# ksoichiro/Android-ObservableScrollView

Android library to observe scroll events on scrollable views.

Repository: https://github.com/ksoichiro/Android-ObservableScrollView
Canonical: https://ross.abutalabs.com/products/android-observablescrollview
Homepage: http://ksoichiro.github.io/Android-ObservableScrollView/
Language: Java
License: Apache-2.0
License Family: permissive
Topics: android, android-library, android-ui, material-design
Last push: 2021-06-01T03:54:51+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4316, "days_push": 1919, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 9608, forks 2037 (observed 2026-08-28T04:10:36.220390+00:00)

## What it is
An Android library that lets developers observe scroll events on scrollable views like ListView and ScrollView. It provides callbacks for implementing Material Design-style animations, such as hiding or showing the Toolbar on scroll.

## Use cases
- hide toolbar when scrolling a list
- implement material design scroll animations on android
- observe scroll events in listview or scrollview
- parallax header effect while scrolling
- show action bar on scroll up
- sync toolbar with scroll position

## When to choose
- building a legacy Android app with Material Design scroll interactions
- you need scroll callbacks for ListView, ScrollView, or WebView on older Android APIs
- you want a lightweight Java library for toolbar-on-scroll effects

## When to avoid
- starting a new project with AndroidX, which has built-in CoordinatorLayout/AppBarLayout scroll behaviors
- you need Kotlin-first or Jetpack Compose scroll handling
- you require actively maintained libraries with recent updates

## Facets
- artifact type: library
- maturity: maintenance
- function: ui-components, animation
- domain: mobile-development, android-tools, web-design
- platform: jvm
- tags: scroll-events, material-design, toolbar-interaction, scrollable-views, ui-animation, android, mobile

## Member repositories
- ksoichiro/Android-ObservableScrollView (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:36.220390+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:21:53.007828+00:00, confidence not recorded.
  - readme: https://github.com/ksoichiro/Android-ObservableScrollView (fetched 2026-08-28T04:10:36.220390+00:00, sha 082e867b6f7f)
  - homepage: http://ksoichiro.github.io/Android-ObservableScrollView/ (fetched 2026-08-29T08:21:19.721201+00:00, sha 49d427d7370a)
- Data as of 2026-08-30T08:39:29.467469+00:00.