fix: respect autoplay setting in playback service

[GadhiyaRaj]

Problem

When the "Autoplay" setting is disabled in Settings (Player & Audio), playback continues to automatically advance to the next song in the queue once the current song ends, rather than pausing.

Cause

1. In ExoPlayer / Media3, the default behavior for a playlist is to seamlessly transition to the next MediaItem upon completion. Because player.pauseAtEndOfMediaItems was never configured from the AutoplayKey preference, ExoPlayer always auto-advanced regardless of the setting.
2. When crossfade is enabled, scheduleCrossfade() scheduled a secondary player transition several seconds before track completion without checking the autoplay preference, bypassing track-end handling entirely.

Solution

• Updated the AutoplayKey preference observer in MusicService to set player.pauseAtEndOfMediaItems = !cachedAutoplay, pausing playback at the end of each track when autoplay is turned off.
• Guarded scheduleCrossfade() with if (!cachedAutoplay) return to prevent early transitions into upcoming queue items when autoplay is disabled.

Testing

• Disabled "Autoplay" in Player Settings, queued multiple songs, and verified playback stops at the end of the current song instead of playing the next.
• Re-enabled "Autoplay" and verified the player seamlessly continues to the next song as expected.
• Tested with all 3 repeat types (none, once, all).
• Verified with crossfade enabled to confirm that early transitions do not trigger when autoplay is off.

Related Issues

• Closes Turning Off Autoplay Does Not Prevent Autoplaying #4195

Summary by CodeRabbit

• Bug Fixes
  • Playback now pauses at the end of the queue when Autoplay is disabled.
  • Crossfade no longer starts when Autoplay is turned off.
  • Autoplay settings are now consistently applied when playback starts or the player is recreated.
  • Crossfade evaluation updates correctly when Autoplay is enabled or disabled.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 332a79c7-6a44-4e85-9f01-fb64c847e7a0

📥 Commits

Reviewing files that changed from the base of the PR and between 4bbbd9d and 562e633.

📒 Files selected for processing (1)

• app/src/main/kotlin/com/metrolist/music/playback/MusicService.kt

🚧 Files skipped from review as they are similar to previous changes (1)

• app/src/main/kotlin/com/metrolist/music/playback/MusicService.kt

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📝 Walkthrough

Walkthrough

The Autoplay preference now applies to initial and recreated players. Preference changes update the current player and crossfade work. Crossfade scheduling and callbacks stop when Autoplay is disabled.

Changes

Autoplay playback control

Layer / File(s)	Summary
Autoplay preference handling app/src/main/kotlin/com/metrolist/music/playback/MusicService.kt	Players initialize pauseAtEndOfMediaItems from Autoplay settings. Autoplay changes update the current player, cancel pending crossfade work when disabled, and reschedule evaluation when enabled. Crossfade scheduling and callbacks recheck Autoplay before execution.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 562e6

The Autoplay change has no remaining actionable merge risk in the reviewed playback paths.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: making the playback service respect the Autoplay setting.
Description check	✅ Passed	The description includes all required sections. It clearly explains the problem, cause, solution, testing, and related issue.
Linked Issues check	✅ Passed	Issue #4195 requires playback to stop after the current song when Autoplay is off. The PR applies the Autoplay state to initial and recreated players. Disabling Autoplay cancels pending crossfade mess…
Out of Scope Changes check	✅ Passed	The reported changes are limited to Autoplay queue advancement and related crossfade handling in MusicService. Player initialization, preference changes, and crossfade checks directly support issue …

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Actionable comments posted: 2

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Inline comments:
In `@app/src/main/kotlin/com/metrolist/music/playback/MusicService.kt`:
- Line 1159: Ensure pauseAtEndOfMediaItems is applied to every newly created
player, not only the current player collector. Update createExoPlayer() to
initialize it from cachedAutoplay, or assign the same value to newPlayer before
prepare() in the AudioTrackPlaybackParamsKey recreation path, while preserving
the existing AutoplayKey behavior.
- Line 4759: Update the Autoplay preference-change handling and the crossfade
callback around scheduleCrossfade so pending crossfadeMessage work cannot start
after cachedAutoplay is disabled. Either cancel or reschedule the pending
message when the preference changes, or recheck cachedAutoplay immediately
before startCrossfade, preserving existing behavior while Autoplay remains
enabled.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 60990b5d-6d19-4bc1-b16c-b6205a206a0c

📥 Commits

Reviewing files that changed from the base of the PR and between 7c5ba3a and 4bbbd9d.

📒 Files selected for processing (1)

• app/src/main/kotlin/com/metrolist/music/playback/MusicService.kt

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.