lisawray/groupie

Groupie is an Android library that makes it easier to build scrollable lists with complex layouts. In Android development, scrollable lists are built using a component called RecyclerView, which requires you to write a fair amount of repetitive setup code: view types, view holders, position tracking, and change notifications. Groupie handles most of that boilerplate for you. The core idea is that you organize your content into Groups. A Group can be a single row (an Item), or a container that holds other groups, such as a Section with an optional header and footer. Groups can be nested inside other groups to any depth. When you add, remove, or update items within a group, Groupie automatically figures out what changed and notifies the list so it can animate the update correctly. You never have to calculate which position an item sits at or call notifyItemChanged manually. The library has a few built-in group types. Section is the most common: a list of body content with optional header and footer rows, and built-in support for diff-based updates that animate additions, removals, and moves. ExpandableGroup lets you show or hide a set of child items by tapping a parent row. For cases that do not fit those patterns, you can implement the Group interface yourself. At the item level, Groupie works with Android's view binding and data binding systems, so you can skip writing view holders entirely for new items. If you have existing ViewHolder code you want to keep, Groupie accommodates that too. The library supports both Kotlin and Java, and the README includes Gradle setup instructions and side-by-side code examples in both languages. It is distributed through JitPack.