preference

The preference that this preference depends on

disableDependent: Boolean

Set true to disable this preference

onDetached

Added in 1.0.0
fun onDetached(): Unit

Called when the preference hierarchy has been detached from the list of preferences. This can also be called when this preference has been removed from a group that was attached to the list of preferences.

onInitializeAccessibilityNodeInfo

Added in 1.0.0
Deprecated in 1.1.0
@CallSuper
fun onInitializeAccessibilityNodeInfo(info: AccessibilityNodeInfoCompat!): Unit

Initializes an android.view.accessibility.AccessibilityNodeInfo with information about the View for this preference.

onParentChanged

Added in 1.0.0
fun onParentChanged(parent: Preference, disableChild: Boolean): Unit

Called when the implicit parent dependency changes.

Parameters
parent: Preference

The preference that this preference depends on

disableChild: Boolean

Set true to disable this preference

peekExtras

Added in 1.0.0
fun peekExtras(): Bundle?

Return the extras Bundle object associated with this preference, returning null if there is not currently one.

persistStringSet

Added in 1.0.0
fun persistStringSet(values: (Mutable)Set<String!>!): Boolean

Attempts to persist a set of Strings if this preference is persistent.

The returned value doesn't reflect whether the given value was persisted, since we may not necessarily commit if there will be a batch commit later.

Parameters
values: (Mutable)Set<String!>!

The values to persist

Returns
Boolean

true if the preference is persistent, false otherwise

restoreHierarchyState

Added in 1.0.0
fun restoreHierarchyState(container: Bundle): Unit

Restore this preference hierarchy's previously saved state from the given container.

Parameters
container: Bundle

The Bundle that holds the previously saved state

saveHierarchyState

Added in 1.0.0
fun saveHierarchyState(container: Bundle): Unit

Store this preference hierarchy's frozen state into the given container.

Parameters
container: Bundle

The Bundle in which to save the instance of this preference

setCopyingEnabled

Added in 1.1.0
fun setCopyingEnabled(enabled: Boolean): Unit

Sets whether the summary of this preference can be copied to the clipboard by long pressing on the preference.

Parameters
enabled: Boolean

Set true to enable copying the summary of this preference

setDefaultValue

Added in 1.0.0
fun setDefaultValue(defaultValue: Any!): Unit

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.

Parameters
defaultValue: Any!

The default value

setDependency

Added in 1.0.0
fun setDependency(dependencyKey: String?): Unit

Sets the key of a preference that this preference will depend on. If that preference is not set or is off, this preference will be disabled.

Parameters
dependencyKey: String?

The key of the preference that this depends on

setEnabled

Added in 1.0.0
fun setEnabled(enabled: Boolean): Unit

Sets whether this preference is enabled. If disabled, it will not handle clicks.

Parameters
enabled: Boolean

Set true to enable it

setFragment

Added in 1.0.0
fun setFragment(fragment: String?): Unit

Sets the class name of a fragment to be shown when this preference is clicked.

Parameters
fragment: String?

The class name of the fragment associated with this preference

setIcon

Added in 1.0.0
fun setIcon(icon: Drawable?): Unit

Sets the icon for this preference with a Drawable. This icon will be placed into the ID icon within the View created by onBindViewHolder.

Parameters
icon: Drawable?

The optional icon for this preference

setIcon

Added in 1.0.0
fun setIcon(iconResId: Int): Unit

Sets the icon for this preference with a resource ID.

Parameters
iconResId: Int

The icon as a resource ID

See also
setIcon

setIconSpaceReserved

Added in 1.0.0
fun setIconSpaceReserved(iconSpaceReserved: Boolean): Unit

Sets whether to reserve the space of this preference icon view when no icon is provided. If set to true, the preference will be offset as if it would have the icon and thus aligned with other preferences having icons.

Parameters
iconSpaceReserved: Boolean

Set true if the space for the icon view should be reserved iconSpaceReserved

setIntent

Added in 1.0.0
fun setIntent(intent: Intent?): Unit

Sets an Intent to be used for startActivity when this preference is clicked.

Parameters
intent: Intent?

