What is the difference between
NestedScrollView? Both of them, extend
FrameLayout. I want to know in depth pros and cons of both of them.
NestedScrollView as the name suggests is used when there is a need for a scrolling view inside another scrolling view. Normally this would be difficult to accomplish since the system would be unable to decide which view to scroll.
This is where
NestedScrollView comes in.
In addition to the nested scrolling
NestedScrollView added one major functionality, which could even make it interesting outside of nested contexts: It has build in support for
OnScrollChangeListener. Adding a
OnScrollChangeListener to the original
ScrollView below API 23 required subclassing
ScrollView or messing around with the
ViewTreeObserver of the
ScrollView which often means even more work than subclassing. With
NestedScrollView it can be done using the build-in setter.
NestedScrollView is just like ScrollView, but it supports acting as
both a nested scrolling parent and child on both new and old versions
of Android. Nested scrolling is enabled by default.
Layout container for a view hierarchy that can be scrolled by the
user, allowing it to be larger than the physical display. A
ScrollView is a FrameLayout, meaning you should place one child in it
containing the entire contents to scroll; this child may itself be a
layout manager with a complex hierarchy of objects
Other than the advantages listed in the answers given, one more advantage of NestedScrollView over ScrollView is its compatibility with CoordinatorLayout. The ScrollView does not cooperate with the CoordinatorLayout. You have to use NestedScrollView to get “scroll off-screen” behaviour for the toolbar.
NestedScrollView is just like ScrollView, but in NestedScrollView we can put other scrolling views as child of it, e.g. RecyclerView.
But if we put RecyclerView inside NestedScrollView, RecyclerView’s smooth scrolling is disturbed. So to bring back smooth scrolling there’s trick:
put above line after setting adapter for recyclerView.
I think one Benefit of using Nested Scroll view is that the cooridinator layout
only listens for nested scroll events. So if for ex. you want the toolbar to scroll down when you scroll you content of activity, it will only scroll down when you are using nested scroll view in your layout. If you use a normal scroll view in your layout, the toolbar wont scroll when the user scrolls the content.