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

Summary: Inherited Constants | Ctors | Methods | Inherited Methods | [Expand All]

ItemTouchHelper.SimpleCallback

public static abstract class ItemTouchHelper.SimpleCallback
extends ItemTouchHelper.Callback

java.lang.Object
↳	android.support.v7.widget.helper.ItemTouchHelper.Callback
	↳	android.support.v7.widget.helper.ItemTouchHelper.SimpleCallback

A simple wrapper to the default Callback which you can construct with drag and swipe directions and this class will handle the flag callbacks. You should still override onMove or onSwiped depending on your use case.

 ItemTouchHelper mIth = new ItemTouchHelper(
     new ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP | ItemTouchHelper.DOWN,
         ItemTouchHelper.LEFT) {
         public abstract boolean onMove(RecyclerView recyclerView,
             ViewHolder viewHolder, ViewHolder target) {
             final int fromPos = viewHolder.getAdapterPosition();
             final int toPos = target.getAdapterPosition();
             // move item in `fromPos` to `toPos` in adapter.
             return true;// true if moved, false otherwise
         }
         public void onSwiped(ViewHolder viewHolder, int direction) {
             // remove from adapter
         }
 });

Summary

Inherited constants

From class


    android.support.v7.widget.helper.ItemTouchHelper.Callback

Public constructors
`ItemTouchHelper.SimpleCallback(int dragDirs, int swipeDirs)` Creates a Callback for the given drag and swipe allowance.

Public methods
`int`	`getDragDirs(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder)` Returns the drag directions for the provided ViewHolder.
`int`	`getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder)` Should return a composite flag which defines the enabled move directions in each state (idle, swiping, dragging).
`int`	`getSwipeDirs(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder)` Returns the swipe directions for the provided ViewHolder.
`void`	`setDefaultDragDirs(int defaultDragDirs)` Updates the default drag directions.
`void`	`setDefaultSwipeDirs(int defaultSwipeDirs)` Updates the default swipe directions.

Inherited methods

From class


  
    android.support.v7.widget.helper.ItemTouchHelper.Callback

`boolean`	`canDropOver(RecyclerView recyclerView, RecyclerView.ViewHolder current, RecyclerView.ViewHolder target)` Return true if the current ViewHolder can be dropped over the the target ViewHolder.
`RecyclerView.ViewHolder`	`chooseDropTarget(RecyclerView.ViewHolder selected, List<RecyclerView.ViewHolder> dropTargets, int curX, int curY)` Called by ItemTouchHelper to select a drop target from the list of ViewHolders that are under the dragged View.
`void`	`clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder)` Called by the ItemTouchHelper when the user interaction with an element is over and it also completed its animation.
`int`	`convertToAbsoluteDirection(int flags, int layoutDirection)` Converts a given set of flags to absolution direction which means `START` and `END` are replaced with `LEFT` and `RIGHT` depending on the layout direction.
`static int`	`convertToRelativeDirection(int flags, int layoutDirection)` Replaces a movement direction with its relative version by taking layout direction into account.
`long`	`getAnimationDuration(RecyclerView recyclerView, int animationType, float animateDx, float animateDy)` Called by the ItemTouchHelper when user action finished on a ViewHolder and now the View will be animated to its final position.
`int`	`getBoundingBoxMargin()` When finding views under a dragged view, by default, ItemTouchHelper searches for views that overlap with the dragged View.
`static ItemTouchUIUtil`	`getDefaultUIUtil()` Returns the `ItemTouchUIUtil` that is used by the `ItemTouchHelper.Callback` class for visual changes on Views in response to user interactions.
`float`	`getMoveThreshold(RecyclerView.ViewHolder viewHolder)` Returns the fraction that the user should move the View to be considered as it is dragged.
`abstract int`	`getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder)` Should return a composite flag which defines the enabled move directions in each state (idle, swiping, dragging).
`float`	`getSwipeEscapeVelocity(float defaultValue)` Defines the minimum velocity which will be considered as a swipe action by the user.
`float`	`getSwipeThreshold(RecyclerView.ViewHolder viewHolder)` Returns the fraction that the user should move the View to be considered as swiped.
`float`	`getSwipeVelocityThreshold(float defaultValue)` Defines the maximum velocity ItemTouchHelper will ever calculate for pointer movements.
`int`	`interpolateOutOfBoundsScroll(RecyclerView recyclerView, int viewSize, int viewSizeOutOfBounds, int totalSize, long msSinceStartScroll)` Called by the ItemTouchHelper when user is dragging a view out of bounds.
`boolean`	`isItemViewSwipeEnabled()` Returns whether ItemTouchHelper should start a swipe operation if a pointer is swiped over the View.
`boolean`	`isLongPressDragEnabled()` Returns whether ItemTouchHelper should start a drag and drop operation if an item is long pressed.
`static int`	`makeFlag(int actionState, int directions)` Shifts the given direction flags to the offset of the given action state.
`static int`	`makeMovementFlags(int dragFlags, int swipeFlags)` Convenience method to create movement flags.
`void`	`onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive)` Called by ItemTouchHelper on RecyclerView's onDraw callback.
`void`	`onChildDrawOver(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive)` Called by ItemTouchHelper on RecyclerView's onDraw callback.
`abstract boolean`	`onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target)` Called when ItemTouchHelper wants to move the dragged item from its old position to the new position.
`void`	`onMoved(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, int fromPos, RecyclerView.ViewHolder target, int toPos, int x, int y)` Called when `onMove(RecyclerView, ViewHolder, ViewHolder)` returns true.
`void`	`onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState)` Called when the ViewHolder swiped or dragged by the ItemTouchHelper is changed.
`abstract void`	`onSwiped(RecyclerView.ViewHolder viewHolder, int direction)` Called when a ViewHolder is swiped by the user.

