RecyclerView is a subclass of ViewGroup and is a more resource-efficient way to display scrollable lists. Instead of creating a View for each item that may or may not be visible on the screen, RecyclerView:

creates a limited number of list items and reuses them for visible content.

creates a single list item and reuses it for visible content.

creates an unlimited number of list items and never reuses them

creates a limited number of list items and reuses them for visible content.

creates a single list item and never reuses it

Android uses adapters (from the Adapter class) to connect data with View items in a list. There are many different kinds of adapters available, and you can also write custom adapters. To connect data with View items, the adapter needs to know about the View items. From what is extended the entity that is usually used in an adapter and describes a View item and its position within the RecyclerView?

RecyclerView.AdapterDataObserver

RecyclerViewAccessibilityDelegate

Google Associate Android Developer Practice Test 4 - Free Online Exam Prep & Questions

We have a custom view that extends android.widget.ProgressBar. Our progress bar is not touchable, focusable, etc.: it just shows progress. Style for our custom progress bar extends "Widget.AppCompat.ProgressBar.Horizontal". An item, named "progressDrawable", in our style, is a xml file . What we usually can see as a main single element in this xml file:

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Google Associate Android Developer Practice Test 4

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Google Associate Android Developer Practice Tests

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