getPreloadSize
abstract fun getPreloadSize( item: T, adapterPosition: Int, perItemPosition: Int): Array<Int>
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Returns the size of the view in the list where the resources will be displayed in pixels in the format [x, y], or null if no size is currently available.
Note - The dimensions returned here must precisely match those of the view in the list.
If this method returns null, then no request will be started for the given item.
Parameters
item
A model