void prepareForDrop (View view,
View target,
int x,
int y)
Called by the ItemTouchHelper after a View is dropped over another View.
A LayoutManager should implement this interface to get ready for the upcoming move
operation.
For example, LinearLayoutManager sets up a "scrollToPositionWithOffset" calls so that
the View under drag will be used as an anchor View while calculating the next layout,
making layout stay consistent.
Parameters
view
View: The View which is being dragged. It is very likely that user is still
dragging this View so there might be other calls to
prepareForDrop() after this one.
target
View: The target view which is being dropped on.
x
int: The left offset of the View that is being dragged. This value
includes the movement caused by the user.
y
int: The top offset of the View that is being dragged. This value
includes the movement caused by the user.
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Last updated 2025-02-10 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-10 UTC."],[],[],null,["# ItemTouchHelper.ViewDropHandler\n\nadded in [version 24.1.0](/topic/libraries/support-library/revisions) \nbelongs to Maven artifact com.android.support:recyclerview-v7:28.0.0-alpha1 \nSummary: [Methods](#pubmethods) \\| [\\[Expand All\\]](#) \n\nItemTouchHelper.ViewDropHandler\n===============================\n\n| This package is part of the Android [support library](/topic/libraries/support-library) which is no longer maintained. The support library has been superseded by [AndroidX](/jetpack/androidx) which is part of [Jetpack](/jetpack). We recommend using the AndroidX libraries in all new projects. You should also consider [migrating](/jetpack/androidx/migrate) existing projects to AndroidX. To find the AndroidX class that maps to this deprecated class, see the AndroidX support library [class\n| mappings](/jetpack/androidx/migrate/class-mappings).\n\n\n`\npublic\nstatic\n\n\ninterface\nItemTouchHelper.ViewDropHandler\n`\n\n\n`\n\n\n`\n\n|------------------------------------------------------------------|\n| android.support.v7.widget.helper.ItemTouchHelper.ViewDropHandler |\n\n|---|---|\n| Known Indirect Subclasses [GridLayoutManager](/reference/android/support/v7/widget/GridLayoutManager),[LinearLayoutManager](/reference/android/support/v7/widget/LinearLayoutManager),[WearableLinearLayoutManager](/reference/android/support/wear/widget/WearableLinearLayoutManager) |---------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [GridLayoutManager](/reference/android/support/v7/widget/GridLayoutManager) | A [RecyclerView.LayoutManager](/reference/android/support/v7/widget/RecyclerView.LayoutManager) implementations that lays out items in a grid. | | [LinearLayoutManager](/reference/android/support/v7/widget/LinearLayoutManager) | A [RecyclerView.LayoutManager](/reference/android/support/v7/widget/RecyclerView.LayoutManager) implementation which provides similar functionality to [ListView](https://developer.android.com/reference/android/widget/ListView.html). | | [WearableLinearLayoutManager](/reference/android/support/wear/widget/WearableLinearLayoutManager) | This wear-specific implementation of [LinearLayoutManager](/reference/android/support/v7/widget/LinearLayoutManager) provides basic offsetting logic for updating child layout. | ||\n\n\u003cbr /\u003e\n\n*** ** * ** ***\n\nAn interface which can be implemented by LayoutManager for better integration with\n[ItemTouchHelper](/reference/android/support/v7/widget/helper/ItemTouchHelper).\n\nSummary\n-------\n\n| ### Public methods ||\n|------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| ` abstract void` | ` `[prepareForDrop](/reference/android/support/v7/widget/helper/ItemTouchHelper.ViewDropHandler#prepareForDrop(android.view.View, android.view.View, int, int))`(`[View](https://developer.android.com/reference/android/view/View.html)` view, `[View](https://developer.android.com/reference/android/view/View.html)` target, int x, int y) ` Called by the [ItemTouchHelper](/reference/android/support/v7/widget/helper/ItemTouchHelper) after a View is dropped over another View. |\n\nPublic methods\n--------------\n\n### prepareForDrop\n\nadded in [version 24.1.0](/topic/libraries/support-library/revisions) \n\n```\nvoid prepareForDrop (View view, \n View target, \n int x, \n int y)\n```\n\nCalled by the [ItemTouchHelper](/reference/android/support/v7/widget/helper/ItemTouchHelper) after a View is dropped over another View.\n\n\nA LayoutManager should implement this interface to get ready for the upcoming move\noperation.\n\n\nFor example, LinearLayoutManager sets up a \"scrollToPositionWithOffset\" calls so that\nthe View under drag will be used as an anchor View while calculating the next layout,\nmaking layout stay consistent.\n\n\u003cbr /\u003e\n\n| Parameters ||\n|----------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `view` | `View`: The View which is being dragged. It is very likely that user is still dragging this View so there might be other calls to `prepareForDrop()` after this one. \u003cbr /\u003e |\n| `target` | `View`: The target view which is being dropped on. \u003cbr /\u003e |\n| `x` | `int`: The `left` offset of the View that is being dragged. This value includes the movement caused by the user. \u003cbr /\u003e |\n| `y` | `int`: The `top` offset of the View that is being dragged. This value includes the movement caused by the user. \u003cbr /\u003e |\n\n-\n\n Interfaces\n ----------\n\n - [ItemTouchHelper.ViewDropHandler](/reference/android/support/v7/widget/helper/ItemTouchHelper.ViewDropHandler)\n - [ItemTouchUIUtil](/reference/android/support/v7/widget/helper/ItemTouchUIUtil)\n-\n\n Classes\n -------\n\n - [ItemTouchHelper](/reference/android/support/v7/widget/helper/ItemTouchHelper)\n - [ItemTouchHelper.Callback](/reference/android/support/v7/widget/helper/ItemTouchHelper.Callback)\n - [ItemTouchHelper.SimpleCallback](/reference/android/support/v7/widget/helper/ItemTouchHelper.SimpleCallback)"]]
Known Indirect Subclasses