NestedScrollingWebView

Nested Scrolling support for Android WebView

NestedScrollingWebView is-a WebView that implements NestedScrollingChild.

It is useful for purposes where WebView is required to be:

Example: Hiding the toolbar upon scroll (Issue-14991).

Why: There is no default way to reliably support all the 3 aforementioned behaviors as:

Using NestedScrollView interferes with the zoom (Issue-16135).
Intercepting the scale motion events from NestedScrollView and passing it to WebView is unreliable.
Hiding the toolbar by detecting scroll is unreliable.
Workarounds for ensuring reliable zoom behavior interferes with scrolling.
Methods allowing consistent scroll and zoom behavior are not reliable for hiding toolbar.

Usage: Refer the example app in the repo.

WebView.setNestedScrollingEnabled must be set to true. (Example)
XML: <com.deysak.nestedscrollingwebview.NestedScrollingWebView ... /> (Example)

(A) Infinite Scroll after zoom:

NestedScrollingWebView ✨

new-scroll.mp4

Bug 🐞

old-infinite-scroll.mp4

(B) Unreliable Zoom:

NestedScrollingWebView ✨

new-zoom.mp4

Bug 🐞

Notice that I am trying to zoom at start, but it isn't zooming in.

old-buggy-zoom.mp4

So far it has been only tested for the purpose of collapsible toolbar, while allowing for reliable zoom and scroll functionality.

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