Add approximate location radius circle

Radius circle shows device's location to within about 1 mile.

Issue #127

app/src/main/java/gov/wa/wsdot/android/wsdot/ui/trafficmap/TrafficMapFragment.kt

@@ -29,11 +29,13 @@ import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProvider
 import androidx.navigation.fragment.findNavController
 import com.google.android.gms.location.*
+import com.google.android.gms.location.LocationRequest.PRIORITY_HIGH_ACCURACY
 import com.google.android.gms.maps.CameraUpdateFactory
 import com.google.android.gms.maps.GoogleMap
 import com.google.android.gms.maps.OnMapReadyCallback
 import com.google.android.gms.maps.SupportMapFragment
 import com.google.android.gms.maps.model.*
+import com.google.android.gms.tasks.CancellationTokenSource
 import com.google.android.material.bottomappbar.BottomAppBar
 import com.google.android.material.bottomsheet.BottomSheetBehavior
 import com.google.android.material.bottomsheet.BottomSheetBehavior.*
@@ -118,6 +120,12 @@ class TrafficMapFragment : DaggerFragment(), Injectable, OnMapReadyCallback,
  // Camera update task timer
  var t: Timer? = null
 
+ // Approximate location radius circle
+ private var radiusCircle: Circle? = null
+
+ // Current location cancellation token
+ private var cancellationTokenSource = CancellationTokenSource()
+
  // FAB
  private lateinit var mFab: SpeedDialView
 
@@ -1020,6 +1028,7 @@ class TrafficMapFragment : DaggerFragment(), Injectable, OnMapReadyCallback,
  @SuppressLint("MissingPermission")
  @NeedsPermission(Manifest.permission.ACCESS_FINE_LOCATION)
  fun myLocationFine() {
+ radiusCircle?.remove()
  context?.let { context ->
  fusedLocationClient = LocationServices.getFusedLocationProviderClient(context)
  fusedLocationClient.lastLocation
@@ -1036,15 +1045,27 @@ class TrafficMapFragment : DaggerFragment(), Injectable, OnMapReadyCallback,
  fun myLocationCoarse() {
  context?.let { context ->
  fusedLocationClient = LocationServices.getFusedLocationProviderClient(context)
- fusedLocationClient.lastLocation
- .addOnSuccessListener { location : Location? ->
- mMap.isMyLocationEnabled = false
- requestLocationUpdates()
- requestGoToLocationUpdate()
+ fusedLocationClient.getCurrentLocation(PRIORITY_HIGH_ACCURACY, cancellationTokenSource.token).addOnSuccessListener { location : Location? ->
+ mMap.isMyLocationEnabled = false
+ if(location != null) {
+ circle(location)
  }
+ }
+ requestCoarseLocationUpdate()
  }
  }
 
+ private fun circle(location: Location) {
+ val circleOptions = CircleOptions()
+ .center(LatLng(location.latitude, location.longitude))
+ .radius(location.accuracy.toDouble())
+ .strokeWidth(5F)
+ .strokeColor(0x3571cce7)
+ .fillColor(0x3571cce7)
+ radiusCircle?.remove()
+ radiusCircle = mMap.addCircle(circleOptions)
+ }
+
  private fun checkAppPermissions() {
 
  // API 23 requires fine location alert dialog
@@ -1095,6 +1116,29 @@ class TrafficMapFragment : DaggerFragment(), Injectable, OnMapReadyCallback,
  onRequestPermissionsResult(requestCode, grantResults)
  }
 
+ @SuppressLint("MissingPermission")
+ private fun requestCoarseLocationUpdate() {
+
+ val locationRequest = LocationRequest()
+ locationRequest.numUpdates = 1
+
+ // Request location update every 60 seconds
+ locationRequest.interval = 60000
+
+ val locationCallback = object : LocationCallback() {
+ override fun onLocationResult(locationResult: LocationResult) {
+ locationResult ?: return
+ goToUsersLocation(locationResult.lastLocation)
+ }
+ }
+
+ fusedLocationClient.requestLocationUpdates(
+ locationRequest,
+ locationCallback,
+ Looper.getMainLooper())
+ }
+
+
  @SuppressLint("MissingPermission")
  private fun requestGoToLocationUpdate() {