The intent associated with this preference

setKey

Added in 1.0.0
fun setKey(key: String!): Unit

Sets the key for this preference, which is used as a key to the SharedPreferences or PreferenceDataStore. This should be unique for the package.

Parameters
key: String!

The key for the preference

setLayoutResource

Added in 1.0.0
fun setLayoutResource(layoutResId: Int): Unit

Sets the layout resource that is inflated as the View to be shown for this preference. In most cases, the default layout is sufficient for custom preference objects and only the widget layout needs to be changed.

This layout should contain a ViewGroup with ID widget_frame to be the parent of the specific widget for this preference. It should similarly contain title and summary.

It is an error to change the layout after adding the preference to a PreferenceGroup.

Parameters
layoutResId: Int

The layout resource ID to be inflated and returned as a View

setOnPreferenceChangeListener

Added in 1.0.0
fun setOnPreferenceChangeListener(
    onPreferenceChangeListener: Preference.OnPreferenceChangeListener?
): Unit

Sets the callback to be invoked when this preference is changed by the user (but before the internal state has been updated).

Parameters
onPreferenceChangeListener: Preference.OnPreferenceChangeListener?

The callback to be invoked

setOnPreferenceClickListener

Added in 1.0.0
fun setOnPreferenceClickListener(
    onPreferenceClickListener: Preference.OnPreferenceClickListener?
): Unit

Sets the callback to be invoked when this preference is clicked.

Parameters
onPreferenceClickListener: Preference.OnPreferenceClickListener?

The callback to be invoked

setOrder

Added in 1.0.0
fun setOrder(order: Int): Unit

Sets the order of this preference with respect to other preference objects on the same level. If this is not specified, the default behavior is to sort alphabetically. The setOrderingAsAdded can be used to order preference objects based on the order they appear in the XML.

Parameters
order: Int

The order for this preference. A lower value will be shown first. Use DEFAULT_ORDER to sort alphabetically or allow ordering from XML.

setPersistent

Added in 1.0.0
fun setPersistent(persistent: Boolean): Unit

Sets whether this preference is persistent. When persistent, it stores its value(s) into the persistent SharedPreferences storage by default or into PreferenceDataStore if assigned.

Parameters
persistent: Boolean

Set true if it should store its value(s) into the storage

setPreferenceDataStore

Added in 1.0.0
fun setPreferenceDataStore(dataStore: PreferenceDataStore?): Unit

Sets a PreferenceDataStore to be used by this preference instead of using SharedPreferences.

The data store will remain assigned even if the preference is moved around the preference hierarchy. It will also override a data store propagated from the PreferenceManager that owns this preference.

Parameters
dataStore: PreferenceDataStore?

The PreferenceDataStore to be used by this preference

setSelectable

Added in 1.0.0
fun setSelectable(selectable: Boolean): Unit

Sets whether this preference is selectable.

Parameters
selectable: Boolean

Set true to make it selectable

setShouldDisableView

Added in 1.0.0
fun setShouldDisableView(shouldDisableView: Boolean): Unit

Sets whether this preference should disable its view when it gets disabled.

For example, set this and setEnabled to false for preferences that are only displaying information and 1) should not be clickable 2) should not have the view set to the disabled state.

Parameters
shouldDisableView: Boolean

Set true if this preference should disable its view when the preference is disabled.

setSingleLineTitle

Added in 1.0.0
fun setSingleLineTitle(singleLineTitle: Boolean): Unit

Sets whether to constrain the title of this preference to a single line instead of letting it wrap onto multiple lines.

Parameters
singleLineTitle: Boolean

Set true if the title should be constrained to one line singleLineTitle

setSummary

Added in 1.0.0
fun setSummary(summary: CharSequence?): Unit

Sets the summary for this preference with a CharSequence.

You can also use a SummaryProvider to dynamically configure the summary of this preference.

Parameters
summary: CharSequence?

The summary for the preference

Throws
java.lang.IllegalStateException

If a SummaryProvider has already been set.

setSummary

Added in 1.0.0
fun setSummary(summaryResId: Int): Unit

Sets the summary for this preference with a resource ID.

You can also use a SummaryProvider to dynamically configure the summary of this preference.

