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restructured the add to app samples (#698)
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gaaclarke
GitHub
136
add_to_app/plugin/flutter_module_using_plugin/lib/cell.dart
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136
add_to_app/plugin/flutter_module_using_plugin/lib/cell.dart
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// Copyright 2019 The Flutter team. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:math';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:sensors/sensors.dart';
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// This is on alternate entrypoint for this module to display Flutter UI in
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// a (multi-)view integration scenario.
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void main() {
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runApp(Cell());
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}
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class Cell extends StatefulWidget {
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@override
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State<StatefulWidget> createState() => new _CellState();
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}
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class _CellState extends State<Cell> with WidgetsBindingObserver {
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static const double gravity = 9.81;
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static final AccelerometerEvent defaultPosition = AccelerometerEvent(0, 0, 0);
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int cellNumber = 0;
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Random _random;
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AppLifecycleState appLifecycleState;
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@override
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void initState() {
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final channel = MethodChannel('dev.flutter.example/cell');
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channel.setMethodCallHandler((MethodCall call) async {
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if (call.method == 'setCellNumber') {
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setState(() {
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cellNumber = call.arguments as int;
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_random = Random(cellNumber);
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});
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}
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});
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// Keep track of what the current platform lifecycle state is.
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WidgetsBinding.instance.addObserver(this);
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super.initState();
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}
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@override
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void dispose() {
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WidgetsBinding.instance.removeObserver(this);
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super.dispose();
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}
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@override
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void didChangeAppLifecycleState(AppLifecycleState state) {
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setState(() {
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appLifecycleState = state;
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});
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}
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// Show a random bright color.
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Color randomLightColor() {
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_random ??= Random(cellNumber);
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return Color.fromARGB(255, _random.nextInt(50) + 205,
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_random.nextInt(50) + 205, _random.nextInt(50) + 205);
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}
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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// The Flutter cells will be noticeably different (due to background color
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// and the Flutter logo). The banner breaks immersion.
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debugShowCheckedModeBanner: false,
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home: Container(
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color: Colors.white,
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child: Builder(
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builder: (BuildContext context) {
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return Card(
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// Mimic the platform Material look.
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margin: EdgeInsets.symmetric(horizontal: 36, vertical: 24),
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(16),
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),
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elevation: 16,
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color: randomLightColor(),
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child: Stack(
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children: [
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Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Text(
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// Show a number provided by the platform based on
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// the cell's index.
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cellNumber.toString(),
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style: Theme.of(context).textTheme.headline3,
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),
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],
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),
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),
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Positioned(
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left: 42,
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top: 0,
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bottom: 0,
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child: Opacity(
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opacity: 0.2,
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child: StreamBuilder(
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// Don't continuously rebuild for nothing when the
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// cell isn't visible.
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stream: appLifecycleState == AppLifecycleState.resumed
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? accelerometerEvents
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: Stream.value(defaultPosition),
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initialData: defaultPosition,
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builder: (BuildContext context,
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AsyncSnapshot<AccelerometerEvent> snapshot) {
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return Transform(
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// Figure out the phone's orientation relative
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// to gravity's direction. Ignore the z vector.
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transform: Matrix4.rotationX(
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snapshot.data.y / gravity * pi / 2)
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..multiply(Matrix4.rotationY(
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snapshot.data.x / gravity * pi / 2)),
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alignment: Alignment.center,
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child: FlutterLogo(size: 72));
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},
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),
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),
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),
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],
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),
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);
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},
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),
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),
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);
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}
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}
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184
add_to_app/plugin/flutter_module_using_plugin/lib/main.dart
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184
add_to_app/plugin/flutter_module_using_plugin/lib/main.dart
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@@ -0,0 +1,184 @@
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// Copyright 2019 The Flutter team. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:provider/provider.dart';
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import 'package:url_launcher/url_launcher.dart' as launcher;
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import 'cell.dart';
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/// The entrypoint for the flutter module.
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void main() {
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// This call ensures the Flutter binding has been set up before creating the
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// MethodChannel-based model.
