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Merged
knopp merged 5 commits into from
Jan 23, 2026
Merged

flutter_tools: Update app template. #2

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4b185e3
Update app template for macOS
knopp Jan 23, 2026
89b3612
iOS
knopp Jan 23, 2026
4d2c4b2
android + tests
knopp Jan 23, 2026
ff3f256
windows
knopp Jan 23, 2026
2264efc
linux
knopp Jan 23, 2026
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47 changes: 47 additions & 0 deletions ...mplates/app/android-kotlin.tmpl/app/src/main/kotlin/androidIdentifier/Application.kt.tmpl
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@@ -0,0 +1,47 @@
package {{androidIdentifier}}

import io.flutter.FlutterInjector
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.embedding.engine.FlutterEngineCache
import io.flutter.embedding.engine.dart.DartExecutor

class Application : android.app.Application() {

companion object {
// Use a constant key so Activities/Services can fetch the engine later.
const val ENGINE_ID = "headless_engine"
}

private var engine: FlutterEngine? = null

override fun onCreate() {
super.onCreate()

// Ensure Flutter is initialized (loads engine resources, etc.)
// Usually automatic, but doing it explicitly makes startup behavior predictable.
FlutterInjector.instance().flutterLoader().startInitialization(this)
FlutterInjector.instance().flutterLoader().ensureInitializationComplete(this, null)

// Create a FlutterEngine not tied to any Activity.
val flutterEngine = FlutterEngine(this)

// Start executing Dart code. This runs the "main()" of your Flutter app by default.
val entrypoint = DartExecutor.DartEntrypoint.createDefault()
flutterEngine.dartExecutor.executeDartEntrypoint(entrypoint)

// Optionally: register MethodChannels / EventChannels here, once the engine exists.
// Example: setupChannels(flutterEngine)

// Cache it so other components can reuse it without recreating.
FlutterEngineCache.getInstance().put(ENGINE_ID, flutterEngine)

engine = flutterEngine
}

override fun onTerminate() {
// onTerminate is not reliable in production, but safe to keep for emulators/tests.
engine?.destroy()
engine = null
super.onTerminate()
}
}
4 changes: 2 additions & 2 deletions ...plates/app/android-kotlin.tmpl/app/src/main/kotlin/androidIdentifier/MainActivity.kt.tmpl
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@@ -1,5 +1,5 @@
package {{androidIdentifier}}

import io.flutter.embedding.android.FlutterActivity
import android.app.Activity

class MainActivity : FlutterActivity()
class MainActivity : Activity()
2 changes: 1 addition & 1 deletion packages/flutter_tools/templates/app/android.tmpl/app/src/main/AndroidManifest.xml.tmpl
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@@ -1,7 +1,7 @@
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
<application
android:label="{{projectName}}"
android:name="${applicationName}"
android:name=".Application"
android:icon="@mipmap/ic_launcher">
<activity
android:name=".MainActivity"
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11 changes: 6 additions & 5 deletions packages/flutter_tools/templates/app/ios.tmpl/Runner/AppDelegate.swift
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Expand Up @@ -2,15 +2,16 @@ import Flutter
import UIKit

@main
@objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
@objc class AppDelegate: FlutterAppDelegate {
var engine: FlutterEngine?

override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
engine = FlutterEngine(name: "project", project: nil)
GeneratedPluginRegistrant.register(with: engine!)
engine?.run(withEntrypoint:nil)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}

func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)
}
}
273 changes: 0 additions & 273 deletions packages/flutter_tools/templates/app/lib/main.dart.tmpl
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@@ -1,275 +1,2 @@
import 'package:flutter/material.dart';
{{#withEmptyMain}}

void main() {
runApp(const MainApp());
}

class MainApp extends StatelessWidget {
const MainApp({super.key});

