[notification] Android: every notification gets an empty InboxStyle, hiding the body

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
82/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
android, kotlin, rust
Domain
backend, mobile-dev

Research direction

Start by tracing how NotificationData.inbox_lines is serialized from Rust and how TauriNotificationManager.buildNotification applies InboxStyle in Kotlin. Compare the two suggested fixes and check the existing notification tests or add a regression case for a title-and-body notification. Done means the expanded Android notification shows its body without requiring large_body.

Written by the indexing model from the issue text.

Description

Describe the bug

On Android, a notification built with only a title and body shows no body text when expanded:

app.notification().builder().title("Claude Bot").body("Hello").show()?;

adb shell dumpsys notification --noredact shows the notification was posted with an empty InboxStyle:

android.title=String (Claude Bot)
android.textLines=CharSequence[] (0)

On Samsung One UI the notification is shown expanded by default, so the message text is never visible.

Cause

NotificationData.inbox_lines is a Vec<String> with #[serde(default)] and no skip_serializing_if, so every notification is sent to Kotlin with "inboxLines": []. Notification.inboxLines is List<String>?, and TauriNotificationManager.buildNotification applies InboxStyle whenever inboxLines != null. An empty list is not null, so every notification without largeBody gets an InboxStyle with zero lines, which replaces the body in the expanded view.

Reproduction
  1. On Android, show a notification with only title and body set.
  2. Expand it (or view it on One UI): only the title is visible.
  3. adb shell dumpsys notification --noredact lists android.textLines=CharSequence[] (0).
Expected behavior

The body text is visible in the expanded notification.

Suggested fix

Either #[serde(skip_serializing_if = "Vec::is_empty")] on inbox_lines, or !notification.inboxLines.isNullOrEmpty() in buildNotification.

Workaround: also set large_body to the body text. BigTextStyle is checked before InboxStyle.

Platform and versions
  • tauri-plugin-notification 2.3.3; the same code is on the current default branch (2.8.0)
  • Android, Samsung One UI
Dominant language
Rust
Stars
1.8k
Forks
637
Avg merge
5d 3h
Merged PRs (30d)
36

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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