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android_frameworks_base/packages/FusedLocation/NOTICE
Nick Pelly 6fa9ad4afc Location overhaul, major commit. 
Themes: Fused Location, Geofencing, LocationRequest.

API changes
o Fused location is always returned when asking for location by Criteria.
o Fused location is never returned as a LocationProvider object, nor returned
  as a provider String. This wouldn't make sense because the current API
  design assumes that LocationProvider's have fixed properties (accuracy, power
  etc).
o The fused location engine will tune itself based on the criteria passed
  by applications.
o Deprecate LocationProvider. Apps should use fused location (via Criteria
  class), instead of enumerating through LocationProvider objects. It is
  also over-engineered: designed for a world with a plethora of location
  providers that never materialized.
o The Criteria class is also over-engineered, with many methods that aren't
  currently used, but for now we won't deprecate them since they may have
  value in the future. It is now used to tune the fused location engine.
o Deprecate getBestProvider() and getProvider().
o Add getLastKnownLocation(Criteria), so we can return last known
  fused locations.
o Apps with only ACCESS_COARSE_LOCATION _can_ now use the GPS, but the location
  they receive will be fudged to a 1km radius. They can also use NETWORK
  and fused locatoins, which are fudged in the same way if necessary.
o Totally deprecate Criteria, in favor of LocationRequest.
  Criteria was designed to map QOS to a location provider. What we
  really need is to map QOS to _locations_.
  The death knell was the conflicting ACCURACY_ constants on
  Criteria, with values 1, 2, 3, 1, 2. Yes not a typo.
o Totally deprecate LocationProvider.
o Deprecate test/mock provider support. They require a named provider,
  which is a concept we are moving away from. We do not yet have a
  replacement, but I think its ok to deprecate since you also
  need to have 'allow mock locations' checked in developer settings.
  They will continue to work.
o Deprecate event codes associated with provider status. The fused
  provider is _always_ available.
o Introduce Geofence data object to provide an easier path fowards
  for polygons etc.

Implementation changes
o Fused implementation: incoming (GPS and NLP) location fixes are given
  a weight, that exponentially decays with respect to age and accuracy.
  The half-life of age is ~60 seconds, and the half-life of accuracy is
  ~20 meters. The fixes are weighted and combined to output a fused
  location.
o Move Fused Location impl into
  frameworks/base/packages/FusedLocation
o Refactor Fused Location behind the IProvider AIDL interface. This allow us
  to distribute newer versions of Fused Location in a new APK, at run-time.
o Introduce ServiceWatcher.java, to refactor code used for run-time upgrades of
  Fused Location, and the NLP.
o Fused Location is by default run in the system server (but can be moved to
  any process or pacakge, even at run-time).
o Plumb the Criteria requirements through to the Fused Location provider via
  ILocation.sendExtraCommand(). I re-used this interface to avoid modifying the
  ILocation interface, which would have broken run-time upgradability of the
  NLP.
o Switch the geofence manager to using fused location.
o Clean up 'adb shell dumpsys location' output.
o Introduce config_locationProviderPackageNames and
  config_overlay_locationProviderPackageNames to configure the default
  and overlay package names for Geocoder, NLP and FLP.
o Lots of misc cleanup.
o Improve location fudging. Apply random vector then quantize.
o Hide internal POJO's from clients of com.android.location.provider.jar
  (NLP and FLP). Introduce wrappers ProviderRequestUnbundled and
  ProviderPropertiesUnbundled.
o Introduce ProviderProperties to collapse all the provider accuracy/
  bearing/altitude/power plumbing (that is deprecated anyway).
o DELETE lots of code: DummyLocationProvider,
o Rename the (internal) LocationProvider to LocationProviderBase.
o Plumb pid, uid and packageName throughout
  LocationManagerService#Receiver to support future features.

TODO: The FLP and Geofencer have a lot of room to be more intelligent
TODO: Documentation
TODO: test test test

Change-Id: Iacefd2f176ed40ce1e23b090a164792aa8819c55
2012-08-10 14:57:09 -07:00

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