Fix distance units (firebase#269)

Author: samtstern

firestore/app/src/main/java/com/google/example/firestore/SolutionGeoqueries.java

@@ -84,8 +84,9 @@ public void onComplete(@NonNull Task<List<Task<?>>> t) {
                                 // We have to filter out a few false positives due to GeoHash
                                 // accuracy, but most will match
                                 GeoLocation docLocation = new GeoLocation(lat, lng);
-                                double distance = GeoFireUtils.getDistanceBetween(docLocation, center);
-                                if (distance <= radiusInKm) {
+                                double distanceInM = GeoFireUtils.getDistanceBetween(docLocation, center);
+                                double distanceInKm = distanceInM / 1000;
+                                if (distanceInKm <= radiusInKm) {
                                     matchingDocs.add(doc);
                                 }
                             }

firestore/app/src/main/java/com/google/example/firestore/kotlin/SolutionGeoqueries.kt

@@ -66,8 +66,9 @@ class SolutionGeoqueries {
                             // We have to filter out a few false positives due to GeoHash
                             // accuracy, but most will match
                             val docLocation = GeoLocation(lat, lng)
-                            val distance = GeoFireUtils.getDistanceBetween(docLocation, center)
-                            if (distance <= radiusInKm) {
+                            val distanceInM = GeoFireUtils.getDistanceBetween(docLocation, center)
+                            val distanceInKm = distanceInM / 1000
+                            if (distanceInKm <= radiusInKm) {
                                 matchingDocs.add(doc)
                             }
                         }