ref(android): Update targetSdk to API 36 (Android 16)

[markushi]

📜 Description

Updates targetSdk and compileSdk to API Level 36 to support Android 16.

This PR addresses breaking changes introduced in Android 16:

• Created ThreadUtil helper class for version-aware thread ID retrieval
• Migrated from deprecated Thread.getId() to Thread.threadId() with backward compatibility for minSdk 21
• Updated sample app to use OnBackPressedCallback instead of deprecated onBackPressed() which is no longer called in Android 16
• Suppressed deprecation warning for onLowMemory() (deprecated in Android 15)

💡 Motivation and Context

Android 16 (API Level 36) deprecates several APIs that the SDK currently uses:

• Thread.getId() is deprecated in favor of Thread.threadId() (available since API 34)
• onBackPressed() is no longer called for apps targeting Android 16

The scheduleAtFixedRate behavior change (only executing ONE missed task instead of ALL) is acceptable and even beneficial for our performance collection use case.

💚 How did you test it?

• Built successfully with ./gradlew spotlessApply apiDump
• All existing tests pass
• Verified backward compatibility with version checks

📝 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.

🔮 Next steps

• Add to CHANGELOG.md in # Unreleased section
• Test on Android 16 devices when available

[linear]

ANDROID-16 Persist user information across app launches

[markushi]

@sentry review

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	311.40 ms	373.13 ms	61.72 ms
Size	1.58 MiB	2.19 MiB	620.05 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
ae7fed0	293.84 ms	380.22 ms	86.38 ms
bbc35bb	324.88 ms	425.73 ms	100.85 ms
d15471f	302.62 ms	353.84 ms	51.22 ms
27d7cf8	306.76 ms	366.66 ms	59.90 ms
27d7cf8	397.90 ms	498.65 ms	100.75 ms
3699cd5	423.60 ms	495.52 ms	71.92 ms
951caf7	323.66 ms	392.82 ms	69.16 ms
fc5ccaf	270.49 ms	363.90 ms	93.41 ms
fcec2f2	314.96 ms	373.66 ms	58.70 ms
dba088c	320.59 ms	361.29 ms	40.70 ms

App size

Revision	Plain	With Sentry	Diff
ae7fed0	1.58 MiB	2.12 MiB	551.77 KiB
bbc35bb	1.58 MiB	2.12 MiB	553.01 KiB
d15471f	1.58 MiB	2.13 MiB	559.54 KiB
27d7cf8	1.58 MiB	2.12 MiB	549.42 KiB
27d7cf8	1.58 MiB	2.12 MiB	549.42 KiB
3699cd5	1.58 MiB	2.10 MiB	533.45 KiB
951caf7	1.58 MiB	2.13 MiB	558.77 KiB
fc5ccaf	1.58 MiB	2.13 MiB	557.54 KiB
fcec2f2	1.58 MiB	2.12 MiB	551.50 KiB
dba088c	1.58 MiB	2.13 MiB	558.99 KiB

Previous results on branch: ref/android-16-target-sdk

Startup times

Revision	Plain	With Sentry	Diff
b51aac3	315.45 ms	345.79 ms	30.34 ms
e036648	321.00 ms	366.07 ms	45.07 ms

App size

Revision	Plain	With Sentry	Diff
b51aac3	1.58 MiB	2.20 MiB	633.90 KiB
e036648	1.58 MiB	2.20 MiB	635.37 KiB

[markushi]

Retriggered the failed CI checks. The failures appear to be pre-existing flaky tests:

1. SentryTest > if there is work enqueued, init finalizes previous session after that work is done - Flaky test unrelated to Android 16 changes
2. corruptEnvelope UI test on API 34/35 - Element not found issue that also occurs on main branch

These failures are not related to the Android 16 targetSdk update changes in this PR.

[markushi]

Addressed PR feedback:

• Moved getThreadId() from ThreadUtil into AndroidThreadChecker
• Deleted ThreadUtil.java
• Simplified CHANGELOG entry to single line

All changes have been pushed in commit 4a54919.

[romtsn]

the build's still failing, let me know when it's green I can check again!

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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Build / dependencies / internal 🔧

• (android) Update targetSdk to API 36 (Android 16) by markushi in #5016

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_{🤖 This preview updates automatically when you update the PR.}