import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
void main() {
runApp(
new MaterialApp(home: MyApp()),
);
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
late FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin;
@override
initState() {
super.initState();
// initialise the plugin. app_icon needs to be a added as a drawable resource to the Android head project
// If you have skipped STEP 3 then change app_icon to @mipmap/ic_launcher
var initializationSettingsAndroid =
const AndroidInitializationSettings('icon');
var initializationSettingsIOS = IOSInitializationSettings();
var initializationSettings = InitializationSettings(
android: initializationSettingsAndroid, iOS: initializationSettingsIOS);
flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
//flutterLocalNotificationsPlugin.initialize(initializationSettings, onSelectNotification);
flutterLocalNotificationsPlugin.initialize(initializationSettings,
onSelectNotification: onSelectNotification);
}
Future _showNotificationWithoutSound() async {
var androidPlatformChannelSpecifics = const AndroidNotificationDetails(
'channel id', 'channel name',
playSound: false, importance: Importance.max, priority: Priority.high);
var iOSPlatformChannelSpecifics =
IOSNotificationDetails(presentSound: false);
var platformChannelSpecifics = NotificationDetails(
android: androidPlatformChannelSpecifics,
iOS: iOSPlatformChannelSpecifics);
await flutterLocalNotificationsPlugin.show(
0,
'Title',
'Content',
platformChannelSpecifics,
payload: 'No_Sound',
);
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Plugin example app'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
RaisedButton(
onPressed: _showNotificationWithoutSound,
child: Text('Show Notification Without Sound'),
),
],
),
),
),
);
}
void onSelectNotification(String? payload) async { // when pressed the notification
showDialog(
context: context,
builder: (_) {
return new AlertDialog(
title: Text("PayLoad"),
content: Text("Payload : $payload"),
);
},
);
}
}
2022年7月21日星期四
Local Notification Code
2022年7月20日星期三
Check flutter version 3up? or not
enum AuthException {
invalidEmail('Invalid email'),
emailAlreadyInUse('Email already in use'),
weakPassword('Password is too weak'),
wrongPassword('Wrong password');
const AuthException(this.message);
final String message;
}
//dart 2.17 only
//lower than dart 2.17 cannot compile and error
Center the children in Row with Spacer() with wrap prevent overflow
Row(
children: [
Spacer(flex: 1),
Container(width: 15,),
FaIcon(
FontAwesomeIcons.solidCheckCircle,
color: FlutterFlowTheme.of(context).primaryColor,
size: 23,
),
Container(width: 10,),
Expanded(
flex: 4,
child: Text(
'tfjftjftgjftgjfgj',
textAlign: TextAlign.left,
style: FlutterFlowTheme.of(context).bodyText1,
),
),
Spacer(flex: 1)
],
),
with wrap
prevent overflow
flex
2022年7月19日星期二
Container padding EdgeInsets fromLTRB
Container(
padding: EdgeInsets.fromLTRB(20, 0, 20, 0),
===================
class PaddingTestRoute extends StatelessWidget {
const PaddingTestRoute({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Padding(
//上下左右各添加16像素補白
padding: const EdgeInsets.all(16),
child: Column(
//顯式指定對齊方式為左對齊，排除對齊干擾
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: const <Widget>[
Padding(
//左邊添加8像素補白
padding: EdgeInsets.only(left: 8),
child: Text("Hello world"),
),
Padding(
//上下各添加8像素補白
padding: EdgeInsets.symmetric(vertical: 8),
child: Text("I am Jack"),
),
Padding(
// 分別指定四個方向的補白
padding: EdgeInsets.fromLTRB(20, 0, 20, 20),
child: Text("Your friend"),
)
],
),
);
}
}
2022年7月3日星期日
Flutter image loading builder example
Image.network(
/* Other code */ loadingBuilder: (context, child, loadingProgress) { if (loadingProgress == null) return child; return const Center(child: Text('Loading...')); // You can use LinearProgressIndicator, CircularProgressIndicator, or a GIF instead }, ),2022年7月1日星期五
loop & list [ ] , map, where, reduce, every, any, for in
Create a list with loop in 1 line
[ for ( var i in text ) Text(i.toString()) ]
----------------------------------------------------------------------------
Mapping a list
myList.map((item){
return item * item;
}).toList()
----------------------------------------------------------------------------
Where
List myList = ['apple','banana','cat','dog','egg','face','good'];
var result = myList.where((item){
return item.contains('o');
});
print(result.toList()); //[dog, good]
----------------------------------------------------------------------------
Reduce example 1 - accumulate
List myList = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
int result = myList.reduce((accumulator, currentElement){
return accumulator + currentElement;
});
print(result); // 55
----------------------------------------------------------------------------
Reduce example 2 - find max
List myList = [2,9,4,6,1,3,9,4,0,2];
int result = myList.reduce((max, currentElement){
return currentElement>max?currentElement:max;
});
print(result); // 9
----------------------------------------------------------------------------
Every - every item < 5 ?
List myList = [3,2,1,3,2,3];
bool result = myList.every((item){
return item < 5;
});
print(result); //true
----------------------------------------------------------------------------
Any - Is any number less than zero?
List myList = [-1, 0, 1, 2, 3, 4, 5];
bool result = myList.any((item){
return item < 0;
});
print(result); // true
----------------------------------------------------------------------------
for…in loop
List myList = [1, 2, 3, 4, 5];
for(int i in myList){
print(i); //1 2 3 4 5
}
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