added in version 24.1.0
belongs to Maven artifact com.android.support:preference-v7:28.0.0-alpha1

DropDownPreference

public class DropDownPreference
extends ListPreference

java.lang.Object
↳	android.support.v7.preference.Preference
	↳	android.support.v7.preference.DialogPreference
		↳	android.support.v7.preference.ListPreference
			↳	android.support.v7.preference.DropDownPreference

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

Summary

Inherited XML attributes

From class


  android.support.v7.preference.Preference

Inherited constants

From class


    android.support.v7.preference.Preference

Public constructors
`DropDownPreference(Context context)`
`DropDownPreference(Context context, AttributeSet attrs)`
`DropDownPreference(Context context, AttributeSet attrs, int defStyle)`
`DropDownPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)`

Public methods
`void`	`onBindViewHolder(PreferenceViewHolder view)` Binds the created View to the data for this Preference.
`void`	`setEntries(CharSequence[] entries)` Sets the human-readable entries to be shown in the list.
`void`	`setValueIndex(int index)` Sets the value to the given index from the entry values.

Protected methods
`ArrayAdapter`	`createAdapter()` By default, this class uses a simple `ArrayAdapter`.
`void`	`notifyChanged()` Should be called when the data of this `Preference` has changed.
`void`	`onClick()` Processes a click on the preference.

Inherited methods

From class


  
    android.support.v7.preference.ListPreference

`int`	`findIndexOfValue(String value)` Returns the index of the given value (in the entry values array).
`CharSequence[]`	`getEntries()` The list of entries to be shown in the list in subsequent dialogs.
`CharSequence`	`getEntry()` Returns the entry corresponding to the current value.
`CharSequence[]`	`getEntryValues()` Returns the array of values to be saved for the preference.
`CharSequence`	`getSummary()` Returns the summary of this ListPreference.
`String`	`getValue()` Returns the value of the key.
`Object`	`onGetDefaultValue(TypedArray a, int index)` Called when a Preference is being inflated and the default value attribute needs to be read.
`void`	`onRestoreInstanceState(Parcelable state)` 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.
`void`	`onSetInitialValue(boolean restoreValue, Object defaultValue)` Implement this to set the initial value of the Preference.
`void`	`setEntries(CharSequence[] entries)` Sets the human-readable entries to be shown in the list.
`void`	`setEntries(int entriesResId)`
`void`	`setEntryValues(int entryValuesResId)`
`void`	`setEntryValues(CharSequence[] entryValues)` The array to find the value to save for a preference when an entry from entries is selected.
`void`	`setSummary(CharSequence summary)` Sets the summary for this Preference with a CharSequence.
`void`	`setValue(String value)` Sets the value of the key.
`void`	`setValueIndex(int index)` Sets the value to the given index from the entry values.

