Pintal/clean up dispatcher and is built

[polbins]

Describe what this PR is addressing

Describe the solution

Steps to verify the change

Useful links and documentation (optional)

Checklist

• Does your PR title have the correct title format?
• Does your PR have a breaking change?

---

Note

Medium Risk
Concurrency/initialization ordering changes (removing isBuilt.await() and moving work to storageIODispatcher) could surface race conditions in event/session processing or storage/migration timing, though the changes are localized and covered by updated tests.

Overview
Shifts SDK coroutine execution away from amplitudeDispatcher by deprecating it in core, removing it from the Android wrapper/test helpers, and running core build() and flush() on storageIODispatcher instead.

Removes several isBuilt.await() gates (Android Timeline.start, DefaultEventUtils storage writes, core flush) and simplifies Android reset() to always regenerate the device ID via AndroidContextPlugin. Also makes AndroidContextPlugin lazily initialize its AndroidContextProvider on first use and cleans up a few minor Kotlin style issues.

^{Written by Cursor Bugbot for commit c8f7209. This will update automatically on new commits. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix prepared a fix for the issue found in the latest run.

• ✅ Fixed: Reset crashes if called before async build completes
  • Added guard to check isBuilt.isCompleted before calling androidContextPlugin.initializeDeviceId(), with fallback to direct setDeviceId() call when build is incomplete.

Or push these changes by commenting:

@cursor push 8015690ab3

Preview (8015690ab3)

diff --git a/android/src/main/java/com/amplitude/android/Amplitude.kt b/android/src/main/java/com/amplitude/android/Amplitude.kt
--- a/android/src/main/java/com/amplitude/android/Amplitude.kt
+++ b/android/src/main/java/com/amplitude/android/Amplitude.kt
@@ -128,7 +128,11 @@
 
     override fun reset(): Amplitude {
         setUserId(null)
-        androidContextPlugin.initializeDeviceId(configuration as Configuration, forceRegenerate = true)
+        if (isBuilt.isCompleted) {
+            androidContextPlugin.initializeDeviceId(configuration as Configuration, forceRegenerate = true)
+        } else {
+            setDeviceId(ContextPlugin.generateRandomDeviceId())
+        }
         return this
     }

_{This Bugbot Autofix run was free. To enable autofix for future PRs, go to the Cursor dashboard.}

[cursor]

Reset crashes if called before async build completes

High Severity

The old reset() guarded against calling androidContextPlugin.initializeDeviceId() before the build completed by checking isBuilt.isCompleted and falling back to setDeviceId(ContextPlugin.generateRandomDeviceId()). That guard is now removed. Since androidContextPlugin has a lateinit var amplitude that is only set during setup() (called when the plugin is added to the timeline in buildInternal()), calling reset() before the async build completes will throw an UninitializedPropertyAccessException. Every code path through initializeDeviceId() calls setDeviceId(), which accesses amplitude.

Additional Locations (1)

• android/src/main/java/com/amplitude/android/plugins/AndroidContextPlugin.kt#L46-L91