For example, inĪn address book app, this might be the total number of addresses.
RecyclerView calls this method to get the size of the data set. The method might find the appropriate name in the list and fill in the view For example, if the RecyclerView displays a list of names, Method fetches the appropriate data and uses the data to fill in the view RecyclerView calls this method to associate a ViewHolder with data. ViewHolder and its associated View, but does not fill in the view'sĬontents-the ViewHolder has not yet been bound to specific data. RecyclerView calls this method whenever it When you define your adapter, you need to override three key methods: The process ofĪssociating views to their data is called binding. Objects as needed, and also sets the data for those views. Layout for an individual item in the list. The ViewHolder is a wrapper around a View that contains the These two classes work together to define how your data isĭisplayed. Once you've determined your layout, you need to implement your Adapter and Implementing your adapter and view holder Layout when you design the view holder, as described in the next section. You'll also need to design the layout of the individual items. In a row or column can end up offset from each other. Have the same width (for horizontal grids). Row have the same height (for vertical grids) or items in the same column Is similar to GridLayoutManager, but it does not require that items in a The elements in each column have the same width and height, but different
The items in your RecyclerView are arranged by aĬlass. Wrapper around a View, and that view is managed by RecyclerView.ĭefine the Adapter that associates your data with the ViewHolder views. Provides all the functionality for your list items. On this design, extend the ViewHolder class. You'll be able to use one of the RecyclerView library's standard layout managers.ĭesign how each element in the list is going to look and behave. They'll be discussed in detail in the following sections.įirst of all, decide what the list or grid is going to look like. If you're going to use RecyclerView, there are a few things you need to do.
You can see how all the pieces fit together in the RecyclerView sample app Layout managers are all based on the library's Use one of the layout managers provided by the RecyclerView library, or you canĭefine your own. The layout manager arranges the individual elements in your list. The RecyclerView requests those views, and binds the views to their data,īy calling methods in the adapter. The view holder is created, the RecyclerView binds it to its data. The view holder is created, it doesn't have any data associated with it. Into your layout the way you would add any other UI element.Įach individual element in the list is defined by a view holder object. It's a view itself, so you add RecyclerView Several different classes work together to build your dynamic list.Ĭorresponding to your data.
ANDROID STUDIO RECYCLERVIEW GRID LAYOUT MANAGER CODE
In this page, RecyclerView in code font always means the class Note: Besides being the name of the class, RecyclerView is also the name of Reuse vastly improves performance, improving your app's responsiveness and RecyclerView reuses the view for new items that have scrolled onscreen.
Item scrolls off the screen, RecyclerView doesn't destroy its view. The data and define how each item looks, and the RecyclerView libraryĭynamically creates the elements when they're needed.Īs the name implies, RecyclerView recycles those individual elements. RecyclerView makes it easy to efficiently display large sets of data.
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