# ItemTouchHelper.SimpleCallback
# ItemTouchHelper.SimpleCallback
Artifact:[androidx.recyclerview:recyclerview](https://developer.android.com/jetpack/androidx/releases/recyclerview)
[View Source](https://cs.android.com/search?q=file:androidx/recyclerview/widget/ItemTouchHelper.java+class:androidx.recyclerview.widget.ItemTouchHelper.SimpleCallback)
Added in[1.0.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.0.0)
*** ** * ** ***
Kotlin\|[Java](https://developer.android.com/reference/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback "View this page in Java")
```
abstract class ItemTouchHelper.SimpleCallback : ItemTouchHelper.Callback
```
|---|---|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [kotlin.Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html) |||
| ↳ | [androidx.recyclerview.widget.ItemTouchHelper.Callback](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback) ||
| | ↳ | [androidx.recyclerview.widget.ItemTouchHelper.SimpleCallback](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/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.
```kotlin
ItemTouchHelper mIth = new ItemTouchHelper(
new ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP | ItemTouchHelper.DOWN,
ItemTouchHelper.LEFT) {
public 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
| ### Public constructors |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [SimpleCallback](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback#SimpleCallback(int,int))`(dragDirs: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, swipeDirs: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Creates a Callback for the given drag and swipe allowance. |
| ### Public functions |
|-------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [getDragDirs](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback#getDragDirs(androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder))`(` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder) `)` Returns the drag directions for the provided ViewHolder. |
| [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [getMovementFlags](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback#getMovementFlags(androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder))`(` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder) `)` Should return a composite flag which defines the enabled move directions in each state (idle, swiping, dragging). |
| [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [getSwipeDirs](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback#getSwipeDirs(androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder))`(` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder) `)` Returns the swipe directions for the provided ViewHolder. |
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [setDefaultDragDirs](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback#setDefaultDragDirs(int))`(defaultDragDirs: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Updates the default drag directions. |
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [setDefaultSwipeDirs](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback#setDefaultSwipeDirs(int))`(defaultSwipeDirs: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Updates the default swipe directions. |
| ### Inherited Constants |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| From[androidx.recyclerview.widget.ItemTouchHelper.Callback](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback) |-------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `const `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [DEFAULT_DRAG_ANIMATION_DURATION](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#DEFAULT_DRAG_ANIMATION_DURATION())` = 200` | | `const `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [DEFAULT_SWIPE_ANIMATION_DURATION](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#DEFAULT_SWIPE_ANIMATION_DURATION())` = 250` | |
| ### Inherited functions |
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------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| From[androidx.recyclerview.widget.ItemTouchHelper.Callback](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback) |-----------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [canDropOver](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#canDropOver(androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ViewHolder))`(` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` current: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` target: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder) `)` Return true if the current ViewHolder can be dropped over the the target ViewHolder. | | [RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!` | [chooseDropTarget](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#chooseDropTarget(androidx.recyclerview.widget.RecyclerView.ViewHolder,java.util.List,int,int))`(` ` selected: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` dropTargets: (`[Mutable](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-mutable-list/index.html)`)`[List](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-list/index.html)`<`[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!>,` ` curX: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` curY: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) `)` Called by ItemTouchHelper to select a drop target from the list of ViewHolders that are under the dragged View. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [clearView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#clearView(androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder))`(` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder) `)` Called by the ItemTouchHelper when the user interaction with an element is over and it also completed its animation. | | [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [convertToAbsoluteDirection](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#convertToAbsoluteDirection(int,int))`(flags: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, layoutDirection: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Converts a given set of flags to absolution direction which means[START](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#START())and[END](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#END())are replaced with[LEFT](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#LEFT())and[RIGHT](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#RIGHT())depending on the layout direction. | | `java-static `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [convertToRelativeDirection](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#convertToRelativeDirection(int,int))`(flags: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, layoutDirection: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Replaces a movement direction with its relative version by taking layout direction into account. | | [Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html) | [getAnimationDuration](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#getAnimationDuration(androidx.recyclerview.widget.RecyclerView,int,float,float))`(` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` animationType: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` animateDx: `[Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)`,` ` animateDy: `[Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html) `)` Called by the ItemTouchHelper when user action finished on a ViewHolder and now the View will be animated to its final position. | | [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [getBoundingBoxMargin](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#getBoundingBoxMargin())`()` When finding views under