Summary: Ctors | Methods | Inherited Methods

SelectionTracker.SelectionPredicate

Kotlin |Java

public static abstract class SelectionTracker.SelectionPredicate
extends Object

java.lang.Object
↳	androidx.recyclerview.selection.SelectionTracker.SelectionPredicate<K>

Implement SelectionPredicate to control when items can be selected or unselected. See SelectionTracker.Builder.withSelectionPredicate(SelectionPredicate).

Summary

Public constructors
`SelectionPredicate()`

Public methods
`abstract boolean`	`canSelectMultiple()` Permits restriction to single selection mode.
`abstract boolean`	`canSetStateAtPosition(int position, boolean nextState)` Validates a change to selection for a specific position.
`abstract boolean`	`canSetStateForKey(K key, boolean nextState)` Validates a change to selection for a specific key.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()`
`boolean`	`equals(Object arg0)`
`void`	`finalize()`
`final Class<?>`	`getClass()`
`int`	`hashCode()`
`final void`	`notify()`
`final void`	`notifyAll()`
`String`	`toString()`
`final void`	`wait(long arg0, int arg1)`
`final void`	`wait(long arg0)`
`final void`	`wait()`

Public constructors

SelectionPredicate

public SelectionPredicate ()

Public methods

canSelectMultiple

public abstract boolean canSelectMultiple ()

Permits restriction to single selection mode. Single selection mode has unique behaviors in that it'll deselect an item already selected in order to select the new item.

In order to limit the number of items that can be selected, use canSetStateForKey(Object, boolean) and canSetStateAtPosition(int, boolean).

Returns
`boolean`	true if more than a single item can be selected.

canSetStateAtPosition

public abstract boolean canSetStateAtPosition (int position, 
                boolean nextState)

Validates a change to selection for a specific position. If necessary use ItemKeyProvider to identy associated key.

Parameters
`position`	`int`: the item position
`nextState`	`boolean`: the next potential selected/unselected state

Returns
`boolean`	true if the item at `id` can be set to `nextState`.

canSetStateForKey

public abstract boolean canSetStateForKey (K key, 
                boolean nextState)

Validates a change to selection for a specific key.

Parameters
`key`	`K`: the item key
`nextState`	`boolean`: the next potential selected/unselected state

Returns
`boolean`	true if the item at `id` can be set to `nextState`.