# GridLayoutManager.SpanSizeLookup added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) belongs to Maven artifact com.android.support:recyclerview-v7:28.0.0-alpha1 Summary:[Ctors](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#pubctors)\|[Methods](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#inhmethods)\|[\[Expand All\]](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#) # GridLayoutManager.SpanSizeLookup | This package is part of the Android[support library](https://developer.android.com/topic/libraries/support-library)which is no longer maintained. The support library has been superseded by[AndroidX](https://developer.android.com/jetpack/androidx)which is part of[Jetpack](https://developer.android.com/jetpack). We recommend using the AndroidX libraries in all new projects. You should also consider[migrating](https://developer.android.com/jetpack/androidx/migrate)existing projects to AndroidX. To find the AndroidX class that maps to this deprecated class, see the AndroidX support library[class mappings](https://developer.android.com/jetpack/androidx/migrate/class-mappings). ` public static abstract class GridLayoutManager.SpanSizeLookup ` ` extends Object `` ` |---|------------------------------------------------------------| | java.lang.Object || | ↳ | android.support.v7.widget.GridLayoutManager.SpanSizeLookup | |---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#)Known Direct Subclasses [GridLayoutManager.DefaultSpanSizeLookup](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.DefaultSpanSizeLookup) |------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [GridLayoutManager.DefaultSpanSizeLookup](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.DefaultSpanSizeLookup) | Default implementation for[GridLayoutManager.SpanSizeLookup](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup). | |
*** ** * ** *** A helper class to provide the number of spans each item occupies. Default implementation sets each item to occupy exactly 1 span. **See also:** - [setSpanSizeLookup(SpanSizeLookup)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager#setSpanSizeLookup(android.support.v7.widget.GridLayoutManager.SpanSizeLookup)) ## Summary | ### Public constructors || |-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---| | ` `[GridLayoutManager.SpanSizeLookup](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#GridLayoutManager.SpanSizeLookup())`() ` | | ### Public methods || |-----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` int` | ` `[getSpanGroupIndex](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#getSpanGroupIndex(int, int))`(int adapterPosition, int spanCount) ` Returns the index of the group this position belongs. | | ` int` | ` `[getSpanIndex](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#getSpanIndex(int, int))`(int position, int spanCount) ` Returns the final span index of the provided position. | | ` abstract int` | ` `[getSpanSize](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#getSpanSize(int))`(int position) ` Returns the number of span occupied by the item at`position`. | | ` void` | ` `[invalidateSpanIndexCache](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#invalidateSpanIndexCache())`() ` Clears the span index cache. | | ` boolean` | ` `[isSpanIndexCacheEnabled](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#isSpanIndexCacheEnabled())`() ` Returns whether results of[getSpanIndex(int, int)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#getSpanIndex(int, int))method are cached or not. | | ` void` | ` `[setSpanIndexCacheEnabled](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#setSpanIndexCacheEnabled(boolean))`(boolean cacheSpanIndices) ` Sets whether the results of[getSpanIndex(int, int)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#getSpanIndex(int, int))method should be cached or not. | | ### Inherited methods | |-----------------------|---| | [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#)From class` java.lang.Object ` |-------------------|-------------------------------| | ` Object` | ` clone() ` | | ` boolean` | ` equals(Object arg0) ` | | ` void` | ` finalize() ` | | ` final Class` | ` getClass() ` | | ` int` | ` hashCode() ` | | ` final void` | ` notify() ` | | ` final void` | ` notifyAll() ` | | ` String` | ` toString() ` | | ` final void` | ` wait(long arg0, int arg1) ` | | ` final void` | ` wait(long arg0) ` | | ` final void` | ` wait() ` | || ## Public constructors ### GridLayoutManager.SpanSizeLookup added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` GridLayoutManager.SpanSizeLookup () ```

## Public methods ### getSpanGroupIndex added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` int getSpanGroupIndex (int adapterPosition, int spanCount) ``` Returns the index of the group this position belongs. For example, if grid has 3 columns and each item occupies 1 span, span group index for item 1 will be 0, item 5 will be 1.
