update

lib/services/maxtrix_service.dart

@@ -0,0 +1,44 @@
+
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+
+
+class MatrixService{
+
+  static Future<Map<String, dynamic>>  getDestinations(List<dynamic> destinations) async {
+
+    String locs = "";
+    String origin = "";
+    int i = 0;
+    for(Map<String, dynamic> loc in destinations){
+
+      if(i==0){
+        origin = "${loc["location"]["geometry"]["coordinates"][0][1]}, ${loc["location"]["geometry"]["coordinates"][0][0]}";
+      }
+
+      print("lat is ${loc["location"]["geometry"]["coordinates"][0][1]}, long is ${loc["location"]["geometry"]["coordinates"][0][0]}");
+      locs += "${loc["location"]["geometry"]["coordinates"][0][1]}, ${loc["location"]["geometry"]["coordinates"][0][0]}|";
+      i++;
+    }
+
+    //print(locs);
+
+    Map<String, dynamic> cats = {};
+    String url = "https://maps.googleapis.com/maps/api/distancematrix/json?destinations=${locs}&origins=${origin}&key=AIzaSyBLgnwft3py6c4YkT-MxZ9y4zYGFgAEmRk";
+    print(url);
+    final http.Response response = await http.get(
+      Uri.parse(url),
+      headers: <String, String>{
+        'Content-Type': 'application/json; charset=UTF-8',
+      }
+    );
+
+    if (response.statusCode == 200) {
+      cats = json.decode(utf8.decode(response.bodyBytes));
+    }
+    return cats;
+  }
+
+
+}
+