belongs to Maven artifact com.android.support:recyclerview-v7:28.0.0-alpha1
GridLayoutManager.SpanSizeLookup
public
static
abstract
class
GridLayoutManager.SpanSizeLookup
extends Object
java.lang.Object | |
↳ | android.support.v7.widget.GridLayoutManager.SpanSizeLookup |
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A helper class to provide the number of spans each item occupies.
Default implementation sets each item to occupy exactly 1 span.
See also:
Summary
Public constructors | |
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GridLayoutManager.SpanSizeLookup()
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Public methods | |
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int
|
getSpanGroupIndex(int adapterPosition, int spanCount)
Returns the index of the group this position belongs. |
int
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getSpanIndex(int position, int spanCount)
Returns the final span index of the provided position. |
abstract
int
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getSpanSize(int position)
Returns the number of span occupied by the item at |
void
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invalidateSpanIndexCache()
Clears the span index cache. |
boolean
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isSpanIndexCacheEnabled()
Returns whether results of |
void
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setSpanIndexCacheEnabled(boolean cacheSpanIndices)
Sets whether the results of |
Inherited methods | |
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java.lang.Object
|
Public constructors
Public methods
getSpanGroupIndex
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 | |
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adapterPosition |
int : The position in adapter |
spanCount |
int : The total number of spans in the grid |
Returns | |
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int |
The index of the span group including the item at the given adapter position |
getSpanIndex
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
(