navigation intent gets opened correctly

frontend/lib/modules/map_chooser.dart

@@ -0,0 +1,52 @@
+import 'package:anyway/structs/landmark.dart';
+import 'package:flutter/material.dart';
+import 'package:map_launcher/map_launcher.dart';
+import 'package:flutter_svg/flutter_svg.dart';
+
+showMapChooser(BuildContext context, Landmark current, Landmark next) async {
+  List availableMaps = [];
+  try {
+    availableMaps = await MapLauncher.installedMaps;
+  } catch (e) {
+    print(e);
+  }
+  if (availableMaps.isEmpty) {
+    return;
+  }
+
+  showModalBottomSheet(
+    context: context,
+    builder: (BuildContext context) {
+      return SafeArea(
+        child: SingleChildScrollView(
+          child: Container(
+            child: Wrap(
+              children: <Widget>[
+                for (var map in availableMaps)
+                  ListTile(
+                    onTap: () => map.showDirections(
+                      origin: Coords(current.location[0], current.location[1]),
+                      originTitle: current.name,
+                      destination: Coords(next.location[0], next.location[1]),
+                      destinationTitle: current.name,
+                      directionsMode: DirectionsMode.walking
+                    ),
+                    title: Text(map.mapName),
+                    // rounded corners
+                    leading: ClipRRect(
+                      borderRadius: BorderRadius.circular(8.0),
+                      child: SvgPicture.asset(
+                        map.icon,
+                        height: 30.0,
+                        width: 30.0,
+                      ),
+                    )
+                  ),
+              ],
+            ),
+          ),
+        ),
+      );
+    },
+  );
+}

frontend/lib/modules/step_between_landmarks.dart

@@ -1,5 +1,6 @@
 import 'package:anyway/structs/landmark.dart';
 import 'package:flutter/material.dart';
+import 'package:anyway/modules/map_chooser.dart';
 
 class StepBetweenLandmarks extends StatefulWidget {
   final Landmark current;
@@ -18,7 +19,7 @@ class StepBetweenLandmarks extends StatefulWidget {
 class _StepBetweenLandmarksState extends State<StepBetweenLandmarks> {
   @override
   Widget build(BuildContext context) {
-    int timeRounded = 5 * (widget.current.tripTime?.inMinutes ?? 0) ~/ 5;
+    int timeRounded = 5 * ((widget.current.tripTime?.inMinutes ?? 0) ~/ 5);
     // ~/ is integer division (rounding)
     return Container(
       margin: EdgeInsets.all(10),
@@ -27,11 +28,6 @@ class _StepBetweenLandmarksState extends State<StepBetweenLandmarks> {
         border: Border(
           left: BorderSide(width: 3.0, color: Colors.black),
         ),
-        // gradient: LinearGradient(
-        //   begin: Alignment.topLeft,
-        //   end: Alignment.bottomRight,
-        //   colors: [Colors.grey, Colors.white, Colors.white],
-        // ),
       ),
       child: Row( 
         children: [
@@ -43,8 +39,8 @@ class _StepBetweenLandmarksState extends State<StepBetweenLandmarks> {
           ),
           Spacer(),
           ElevatedButton(
-            onPressed: () {
-              // Open navigation instructions
+            onPressed: () async {
+              showMapChooser(context, widget.current, widget.next);
             },
             child: Row(
               children: [