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雰囲気でFlutterやってみた
Flutter Meetup Tokyo #1
2018/04/18 (Wed)
@syarihu
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Taichi Sato (@syarihu)
● Money Forward
○ Android Engineer
● TechBooster
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Taichi Sato (@syarihu)
● Android開発歴 7年くらい
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Taichi Sato (@syarihu)
● Android開発歴 7年くらい
● Flutter歴
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Taichi Sato (@syarihu)
● Android開発歴 7年くらい
● Flutter歴 3日くらい
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Flutter 気になるけど
よくわからん…
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そうだ、雰囲気でやってみよう
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昔つくった個人アプリ（の一部）を
Flutterで作ってみた
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愛工大シャトルバス時刻表
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これを
Flutterで
作ってみる
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やること
● Widgetに分解
● Widgetを配置
● APIから取得した結果を
Widgetに反映
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1. Widgetに分解
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Toolbar
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AppBar
Toolbar
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ViewPager
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ViewPager
TabBarView
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ListView
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ListView
ListView
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Bottom
NavigationView
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Bottom
NavigationView
Bottom
NavigationView
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2. Widgetを配置
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AppBar
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AppBar
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: '愛工大シャトルバス時刻表',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: '愛工大シャトルバス時刻表
'),
);
}
}
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AppBar
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: '愛工大シャトルバス時刻表',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: '愛工大シャトルバス時刻表
'),
);
}
}
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AppBar
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: '愛工大シャトルバス時刻表',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: '愛工大シャトルバス時刻表
'),
);
}
}
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AppBar
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: '愛工大シャトルバス時刻表',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: '愛工大シャトルバス時刻表
'),
);
}
}
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AppBar
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AppBar
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() =>
new _MyHomePageState();
}
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AppBar
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() =>
new _MyHomePageState();
}
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AppBar
class _MyHomePageState extends State {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
),
body: new Center(),
);
}
}
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AppBar
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TabBarView
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TabBarView
class _MyHomePageState extends State {
...
@override
Widget build(BuildContext context) {
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TabBarView
return new DefaultTabController(
length: 2,
child: new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
bottom: new TabBar(
tabs: [
new Tab(text: "愛工大ゆき"),
new Tab(text: "八草駅ゆき"),
],
),
),
body: new TabBarView(
children: _pages,
)));
}
}
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TabBarView
return new DefaultTabController(
length: 2,
child: new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
bottom: new TabBar(
tabs: [
new Tab(text: "愛工大ゆき"),
new Tab(text: "八草駅ゆき"),
],
),
),
body: new TabBarView(
children: _pages,
)));
}
}
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TabBarView
return new DefaultTabController(
length: 2,
child: new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
bottom: new TabBar(
tabs: [
new Tab(text: "愛工大ゆき"),
new Tab(text: "八草駅ゆき"),
],
),
),
body: new TabBarView(
children: _pages,
)));
}
}
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TabBarView
return new DefaultTabController(
length: 2,
child: new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
bottom: new TabBar(
tabs: [
new Tab(text: "愛工大ゆき"),
new Tab(text: "八草駅ゆき"),
],
),
),
body: new TabBarView(
children: _pages,
)));
}
}
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TabBarView
final List _pages = [
Column(
children: [
Padding(
padding: const EdgeInsets.all(32.0),
child: new Text("widget1"),
)
],
),
Column(
children: [
Padding(
padding: const EdgeInsets.all(32.0),
child: new Text("widget2"),
)
],
),
];
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TabBarView
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自分で作るしか無さそう…
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独自TabBarを作るには？
● TabBarはPreferredSizeWidgetを実装し
ている
● PreferredSizeWidgetを実装したクラスな
らいけそう
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CustomTabBar
class CustomTabBar extends StatelessWidget
implements PreferredSizeWidget {
final TabBar tabBar;
final String currentDate;
final String currentTimeTable;
CustomTabBar({
this.currentDate,
this.currentTimeTable,
this.tabBar
}) : super();
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CustomTabBar
class CustomTabBar extends StatelessWidget
implements PreferredSizeWidget {
final TabBar tabBar;
final String currentDate;
final String currentTimeTable;
CustomTabBar({
this.currentDate,
this.currentTimeTable,
this.tabBar
}) : super();
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CustomTabBar
class CustomTabBar extends StatelessWidget
implements PreferredSizeWidget {
final TabBar tabBar;
final String currentDate;
final String currentTimeTable;
CustomTabBar({
this.currentDate,
this.currentTimeTable,
this.tabBar
}) : super();
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CustomTabBar
class CustomTabBar extends StatelessWidget
implements PreferredSizeWidget {
final TabBar tabBar;
final String currentDate;
final String currentTimeTable;
CustomTabBar({
this.currentDate,
this.currentTimeTable,
this.tabBar
}) : super();
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CustomTabBar
@override
Size get preferredSize => new Size(0.0, 90.0);
@override
Widget build(BuildContext context) {
return new Column(
children: [
createCurrentStatus(),
tabBar
],
);
}
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CustomTabBar
@override
Size get preferredSize => new Size(0.0, 90.0);
@override
Widget build(BuildContext context) {
return new Column(
children: [
createCurrentStatus(),
tabBar
],
);
}
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CustomTabBar
@override
Size get preferredSize => new Size(0.0, 90.0);
@override
Widget build(BuildContext context) {
return new Column(
children: [
createCurrentStatus(),
tabBar
],
);
}
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CustomTabBar
@override
Size get preferredSize => new Size(0.0, 90.0);
@override
Widget build(BuildContext context) {
return new Column(
children: [
createCurrentStatus(),
tabBar
],
);
}
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CustomTabBar
Widget createCurrentStatus() {
return Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
createExpanded(currentDate),
createExpanded(currentTimeTable),
],
);
}
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CustomTabBar
Widget createCurrentStatus() {
return Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
createExpanded(currentDate),
createExpanded(currentTimeTable),
],
);
}
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CustomTabBar
Widget createCurrentStatus() {
return Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
createExpanded(currentDate),
createExpanded(currentTimeTable),
],
);
}
Widget A
(currentDate)
Widget B
(currentTimeTable)
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CustomTabBar
Expanded createExpanded(String text) {
return new Expanded(
flex: 1,
child: new Container(
decoration:
new BoxDecoration(
border: new Border.all(color: Colors.white)
),
child: ...
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CustomTabBar
Expanded createExpanded(String text) {
return new Expanded(
flex: 1,
child: new Container(
decoration:
new BoxDecoration(
border: new Border.all(color: Colors.white)
),
child: ...
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CustomTabBar
Expanded createExpanded(String text) {
return new Expanded(
flex: 1,
child: new Container(
decoration:
new BoxDecoration(
border: new Border.all(color: Colors.white)
),
child: ...
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CustomTabBar
child: new Padding(
padding: const EdgeInsets.all(2.0),
child: new MaterialButton(
onPressed: () {},
child: new Text(
text,
style: new TextStyle(
color: Colors.white
),
),
),
),
),
);
}
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CustomTabBar
child: new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
bottom: new CustomTabBar(
currentDate: "2018年4月16日（月）",
currentTimeTable: "Aダイヤ",
tabBar: new TabBar(
tabs: [
new Tab(text: "愛工大ゆき"),
new Tab(text: "八草駅ゆき"),
],
),
),
),
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CustomTabBar
child: new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
bottom: new CustomTabBar(
currentDate: "2018年4月16日（月）",
currentTimeTable: "Aダイヤ",
tabBar: new TabBar(
tabs: [
new Tab(text: "愛工大ゆき"),
new Tab(text: "八草駅ゆき"),
],
),
),
),
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CustomTabBar
child: new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
bottom: new CustomTabBar(
currentDate: "2018年4月16日（月）",
currentTimeTable: "Aダイヤ",
tabBar: new TabBar(
tabs: [
new Tab(text: "愛工大ゆき"),
new Tab(text: "八草駅ゆき"),
],
),
),
),
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CustomTabBar
child: new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
bottom: new CustomTabBar(
currentDate: "2018年4月16日（月）",
currentTimeTable: "Aダイヤ",
tabBar: new TabBar(
tabs: [
new Tab(text: "愛工大ゆき"),
new Tab(text: "八草駅ゆき"),
],
),
),
),
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CustomTabBar
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ListView
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ListView
static List createDataList() {
List list = List();
for (int i = 0; i < 100; i++) {
list.add("test$i");
}
return list;
}
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ListView
static List createDataList() {
List list = List();
for (int i = 0; i < 100; i++) {
list.add("test$i");
}
return list;
}
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ListView
static List createCards(List list) {
List cardList = new List();
list.forEach((s) {
cardList.add(new Card(
