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SortedList.Callback

public static abstract class SortedList.Callback
extends Object implements Comparator<T2>

java.lang.Object
↳	android.support.v7.util.SortedList.Callback<T2>

Known Direct Subclasses

SortedList.BatchedCallback<T2>, SortedListAdapterCallback<T2>

The class that controls the behavior of the SortedList.

It defines how items should be sorted and how duplicates should be handled.

SortedList calls the callback methods on this class to notify changes about the underlying data.

Summary

Public constructors
`SortedList.Callback()`

Public methods
`abstract boolean`	`areContentsTheSame(T2 oldItem, T2 newItem)` Called by the SortedList when it wants to check whether two items have the same data or not.
`abstract boolean`	`areItemsTheSame(T2 item1, T2 item2)` Called by the SortedList to decide whether two object represent the same Item or not.
`abstract int`	`compare(T2 o1, T2 o2)` Similar to `compare(Object, Object)`, should compare two and return how they should be ordered.
`abstract void`	`onChanged(int position, int count)` Called by the SortedList when the item at the given position is updated.
`abstract void`	`onInserted(int position, int count)` Called by the SortedList when an item is inserted at the given position.
`abstract void`	`onMoved(int fromPosition, int toPosition)` Called by the SortedList when an item changes its position in the list.
`abstract void`	`onRemoved(int position, int count)` Called by the SortedList when an item is removed from the given position.

Inherited methods

From class


  
    java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

From interface


  
    java.util.Comparator

`abstract int`	`compare(T2 o1, T2 o2)` Compares its two arguments for order.
`static <T, U> Comparator<T2>`	`comparing(Function<? super T, ? extends U> keyExtractor, Comparator<? super U> keyComparator)` Accepts a function that extracts a sort key from a type `T`, and returns a `Comparator<T>` that compares by that sort key using the specified `Comparator`.
`static <T, U extends Comparable<? super U>> Comparator<T2>`	`comparing(Function<? super T, ? extends U> keyExtractor)` Accepts a function that extracts a `Comparable` sort key from a type `T`, and returns a `Comparator<T>` that compares by that sort key.
`static <T> Comparator<T2>`	`comparingDouble(ToDoubleFunction<? super T> keyExtractor)` Accepts a function that extracts a `double` sort key from a type `T`, and returns a `Comparator<T>` that compares by that sort key.
`static <T> Comparator<T2>`	`comparingInt(ToIntFunction<? super T> keyExtractor)` Accepts a function that extracts an `int` sort key from a type `T`, and returns a `Comparator<T>` that compares by that sort key.
`static <T> Comparator<T2>`	`comparingLong(ToLongFunction<? super T> keyExtractor)` Accepts a function that extracts a `long` sort key from a type `T`, and returns a `Comparator<T>` that compares by that sort key.
`abstract boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this comparator.
`static <T extends Comparable<? super T>> Comparator<T>`	`naturalOrder()` Returns a comparator that compares `Comparable` objects in natural order.
`static <T> Comparator<T2>`	`nullsFirst(Comparator<? super T> comparator)` Returns a null-friendly comparator that considers `null` to be less than non-null.
`static <T> Comparator<T2>`	`nullsLast(Comparator<? super T> comparator)` Returns a null-friendly comparator that considers `null` to be greater than non-null.
`static <T extends Comparable<? super T>> Comparator<T>`	`reverseOrder()` Returns a comparator that imposes the reverse of the natural ordering.
`default Comparator<T2>`	`reversed()` Returns a comparator that imposes the reverse ordering of this comparator.
`default <U extends Comparable<? super U>> Comparator<T2>`	`thenComparing(Function<? super T, ? extends U> keyExtractor)` Returns a lexicographic-order comparator with a function that extracts a `Comparable` sort key.
`default <U> Comparator<T2>`	`thenComparing(Function<? super T, ? extends U> keyExtractor, Comparator<? super U> keyComparator)` Returns a lexicographic-order comparator with a function that extracts a key to be compared with the given `Comparator`.
`default Comparator<T2>`	`thenComparing(Comparator<? super T> other)` Returns a lexicographic-order comparator with another comparator.
`default Comparator<T2>`	`thenComparingDouble(ToDoubleFunction<? super T> keyExtractor)` Returns a lexicographic-order comparator with a function that extracts a `double` sort key.
`default Comparator<T2>`	`thenComparingInt(ToIntFunction<? super T> keyExtractor)` Returns a lexicographic-order comparator with a function that extracts a `int` sort key.
`default Comparator<T2>`	`thenComparingLong(ToLongFunction<? super T> keyExtractor)` Returns a lexicographic-order comparator with a function that extracts a `long` sort key.

Public constructors

SortedList.Callback

SortedList.Callback ()

Public methods

areContentsTheSame

boolean areContentsTheSame (T2 oldItem, 
                T2 newItem)

Called by the SortedList when it wants to check whether two items have the same data or not. SortedList uses this information to decide whether it should call onChanged(int, int) or not.

SortedList uses this method to check equality instead of equals(Object) so that you can change its behavior depending on your UI.

For example, if you are using SortedList with a RecyclerView.Adapter, you should return whether the items' visual representations are the same or not.

Parameters
`oldItem`	`T2`: The previous representation of the object.
`newItem`	`T2`: The new object that replaces the previous one.

Returns
`boolean`	True if the contents of the items are the same or false if they are different.

areItemsTheSame

boolean areItemsTheSame (T2 item1, 
                T2 item2)

Called by the SortedList to decide whether two object represent the same Item or not.

For example, if your items have unique ids, this method should check their equality.

Parameters
`item1`	`T2`: The first item to check.
`item2`	`T2`: The second item to check.

Returns
`boolean`	True if the two items represent the same object or false if they are different.

compare

int compare (T2 o1, 
                T2 o2)

Similar to compare(Object, Object), should compare two and return how they should be ordered.

Parameters
`o1`	`T2`: The first object to compare.
`o2`	`T2`: The second object to compare.

Returns
`int`	a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.

onChanged

void onChanged (int position, 
                int count)

Called by the SortedList when the item at the given position is updated.

Parameters
`position`	`int`: The position of the item which has been updated.
`count`	`int`: The number of items which has changed.

onInserted

void onInserted (int position, 
                int count)

Called by the SortedList when an item is inserted at the given position.

Parameters
`position`	`int`: The position of the new item.
`count`	`int`: The number of items that have been added.

onMoved

void onMoved (int fromPosition, 
                int toPosition)

Called by the SortedList when an item changes its position in the list.

Parameters
`fromPosition`	`int`: The previous position of the item before the move.
`toPosition`	`int`: The new position of the item.

onRemoved

void onRemoved (int position, 
                int count)

Called by the SortedList when an item is removed from the given position.

Parameters
`position`	`int`: The position of the item which has been removed.
`count`	`int`: The number of items which have been removed.