NestedScrollingWebView

Nested Scrolling support for Android WebView

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NestedScrollingWebView is-a WebView that implements NestedScrollingChild.

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

1. Scrollable
2. Zoomable
3. Supporting nested scrolling

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.

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

Video:

(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

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