使用createScheduledNotification（）和showNotification（）可以但使用 createDailyNotification（）给出以下错误。
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E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): Failed to handle method call
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): java.lang.NullPointerException: Attempt to invoke virtual method 'long java.lang.Long.longValue()' on a null object reference
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.repeatNotification(FlutterLocalNotificationsPlugin.java:305)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.repeat(FlutterLocalNotificationsPlugin.java:743)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.onMethodCall(FlutterLocalNotificationsPlugin.java:700)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:231)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:93)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:642)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at android.os.MessageQueue.next(MessageQueue.java:336)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at android.os.Looper.loop(Looper.java:174)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at android.app.ActivityThread.main(ActivityThread.java:7356)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
E/MethodChannel#dexterous.com/flutter/local_notifications( 6909): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
I/flutter ( 6909): PlatformException(error, Attempt to invoke virtual method 'long java.lang.Long.longValue()' on a null object reference, null)
I/flutter ( 6909): Instance of 'Time'Instance of 'AndroidNotificationDetails'Instance of 'IOSNotificationDetails'Instance of 'NotificationDetails'
I/flutter ( 6909): notification payload:
请参见下面的代码，运行flutter doctor -v不会出错！**
import 'dart:async';
import 'dart:ui';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin;
class NotificationHomePage extends StatefulWidget {
@override
_NotificationHomePageState createState() => _NotificationHomePageState();
}
class _NotificationHomePageState extends State<NotificationHomePage> {
FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
FlutterLocalNotificationsPlugin();
var initializationSettingsAndroid;
var initializationSettingsIOS;
var initializationSettings;
var androidPlatformChannelSpecifics = AndroidNotificationDetails(
'repeatDailyAtTime_channel_id_ielts',
'repeatDailyAtTime_channel_name_ielts',
'repeatDailyAtTime_description_ielts');
var iOSPlatformChannelSpecifics = IOSNotificationDetails();
var platformChannelSpecifics;
@override
void initState() {
// TODO: implement initState
super.initState();
initializationSettingsAndroid = AndroidInitializationSettings('app_icon');
initializationSettingsIOS = IOSInitializationSettings(
onDidReceiveLocalNotification: onDidReceiveLocalNotification);
initializationSettings = InitializationSettings(
initializationSettingsAndroid, initializationSettingsIOS);
platformChannelSpecifics = NotificationDetails(
androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
flutterLocalNotificationsPlugin
.initialize(
initializationSettings,
onSelectNotification: onSelectNotification,
)
.then((init) {
setupNotification();
});
}
Future onSelectNotification(String payload) async {
if (payload != null) {
debugPrint('notification payload: ' + payload);
} else {
print('null payload');
}
}
Future onDidReceiveLocalNotification(
int id, String title, String body, String payload) async {
// display a dialog with the notification details, tap ok to go to another page
showDialog(
context: context,
builder: (context) => AlertDialog(
content: Text('dont forget'),
actions: [
FlatButton(
child: Text('Ok'),
onPressed: () {
Navigator.of(context).pop();
},
),
],
));
}
String _toTwoDigitString(int value) {
return value.toString().padLeft(2, '0');
}
Future<void> createNotifications() async {
var time = Time(20, 15, 10);
var time2 = Time(21, 00, 10);
await flutterLocalNotificationsPlugin.showDailyAtTime(
0, 'IELTS ', 'Time to learn', time, platformChannelSpecifics);
await flutterLocalNotificationsPlugin.showDailyAtTime(
1, 'IELTS', 'Time to learn', time2, platformChannelSpecifics);
}
Future<void> createDailyNotification() async {
var time = new Time(01, 08, 00);
try {
await flutterLocalNotificationsPlugin.showDailyAtTime(
1,
'show daily title',
'Daily notification shown at approximately ${_toTwoDigitString(time.hour)}:${_toTwoDigitString(time.minute)}:${_toTwoDigitString(time.second)}',
time,
platformChannelSpecifics);
} catch (e) {
print(e.toString());
}
print(time.toString() +
androidPlatformChannelSpecifics.toString() +
iOSPlatformChannelSpecifics.toString() +
platformChannelSpecifics.toString());
}
Future<void> createWeeklyNotification() async {
var time = new Time(10, 0, 0);
await flutterLocalNotificationsPlugin.showWeeklyAtDayAndTime(
0,
'show weekly title',
'Weekly notification shown on Monday at approximately ${_toTwoDigitString(time.hour)}:${_toTwoDigitString(time.minute)}:${_toTwoDigitString(time.second)}',
Day.Monday,
time,
platformChannelSpecifics);
}
Future<void> createScheduledNotification() async {
var scheduledNotificationDateTime =
new DateTime.now().add(new Duration(seconds: 5));
var androidPlatformChannelSpecifics = new AndroidNotificationDetails(
'your other channel id',
'your other channel name',
'your other channel description');
var iOSPlatformChannelSpecifics = new IOSNotificationDetails(
presentAlert: true, presentBadge: true, presentSound: true);
NotificationDetails platformChannelSpecifics = new NotificationDetails(
androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
await flutterLocalNotificationsPlugin.schedule(
0,
'Minerva Time',
'Minerva Time!!!',
scheduledNotificationDateTime,
platformChannelSpecifics);
}
Future<void> createPerNotification() async {
// Show a notification every minute with the first appearance happening a minute after invoking the method
await flutterLocalNotificationsPlugin.periodicallyShow(0, 'repeating title',
'repeating body', RepeatInterval.EveryMinute, platformChannelSpecifics);
}
showNotification() async {
await flutterLocalNotificationsPlugin.show(
0, 'plain title', 'plain body', platformChannelSpecifics,
payload: 'item x');
}
Future<void> setupNotification() async {
try {
await createScheduledNotification();
//await createDailyNotification();
//await showNotification();
//await createNotifications();
} catch (e) {
print(e.toString());
}
createDailyNotification();
//createWeeklyNotification();
createScheduledNotification();
}
cancellAllNotifications() async {
await flutterLocalNotificationsPlugin.cancelAll();
}
@override
Widget build(BuildContext context) {
return Container(
child: Center(
child: Column(
children: <Widget>[
Text(
'hello world notifi',
style: TextStyle(fontSize: 25),
),
FlatButton(
child: Text('press'),
onPressed: () {
cancellAllNotifications();
},
)
],
),
),
);
}
}