From class


  
    android.support.v7.preference.DialogPreference

From class


  
    android.support.v7.preference.Preference

`boolean`	`callChangeListener(Object newValue)` Call this method after the user changes the preference, but before the internal state is set.
`int`	`compareTo(Preference another)` Compares Preference objects based on order (if set), otherwise alphabetically on the titles.
`Preference`	`findPreferenceInHierarchy(String key)` Finds a Preference in this hierarchy (the whole thing, even above/below your `PreferenceScreen` screen break) 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`.
`final 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(boolean defaultReturnValue)` Attempts to get a persisted `Boolean` if this Preference is persistent.
`float`	`getPersistedFloat(float defaultReturnValue)` Attempts to get a persisted `Float` if this Preference is persistent.
`int`	`getPersistedInt(int defaultReturnValue)` Attempts to get a persisted `Integer` if this Preference is persistent.
`long`	`getPersistedLong(long defaultReturnValue)` Attempts to get a persisted `Long` if this Preference is persistent.
`String`	`getPersistedString(String defaultReturnValue)` Attempts to get a persisted set of Strings if this Preference is persistent.
`Set<String>`	`getPersistedStringSet(Set<String> defaultReturnValue)` 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.
`CharSequence`	`getTitle()` Returns the title of this Preference.
`final 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`	`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`	`isSingleLineTitle()` Gets whether the title of this preference is constrained to a single line.
`final boolean`	`isVisible()` Checks whether this preference should be visible to the user in the list.
`void`	`notifyChanged()` Should be called when the data of this `Preference` has changed.
`void`	`notifyDependencyChange(boolean disableDependents)` Notifies any listening dependents of a change that affects the dependency.
`void`	`notifyHierarchyChanged()` Should be called when a Preference has been added/removed from this group, or the ordering should be re-evaluated.
`void`	`onAttached()` Called when the Preference hierarchy has been attached to the list of preferences.
`void`	`onAttachedToHierarchy(PreferenceManager preferenceManager)` Called when this Preference has been attached to a Preference hierarchy.
`void`	`onBindViewHolder(PreferenceViewHolder holder)` Binds the created View to the data for this Preference.
`void`	`onClick()` Processes a click on the preference.
`void`	`onDependencyChanged(Preference dependency, boolean disableDependent)` Called when the dependency changes.
`void`	`onDetached()` Called when the Preference hierarchy has been detached from the list of preferences.
`Object`	`onGetDefaultValue(TypedArray a, int index)` Called when a Preference is being inflated and the default value attribute needs to be read.
`void`	`onInitializeAccessibilityNodeInfo(AccessibilityNodeInfoCompat info)` Initializes an `AccessibilityNodeInfo` with information about the View for this Preference.
`void`	`onParentChanged(Preference parent, boolean disableChild)` Called when the implicit parent dependency changes.
`void`	`onPrepareForRemoval()` Called when this Preference is being removed from the hierarchy.
`void`	`onRestoreInstanceState(Parcelable state)` 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.
`void`	`onSetInitialValue(boolean restorePersistedValue, Object defaultValue)` Implement this to set the initial value of the Preference.
`Bundle`	`peekExtras()` Return the extras Bundle object associated with this preference, returning null if there is not currently one.
`boolean`	`persistBoolean(boolean value)` Attempts to persist a `Boolean` if this Preference is persistent.
`boolean`	`persistFloat(float value)` Attempts to persist a `Float` if this Preference is persistent.
`boolean`	`persistInt(int value)` Attempts to persist an `Integer` if this Preference is persistent.
`boolean`	`persistLong(long value)` Attempts to persist a `Long` if this Preference is persistent.
`boolean`	`persistString(String value)` Attempts to persist a `String` if this Preference is persistent.
`boolean`	`persistStringSet(Set<String> values)` Attempts to persist a set of Strings if this Preference is persistent.
`void`	`restoreHierarchyState(Bundle container)` Restore this Preference hierarchy's previously saved state from the given container.
`void`	`saveHierarchyState(Bundle container)` Store this Preference hierarchy's frozen state into the given container.
`void`	`setDefaultValue(Object defaultValue)` 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.
`void`	`setDependency(String dependencyKey)` Sets the key of a Preference that this Preference will depend on.
`void`	`setEnabled(boolean enabled)` Sets whether this Preference is enabled.
`void`	`setFragment(String fragment)` Sets the class name of a fragment to be shown when this Preference is clicked.
`void`	`setIcon(Drawable icon)` Sets the icon for this Preference with a Drawable.
`void`	`setIcon(int iconResId)` Sets the icon for this Preference with a resource ID.
`void`	`setIconSpaceReserved(boolean iconSpaceReserved)` Sets whether to reserve the space of this Preference icon view when no icon is provided.
`void`	`setIntent(Intent intent)` Sets an `Intent` to be used for `startActivity(Intent)` when this Preference is clicked.
`void`	`setKey(String key)` Sets the key for this Preference, which is used as a key to the `SharedPreferences` or `PreferenceDataStore`.
`void`	`setLayoutResource(int layoutResId)` Sets the layout resource that is inflated as the `View` to be shown for this Preference.
`void`	`setOnPreferenceChangeListener(Preference.OnPreferenceChangeListener onPreferenceChangeListener)` Sets the callback to be invoked when this Preference is changed by the user (but before the internal state has been updated).
`void`	`setOnPreferenceClickListener(Preference.OnPreferenceClickListener onPreferenceClickListener)` Sets the callback to be invoked when this Preference is clicked.
`void`	`setOrder(int order)` Sets the order of this Preference with respect to other Preference objects on the same level.
`void`	`setPersistent(boolean persistent)` Sets whether this Preference is persistent.
`void`	`setPreferenceDataStore(PreferenceDataStore dataStore)` Sets a `PreferenceDataStore` to be used by this Preference instead of using `SharedPreferences`.
`void`	`setSelectable(boolean selectable)` Sets whether this Preference is selectable.
`void`	`setShouldDisableView(boolean shouldDisableView)` Sets whether this Preference should disable its view when it gets disabled.
`void`	`setSingleLineTitle(boolean singleLineTitle)` Sets whether to constrain the title of this Preference to a single line instead of letting it wrap onto multiple lines.
`void`	`setSummary(CharSequence summary)` Sets the summary for this Preference with a CharSequence.
`void`	`setSummary(int summaryResId)` Sets the summary for this Preference with a resource ID.
`void`	`setTitle(CharSequence title)` Sets the title for this Preference with a CharSequence.
`void`	`setTitle(int titleResId)` Sets the title for this Preference with a resource ID.
`void`	`setViewId(int viewId)` Set the ID that will be assigned to the overall View representing this preference, once bound.
`final void`	`setVisible(boolean visible)` Sets whether this preference should be visible in the list.
`void`	`setWidgetLayoutResource(int widgetLayoutResId)` Sets the layout for the controllable widget portion of this Preference.
`boolean`	`shouldDisableDependents()` Checks whether this preference's dependents should currently be disabled.
`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()`

