What is the caching mechanism of recyclerview?

The cache mechanism of RecyclerView mainly consists of two types: view cache and data cache.

1. View Cache: RecyclerView uses a class called ViewHolder to cache views so that they can be quickly reused during scrolling without the need for recreation. When a view scrolls off the screen, RecyclerView will place it in a recycled pool instead of immediately destroying it. When a new view is needed, RecyclerView will first look for a reusable view from the recycled pool. If found, it will be used directly; if not found, a new view will be created. This helps reduce the number of view creations and destructions, improving performance.
2. Data caching: RecyclerView utilizes a class called Adapter to manage data, which binds data with views. When the RecyclerView is scrolled, the Adapter will load corresponding data based on the currently visible view range and store it in memory. This helps to avoid repeatedly loading data from disk or network, ultimately improving response speed.

In general, the caching mechanism of RecyclerView improves performance by reusing views and caching data, reducing resource consumption. This mechanism is particularly effective in scenarios involving large amounts of data and fast scrolling.