What is the recycling mechanism in Android’s RecyclerView?

In Android, the RecyclerView is an efficient list view widget that reduces memory consumption and improves performance by reusing previously created views.

The reusing mechanism of RecyclerView is mainly implemented through ViewHolder. ViewHolder is an internal class used to hold references to the views of list items. When a list item view scrolls off the screen, the view will be recycled and stored in the Recycler, while the ViewHolder will be retained. When a new list item needs to be displayed, RecyclerView will first retrieve a ViewHolder from the Recycler, then bind the new data to the views within that ViewHolder, and finally hand over the ViewHolder to the LayoutManager for display.

By doing this, RecyclerView is able to efficiently reuse already created views, reducing the cost of creating and destroying views, and improving the performance and smoothness of the list.