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WidgetsFlutterBinding.ensureInitialized();
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final model = CounterModel();
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runApp(
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ChangeNotifierProvider.value(
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value: model,
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child: MyApp(),
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),
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);
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}
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/// This is on alternate entrypoint for this module to display Flutter UI in
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/// a (multi-)view integration scenario.
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// This is unfortunately in this file due to
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// https://github.com/flutter/flutter/issues/72630.
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void showCell() {
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runApp(Cell());
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}
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/// A simple model that uses a [MethodChannel] as the source of truth for the
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/// state of a counter.
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///
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/// Rather than storing app state data within the Flutter module itself (where
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/// the native portions of the app can't access it), this module passes messages
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/// back to the containing app whenever it needs to increment or retrieve the
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/// value of the counter.
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class CounterModel extends ChangeNotifier {
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CounterModel() {
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_channel.setMethodCallHandler(_handleMessage);
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_channel.invokeMethod('requestCounter');
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}
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final _channel = MethodChannel('dev.flutter.example/counter');
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int _count = 0;
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int get count => _count;
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void increment() {
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_channel.invokeMethod('incrementCounter');
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}
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Future<dynamic> _handleMessage(MethodCall call) async {
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if (call.method == 'reportCounter') {
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_count = call.arguments as int;
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notifyListeners();
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}
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}
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}
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/// The "app" displayed by this module.
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///
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/// It offers two routes, one suitable for displaying as a full screen and
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/// another designed to be part of a larger UI.
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class MyApp extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Flutter Module Title',
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routes: {
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'/': (context) => FullScreenView(),
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'/mini': (context) => Contents(),
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},
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);
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}
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}
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/// Wraps [Contents] in a Material [Scaffold] so it looks correct when displayed
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/// full-screen.
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class FullScreenView extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Text('Full-screen Flutter with plugin'),
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),
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body: const Contents(showExit: true),
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);
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}
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}
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/// The actual content displayed by the module.
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///
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/// This widget displays info about the state of a counter and how much room (in
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/// logical pixels) it's been given. It also offers buttons to increment the
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/// counter, opening the Flutter documentation via the url_launcher plugin, and
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/// (optionally) close the Flutter view.
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class Contents extends StatelessWidget {
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final bool showExit;
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const Contents({this.showExit = false});
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@override
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Widget build(BuildContext context) {
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final mediaInfo = MediaQuery.of(context);
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return SizedBox.expand(
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child: Stack(
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children: [
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Positioned.fill(
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child: DecoratedBox(
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decoration: BoxDecoration(
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color: Theme.of(context).scaffoldBackgroundColor,
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),
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),
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),
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Positioned.fill(
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child: Opacity(
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opacity: .25,
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child: FittedBox(
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fit: BoxFit.cover,
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child: FlutterLogo(),
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),
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),
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),
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Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Text(
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'Window is ${mediaInfo.size.width.toStringAsFixed(1)} x '
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'${mediaInfo.size.height.toStringAsFixed(1)}',
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style: Theme.of(context).textTheme.headline5,
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),
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SizedBox(height: 16),
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Consumer<CounterModel>(
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builder: (context, model, child) {
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return Text(
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'Taps: ${model.count}',
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style: Theme.of(context).textTheme.headline5,
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);
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},
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),
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SizedBox(height: 16),
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Consumer<CounterModel>(
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builder: (context, model, child) {
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return ElevatedButton(
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onPressed: () => model.increment(),
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child: Text('Tap me!'),
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);
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},
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),
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ElevatedButton(
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onPressed: () async {
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// Use the url_launcher plugin to open the Flutter docs in
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// a browser.
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final url = 'https://flutter.dev/docs';
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if (await launcher.canLaunch(url)) {
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launcher.launch(url);
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}
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},
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child: Text('Open Flutter Docs'),
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),
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if (showExit) ...[
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SizedBox(height: 16),
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ElevatedButton(
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onPressed: () => SystemNavigator.pop(),
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child: Text('Exit this screen'),
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),
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],
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],
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),
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),
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],
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),
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);
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}
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}
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