android/src/com/mapswithme/maps/location/GoogleFusedLocationProvider.java


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package com.mapswithme.maps.location;

import android.location.Location;
import android.os.Bundle;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.mapswithme.maps.MwmApplication;

public class GoogleFusedLocationProvider extends BaseLocationProvider
    implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener
{
  private static final String GS_LOCATION_PROVIDER = "fused";

  private LocationRequest mLocationRequest;
  private GoogleApiClient mGoogleApiClient;

  private boolean mIsResolvingError;

  public GoogleFusedLocationProvider()
  {
    mGoogleApiClient = new GoogleApiClient.Builder(MwmApplication.get())
        .addApi(LocationServices.API)
        .addConnectionCallbacks(this)
        .addOnConnectionFailedListener(this)
        .build();

    mLocationRequest = LocationRequest.create();
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    mLocationRequest.setInterval(LOCATION_UPDATE_INTERVAL);
    mLocationRequest.setFastestInterval(LOCATION_UPDATE_INTERVAL / 2);
  }

  @Override
  protected void startUpdates()
  {
    if (mGoogleApiClient != null && !mGoogleApiClient.isConnected() && !mGoogleApiClient.isConnecting())
      mGoogleApiClient.connect();
  }

  @Override
  protected void stopUpdates()
  {
    if (mGoogleApiClient != null)
    {
      if (mGoogleApiClient.isConnected())
        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
      mGoogleApiClient.disconnect();
    }
  }

  @Override
  protected boolean isLocationBetterThanLast(Location newLocation)
  {
    if (newLocation == null)
      return false;

    Location lastLocation = LocationHelper.INSTANCE.getLastLocation();
    if (lastLocation == null)
      return true;

    // We believe that google service always returns good locations.
    return GS_LOCATION_PROVIDER.equalsIgnoreCase(newLocation.getProvider()) ||
        !GS_LOCATION_PROVIDER.equalsIgnoreCase(lastLocation.getProvider()) && super.isLocationBetterThanLast(newLocation);

  }

  @Override
  public void onConnected(Bundle bundle)
  {
    mLogger.d("Fused onConnected. Bundle " + bundle);
    LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    LocationHelper.INSTANCE.registerSensorListeners();
    final Location l = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    if (l != null)
      LocationHelper.INSTANCE.setLastLocation(l);
  }

  @Override
  public void onConnectionSuspended(int i)
  {
    mLogger.d("Fused onConnectionSuspended. Code " + i);
  }

  @Override
  public void onConnectionFailed(ConnectionResult connectionResult)
  {
    mLogger.d("Fused onConnectionFailed. Fall back to native provider. ConnResult " + connectionResult);
    // TODO handle error in a smarter way
    LocationHelper.INSTANCE.initLocationProvider(true);
  }

  @Override
  public void onLocationChanged(Location location)
  {
    // Completely ignore locations without lat and lon
    if (location.getAccuracy() <= 0.0)
      return;

    if (isLocationBetterThanLast(location))
    {
      LocationHelper.INSTANCE.initMagneticField(location);
      LocationHelper.INSTANCE.setLastLocation(location);
    }
  }
}