[android_alarm_manager] Migrated android_alarm_manager to support null safety #75233

packages/android_alarm_manager/CHANGELOG.md

@@ -1,3 +1,7 @@
+##  0.5.0-null-safety
+
+* Migrate to null safety.
+
 ## 0.4.5+20
 
 * Update the example app: remove the deprecated `RaisedButton` and `FlatButton` widgets.

packages/android_alarm_manager/example/lib/main.dart

@@ -22,7 +22,7 @@ const String isolateName = 'isolate';
 final ReceivePort port = ReceivePort();
 
 /// Global [SharedPreferences] object.
-SharedPreferences prefs;
+SharedPreferences? prefs;
 
 Future<void> main() async {
   // TODO(bkonyi): uncomment
@@ -35,8 +35,8 @@ Future<void> main() async {
     isolateName,
   );
   prefs = await SharedPreferences.getInstance();
-  if (!prefs.containsKey(countKey)) {
-    await prefs.setInt(countKey, 0);
+  if (!prefs!.containsKey(countKey)) {
+    await prefs!.setInt(countKey, 0);
   }
   runApp(AlarmManagerExampleApp());
 }
@@ -54,8 +54,8 @@ class AlarmManagerExampleApp extends StatelessWidget {
 }
 
 class _AlarmHomePage extends StatefulWidget {
-  _AlarmHomePage({Key key, this.title}) : super(key: key);
-  final String title;
+  _AlarmHomePage({Key? key, this.title}) : super(key: key);
+  final String? title;
 
   @override
   _AlarmHomePageState createState() => _AlarmHomePageState();
@@ -78,15 +78,15 @@ class _AlarmHomePageState extends State<_AlarmHomePage> {
     print('Increment counter!');
 
     // Ensure we've loaded the updated count from the background isolate.
-    await prefs.reload();
+    await prefs!.reload();
 
     setState(() {
       _counter++;
     });
   }
 
   // The background
-  static SendPort uiSendPort;
+  static SendPort? uiSendPort;
 
   // The callback for our alarm
   static Future<void> callback() async {
@@ -107,7 +107,7 @@ class _AlarmHomePageState extends State<_AlarmHomePage> {
     final textStyle = Theme.of(context).textTheme.headline4;
     return Scaffold(
       appBar: AppBar(
-        title: Text(widget.title),
+        title: Text(widget.title!),
       ),
       body: Center(
         child: Column(
@@ -125,7 +125,7 @@ class _AlarmHomePageState extends State<_AlarmHomePage> {
                   style: textStyle,
                 ),
                 Text(
-                  prefs.getInt(countKey).toString(),
+                  prefs!.getInt(countKey).toString(),
                   key: ValueKey('BackgroundCountText'),
                   style: textStyle,
                 ),
@@ -140,7 +140,7 @@ class _AlarmHomePageState extends State<_AlarmHomePage> {
                 await AndroidAlarmManager.oneShot(
                   const Duration(seconds: 5),
                   // Ensure we have a unique alarm ID.
-                  Random().nextInt(pow(2, 31)),
+                  Random().nextInt(pow(2, 31).toInt()),
                   callback,
                   exact: true,
                   wakeup: true,

packages/android_alarm_manager/example/pubspec.yaml

@@ -23,5 +23,5 @@ flutter:
   uses-material-design: true
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: '>=2.12.0-0 <3.0.0'
   flutter: ">=1.12.13+hotfix.5 <2.0.0"

packages/android_alarm_manager/lib/android_alarm_manager.dart

@@ -31,7 +31,7 @@ void _alarmManagerCallbackDispatcher() {
 
     // PluginUtilities.getCallbackFromHandle performs a lookup based on the
     // callback handle and returns a tear-off of the original callback.
-    final Function closure = PluginUtilities.getCallbackFromHandle(handle);
+    final Function? closure = PluginUtilities.getCallbackFromHandle(handle);
 
     if (closure == null) {
       print('Fatal: could not find callback');
@@ -71,13 +71,13 @@ class AndroidAlarmManager {
   // Callback used to get the handle for a callback. It's
   // [PluginUtilities.getCallbackHandle] by default.
   static _GetCallbackHandle _getCallbackHandle =
-      (Function callback) => PluginUtilities.getCallbackHandle(callback);
+      (Function callback) => PluginUtilities.getCallbackHandle(callback)!;
 
   /// This is exposed for the unit tests. It should not be accessed by users of
   /// the plugin.
   @visibleForTesting
   static void setTestOverides(
-      {_Now now, _GetCallbackHandle getCallbackHandle}) {
+      {_Now? now, _GetCallbackHandle? getCallbackHandle}) {
     _now = (now ?? _now);
     _getCallbackHandle = (getCallbackHandle ?? _getCallbackHandle);
   }
@@ -93,7 +93,7 @@ class AndroidAlarmManager {
     if (handle == null) {
       return false;
     }
-    final bool r = await _channel.invokeMethod<bool>(
+    final bool? r = await _channel.invokeMethod<bool>(
         'AlarmService.start', <dynamic>[handle.toRawHandle()]);
     return r ?? false;
   }
@@ -211,7 +211,7 @@ class AndroidAlarmManager {
     if (handle == null) {
       return false;
     }
-    final bool r =
+    final bool? r =
         await _channel.invokeMethod<bool>('Alarm.oneShotAt', <dynamic>[
       id,
       alarmClock,
@@ -262,7 +262,7 @@ class AndroidAlarmManager {
     Duration duration,
     int id,
     Function callback, {
-    DateTime startAt,
+    DateTime? startAt,
     bool exact = false,
     bool wakeup = false,
     bool rescheduleOnReboot = false,
@@ -278,7 +278,7 @@ class AndroidAlarmManager {
     if (handle == null) {
       return false;
     }
-    final bool r = await _channel.invokeMethod<bool>(
+    final bool? r = await _channel.invokeMethod<bool>(
         'Alarm.periodic', <dynamic>[
       id,
       exact,
@@ -299,7 +299,7 @@ class AndroidAlarmManager {
   /// Returns a [Future] that resolves to `true` on success and `false` on
   /// failure.
   static Future<bool> cancel(int id) async {
-    final bool r =
+    final bool? r =
         await _channel.invokeMethod<bool>('Alarm.cancel', <dynamic>[id]);
     return (r == null) ? false : r;
   }

packages/android_alarm_manager/pubspec.yaml

@@ -4,7 +4,7 @@ description: Flutter plugin for accessing the Android AlarmManager service, and
 # 0.4.y+z is compatible with 1.0.0, if you land a breaking change bump
 # the version to 2.0.0.
 # See more details: https://github.com/flutter/flutter/wiki/Package-migration-to-1.0.0
-version: 0.4.5+20
+version: 0.5.0-null-safety
 homepage: https://github.com/flutter/plugins/tree/master/packages/android_alarm_manager
 
 dependencies:
@@ -24,5 +24,5 @@ flutter:
         pluginClass: AndroidAlarmManagerPlugin
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: '>=2.12.0-0 <3.0.0'
   flutter: ">=1.12.13+hotfix.5"