material-components / material-components/material-components-android

[AppBarLayout] Lift on scroll doesn't work with inner BottomAppBar and hideOnScroll set to true

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bug Widget: TopAppBar
Dominant language
Java
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Description

**Description:** The AppBarLayout lift on scroll feature stops working when an inner BottomAppBar (in a fragment) has "hideOnScroll" set to true

**Expected behavior:** The AppBarLayout should get the lift on scroll color even when an inner BottomAppBar has hideOnScroll set to true

**Source code:**

activity_main.xml
```xml

```

fragment_main.xml, contained inside the FragmentContainerView

```xml

```

**Minimal sample app repro:** [Sample app](https://mega.nz/file/kABHQBbb#NDL3UoeFeW5RIZd2yX6B75px9Oc1PguY2jgFiRyJrkM)

**Android API version:** 33

**Material Library version:** 1.7.0

**Device:** Emulator AVD, Honor 70

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First steps

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by running the linked minimal sample app and compare activity_main.xml with fragment_main.xml, focusing on AppBarLayout liftOnScroll and the inner BottomAppBar's hideOnScroll setting. Reproduce the issue on the stated Android API 33 and Material Library 1.7.0 setup; done means the AppBarLayout receives its lift-on-scroll color while the inner BottomAppBar remains configured with hideOnScroll="true".

Written by the indexing model from the issue text.

Assessment

Tech stack
android
Domain
mobile
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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