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#Smoothscroll vs scroll android code
class CoolLayoutManager extends LinearLayoutManager return (SMOOTH_VALUE * firstPos) + heightOfScreen Ībove this code block, we must check if we are at the last item – if so, scroll to the end. We want smoothScrolling off so we can can add that to our LayoutManager’s constructor. There are several stock layout managers, but we are interested in the LinearLayoutManager. The LayoutManager is responsible for positioning items as well as recycling items in a RecyclerView. To adjust how the scrollbar behaves for every increment of scroll for the solution we pursued, we have to use a custom LayoutManager. We chose the first approach - its performance will always be better and can support updates to the content without remeasuring everything.īefore we can go deeper, let’s discuss the nomenclature for the various parts that make up a scrollbar.Įven with items only varying in height a small amount, the scrollbar thumb can be jarring. To accomplish this for a list of items with varying height, you must either create a custom layoutManager that estimates how the scrollbar should move for each user interaction, or that measures the entire list to calculate the size of each item before displaying it. To keep things performant, we want a scrollbar that can accurately and smoothly track the user’s position in a list of content without knowing the entire list. The scrollbar will not move smoothly – it will jump around and resize. Unfortunately, a scrollbar that doesn’t behave erratically is not well supported out of the box when working with dynamically-sized items in a RecyclerView.
#Smoothscroll vs scroll android android
It’s an important feature for a news publication to have, especially since articles have items varying in height, from one-line bylines to vertically-oriented images.Īs an Android developer on The Wall Street Journal, handling lists with content of varying heights is a common use case on Android. Scrolling in Android: Custom Scroll Behavior for a List of Varying HeightĪ scrollbar is a useful and recognizable way to show progress and position in a feed of content.