Add root certificate for Let's Encrypt in order to access Open Meteo on older devices.

android/app/src/main/AndroidManifest.xml

@@ -27,6 +27,9 @@
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
     <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM"/>
 
+    <!-- Allow internet to work. -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+
     <application
         android:label="Sunset Alarm"
         android:name="${applicationName}"

android/app/src/main/res/drawable-v21/launch_background.xml

@@ -10,3 +10,4 @@
             android:src="@mipmap/launch_image" />
     </item> -->
 </layer-list>
+

android/app/src/main/res/drawable/launch_background.xml

@@ -10,3 +10,4 @@
             android:src="@mipmap/launch_image" />
     </item> -->
 </layer-list>
+

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background"/>
+    <background android:drawable="@color/ic_launcher_background"/>
     <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-    <monochrome android:drawable="@mipmap/ic_launcher_foreground"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_monochrome"/>
 </adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background"/>
+    <background android:drawable="@color/ic_launcher_background"/>
     <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-    <monochrome android:drawable="@mipmap/ic_launcher_foreground"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_monochrome"/>
 </adaptive-icon>

android/app/src/main/res/values/ic_launcher_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#FFFFFF</color>
+</resources>

compile.sh

@@ -32,7 +32,7 @@ version=""
 for i in `grep version $app_details`; do
 	version="$i"
 done
-version="v${version// /_}"
+version="${version// /_}"
 
 if [[ -z $name || -z $version ]]; then
 	echo "ERROR: Could not retrieve name or version. name='$name' version='$version'"

lib/main.dart

@@ -12,6 +12,11 @@ import 'package:alarm/alarm.dart';
 
 import 'dart:convert';
 
+// For trusting Let's Encrypt on older devices (SDK 24, Android 7)
+//import 'dart:io';
+//import 'package:http/http.dart' as http;
+import 'package:flutter/services.dart' show rootBundle;
+
 /// TBD:
 /// - Add other languages (Spanish, Croatian)
 /// v1.1.0
@@ -22,6 +27,14 @@ import 'dart:convert';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
+
+  final certData = await rootBundle.load(
+    'media/certs/open-meteo-com_isrg-root-x1.pem',
+  );
+  SecurityContext.defaultContext.setTrustedCertificatesBytes(
+    certData.buffer.asUint8List(),
+  );
+
   tz.initializeTimeZones();
   await Alarm.init();
   runApp(const SunsetAlarmApp());
@@ -66,8 +79,8 @@ class HomeScreen extends StatefulWidget {
 class _HomeScreenState extends State<HomeScreen> {
   final _latController = TextEditingController();
   final _lngController = TextEditingController();
-  final _sunsetController = TextEditingController();
-  final _minutesController = TextEditingController(text: '30');
+  final _sunsetController = TextEditingController(text: "18:00");
+  final _minutesController = TextEditingController(text: "30");
 
   final FlutterLocalNotificationsPlugin _notifications =
       FlutterLocalNotificationsPlugin();
@@ -79,6 +92,7 @@ class _HomeScreenState extends State<HomeScreen> {
 
   String? _sunsetErrorText;
   String? _minuteErrorText;
+  bool _validTime = false;
 
   static const _alarmId = 1001;
 
@@ -107,15 +121,14 @@ class _HomeScreenState extends State<HomeScreen> {
   Future<void> _loadPrefs() async {
     final prefs = await SharedPreferences.getInstance();
     setState(() {
-      final lat = prefs.getDouble('lat');
-      final lng = prefs.getDouble('lng');
-      final sunset = prefs.getString('sunset_time');
+      _latController.text = prefs.getDouble('lat').toString();
+      _lngController.text = prefs.getDouble('lng').toString();
+      _sunsetController.text = prefs.getString('sunset_time').toString();
       _alarmEnabled = prefs.getBool('alarm_enabled') ?? false;
       _minutesBefore = prefs.getInt('minutes_before') ?? 30;
-      if (lat != null) _latController.text = lat.toString();
-      if (lng != null) _lngController.text = lng.toString();
-      if (sunset != null) _sunsetController.text = sunset;
-      _minutesController.text = '$_minutesBefore';
+      _minutesController.text = _minutesBefore.toString();
+      _plural = prefs.getString('plural').toString();
+      _validTime = prefs.getBool('valid_time') ?? false;
     });
     if (_alarmEnabled && _sunsetController.text.isNotEmpty) {
       _scheduleAlarm();
@@ -133,6 +146,8 @@ class _HomeScreenState extends State<HomeScreen> {
     }
     await prefs.setBool('alarm_enabled', _alarmEnabled);
     await prefs.setInt('minutes_before', _minutesBefore);
+    await prefs.setString('plural', _plural);
+    await prefs.setBool('valid_time', _validTime);
   }
 
