Expose alternate method to calculate light mode and dark mode for enableEdgeToEdge [278263793]

Fixed

Feature Request

Status Update

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Description

va...@google.com

created issue #1

Apr 14, 2023 05:03PM

Component used: Activity

Version used: 1.8.0-alpha03

When trying out the new `enableEdgeToEdge` method, I ran into one slightly annoying aspect.

When apps have their own theme picker for choosing dark mode and light mode, the resulting UI them (light vs dark) that the app uses may differ from the system theme, as passed down via the `Configuration`.

`enableEdgeToEdge` always looks at the system theme via the `Configuration`, so there isn't a good way to have a different source of truth for choosing whether to show a dark or light theme.

It also doesn't directly work to have an `if` statement and call `SystemBarStyle.light` or `SystemBarStyle.dark`, because those don't have the transparent behavior that `SystemBarStyle.auto` does on API 29 and above.

Maybe `enableEdgeToEdge` could take an optional lambda for `isShowingDarkTheme`, with a default implementation that uses the `Configuration`.

Comments

jb...@google.com <jb...@google.com> Apr 14, 2023 05:58PM

Assigned to ya...@google.com.

ya...@google.com <ya...@google.com> #2Apr 19, 2023 04:03AM

Reassigned to va...@google.com.

Are there many use cases for this? The current logic works fine with dark mode of platform, appcompat, and Compose.

va...@google.com <va...@google.com> #3Jun 7, 2023 04:16AM

When I was trying out integrating this with Now in Android, I ran into this issue since Now in Android currently doesn't inherit from AppCompatActivity and doesn't call AppCompatDelegate.setDefaultNightMode, so maybe the solution is instead to inherit from AppCompatActivity instead of just ComponentActivity to update the underlying configuration.

ya...@google.com <ya...@google.com> #4Jun 7, 2023 05:00AM

I just tested it with ComponentActivity. It's working fine for me. The scrim for 3-button nav and the icons are properly changed on light/dark mode switch. The extension function detect light/dark mode from resources.configuration.uiMode which is commonly used by the platform, AppCompat, and Compose, so I don't know why it doesn't work. Can I take a look at what you tried in Now in Android.

Screen_recording_20230607_135618.webm

6.7 MB

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va...@google.com <va...@google.com> #5Jun 7, 2023 05:12AM

https://github.com/android/nowinandroid/tree/av/enable-edge-to-edge is the rough progress I made so far.

The theme switcher based on the user's preference within the app is handled separately from Configuration.uiMode and isn't updating the configuration directly, so I was attempting to call enableEdgeToEdge and manually specifying the dark and light themes.

The two options I see:

Allow a different way of specifying for enableEdgeToEdge whether the app is effectively in dark mode or light mode instead of that being based just on Configuration.uiMode (this issue)
Switch Now in Android to use AppCompatActivity and AppCompatDelegate.setDefaultNightMode so that the Configuration.uiMode is updated based on the user's preference

ya...@google.com <ya...@google.com> #6Jun 7, 2023 08:30AM

I see, so it has in-app light/dark setting.

On API 31+, apps with custom in-app light/dark settings should call UiModeManager.setApplicationNightMode to declare its theme to the system. This way, the system can use suitable colors duiring the splash screen. This should fix enableEdgeToEdge as well.

On API <31, it's easy if you can use AppCompatDelegate.setDefaultNightMode(int), but I can understand that you don't want to add appcompat dependency just for this.

So, custom mode is useful for apps that:

Provide in-app light/dark mode settings on API <31.
Don't want to depend on appcompat

I'm not sure if it's super common, but I guess the feature is worth implementing. I'll put it during the next alpha phase.

For Now in Android, I recommend you still call setApplicationNightMode on API 31+ regardless of enableEdgeToEdge. On API <31, just for the time being, you can either use the current e2e implementation, hide the setting, depend on appcompat, or just bear with the minor UI glitch. None of these are great, but I don't have a good solution now.

ap...@google.com <ap...@google.com> #7Jun 15, 2023 11:37PM

Project: platform/frameworks/support
Branch: androidx-main

commit 27e7d52e8604a080133e8b842db10c89b4482598
Author: Yuichi Araki <yaraki@google.com>
Date: Wed Apr 19 12:56:59 2023

Add SystemBarStyle.custom

Relnote: "Add an optional parameter `detectDarkMode` to SystemBarStyle.auto for detecting night mode by custom logic"
Test: androidx.activity.EdgeToEdgeTest.enableCustom
Bug: 278263793
Change-Id: I78322867ba3940939e137479383eca08efc9a2b6

M activity/activity/api/current.txt
M activity/activity/api/restricted_current.txt
M activity/activity/src/androidTest/java/androidx/activity/EdgeToEdgeTest.kt
M activity/activity/src/main/java/androidx/activity/EdgeToEdge.kt
M activity/integration-tests/testapp/src/main/java/androidx/activity/integration/testapp/EdgeToEdgeActivity.kt
M activity/integration-tests/testapp/src/main/res/layout/edge_to_edge_activity.xml

https://android-review.googlesource.com/2546393

va...@google.com <va...@google.com> Jun 15, 2023 11:42PM

Reassigned to ya...@google.com.

ya...@google.com <ya...@google.com> Jun 15, 2023 11:43PM

Marked as fixed.

pr...@google.com <pr...@google.com> #8Jun 21, 2023 08:58PM

The following release(s) address this bug.It is possible this bug has only been partially addressed:

androidx.activity:activity:1.8.0-alpha06