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Text(s),
)));
});
return cardList;
}
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ListView
static List createCards(List list) {
List cardList = new List();
list.forEach((s) {
cardList.add(new Card(
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Text(s),
)));
});
return cardList;
}
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ListView
static ListView createListView() {
return new ListView(
shrinkWrap: true,
padding: const EdgeInsets.all(20.0),
children: createCards(createDataList()),
);
}
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ListView
static ListView createListView() {
return new ListView(
shrinkWrap: true,
padding: const EdgeInsets.all(20.0),
children: createCards(createDataList()),
);
}
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ListView
final List _pages = [
createListView(),
createListView(),
];
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ListView
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3. APIから取得して
Widgetに反映
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APIからデータを取得する
● モデルを作る
● http.getで取ってくる
● 結果をWidgetに反映
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No content
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http.getで取ってくる
Future fetchPost() async {
final response = await http.get(
'http://api.syarihu.net/ait_timetable/timetables/');
final responseJson = json.decode(response.body);
return new Destinations.fromJson(responseJson);
}
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http.getで取ってくる
Future fetchPost() async {
final response = await http.get(
'http://api.syarihu.net/ait_timetable/timetables/');
final responseJson = json.decode(response.body);
return new Destinations.fromJson(responseJson);
}
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http.getで取ってくる
Future fetchPost() async {
final response = await http.get(
'http://api.syarihu.net/ait_timetable/timetables/');
final responseJson = json.decode(response.body);
return new Destinations.fromJson(responseJson);
}
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結果をWidgetに反映
static FutureBuilder createFutureBuilder(
int destination) {
return new FutureBuilder(
future: fetchPost(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return createListView(
snapshot.data.destinations[destination].timetables);
} else if (snapshot.hasError) {
return new Text("${snapshot.error}");
}
return new CircularProgressIndicator();
},
);
}
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結果をWidgetに反映
static FutureBuilder createFutureBuilder(
int destination) {
return new FutureBuilder(
future: fetchPost(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return createListView(
snapshot.data.destinations[destination].timetables);
} else if (snapshot.hasError) {
return new Text("${snapshot.error}");
}
return new CircularProgressIndicator();
},
);
}
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結果をWidgetに反映
static FutureBuilder createFutureBuilder(
int destination) {
return new FutureBuilder(
future: fetchPost(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return createListView(
snapshot.data.destinations[destination].timetables);
} else if (snapshot.hasError) {
return new Text("${snapshot.error}");
}
return new CircularProgressIndicator();
},
);
}
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結果をWidgetに反映
static FutureBuilder createFutureBuilder(
int destination) {
return new FutureBuilder(
future: fetchPost(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return createListView(
snapshot.data.destinations[destination].timetables);
} else if (snapshot.hasError) {
return new Text("${snapshot.error}");
}
return new CircularProgressIndicator();
},
);
}
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結果をWidgetに反映
static FutureBuilder createFutureBuilder(
int destination) {
return new FutureBuilder(
future: fetchPost(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return createListView(
snapshot.data.destinations[destination].timetables);
} else if (snapshot.hasError) {
return new Text("${snapshot.error}");
}
return new CircularProgressIndicator();
},
);
}
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結果をWidgetに反映
class _MyHomePageState extends State {
final List _pages = [
new ConstrainedBox(
constraints: const BoxConstraints.expand(),
child: createFutureBuilder(0),
),
new ConstrainedBox(
constraints: const BoxConstraints.expand(),
child: createFutureBuilder(1),
),
];
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結果をWidgetに反映
class _MyHomePageState extends State {
final List _pages = [
new ConstrainedBox(
constraints: const BoxConstraints.expand(),
child: createFutureBuilder(0),
),
new ConstrainedBox(
constraints: const BoxConstraints.expand(),
child: createFutureBuilder(1),
),
];
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APIから取得してWidgetに反映
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まとめ
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まとめ
● 標準のWidgetならわりと簡単になんでも
作れそう
● ちょっとでも凝ったもの作ろうとすると
Widgetをカスタマイズしないと
ダメそう
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まとめ
● 通信の部分もWidgetで作るとは思わな
かったので本当にすべてはWidget
だった（小並感）
● そんなに時間をかけずにある程度作れた
ので慣れればかなり良さそう
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技術書典４
● 日時 2018/04/22 (日) 11:00〜17:00
● 場所 秋葉原UDX アキバ・スクエア
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NOW & FUTURE
TechBooster
● Android
● Flutter
● Swift
● Kotlin のコルーチン
の動作原理など
モバイル技術に注目した
解説書です
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ありがとうございました