@override
Widget build(BuildContext context) {
return const MaterialApp(
home: Scaffold(
body: Center(
child: Text('Hello World!'),
),
),
);
}
}
{{/withEmptyMain}}
{{^withEmptyMain}}
{{#withPlatformChannelPluginHook}}
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:{{pluginProjectName}}/{{pluginProjectName}}.dart';
{{/withPlatformChannelPluginHook}}
{{#withFfi}}
import 'dart:async';

import 'package:{{pluginProjectName}}/{{pluginProjectName}}.dart' as {{pluginProjectName}};
{{/withFfi}}

void main() {
runApp(const MyApp());
}

{{^withPluginHook}}
class MyApp extends StatelessWidget {
const MyApp({super.key});

// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// TRY THIS: Try running your application with "flutter run". You'll see
// the application has a purple toolbar. Then, without quitting the app,
// try changing the seedColor in the colorScheme below to Colors.green
// and then invoke "hot reload" (save your changes or press the "hot
// reload" button in a Flutter-supported IDE, or press "r" if you used
// the command line to start the app).
//
// Notice that the counter didn't reset back to zero; the application
// state is not lost during the reload. To reset the state, use hot
// restart instead.
//
// This works for code too, not just values: Most code changes can be
// tested with just a hot reload.
colorScheme: .fromSeed(seedColor: Colors.deepPurple),
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}

class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});

// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.

// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".

final String title;

@override
State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;

void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}

@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// TRY THIS: Try changing the color here to a specific color (to
// Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
// change color while the other colors stay the same.
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
//
// TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
// action in the IDE, or press "p" in the console), to see the
// wireframe for each widget.
mainAxisAlignment: .center,
children: [
const Text('You have pushed the button this many times:'),
Text(
'$_counter',
style: Theme.of(context).textTheme.headlineMedium,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
),
);
}
}
{{/withPluginHook}}
{{#withPlatformChannelPluginHook}}
class MyApp extends StatefulWidget {
const MyApp({super.key});

@override
State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
String _platformVersion = 'Unknown';
final _{{pluginClassLowerCamelCase}} = {{pluginDartClass}}();

@override
void initState() {
super.initState();
initPlatformState();
}

// Platform messages are asynchronous, so we initialize in an async method.
Future<void> initPlatformState() async {
String platformVersion;
// Platform messages may fail, so we use a try/catch PlatformException.
// We also handle the message potentially returning null.
try {
platformVersion =
await _{{pluginClassLowerCamelCase}}.getPlatformVersion() ?? 'Unknown platform version';
} on PlatformException {
platformVersion = 'Failed to get platform version.';
}

// If the widget was removed from the tree while the asynchronous platform
// message was in flight, we want to discard the reply rather than calling
// setState to update our non-existent appearance.
if (!mounted) return;

setState(() {
_platformVersion = platformVersion;
});
}

@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Plugin example app')),
body: Center(child: Text('Running on: $_platformVersion\n')),
),
);
}
}
{{/withPlatformChannelPluginHook}}
{{#withFfi}}
class MyApp extends StatefulWidget {
const MyApp({super.key});

@override
State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
late int sumResult;
late Future<int> sumAsyncResult;

@override
void initState() {
super.initState();
sumResult = {{pluginProjectName}}.sum(1, 2);
sumAsyncResult = {{pluginProjectName}}.sumAsync(3, 4);
}

@override
Widget build(BuildContext context) {
const textStyle = TextStyle(fontSize: 25);
const spacerSmall = SizedBox(height: 10);
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Native Packages')),
body: SingleChildScrollView(
child: Container(
padding: const .all(10),
child: Column(
children: [
const Text(
'This calls a native function through FFI that is shipped as source in the package. '
'The native code is built as part of the Flutter Runner build.',
style: textStyle,
textAlign: .center,
),
spacerSmall,
Text(
'sum(1, 2) = $sumResult',
style: textStyle,
textAlign: .center,
),
spacerSmall,
FutureBuilder<int>(
future: sumAsyncResult,
builder: (BuildContext context, AsyncSnapshot<int> value) {
final displayValue = (value.hasData)
? value.data
: 'loading';
return Text(
'await sumAsync(3, 4) = $displayValue',
style: textStyle,
textAlign: .center,
);
},
),
],
),
),
),
),
);
}
}
{{/withFfi}}
{{/withEmptyMain}}
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