Add basic device picker.

lib/app/state.dart

@@ -3,6 +3,7 @@ import 'dart:convert';
 
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:logging/logging.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
 import '../../core/rpc.dart';
 import '../../core/state.dart';
@@ -57,24 +58,35 @@ class AttachedDeviceNotifier extends StateNotifier<List<DeviceNode>> {
 
 final currentDeviceProvider =
     StateNotifierProvider<CurrentDeviceNotifier, DeviceNode?>((ref) {
-  final provider = CurrentDeviceNotifier();
+  final provider = CurrentDeviceNotifier(ref.watch(prefProvider));
   ref.listen(attachedDevicesProvider, provider._updateAttachedDevices);
   return provider;
 });
 
 class CurrentDeviceNotifier extends StateNotifier<DeviceNode?> {
-  CurrentDeviceNotifier() : super(null);
+  static const String _lastDeviceSerial = 'APP_STATE_LAST_SERIAL';
+  final SharedPreferences _prefs;
+  CurrentDeviceNotifier(this._prefs) : super(null);
 
   _updateAttachedDevices(List<DeviceNode>? previous, List<DeviceNode> devices) {
     if (devices.isEmpty) {
       state = null;
     } else if (!devices.contains(state)) {
-      state = devices.first;
+      // Prefer last selected device
+      final serial = _prefs.getInt(_lastDeviceSerial) ?? -1;
+      state = devices.firstWhere(
+        (element) => element.info.serial == serial,
+        orElse: () => devices.first,
+      );
     }
   }
 
   setCurrentDevice(DeviceNode device) {
     state = device;
+    final serial = device.info.serial;
+    if (serial != null) {
+      _prefs.setInt(_lastDeviceSerial, serial);
+    }
   }
 }
 

lib/app/views/device_picker_dialog.dart

@@ -0,0 +1,63 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../about_page.dart';
+import '../models.dart';
+import '../state.dart';
+
+class DevicePickerDialog extends ConsumerWidget {
+  const DevicePickerDialog({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final device = ref.watch(currentDeviceProvider);
+    final devices = ref.watch(attachedDevicesProvider);
+
+    Widget _buildDeviceInfo(DeviceNode device) {
+      return Padding(
+        padding: const EdgeInsets.all(8.0),
+        child: Column(
+          children: [
+            Row(
+              children: [
+                const CircleAvatar(child: Text('YK')),
+                const SizedBox(width: 16.0),
+                Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(device.name),
+                    Text(
+                        'Version: ${device.info.version} Serial: ${device.info.serial}'),
+                  ],
+                ),
+              ],
+            ),
+            const Divider(),
+          ],
+        ),
+      );
+    }
+
+    return SimpleDialog(
+      //title: Text(device?.name ?? 'No YubiKey'),
+      children: [
+        if (device != null) _buildDeviceInfo(device),
+        ...devices.where((e) => e != device).map((e) => TextButton(
+              child: Text(e.name),
+              onPressed: () {
+                ref.read(currentDeviceProvider.notifier).setCurrentDevice(e);
+                Navigator.of(context).pop();
+              },
+            )),
+        const Divider(),
+        TextButton(
+            onPressed: () {
+              Navigator.of(context).push(
+                MaterialPageRoute(builder: (context) => const AboutPage()),
+              );
+            },
+            child: const Text('About Yubico Authenticator...'))
+      ],
+    );
+  }
+}

lib/app/views/main_page.dart

@@ -1,12 +1,12 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
+import 'device_picker_dialog.dart';
 import 'main_drawer.dart';
 import 'no_device_screen.dart';
 import 'device_info_screen.dart';
 import '../models.dart';
 import '../state.dart';
-import '../../about_page.dart';
 import '../../oath/views/oath_screen.dart';
 
 class MainPage extends ConsumerWidget {
@@ -34,8 +34,9 @@ class MainPage extends ConsumerWidget {
           IconButton(
             icon: const Icon(Icons.info),
             onPressed: () {
-              Navigator.of(context).push(
-                MaterialPageRoute(builder: (context) => const AboutPage()),
+              showDialog(
+                context: context,
+                builder: (context) => const DevicePickerDialog(),
               );
             },
           )