a dragged view, by default, ItemTouchHelper searches for views that overlap with the dragged View. | | `java-static `[ItemTouchUIUtil](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchUIUtil) | [getDefaultUIUtil](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#getDefaultUIUtil())`()` Returns the[ItemTouchUIUtil](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchUIUtil)that is used by the[Callback](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback)class for visual changes on Views in response to user interactions. | | [Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html) | [getMoveThreshold](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#getMoveThreshold(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`)` Returns the fraction that the user should move the View to be considered as it is dragged. | | [Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html) | [getSwipeEscapeVelocity](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#getSwipeEscapeVelocity(float))`(defaultValue: `[Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)`)` Defines the minimum velocity which will be considered as a swipe action by the user. | | [Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html) | [getSwipeThreshold](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#getSwipeThreshold(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`)` Returns the fraction that the user should move the View to be considered as swiped. | | [Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html) | [getSwipeVelocityThreshold](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#getSwipeVelocityThreshold(float))`(defaultValue: `[Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)`)` Defines the maximum velocity ItemTouchHelper will ever calculate for pointer movements. | | [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [interpolateOutOfBoundsScroll](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#interpolateOutOfBoundsScroll(androidx.recyclerview.widget.RecyclerView,int,int,int,long))`(` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` viewSize: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` viewSizeOutOfBounds: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` totalSize: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` msSinceStartScroll: `[Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html) `)` Called by the ItemTouchHelper when user is dragging a view out of bounds. | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [isItemViewSwipeEnabled](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#isItemViewSwipeEnabled())`()` Returns whether ItemTouchHelper should start a swipe operation if a pointer is swiped over the View. | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [isLongPressDragEnabled](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#isLongPressDragEnabled())`()` Returns whether ItemTouchHelper should start a drag and drop operation if an item is long pressed. | | `java-static `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [makeFlag](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#makeFlag(int,int))`(actionState: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, directions: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Shifts the given direction flags to the offset of the given action state. | | `java-static `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [makeMovementFlags](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#makeMovementFlags(int,int))`(dragFlags: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, swipeFlags: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Convenience method to create movement flags. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onChildDraw](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#onChildDraw(android.graphics.Canvas,androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder,float,float,int,boolean))`(` ` c: `[Canvas](https://developer.android.com/reference/android/graphics/Canvas.html)`,` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` dX: `[Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)`,` ` dY: `[Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)`,` ` actionState: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` isCurrentlyActive: `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) `)` Called by ItemTouchHelper on RecyclerView's onDraw callback. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onChildDrawOver](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#onChildDrawOver(android.graphics.Canvas,androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder,float,float,int,boolean))`(` ` c: `[Canvas](https://developer.android.com/reference/android/graphics/Canvas.html)`,` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!,` ` dX: `[Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)`,` ` dY: `[Float](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)`,` ` actionState: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` isCurrentlyActive: `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) `)` Called by ItemTouchHelper on RecyclerView's onDraw callback. | | `abstract `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [onMove](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#onMove(androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ViewHolder))`(` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` target: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder) `)` Called when ItemTouchHelper wants to move the dragged item from its old position to the new position. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onMoved](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#onMoved(androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder,int,androidx.recyclerview.widget.RecyclerView.ViewHolder,int,int,int))`(` ` recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView)`,` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` fromPos: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` target: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` toPos: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` x: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` y: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) `)` Called when[onMove](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#onMove(androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ViewHolder))returns true. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onSelectedChanged](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#onSelectedChanged(androidx.recyclerview.widget.RecyclerView.ViewHolder,int))`(viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`?, actionState: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Called when the ViewHolder swiped or dragged by the ItemTouchHelper is changed. | | `abstract `[Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onSwiped](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#onSwiped(androidx.recyclerview.widget.RecyclerView.ViewHolder,int))`(viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`, direction: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Called when a ViewHolder is swiped by the user. | |
## Public constructors
### SimpleCallback
Added in[1.0.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.0.0)
```
SimpleCallback(dragDirs: Int, swipeDirs: Int)
```
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](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback#getSwipeDirs(androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder))and / or[getDragDirs](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback#getDragDirs(androidx.recyclerview.widget.RecyclerView,androidx.recyclerview.widget.RecyclerView.ViewHolder)).