| Parameters || |-------------------|-----------------------------------------------------| | `adapterPosition` | `int`: The position in adapter
| | `spanCount` | `int`: The total number of spans in the grid
| | Returns || |-------|-------------------------------------------------------------------------------------| | `int` | The index of the span group including the item at the given adapter position
| ### getSpanIndex added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` int getSpanIndex (int position, int spanCount) ``` Returns the final span index of the provided position. If you have a faster way to calculate span index for your items, you should override this method. Otherwise, you should enable span index cache ([setSpanIndexCacheEnabled(boolean)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#setSpanIndexCacheEnabled(boolean))) for better performance. When caching is disabled, default implementation traverses all items from 0 to`position`. When caching is enabled, it calculates from the closest cached value before the`position`. If you override this method, you need to make sure it is consistent with[getSpanSize(int)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#getSpanSize(int)). GridLayoutManager does not call this method for each item. It is called only for the reference item and rest of the items are assigned to spans based on the reference item. For example, you cannot assign a position to span 2 while span 1 is empty. Note that span offsets always start with 0 and are not affected by RTL.
| Parameters || |-------------|-----------------------------------------------------| | `position` | `int`: The position of the item
| | `spanCount` | `int`: The total number of spans in the grid
| | Returns || |-------|-------------------------------------------------------------------------------------------------------| | `int` | The final span position of the item. Should be between 0 (inclusive) and`spanCount`(exclusive)
| ### getSpanSize added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` int getSpanSize (int position) ``` Returns the number of span occupied by the item at`position`.
| Parameters || |------------|------------------------------------------------| | `position` | `int`: The adapter position of the item
| | Returns || |-------|--------------------------------------------------------------------------| | `int` | The number of spans occupied by the item at the provided position
| ### invalidateSpanIndexCache added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void invalidateSpanIndexCache () ``` Clears the span index cache. GridLayoutManager automatically calls this method when adapter changes occur.
### isSpanIndexCacheEnabled added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` boolean isSpanIndexCacheEnabled () ``` Returns whether results of[getSpanIndex(int, int)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#getSpanIndex(int, int))method are cached or not.
| Returns || |-----------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `boolean` | True if results of[getSpanIndex(int, int)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#getSpanIndex(int, int))are cached.
| ### setSpanIndexCacheEnabled added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void setSpanIndexCacheEnabled (boolean cacheSpanIndices) ``` Sets whether the results of[getSpanIndex(int, int)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#getSpanIndex(int, int))method should be cached or not. By default these values are not cached. If you are not overriding[getSpanIndex(int, int)](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup#getSpanIndex(int, int)), you should set this to true for better performance.
| Parameters || |--------------------|----------------------------------------------------------------------------| | `cacheSpanIndices` | `boolean`: Whether results of getSpanIndex should be cached or not.
| - ## Annotations - [RecyclerView.EdgeEffectFactory.EdgeDirection](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.EdgeEffectFactory.EdgeDirection) - [RecyclerView.ItemAnimator.AdapterChanges](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.ItemAnimator.AdapterChanges) - ## Interfaces - [ActionMenuView.OnMenuItemClickListener](https://developer.android.com/reference/android/support/v7/widget/ActionMenuView.OnMenuItemClickListener) - [PopupMenu.OnDismissListener](https://developer.android.com/reference/android/support/v7/widget/PopupMenu.OnDismissListener) - [PopupMenu.OnMenuItemClickListener](https://developer.android.com/reference/android/support/v7/widget/PopupMenu.OnMenuItemClickListener) - [RecyclerView.ChildDrawingOrderCallback](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.ChildDrawingOrderCallback) - [RecyclerView.ItemAnimator.ItemAnimatorFinishedListener](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.ItemAnimator.ItemAnimatorFinishedListener) - [RecyclerView.LayoutManager.LayoutPrefetchRegistry](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.LayoutManager.LayoutPrefetchRegistry) - [RecyclerView.OnChildAttachStateChangeListener](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.OnChildAttachStateChangeListener) - [RecyclerView.OnItemTouchListener](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.OnItemTouchListener) - [RecyclerView.RecyclerListener](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.RecyclerListener) - [RecyclerView.SmoothScroller.ScrollVectorProvider](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.SmoothScroller.ScrollVectorProvider) - [SearchView.OnCloseListener](https://developer.android.com/reference/android/support/v7/widget/SearchView.OnCloseListener) - [SearchView.OnQueryTextListener](https://developer.android.com/reference/android/support/v7/widget/SearchView.OnQueryTextListener) - [SearchView.OnSuggestionListener](https://developer.android.com/reference/android/support/v7/widget/SearchView.OnSuggestionListener) - [ShareActionProvider.OnShareTargetSelectedListener](https://developer.android.com/reference/android/support/v7/widget/ShareActionProvider.OnShareTargetSelectedListener) - [ThemedSpinnerAdapter](https://developer.android.com/reference/android/support/v7/widget/ThemedSpinnerAdapter) - [Toolbar.OnMenuItemClickListener](https://developer.android.com/reference/android/support/v7/widget/Toolbar.OnMenuItemClickListener) - ## Classes - [ActionMenuView](https://developer.android.com/reference/android/support/v7/widget/ActionMenuView) - [ActionMenuView.LayoutParams](https://developer.android.com/reference/android/support/v7/widget/ActionMenuView.LayoutParams) - [AppCompatAutoCompleteTextView](https://developer.android.com/reference/android/support/v7/widget/AppCompatAutoCompleteTextView) - [AppCompatButton](https://developer.android.com/reference/android/support/v7/widget/AppCompatButton) - [AppCompatCheckBox](https://developer.android.com/reference/android/support/v7/widget/AppCompatCheckBox) - [AppCompatCheckedTextView](https://developer.android.com/reference/android/support/v7/widget/AppCompatCheckedTextView) - [AppCompatEditText](https://developer.android.com/reference/android/support/v7/widget/AppCompatEditText) - [AppCompatImageButton](https://developer.android.com/reference/android/support/v7/widget/AppCompatImageButton) - [AppCompatImageView](https://developer.android.com/reference/android/support/v7/widget/AppCompatImageView) - [AppCompatMultiAutoCompleteTextView](https://developer.android.com/reference/android/support/v7/widget/AppCompatMultiAutoCompleteTextView) - [AppCompatRadioButton](https://developer.android.com/reference/android/support/v7/widget/AppCompatRadioButton) - [AppCompatRatingBar](https://developer.android.com/reference/android/support/v7/widget/AppCompatRatingBar) - [AppCompatSeekBar](https://developer.android.com/reference/android/support/v7/widget/AppCompatSeekBar) - [AppCompatSpinner](https://developer.android.com/reference/android/support/v7/widget/AppCompatSpinner) - [AppCompatTextView](https://developer.android.com/reference/android/support/v7/widget/AppCompatTextView) - [CardView](https://developer.android.com/reference/android/support/v7/widget/CardView) - [DefaultItemAnimator](https://developer.android.com/reference/android/support/v7/widget/DefaultItemAnimator) - [DividerItemDecoration](https://developer.android.com/reference/android/support/v7/widget/DividerItemDecoration) - [GridLayout](https://developer.android.com/reference/android/support/v7/widget/GridLayout) - [GridLayout.Alignment](https://developer.android.com/reference/android/support/v7/widget/GridLayout.Alignment) - [GridLayout.LayoutParams](https://developer.android.com/reference/android/support/v7/widget/GridLayout.LayoutParams) - [GridLayout.Spec](https://developer.android.com/reference/android/support/v7/widget/GridLayout.Spec) - [GridLayoutManager](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager) - [GridLayoutManager.DefaultSpanSizeLookup](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.DefaultSpanSizeLookup) - [GridLayoutManager.LayoutParams](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.LayoutParams) - [GridLayoutManager.SpanSizeLookup](https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.SpanSizeLookup) - [LinearLayoutCompat](https://developer.android.com/reference/android/support/v7/widget/LinearLayoutCompat) - [LinearLayoutCompat.LayoutParams](https://developer.android.com/reference/android/support/v7/widget/LinearLayoutCompat.LayoutParams) - [LinearLayoutManager](https://developer.android.com/reference/android/support/v7/widget/LinearLayoutManager) - [LinearLayoutManager.LayoutChunkResult](https://developer.android.com/reference/android/support/v7/widget/LinearLayoutManager.LayoutChunkResult) - [LinearSmoothScroller](https://developer.android.com/reference/android/support/v7/widget/LinearSmoothScroller) - [LinearSnapHelper](https://developer.android.com/reference/android/support/v7/widget/LinearSnapHelper) - [ListPopupWindow](https://developer.android.com/reference/android/support/v7/widget/ListPopupWindow) - [OrientationHelper](https://developer.android.com/reference/android/support/v7/widget/OrientationHelper) - [PagerSnapHelper](https://developer.android.com/reference/android/support/v7/widget/PagerSnapHelper) - [PopupMenu](https://developer.android.com/reference/android/support/v7/widget/PopupMenu) - [RecyclerView](https://developer.android.com/reference/android/support/v7/widget/RecyclerView) - [RecyclerView.Adapter](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter) - [RecyclerView.AdapterDataObserver](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.AdapterDataObserver) - [RecyclerView.EdgeEffectFactory](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.EdgeEffectFactory) - [RecyclerView.ItemAnimator](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.ItemAnimator) - [RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.ItemAnimator.ItemHolderInfo) - [RecyclerView.ItemDecoration](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.ItemDecoration) - [RecyclerView.LayoutManager](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.LayoutManager) - [RecyclerView.LayoutManager.Properties](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.LayoutManager.Properties) - [RecyclerView.LayoutParams](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.LayoutParams) - [RecyclerView.OnFlingListener](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.OnFlingListener) - [RecyclerView.OnScrollListener](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.OnScrollListener) - [RecyclerView.RecycledViewPool](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.RecycledViewPool) - [RecyclerView.Recycler](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Recycler) - [RecyclerView.SimpleOnItemTouchListener](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.SimpleOnItemTouchListener) - [RecyclerView.SmoothScroller](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.SmoothScroller) - [RecyclerView.SmoothScroller.Action](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.SmoothScroller.Action) - [RecyclerView.State](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.State) - [RecyclerView.ViewCacheExtension](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.ViewCacheExtension) - [RecyclerView.ViewHolder](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.ViewHolder) - [RecyclerViewAccessibilityDelegate](https://developer.android.com/reference/android/support/v7/widget/RecyclerViewAccessibilityDelegate) - [RecyclerViewAccessibilityDelegate.ItemDelegate](https://developer.android.com/reference/android/support/v7/widget/RecyclerViewAccessibilityDelegate.ItemDelegate) - [SearchView](https://developer.android.com/reference/android/support/v7/widget/SearchView) - [ShareActionProvider](https://developer.android.com/reference/android/support/v7/widget/ShareActionProvider) - [SimpleItemAnimator](https://developer.android.com/reference/android/support/v7/widget/SimpleItemAnimator) - [SnapHelper](https://developer.android.com/reference/android/support/v7/widget/SnapHelper) - [StaggeredGridLayoutManager](https://developer.android.com/reference/android/support/v7/widget/StaggeredGridLayoutManager) - [StaggeredGridLayoutManager.LayoutParams](https://developer.android.com/reference/android/support/v7/widget/StaggeredGridLayoutManager.LayoutParams) - [SwitchCompat](https://developer.android.com/reference/android/support/v7/widget/SwitchCompat) - [ThemedSpinnerAdapter.Helper](https://developer.android.com/reference/android/support/v7/widget/ThemedSpinnerAdapter.Helper) - [Toolbar](https://developer.android.com/reference/android/support/v7/widget/Toolbar) - [Toolbar.LayoutParams](https://developer.android.com/reference/android/support/v7/widget/Toolbar.LayoutParams) - [Toolbar.SavedState](https://developer.android.com/reference/android/support/v7/widget/Toolbar.SavedState) - [TooltipCompat](https://developer.android.com/reference/android/support/v7/widget/TooltipCompat)