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[XR] add in XR device lifecycle snippets#846

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trambui09 merged 1 commit intoandroid:mainfrom
trambui09:tb/xr-device-lifecycle
Mar 20, 2026
Merged

[XR] add in XR device lifecycle snippets#846
trambui09 merged 1 commit intoandroid:mainfrom
trambui09:tb/xr-device-lifecycle

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@trambui09
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Add in XR device lifecycle to track transitions between active and inactive device states using the standard Android Lifecycle.State values. This makes it seamless to determine exactly when to start projecting and when to expect user input.

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Summary of Changes

Hello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces foundational code for managing the lifecycle of XR devices within an Android application. By integrating with the Android Lifecycle, it provides a standardized and clear mechanism to monitor device state changes, which is crucial for optimizing performance and user experience in XR applications.

Highlights

  • XR Device Lifecycle Tracking: Added code snippets to track the lifecycle of an XR device, allowing for transitions between active (worn) and inactive (not worn) states.
  • Android Lifecycle Integration: The XR device lifecycle now leverages standard Android Lifecycle.State values, making it easier to integrate with existing Android application logic.
  • Seamless State Determination: This integration enables developers to seamlessly determine when to start projecting content and when to expect user input based on the device's current state.

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Code Review

This pull request adds a code snippet for the XR device lifecycle. My review identifies an opportunity to make the example more robust. The current implementation for checking the device's active state is incomplete. I've provided a suggestion to correctly handle all relevant lifecycle states, which will improve the clarity and correctness of the code snippet for developers who use it.

Comment on lines +39 to +43
when (state) {
Lifecycle.State.STARTED -> { /* Device is ACTIVE (worn) */ }
Lifecycle.State.CREATED -> { /* Device is INACTIVE (not worn) */ }
else -> { /* Handle other states */ }
}
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medium

The current logic for determining if the device is active only checks for Lifecycle.State.STARTED. However, a component in the STARTED state will typically transition to RESUMED. The RESUMED state would also be considered 'active', but it falls into the else block in the current implementation. To make this example more robust and accurate, it's better to check if the state is at least STARTED.

Suggested change
when (state) {
Lifecycle.State.STARTED -> { /* Device is ACTIVE (worn) */ }
Lifecycle.State.CREATED -> { /* Device is INACTIVE (not worn) */ }
else -> { /* Handle other states */ }
}
when {
state.isAtLeast(Lifecycle.State.STARTED) -> { /* Device is ACTIVE (worn) */ }
state == Lifecycle.State.CREATED -> { /* Device is INACTIVE (not worn) */ }
else -> { /* Handle other states */ }
}

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RESUMED isn't in the list of supported states for XR device.

@trambui09 trambui09 marked this pull request as ready for review March 20, 2026 21:00
@trambui09 trambui09 requested a review from a team as a code owner March 20, 2026 21:00
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@trambui09 trambui09 merged commit bdaf541 into android:main Mar 20, 2026
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@trambui09 trambui09 deleted the tb/xr-device-lifecycle branch March 20, 2026 21:45
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2 participants