Many minor improvements

lib/pages/devicelist.dart

@@ -1,9 +1,13 @@
+import 'dart:io' show Platform;
+
 import 'package:flutter/material.dart';
 import 'package:flutter_speed_dial/flutter_speed_dial.dart';
-import 'package:liteauthconfig/appconfig.dart';
+import 'package:liteauthconfig/models/appconfig.dart';
 import 'package:liteauthconfig/l10n/app_localizations.dart';
 import 'package:liteauthconfig/pages/deviceinfo.dart';
 import 'package:liteauthconfig/pages/registerpage.dart';
+import 'package:nfc_manager/nfc_manager.dart';
+import 'package:nfc_manager_ndef/nfc_manager_ndef.dart';
 
 class DeviceListPage extends StatefulWidget {
   const DeviceListPage({super.key});
@@ -14,11 +18,35 @@ class DeviceListPage extends StatefulWidget {
 
 class _DeviceListPageState extends State<DeviceListPage> {
   List<Device> devices = [];
+  NfcAvailability? availability;
 
   @override
   void initState() {
     super.initState();
     refreshList();
+    checkNfc();
+  }
+
+  Future checkNfc() async {
+    if (!(Platform.isAndroid || Platform.isIOS)) return;
+
+    availability = await NfcManager.instance.checkAvailability();
+
+    if (availability != NfcAvailability.enabled) return;
+
+    NfcManager.instance.startSession(
+      pollingOptions: {NfcPollingOption.iso14443},
+      onDiscovered: (NfcTag tag) async {
+        final Ndef? ndef = Ndef.from(tag);
+
+        if (ndef == null) {
+          print("This tag is not compatible with NDEF.");
+          return;
+        }
+
+        print(ndef);
+      },
+    );
   }
 
   void refreshList() {
@@ -34,34 +62,65 @@ class _DeviceListPageState extends State<DeviceListPage> {
 
     return Scaffold(
       appBar: AppBar(title: Text(appLocal.deviceList)),
-      body: Visibility(
-        visible: devices.isEmpty,
-        replacement: ListView.builder(
-          itemBuilder: (context, index) {
-            final dev = devices[index];
-
-            return ListTile(
-              title: Text(dev.name),
-              onTap: () {
-                Navigator.push(
-                  context,
-                  MaterialPageRoute(
-                    builder: (context) => DeviceInfoPage(deviceIndex: index),
+      body: SingleChildScrollView(
+        child: Column(
+          children: [
+            Padding(
+              padding: EdgeInsetsGeometry.all(8),
+              child: switch (availability) {
+                null => SizedBox(),
+                NfcAvailability.enabled => Card(
+                  child: ListTile(
+                    title: Text(appLocal.nfcReady),
+                    subtitle: Text(appLocal.nfcReadyDescription),
                   ),
-                ).then((_) => refreshList());
+                ),
+                NfcAvailability.disabled => Card(
+                  child: ListTile(
+                    title: Text(appLocal.nfcDisabled),
+                    subtitle: Text(appLocal.nfcRequired),
+                  ),
+                ),
+                NfcAvailability.unsupported => Card(
+                  child: ListTile(
+                    title: Text(appLocal.nfcUnsupported),
+                    subtitle: Text(appLocal.nfcRequired),
+                  ),
+                ),
               },
-            );
-          },
-          itemCount: devices.length,
-          shrinkWrap: true,
-        ),
-        child: Padding(
-          padding: const EdgeInsets.all(16.0),
-          child: Text(
-            appLocal.noDevices,
-            textAlign: TextAlign.center,
-            style: appTheme.textTheme.bodyLarge,
-          ),
+            ),
+            Visibility(
+              visible: devices.isEmpty,
+              replacement: ListView.builder(
+                itemBuilder: (context, index) {
+                  final dev = devices[index];
+
+                  return ListTile(
+                    title: Text(dev.name),
+                    onTap: () {
+                      Navigator.push(
+                        context,
+                        MaterialPageRoute(
+                          builder: (context) =>
+                              DeviceInfoPage(deviceIndex: index),
+                        ),
+                      ).then((_) => refreshList());
+                    },
+                  );
+                },
+                itemCount: devices.length,
+                shrinkWrap: true,
+              ),
+              child: Padding(
+                padding: const EdgeInsets.all(16.0),
+                child: Text(
+                  appLocal.noDevices,
+                  textAlign: TextAlign.center,
+                  style: appTheme.textTheme.bodyLarge,
+                ),
+              ),
+            ),
+          ],
         ),
       ),
       floatingActionButton: SpeedDial(
@@ -77,7 +136,9 @@ class _DeviceListPageState extends State<DeviceListPage> {
             ),
             onTap: () {
               Navigator.of(context)
-                  .push(MaterialPageRoute(builder: (context) => RegisterPage(true)))
+                  .push(
+                    MaterialPageRoute(builder: (context) => RegisterPage(true)),
+                  )
                   .then((_) => refreshList());
             },
           ),
@@ -90,9 +151,13 @@ class _DeviceListPageState extends State<DeviceListPage> {
             ),
             onTap: () {
               Navigator.of(context)
-                  .push(MaterialPageRoute(builder: (context) => RegisterPage(false)))
+                  .push(
+                    MaterialPageRoute(
+                      builder: (context) => RegisterPage(false),
+                    ),
+                  )
                   .then((_) => refreshList());
-            }
+            },
           ),
         ],
         child: const Icon(Icons.add),