| Parameters |
|------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `dragDirs: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | Binary OR of direction flags in which the Views can be dragged. Must be composed of[LEFT](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#LEFT()),[RIGHT](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#RIGHT()),[START](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#START()),[END](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#END()),[UP](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#UP())and[DOWN](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#DOWN()). |
| `swipeDirs: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | Binary OR of direction flags in which the Views can be swiped. Must be composed of[LEFT](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#LEFT()),[RIGHT](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#RIGHT()),[START](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#START()),[END](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#END()),[UP](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#UP())and[DOWN](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper#DOWN()). |
## Public functions
### getDragDirs
Added in[1.0.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.0.0)
```
fun getDragDirs(
recyclerView: RecyclerView,
viewHolder: RecyclerView.ViewHolder
): Int
```
Returns the drag directions for the provided ViewHolder. Default implementation returns the drag directions that was set via constructor or[setDefaultDragDirs](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback#setDefaultDragDirs(int)).
| Parameters |
|----------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------|
| `recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView) | The RecyclerView to which the ItemTouchHelper is attached to. |
| `viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder) | The ViewHolder for which the swipe direction is queried. |
| Returns |
|-----------------------------------------------------------------------------|---------------------------------|
| [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | A binary OR of direction flags. |
### getMovementFlags
Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.4.0)
```
fun getMovementFlags(
recyclerView: RecyclerView,
viewHolder: RecyclerView.ViewHolder
): Int
```
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](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#makeMovementFlags(int,int))or[makeFlag](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#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](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/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:
```kotlin
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](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView) | The RecyclerView to which ItemTouchHelper is attached. |
| `viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder) | The ViewHolder for which the movement information is necessary. |
| Returns |
|-----------------------------------------------------------------------------|------------------------------------------------------------------|
| [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | flags specifying which movements are allowed on this ViewHolder. |
| See also |
|------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| [makeMovementFlags](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#makeMovementFlags(int,int)) | |
| [makeFlag](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.Callback#makeFlag(int,int)) | |
### getSwipeDirs
Added in[1.0.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.0.0)
```
fun getSwipeDirs(
recyclerView: RecyclerView,
viewHolder: RecyclerView.ViewHolder
): Int
```
Returns the swipe directions for the provided ViewHolder. Default implementation returns the swipe directions that was set via constructor or[setDefaultSwipeDirs](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/ItemTouchHelper.SimpleCallback#setDefaultSwipeDirs(int)).
| Parameters |
|----------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------|
| `recyclerView: `[RecyclerView](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView) | The RecyclerView to which the ItemTouchHelper is attached to. |
| `viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder) | The ViewHolder for which the swipe direction is queried. |
| Returns |
|-----------------------------------------------------------------------------|---------------------------------|
| [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | A binary OR of direction flags. |
### setDefaultDragDirs
Added in[1.0.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.0.0)
```
fun setDefaultDragDirs(defaultDragDirs: Int): Unit
```
Updates the default drag directions. For example, you can use this method to toggle certain directions depending on your use case.
| Parameters |
|------------------------------------------------------------------------------------------------|------------------------------------------------------------------|
| `defaultDragDirs: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | Binary OR of directions in which the ViewHolders can be dragged. |
### setDefaultSwipeDirs
Added in[1.0.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.0.0)
```
fun setDefaultSwipeDirs(defaultSwipeDirs: Int): Unit
```
Updates the default swipe directions. For example, you can use this method to toggle certain directions depending on your use case.
| Parameters |
|-------------------------------------------------------------------------------------------------|-----------------------------------------------------------------|
| `defaultSwipeDirs: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | Binary OR of directions in which the ViewHolders can be swiped. |