Parameters
summaryResId: Int

The summary as a resource

setSummaryProvider

Added in 1.1.0
fun setSummaryProvider(summaryProvider: Preference.SummaryProvider?): Unit

Set a SummaryProvider that will be invoked whenever the summary of this preference is requested. Set null to remove the existing SummaryProvider.

Parameters
summaryProvider: Preference.SummaryProvider?

The SummaryProvider that will be invoked whenever the summary of this preference is requested

setTitle

Added in 1.0.0
fun setTitle(title: CharSequence?): Unit

Sets the title for this preference with a CharSequence. This title will be placed into the ID title within the View bound by onBindViewHolder.

Parameters
title: CharSequence?

The title for this preference

setTitle

Added in 1.0.0
fun setTitle(titleResId: Int): Unit

Sets the title for this preference with a resource ID.

Parameters
titleResId: Int

The title as a resource ID

See also
setTitle

setViewId

Added in 1.0.0
fun setViewId(viewId: Int): Unit

Set the ID that will be assigned to the overall View representing this preference, once bound.

See also
setId

setVisible

Added in 1.0.0
fun setVisible(visible: Boolean): Unit

Sets whether this preference should be visible to the user. If false, it is excluded from the adapter, but can still be retrieved using findPreference.

To show this preference to the user, its ancestors must also all be visible. If you make a PreferenceGroup invisible, none of its children will be shown to the user until the group is visible.

Parameters
visible: Boolean

Set false if this preference should be hidden from the user isPreferenceVisible

See also
isShown

setWidgetLayoutResource

Added in 1.0.0
fun setWidgetLayoutResource(widgetLayoutResId: Int): Unit

Sets the layout for the controllable widget portion of this preference. This is inflated into the main layout. For example, a CheckBoxPreference would specify a custom layout (consisting of just the CheckBox) here, instead of creating its own main layout.

It is an error to change the layout after adding the preference to a PreferenceGroup.

Parameters
widgetLayoutResId: Int

The layout resource ID to be inflated into the main layout

shouldDisableDependents

Added in 1.0.0
fun shouldDisableDependents(): Boolean

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

Returns
Boolean

true if the dependents should be disabled, otherwise false

toString

fun toString(): String

Protected functions

findPreferenceInHierarchy

Added in 1.1.0
protected fun <T : Preference?> findPreferenceInHierarchy(key: String): T?

Finds a preference in the entire hierarchy (above or below this preference) with the given key. Returns null if no preference could be found with the given key.

This only works after this preference has been attached to a hierarchy.

Parameters
key: String

The key of the preference to retrieve

Returns
T?

The preference with the key, or null

See also
findPreference

getPersistedBoolean

Added in 1.0.0
protected fun getPersistedBoolean(defaultReturnValue: Boolean): Boolean

Attempts to get a persisted Boolean if this preference is persistent.

Parameters
defaultReturnValue: Boolean

The default value to return if either this preference is not persistent or this preference is not in the SharedPreferences.

Returns
Boolean

The value from the storage or the default return value

getPersistedFloat

Added in 1.0.0
protected fun getPersistedFloat(defaultReturnValue: Float): Float

Attempts to get a persisted Float if this preference is persistent.

Parameters
defaultReturnValue: Float

The default value to return if either this preference is not persistent or this preference is not saved.

Returns
Float

The value from the storage or the default return value

getPersistedInt

Added in 1.0.0
protected fun getPersistedInt(defaultReturnValue: Int): Int

Attempts to get a persisted Integer if this preference is persistent.

Parameters
defaultReturnValue: Int

The default value to return if either this preference is not persistent or this preference is not in the SharedPreferences.

Returns
Int

The value from the storage or the default return value

getPersistedLong

Added in 1.0.0
protected fun getPersistedLong(defaultReturnValue: Long): Long

Attempts to get a persisted Long if this preference is persistent.

Parameters
defaultReturnValue: Long

The default value to return if either this preference is not persistent or this preference is not in the SharedPreferences.

Returns
Long

The value from the storage or the default return value

getPersistedString

Added in 1.0.0
protected fun getPersistedString(defaultReturnValue: String!): String!

