audio-focus-multiplayer: Workflow Automation for AI Agents | OpenAgentSkill

Overview

Hold Android audio focus once at app level when several player instances are alive at the same time — dual-player crossfade, precached players — and keep focus-driven ducking off whatever gain line a fade already owns. Use when background playback dies between tracks, autoplay stalls after the first item, a duck never takes effect or never lifts, or volume jumps back to full in the middle of a transition.

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Audio focus with more than one live player

Android's per-player focus handling assumes one player for the life of the app. A crossfade breaks that assumption: instances are created, promoted and released constantly.

Releasing the outgoing instance abandons focus for the whole app.
The incoming instance was built with focus handling off, so it never re-requests it.
Result: the app is playing with no focus. The system pauses it at the next opportunity — or another app takes over and it never comes back.

The fix is one focus request owned by the component that owns the swap:

ExoPlayer.Builder(context)
    .setAudioAttributes(audioAttributes, /* handleAudioFocus = */ false)  // every instance
    .build()

private val audioFocusRequest by lazy {
    AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
        .setAudioAttributes(/* USAGE_MEDIA, CONTENT_TYPE_MUSIC */)
        .setOnAudioFocusChangeListener(audioFocusListener)
        .setWillPauseWhenDucked(false)     // we duck ourselves
        .build()
}

private fun requestAudioFocusInternal(): Boolean {
    if (hasAudioFocus) return true         // idempotent
    hasAudioFocus = audioManager.requestAudioFocus(audioFocusRequest) ==
        AudioManager.AUDIOFOCUS_REQUEST_GRANTED
    return hasAudioFocus
}

Focus now survives every swap, because no player instance ever held it.

Traps

Leaving handleAudioFocus = true on "just the main" instance. There is no main instance — the one holding focus is released at the end of every transition. Set it false on every instance you build, including precached ones, and let the adapter hold the single request.

Requesting focus only from the play button. Playback also starts from paths the user never taps: the transition that starts the incoming instance, and the load-and-play path used when a queue advances. Each of those must call the idempotent request. Because it is a no-op while focus is held, calling it in three places costs nothing and closes the gap where the app resumes with no focus after a transient loss.

Abandoning focus on every player release. Abandon only where playback genuinely ends — stop(), release(), and the branch that hands playback to another output. A release that is part of a swap must not touch focus. Keep the request object itself as a single lazy field: abandoning with a different request object than the one granted does nothing and fails silently.

Ducking on the same gain line as the fade ramp. A crossfade rewrites the player volume ~50 times per transition. A duck written to that same line is erased by the next ramp step, and when the duck lifts it writes full volume over a fade in progress — heard as the music jumping back to full mid-transition. Guard both directions on the fading flag:

AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK ->
    if (!isCrossfading) currentPlayer?.volume = internalVolume * duckVolumeFactor

AudioManager.AUDIOFOCUS_GAIN ->
    if (!isCrossfading) currentPlayer?.volume = internalVolume   // don't fight the ramp

This is a workaround, not the cure. The structural fix is the one a sleep-timer fade already needs: give the duck its own gain line and multiply the lines together at the audio path, so neither writer can erase the other. Reach for that as soon as a second automatic gain appears — two writers on one line is the pattern, and each new one doubles the interactions.

Restoring the duck to a hardcoded 1.0f. Restore to the user's level (internalVolume), never to full. Restoring to full silently discards the volume setting after every navigation prompt.

Treating all three losses the same. They mean different things and want different responses:

Focus change	Response
`LOSS`	permanent — pause, clear the resume flag, mark focus not held
`LOSS_TRANSIENT`	pause, and record whether you were actually playing so regain resumes only then
`LOSS_TRANSIENT_CAN_DUCK`	attenuate, do not pause
`GAIN`	restore the level, resume only if the flag was set

Resuming unconditionally on GAIN starts music the user had paused before the interruption.

Ducking while a programmatic fade is running. A duck and a sleep-timer fade are two independent attenuations. Once each has its own line the answer is simply that they multiply; sharing a line makes it a question with no good answer.

Assuming focus and the media session agree. A swap moves the session's listener to the incoming instance. Focus is unrelated and app-scoped. Do not derive one from the other, and do not let the session's own focus handling be enabled alongside yours — two owners fight.

Verifying it

Log the grant result on every request and every abandon. Between the first item and the last, hasAudioFocus must never go false; a false in the middle of a queue is the bug.
Play with the screen off through at least three transitions. Playback dying between items is the classic signature of focus lost on a swap.
Trigger a duck (a navigation prompt, or any app requesting transient-can-duck) both during steady playback and in the middle of a fade, and confirm the level returns to the user's level afterwards in both cases.
Take a phone call mid-playback and mid-fade. Correct: pause, then resume at the right level. Incorrect: resumes at full volume, or resumes when you had it paused.
grep -n "requestAudioFocus\|abandonAudioFocus" should show one request object, requests from every path that starts audio, and abandons only from terminal paths.

View source ↗

File metadata

name: audio-focus-multiplayer
description: Hold Android audio focus once at app level when several player instances are alive at the same time — dual-player crossfade, precached players — and keep focus-driven ducking off whatever gain line a fade already owns. Use when background playback dies between tracks, autoplay stalls after the first item, a duck never takes effect or never lifts, or volume jumps back to full in the middle of a transition.

View original text

---
name: audio-focus-multiplayer
description: Hold Android audio focus once at app level when several player instances are alive at the same time — dual-player crossfade, precached players — and keep focus-driven ducking off whatever gain line a fade already owns. Use when background playback dies between tracks, autoplay stalls after the first item, a duck never takes effect or never lifts, or volume jumps back to full in the middle of a transition.
---

# Audio focus with more than one live player

Android's per-player focus handling assumes one player for the life of the app. A
crossfade breaks that assumption: instances are created, promoted and released constantly.

