[chmjdev]

Summary

While diagnosing location and measurement IPC issues with Uber / Uber Eats on Huawei EMUI 12 (Android 10 / API 29, -hw build), two recurring runtime issues appeared in logcat:

1. WorkSourceUtil.isEmpty(WorkSource) triggers greylist-max-o hidden-API reflection denial on API 29+:

   W gle.android.gm: Accessing hidden method Landroid/os/WorkSource;->isEmpty()Z (greylist-max-o, reflection, denied)
   

   WorkSource.isEmpty() is annotated with @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P) (greylist-max-o). When targetSdkVersion >= 29, reflecting WorkSource#isEmpty() is rejected by ART's hidden-API enforcement on every LocationRequest.toString() call, throwing NoSuchMethodException and falling through to size(workSource) == 0 (which uses unrestricted @UnsupportedAppUsage WorkSource#size()). Using size(workSource) == 0 directly (with a null guard) avoids the hidden-API violation and unnecessary exception allocation on every location request update.

2. IMeasurementService transaction code 27 (sendAppBackgrounded, AIDL = 26) and consent methods (= 24, = 25):

   W MeasurementService: Unknown method 27 in com.google.android.gms.measurement.internal.IMeasurementService, skipping
   

   Uncomments sendStorageConsentSettings (= 24), sendDmaConsentSettings (= 25), and sendAppBackgrounded (= 26, FIRST_CALL_TRANSACTION + 26 = 27) in IMeasurementService.aidl and implements their debug stubs in MeasurementServiceImpl.