Attempts to get a persisted set of Strings if this preference is persistent.

Parameters
defaultReturnValue: String!

The default value to return if either the preference is not persistent or the preference is not in the shared preferences.

Returns
String!

The value from the storage or the default return value

See also
persistString

notifyChanged

Added in 1.0.0
protected fun notifyChanged(): Unit

Should be called when the data of this Preference has changed.

notifyHierarchyChanged

Added in 1.0.0
protected fun notifyHierarchyChanged(): Unit

Should be called when a preference has been added/removed from this group, or the ordering should be re-evaluated.

onAttachedToHierarchy

Added in 1.0.0
protected fun onAttachedToHierarchy(preferenceManager: PreferenceManager): Unit

Called when this preference has been attached to a preference hierarchy. Make sure to call the super implementation.

Parameters
preferenceManager: PreferenceManager

The PreferenceManager of the hierarchy

onClick

Added in 1.0.0
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

Added in 1.0.0
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

onPrepareForRemoval

Added in 1.0.0
protected fun onPrepareForRemoval(): Unit

Called when this preference is being removed from the hierarchy. You should remove any references to this preference that you know about. Make sure to call through to the superclass implementation.

onRestoreInstanceState

Added in 1.0.0
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.

onSaveInstanceState

Added in 1.0.0
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.

onSetInitialValue

Added in 1.0.0
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.

onSetInitialValue

Added in 1.0.0
Deprecated in 1.0.0
protected fun onSetInitialValue(restorePersistedValue: Boolean, defaultValue: Any!): Unit

Implement this to set the initial value of the preference.

If restorePersistedValue is true, you should restore the preference value from the SharedPreferences. If restorePersistedValue is false, you should set the preference value to defaultValue that is given (and possibly store to SharedPreferences if shouldPersist is true).

In case of using PreferenceDataStore, the restorePersistedValue is always true but the default value (if provided) is set.

This may not always be called. One example is if it should not persist but there is no default value given.

Parameters
restorePersistedValue: Boolean

True to restore the persisted value; false to use the given defaultValue.

defaultValue: Any!

The default value for this preference. Only use this if restorePersistedValue is false.

persistBoolean

Added in 1.0.0
protected fun persistBoolean(value: Boolean): Boolean

Attempts to persist a Boolean if this preference is persistent.

The returned value doesn't reflect whether the given value was persisted, since we may not necessarily commit if there will be a batch commit later.

Parameters
value: Boolean

The value to persist

Returns
Boolean

true if the preference is persistent, false otherwise

persistFloat

Added in 1.0.0
protected fun persistFloat(value: Float): Boolean

Attempts to persist a Float if this preference is persistent.

The returned value doesn't reflect whether the given value was persisted, since we may not necessarily commit if there will be a batch commit later.

Parameters
value: Float

The value to persist

Returns
Boolean

true if the preference is persistent, false otherwise

persistInt

Added in 1.0.0
protected fun persistInt(value: Int): Boolean

Attempts to persist an Integer if this preference is persistent.

The returned value doesn't reflect whether the given value was persisted, since we may not necessarily commit if there will be a batch commit later.

Parameters
value: Int

The value to persist

Returns
Boolean

true if the preference is persistent, false otherwise

persistLong

Added in 1.0.0
protected fun persistLong(value: Long): Boolean

Attempts to persist a Long if this preference is persistent.

The returned value doesn't reflect whether the given value was persisted, since we may not necessarily commit if there will be a batch commit later.

Parameters
value: Long

The value to persist

Returns
Boolean

true if the preference is persistent, false otherwise

persistString

Added in 1.0.0
protected fun persistString(value: String!): Boolean

Attempts to persist a String if this preference is persistent.

The returned value doesn't reflect whether the given value was persisted, since we may not necessarily commit if there will be a batch commit later.

Parameters
value: String!

The value to persist

Returns
Boolean

true if the preference is persistent, false otherwise

shouldPersist

Added in 1.0.0
protected fun shouldPersist(): Boolean

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. This, at minimum, checks whether this preference is persistent and it currently has a key. Before you save/restore from the storage, check this first.

Returns
Boolean

true if it should persist the value