- Releasing the outgoing instance **abandons focus for the whole app**.
- The incoming instance was built with focus handling **off**, so it never re-requests it.
- Result: the app is playing with no focus. The system pauses it at the next opportunity —
  or another app takes over and it never comes back.

The fix is one focus request owned by the component that owns the swap:

```kotlin
ExoPlayer.Builder(context)
    .setAudioAttributes(audioAttributes, /* handleAudioFocus = */ false)  // every instance
    .build()
```

```kotlin
private val audioFocusRequest by lazy {
    AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
        .setAudioAttributes(/* USAGE_MEDIA, CONTENT_TYPE_MUSIC */)
        .setOnAudioFocusChangeListener(audioFocusListener)
        .setWillPauseWhenDucked(false)     // we duck ourselves
        .build()
}

private fun requestAudioFocusInternal(): Boolean {
    if (hasAudioFocus) return true         // idempotent
    hasAudioFocus = audioManager.requestAudioFocus(audioFocusRequest) ==
        AudioManager.AUDIOFOCUS_REQUEST_GRANTED
    return hasAudioFocus
}
```

Focus now survives every swap, because no player instance ever held it.

## Traps

**Leaving `handleAudioFocus = true` on "just the main" instance.** There is no main instance
— the one holding focus is released at the end of every transition. Set it `false` on every
instance you build, including precached ones, and let the adapter hold the single request.

**Requesting focus only from the play button.** Playback also starts from paths the user
never taps: the transition that starts the incoming instance, and the load-and-play path
used when a queue advances. Each of those must call the idempotent request. Because it is a
no-op while focus is held, calling it in three places costs nothing and closes the gap where
the app resumes with no focus after a transient loss.

**Abandoning focus on every player release.** Abandon only where playback genuinely ends —
`stop()`, `release()`, and the branch that hands playback to another output. A release that is
part of a swap must not touch focus. Keep the request object itself as a single `lazy`
field: abandoning with a *different* request object than the one granted does nothing and
fails silently.

**Ducking on the same gain line as the fade ramp.** A crossfade rewrites the player volume
~50 times per transition. A duck written to that same line is erased by the next ramp step,
and when the duck lifts it writes full volume over a fade in progress — heard as the music
jumping back to full mid-transition. Guard both directions on the fading flag:

```kotlin
AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK ->
    if (!isCrossfading) currentPlayer?.volume = internalVolume * duckVolumeFactor

AudioManager.AUDIOFOCUS_GAIN ->
    if (!isCrossfading) currentPlayer?.volume = internalVolume   // don't fight the ramp
```

This is a workaround, not the cure. The structural fix is the one a sleep-timer fade already
needs: give the duck **its own gain line** and multiply the lines together at the audio path,
so neither writer can erase the other. Reach for that as soon as a second automatic gain
appears — two writers on one line is the pattern, and each new one doubles the interactions.

**Restoring the duck to a hardcoded 1.0f.** Restore to the *user's* level
(`internalVolume`), never to full. Restoring to full silently discards the volume setting
after every navigation prompt.

**Treating all three losses the same.** They mean different things and want different
responses:

| Focus change | Response |
|---|---|
| `LOSS` | permanent — pause, clear the resume flag, mark focus not held |
| `LOSS_TRANSIENT` | pause, **and record whether you were actually playing** so regain resumes only then |
| `LOSS_TRANSIENT_CAN_DUCK` | attenuate, do not pause |
| `GAIN` | restore the level, resume only if the flag was set |

Resuming unconditionally on `GAIN` starts music the user had paused before the interruption.

**Ducking while a programmatic fade is running.** A duck and a sleep-timer fade are two
independent attenuations. Once each has its own line the answer is simply that they
multiply; sharing a line makes it a question with no good answer.

**Assuming focus and the media session agree.** A swap moves the session's listener to the
incoming instance. Focus is unrelated and app-scoped. Do not derive one from the other, and
do not let the session's own focus handling be enabled alongside yours — two owners fight.

## Verifying it

- Log the grant result on every request and every abandon. Between the first item and the
  last, `hasAudioFocus` must never go false; a false in the middle of a queue is the bug.
- Play with the screen off through at least three transitions. Playback dying between items
  is the classic signature of focus lost on a swap.
- Trigger a duck (a navigation prompt, or any app requesting transient-can-duck) both during
  steady playback and in the middle of a fade, and confirm the level returns to the *user's*
  level afterwards in both cases.
- Take a phone call mid-playback and mid-fade. Correct: pause, then resume at the right
  level. Incorrect: resumes at full volume, or resumes when you had it paused.
- `grep -n "requestAudioFocus\|abandonAudioFocus"` should show one request object, requests
  from every path that starts audio, and abandons only from terminal paths.

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: GPL-3.0

Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
AI review approval is missing
This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
Quality score needs review
Stars/forks activity: 202 stars, 6 forks; issue activity unavailable in current metadata
Review status: AI review approval is missing

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Source & usage notes

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Source repository: maxrave-dev/kotlin-footguns
License: GPL-3.0
Version: Unknown
Last GitHub push: Aug 29, 2026
Registry updated: Sep 10, 2026
Instruction path: skills/audio-focus-multiplayer/SKILL.md @ 01d9e37ed966

Version reported in registry metadata; check source releases before relying on it.

Quality

65/100

Promising

Trust

69/100

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More details

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    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20audio-focus-multiplayer%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20audio-focus-multiplayer%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/maxrave-dev-audio-focus-multiplayer/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/maxrave-dev-audio-focus-multiplayer"
  }
}

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Creator: maxrave-dev
Source: maxrave-dev/kotlin-footguns
Indexed by: OpenAgentSkill community index

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