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: () {
+            onPressed: () async {
-              // Open navigation instructions
+              showMapChooser(context, widget.current, widget.next);
             },
             child: Row(
               children: [

frontend/pubspec.lock

@@ -1,6 +1,14 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  args:
+    dependency: transitive
+    description:
+      name: args
+      sha256: "7cf60b9f0cc88203c5a190b4cd62a99feea42759a7fa695010eb5de1c0b2252a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.0"
   async:
     dependency: transitive
     description:
@@ -174,6 +182,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.21"
+  flutter_svg:
+    dependency: "direct main"
+    description:
+      name: flutter_svg
+      sha256: "7b4ca6cf3304575fe9c8ec64813c8d02ee41d2afe60bcfe0678bcb5375d596a2"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.10+1"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -320,6 +336,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.0.0"
+  map_launcher:
+    dependency: "direct main"
+    description:
+      name: map_launcher
+      sha256: af59b9f79f641022e06761c9d4217c6c57b9ef9020af2fdb23155ec87af79e61
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.3.1"
   matcher:
     dependency: transitive
     description:
@@ -368,6 +392,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.0"
+  path_parsing:
+    dependency: transitive
+    description:
+      name: path_parsing
+      sha256: e3e67b1629e6f7e8100b367d3db6ba6af4b1f0bb80f64db18ef1fbabd2fa9ccf
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.1"
   path_provider:
     dependency: transitive
     description:
@@ -416,6 +448,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.3.0"
+  petitparser:
+    dependency: transitive
+    description:
+      name: petitparser
+      sha256: c15605cd28af66339f8eb6fbe0e541bfe2d1b72d5825efc6598f3e0a31b9ad27
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.2"
   platform:
     dependency: transitive
     description:
@@ -629,6 +669,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.4.2"
+  vector_graphics:
+    dependency: transitive
+    description:
+      name: vector_graphics
+      sha256: "32c3c684e02f9bc0afb0ae0aa653337a2fe022e8ab064bcd7ffda27a74e288e3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.11+1"
+  vector_graphics_codec:
+    dependency: transitive
+    description:
+      name: vector_graphics_codec
+      sha256: c86987475f162fadff579e7320c7ddda04cd2fdeffbe1129227a85d9ac9e03da
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.11+1"
+  vector_graphics_compiler:
+    dependency: transitive
+    description:
+      name: vector_graphics_compiler
+      sha256: "12faff3f73b1741a36ca7e31b292ddeb629af819ca9efe9953b70bd63fc8cd81"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.11+1"
   vector_math:
     dependency: transitive
     description:
@@ -669,6 +733,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.4"
+  xml:
+    dependency: transitive
+    description:
+      name: xml
+      sha256: b015a8ad1c488f66851d762d3090a21c600e479dc75e68328c52774040cf9226
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.5.0"
 sdks:
   dart: ">=3.4.0 <4.0.0"
   flutter: ">=3.22.0"

frontend/pubspec.yaml

@@ -45,6 +45,8 @@ dependencies:
   widget_to_marker: ^1.0.6
   provider: ^6.1.2
   auto_size_text: ^3.0.0
+  map_launcher: ^3.3.1
+  flutter_svg: ^2.0.10+1
 
 dev_dependencies:
   flutter_test: