android.support.v7.widget

Class SpanSizeLookup

java.lang.Object

GridLayoutManager.SpanSizeLookup

android.support.v7.widget.SpanSizeLookup

public class SpanSizeLookup
extends GridLayoutManager.SpanSizeLookup

Wrapper class around GridLayoutManager.SpanSizeLookup. This exposes an package-private method as public method used inside the library. Also it adds caching for GridLayoutManager.SpanSizeLookup#getSpanGroupIndex(int, int) method. This method os called often by the library hence the caching.

Constructor Summary

Constructors

Constructor and Description
SpanSizeLookup(Cache cache) Constructor to initialize the SpanSizeLookup class.

Method Summary

Modifier and Type	Method and Description
void	clearCache() When the adapter's data set changes, this method will be called to clear the cache.
int	getCachedSpanIndex(int position, int spanCount)
int	getSpanGroupIndex(int adapterPosition, int spanCount) Returns the index of the group this position belongs.
int	getSpanSize(int adapterPosition)
void	setAdapter(MultiViewAdapter multiViewAdapter) Attach the adapter to the SpanSizeLookup

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SpanSizeLookup

public SpanSizeLookup(Cache cache)

Constructor to initialize the SpanSizeLookup class.

Method Detail

clearCache

public void clearCache()

When the adapter's data set changes, this method will be called to clear the cache.

setAdapter

public void setAdapter(MultiViewAdapter multiViewAdapter)

Attach the adapter to the SpanSizeLookup

Parameters:

multiViewAdapter - Adapter to be attached

getSpanSize

public int getSpanSize(int adapterPosition)

getCachedSpanIndex

public int getCachedSpanIndex(int position,
                              int spanCount)

getSpanGroupIndex

public 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 - The position in adapter

spanCount - The total number of spans in the grid

Returns:

The index of the span group including the item at the given adapter position