Fix EventChannel calls from background thread on Android#22
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Fixes #23
This fixes a crash on Android when managed app configurations are changed while listening to
mangedConfigurationsStream.Cause:
eventSink.success()/eventSink.error()were triggered from the executor background thread ingetApplicationRestrictionsAsync(...).Effect:
Flutter crashes with
FlutterJNI.ensureRunningOnMainThreadwhen TestDPC or another EMM updates managed configurations.Fix:
Post EventChannel callbacks back to the main thread using
Handler(Looper.getMainLooper()).I verified this on a real Android device provisioned with TestDPC as Device Owner by changing managed configurations multiple times.