fix(android): Always remove FirstDrawDoneListener after the first draw

[runningcode]

📜 Description

FirstDrawDoneListener now removes itself by posting the removal to the main thread. Before, it waited for the next global layout.

💡 Motivation and Context

You can't remove an OnDrawListener from inside onDraw (API 26+ throws). So the listener registered an OnGlobalLayoutListener and removed itself from there. But a draw isn't always followed by a layout pass. On a static screen, the listener stayed registered and ran on every frame (as a no-op), and it kept its callback reachable. That callback captures ActivityLifecycleIntegration and the ttid/ttfd spans. ActivityLifecycleIntegration registers a new listener on every onActivityResumed, so these could pile up on the decor view until the next layout.

It isn't a memory leak: everything is only reachable from the decor view's ViewTreeObserver and dies with the activity. The fix makes the removal happen every time and drops the extra layout listener.

💚 How did you test it?

Updated FirstDrawDoneListenerTest: the listener is now removed after onDraw without any layout pass.

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

🔮 Next steps

Consider registering only once per activity in ActivityLifecycleIntegration.onActivityResumed, instead of on every resume.

🤖 Generated with Claude Code

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.57.0 (1)	release

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