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ItemTouchHelper

open class ItemTouchHelper : RecyclerView.ItemDecoration, RecyclerView.OnChildAttachStateChangeListener
kotlin.Any
   ↳ androidx.recyclerview.widget.RecyclerView.ItemDecoration
   ↳ androidx.recyclerview.widget.ItemTouchHelper

This is a utility class to add swipe to dismiss and drag & drop support to RecyclerView.

It works with a RecyclerView and a Callback class, which configures what type of interactions are enabled and also receives events when user performs these actions.

Depending on which functionality you support, you should override Callback#onMove(RecyclerView, ViewHolder, ViewHolder) and / or Callback#onSwiped(ViewHolder, int).

This class is designed to work with any LayoutManager but for certain situations, it can be optimized for your custom LayoutManager by extending methods in the ItemTouchHelper.Callback class or implementing ItemTouchHelper.ViewDropHandler interface in your LayoutManager.

By default, ItemTouchHelper moves the items' translateX/Y properties to reposition them. You can customize these behaviors by overriding Callback#onChildDraw(Canvas, RecyclerView, * ViewHolder, float, float, int, boolean) or Callback#onChildDrawOver(Canvas, RecyclerView, ViewHolder, float, float, int, * boolean).

Most of the time you only need to override onChildDraw.

Summary

Nested classes
abstract

This class is the contract between ItemTouchHelper and your application.

abstract

A simple wrapper to the default Callback which you can construct with drag and swipe directions and this class will handle the flag callbacks.

abstract

An interface which can be implemented by LayoutManager for better integration with ItemTouchHelper.

Constants
static Int

A View is currently being dragged.

static Int

ItemTouchHelper is in idle state.

static Int

A View is currently being swiped.

static Int

Animation type for views that were dragged and now will animate to their final position.

static Int

Animation type for views which are not completely swiped thus will animate back to their original position.

static Int

Animation type for views which are swiped successfully.

static Int

Down direction, used for swipe & drag control.

static Int

Horizontal end direction.

static Int

Left direction, used for swipe & drag control.

static Int

Right direction, used for swipe & drag control.

static Int

Horizontal start direction.

static Int

Up direction, used for swipe & drag control.

Public constructors
<init>(@NonNull callback: ItemTouchHelper.Callback)

Creates an ItemTouchHelper that will work with the given Callback.

Public methods
open Unit
attachToRecyclerView(@Nullable recyclerView: RecyclerView?)

Attaches the ItemTouchHelper to the provided RecyclerView.

open Unit
getItemOffsets(outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State)

open Unit

open Unit

open Unit

open Unit

open Unit
startDrag(@NonNull viewHolder: RecyclerView.ViewHolder)

Starts dragging the provided ViewHolder.

open Unit
startSwipe(@NonNull viewHolder: RecyclerView.ViewHolder)

Starts swiping the provided ViewHolder.

Inherited functions