GridLayoutManagersetSpanSizeLookupSpanSizeLookup

GridLayoutManager is a class in the Android Jetpack library's RecyclerView component. It is a LayoutManager that arranges items in a grid. A GridLayoutManager allows you to create a grid of items where each item occupies a specified number of columns. This is useful for displaying content like photos in a gallery or items in a shop.

When you initialize a GridLayoutManager, you typically specify the number of columns the grid should have. The RecyclerView then automatically distributes the items across these columns. If you have a large number of items, the GridLayoutManager will efficiently scroll them. You can also configure the orientation of the grid, choosing between vertical or horizontal scrolling.

A key feature of GridLayoutManager is its ability to handle varying item spans. You can make individual items span across multiple columns, which is useful for creating layouts where some items are larger or more prominent than others. This is achieved by defining a custom span size for those specific items. The GridLayoutManager works in conjunction with a SpanSizeLookup to determine how many columns each item should span. This flexibility makes it a powerful tool for creating diverse and visually appealing grid-based user interfaces in Android applications.