From class


  
    java.lang.Object

Public constructors

ItemTouchHelper.SimpleCallback

added in version 24.1.0

ItemTouchHelper.SimpleCallback (int dragDirs, 
                int swipeDirs)

Creates a Callback for the given drag and swipe allowance. These values serve as defaults and if you want to customize behavior per ViewHolder, you can override getSwipeDirs(RecyclerView, ViewHolder) and / or getDragDirs(RecyclerView, ViewHolder).

Parameters
`dragDirs`	`int`: Binary OR of direction flags in which the Views can be dragged. Must be composed of `LEFT`, `RIGHT`, `START`, `END`, `UP` and `DOWN`.
`swipeDirs`	`int`: Binary OR of direction flags in which the Views can be swiped. Must be composed of `LEFT`, `RIGHT`, `START`, `END`, `UP` and `DOWN`.

Public methods

getDragDirs

added in version 24.1.0

int getDragDirs (RecyclerView recyclerView, 
                RecyclerView.ViewHolder viewHolder)

Returns the drag directions for the provided ViewHolder. Default implementation returns the drag directions that was set via constructor or setDefaultDragDirs(int).

Parameters
`recyclerView`	`RecyclerView`: The RecyclerView to which the ItemTouchHelper is attached to.
`viewHolder`	`RecyclerView.ViewHolder`: The ViewHolder for which the swipe direction is queried.

Returns
`int`	A binary OR of direction flags.

getMovementFlags

added in version 24.1.0

int getMovementFlags (RecyclerView recyclerView, 
                RecyclerView.ViewHolder viewHolder)

Should return a composite flag which defines the enabled move directions in each state (idle, swiping, dragging).

Instead of composing this flag manually, you can use makeMovementFlags(int, int) or makeFlag(int, int).

This flag is composed of 3 sets of 8 bits, where first 8 bits are for IDLE state, next 8 bits are for SWIPE state and third 8 bits are for DRAG state. Each 8 bit sections can be constructed by simply OR'ing direction flags defined in ItemTouchHelper.

For example, if you want it to allow swiping LEFT and RIGHT but only allow starting to swipe by swiping RIGHT, you can return:

      makeFlag(ACTION_STATE_IDLE, RIGHT) | makeFlag(ACTION_STATE_SWIPE, LEFT | RIGHT);

This means, allow right movement while IDLE and allow right and left movement while swiping.

Parameters
`recyclerView`	`RecyclerView`: The RecyclerView to which ItemTouchHelper is attached.