https://qiita.com/kimuradesu/items/b74c4908efb282d16a46 ::blazor with firebase
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://www.flutter-study.dev/ フラッターではじめるアプリ開発（ベータ版でWebもOK）
https://airhole.ymegane.org/flutter-for-web/ いまさらでもないが
ちなみに工学社の本は参考程度 上記のサイトのほうがまし
ツヤノの本は、firebase記事はないが、それ以外は充実 (とくにカメラ利用）
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いろいろあたってなんとか動いた記録
まず最新のflutter_core,cloud_firestoreをpub.get
---------------------------------------------------------------- pubspec.yaml
name: my_flutter_app
description: A new Flutter application.
# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1
environment:
sdk: ">=2.7.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^1.0.0
firebase_core: "^0.7.0"
cloud_firestore: "^0.16.0"
dev_dependencies:
flutter_test:
sdk: flutter
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
# The following section is specific to Flutter.
flutter:
# The following line ensures that the Material Icons font is
# included with your application, so that you can use the icons in
# the material Icons class.
uses-material-design: true
# To add assets to your application, add an assets section, like this:
# assets:
# - images/a_dot_burr.jpeg
# - images/a_dot_ham.jpeg
# An image asset can refer to one or more resolution-specific "variants", see
# https://flutter.dev/assets-and-images/#resolution-aware.
# For details regarding adding assets from package dependencies, see
# https://flutter.dev/assets-and-images/#from-packages
# To add custom fonts to your application, add a fonts section here,
# in this "flutter" section. Each entry in this list should have a
# "family" key with the font family name, and a "fonts" key with a
# list giving the asset and other descriptors for the font. For
# example:
# fonts:
# - family: Schyler
# fonts:
# - asset: fonts/Schyler-Regular.ttf
# - asset: fonts/Schyler-Italic.ttf
# style: italic
# - family: Trajan Pro
# fonts:
# - asset: fonts/TrajanPro.ttf
# - asset: fonts/TrajanPro_Bold.ttf
# weight: 700
#
# For details regarding fonts from package dependencies,
# see https://flutter.dev/custom-fonts/#from-packages
------------------------------------------------------android-package-name for firebase is com.example.my_flutter_app(my_flutter_appというflutter project nameから導出される）
できたjsonをmy_flutter_app/android/appに転送
firestoreにbooksというコレクションを作りauthor,titleの項目をつくり入れ込んでおく
----------------------------------------------------- main.dart
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_core/firebase_core.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyHomePage());
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
var count = 1;
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Firestore Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(
title: Text('Flutter Firestore Demo'),
),
body: createListView(),
floatingActionButton: FloatingActionButton(
onPressed: () {
// Firestore 上にデータを追加
//
FirebaseFirestore.instance.collection('books').add({
'title': 'タイトル$count',
'author': '著者$count',
});
count += 1;
},
child: Icon(Icons.add),
),
),
);
}
createListView() {
FirebaseFirestore.instance.collection('books').snapshots().listen((data) {
print(data);
});
return StreamBuilder(
stream: FirebaseFirestore.instance.collection('books').snapshots(),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
// エラーの場合
if (snapshot.hasError) {
return Text('Error: ${snapshot.error}');
}
// 通信中の場合
switch (snapshot.connectionState) {
case ConnectionState.waiting:
return Text('Loading ...');
default:
return ListView(
children: snapshot.data.docs.map((DocumentSnapshot document) {
return new ListTile(
title: new Text(document['title']),
subtitle: new Text(document['author']),
);
}).toList(),
);
}
},
);
}
}
----------------------------------------------------------navigation ex
import 'package:flutter/material.dart';
void main() =>
runApp(MaterialApp(
initialRoute: '/first',
routes: <String, WidgetBuilder> {
'/first':(BuildContext context) => FirstRoute(),
'/second': (BuildContext context) => SecondRoute(),
}
));
class FirstRoute extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('First Route'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
RaisedButton(
onPressed: () {
Navigator.push(context,
MaterialPageRoute(
builder: (context) => SecondRoute()
));
},
child: Text('push here',
style: TextStyle(fontSize: 20),
)),
],),),);
}
}
class SecondRoute extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Second Route'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
RaisedButton(
onPressed: () {
Navigator.pop(context);
},
child: Text('push here',
style: TextStyle(fontSize: 20),
)),
],),),);
}
}