   Future<void> _getGpsLocation() async {
@@ -327,18 +342,26 @@ class _HomeScreenState extends State<HomeScreen> {
     if (value) {
       await _scheduleAlarm();
     } else {
-      _alarmTimer?.cancel();
-      if (!Platform.isLinux) {
-        // Notification Method
-        if (ANDROID_USE_NOTIF) await _notifications.cancel(id: _alarmId);
-
-        // Alarm Method
-        if (ANDROID_USE_ALARM) await Alarm.stop(_alarmId);
-      }
-      _showSnack('Alarm Cancelled');
+      _stopAlarm();
     }
   }
 
+  Future<void> _stopAlarm() async {
+    if (Platform.isLinux) {
+      _alarmTimer?.cancel();
+    } else if (Platform.isAndroid) {
+      // Notification Method
+      if (ANDROID_USE_NOTIF) {
+        await _notifications.cancel(id: _alarmId);
+      }
+      // Alarm Method
+      if (ANDROID_USE_ALARM) {
+        await Alarm.stop(_alarmId);
+      }
+    }
+    _showSnack('Alarm Cancelled');
+  }
+
   void _showSnack(String msg) {
     ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(msg)));
   }
@@ -354,6 +377,7 @@ class _HomeScreenState extends State<HomeScreen> {
   }
 
   String? _validateTime(String? value) {
+    _validTime = false;
     if (value == null || !RegExp(r'^\d{2}:\d{2}$').hasMatch(value)) {
       return 'Use HH:MM Format';
     }
@@ -361,6 +385,7 @@ class _HomeScreenState extends State<HomeScreen> {
     final m = int.parse(value.substring(3, 5));
     if (h > 23) return 'Hour Must Be 0–23';
     if (m > 59) return 'Minute Must Be 0–59';
+    _validTime = true;
     return null; // valid
   }
 
@@ -462,6 +487,9 @@ class _HomeScreenState extends State<HomeScreen> {
                         ),
                       ),
                       onChanged: (v) {
+                        if (v == "") {
+                          _stopAlarm();
+                        }
                         final val = _validateTime(v);
                         if (val == null) {
                           _savePrefs();
@@ -532,17 +560,23 @@ class _HomeScreenState extends State<HomeScreen> {
 
                   // --- Toggle ---
                   Expanded(
-                    child: SwitchListTile(
-                      //title: const Text('Enable Sunset Alarm'),
-                      title: Text(_alarmEnabled ? 'Sunset Alarm Enabled' : ''),
-                      subtitle: Text(
-                        _alarmEnabled
-                            ? '${_minutesBefore} Minute${_plural} Before @ $_alarmDisplayTime'
-                            : '',
-                      ),
-                      value: _alarmEnabled,
-                      onChanged: _toggleAlarm,
-                    ),
+                    child:
+                        _validTime
+                            ? SwitchListTile(
+                              title: Text(
+                                _alarmEnabled ? 'Sunset Alarm Enabled' : "",
+                              ),
+                              subtitle: Text(
+                                _validTime
+                                    ? _alarmEnabled
+                                        ? '${_minutesBefore} Minute${_plural} Before @ $_alarmDisplayTime'
+                                        : ""
+                                    : "Add Time",
+                              ),
+                              value: _alarmEnabled,
+                              onChanged: _toggleAlarm,
+                            )
+                            : Center(child: Text("Sunset Time Invalid")),
                   ),
                 ],
               ),

media/certs/open-meteo-com_isrg-root-x1.pem

@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----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=
+-----END CERTIFICATE-----

pubspec.yaml

@@ -1,7 +1,7 @@
 name: sunset_alarm
 description: "Set an alarm to go off a specified time before sunset."
 publish_to: 'none'
-version: 1.0.0
+version: 1.0.1
 
 environment:
   sdk: ^3.7.2
@@ -23,3 +23,5 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+  assets:
+    - media/certs/