From class


  
    java.lang.Object

From interface


  
    java.lang.Comparable

Public constructors

DropDownPreference

added in version 24.1.0

DropDownPreference (Context context)

Parameters
`context`	`Context`

DropDownPreference

added in version 24.1.0

DropDownPreference (Context context, 
                AttributeSet attrs)

Parameters
`context`	`Context`
`attrs`	`AttributeSet`

DropDownPreference

added in version 24.1.0

DropDownPreference (Context context, 
                AttributeSet attrs, 
                int defStyle)

Parameters
`context`	`Context`
`attrs`	`AttributeSet`
`defStyle`	`int`

DropDownPreference

added in version 24.1.0

DropDownPreference (Context context, 
                AttributeSet attrs, 
                int defStyleAttr, 
                int defStyleRes)

Parameters
`context`	`Context`
`attrs`	`AttributeSet`
`defStyleAttr`	`int`
`defStyleRes`	`int`

Public methods

onBindViewHolder

added in version 24.1.0

void onBindViewHolder (PreferenceViewHolder view)

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
`view`	`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.

setEntries

added in version 24.1.0

void setEntries (CharSequence[] entries)

Sets the human-readable entries to be shown in the list. This will be shown in subsequent dialogs.

Each entry must have a corresponding index in setEntryValues(CharSequence[]).

Parameters
`entries`	`CharSequence`: The entries.

setValueIndex

added in version 24.1.0

void setValueIndex (int index)

Sets the value to the given index from the entry values.

Parameters
`index`	`int`: The index of the value to set.

Protected methods

createAdapter

added in version 24.1.0

ArrayAdapter createAdapter ()

By default, this class uses a simple ArrayAdapter. But if you need a more complicated ArrayAdapter, this method can be overridden to create a custom one.

Note: This method is called from the constructor. So, overridden methods will get called before any subclass initialization.

Returns
`ArrayAdapter`	The custom `ArrayAdapter` that needs to be used with this class.

notifyChanged

added in version 24.1.0

void notifyChanged ()

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

onClick

added in version 24.1.0

void onClick ()

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

DropDownPreference

Summary

Inherited XML attributes

Inherited constants

Public constructors

Public methods

Protected methods

Inherited methods

Public constructors

DropDownPreference

DropDownPreference

DropDownPreference

DropDownPreference

Public methods

onBindViewHolder

setEntries

setValueIndex

Protected methods

createAdapter

notifyChanged

onClick

Interfaces

Classes