Hook User Interaction integration into running Activity in case of deferred SDK init

[markushi]

📜 Description

Fixes #3746
Fixes #4356

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• 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.

🔮 Next steps

[markushi]

Actual access to these optional deps is guarded by an if-check, I guess that should be good enough. Will do a manual test as well, just to be sure.

[markushi]

Just did a test, works as expected 🚀

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	362.13 ms	429.16 ms	67.04 ms
Size	1.58 MiB	2.08 MiB	507.58 KiB

Previous results on branch: markushi/fix/ui-interactions-deferred-init

Startup times

Revision	Plain	With Sentry	Diff
6d25951	476.36 ms	536.73 ms	60.37 ms
c9e36ee	471.17 ms	523.91 ms	52.74 ms
cefe7fd	445.92 ms	520.37 ms	74.45 ms
7d05d6e	409.78 ms	472.38 ms	62.59 ms
7c4015f	402.46 ms	454.08 ms	51.62 ms

App size

Revision	Plain	With Sentry	Diff
6d25951	1.58 MiB	2.08 MiB	505.87 KiB
c9e36ee	1.58 MiB	2.08 MiB	507.58 KiB
cefe7fd	1.58 MiB	2.08 MiB	505.82 KiB
7d05d6e	1.58 MiB	2.08 MiB	507.83 KiB
7c4015f	1.58 MiB	2.08 MiB	507.85 KiB

[romtsn]

LGTM!

[stefanosiano]

looks good, but now we always set the first Activity via AppStartMetrics, but we never clear it if CurrentActivityIntegration is not started, like with react/flutter.
It shouldn't be a problem, since we use the current activity for non-hybrid stuff anyway.
Your call on what to do:

• call CurrentActivityHolder.getInstance().clearActivity() in the last Activity in AppStartMetrics
• add a comment for the future in CurrentActivityHolder.getActivity() to be aware of the possible activity non-existence in hybrid sdk
• completely replace the CurrentActivityIntegration with AppStartMetrics callback, so that it's always called in all environments

[romtsn]

oh, I just realized - we only set the currentActivity for the first activity here right? So it won't be the "last known activity" but rather the first one, which is incorrect, right? E.g. if you launched 3 activities, and then initialized the SDK it would use the wrong one to hook user interactions. Unless I got the above if-check wrong 😅

[stefanosiano]

yes, that's correct, it's a better rephrase of my comment 😅

[krystofwoldrich]

@markushi Is it feasible to port to sentry-java@v7, this would help React Native with missing activity issue. (Sadly RN is still on v7.)

[krystofwoldrich]

@stefanosiano but we never clear it if CurrentActivityIntegration is not started, like with react/flutter.

That's a good point, the CurrentActivityIntegration should be started for hybrids as well. Since we need it for slow and frozen frame, TTID, TTFD...

This RN PR fixes the CurrentActivityIntegration initialization in RN apps.

• fix(android): Init with ApplicationContext if available sentry-react-native#4780

[markushi]

@krystofwoldrich yes, we can backport it to v7!

[romtsn]

Made another pass - LGTM, great stuff!