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「.NET 開発基盤部会 Wiki」は、「Open棟梁Project」,「OSSコンソーシアム .NET開発基盤部会」によって運営されています。
Flutter の step by step（其の二）。
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
...
class _MyHomePageState extends State<MyHomePage> {
static const platform = const MethodChannel('samples.flutter.dev/battery');
// Get battery level.
String _batteryLevel = 'Unknown battery level.';
Future<void> _getBatteryLevel() async {
String batteryLevel;
try {
final int result = await platform.invokeMethod('getBatteryLevel');
batteryLevel = 'Battery level at $result % .';
} on PlatformException catch (e) {
batteryLevel = "Failed to get battery level: '${e.message}'.";
}
setState(() {
_batteryLevel = batteryLevel;
});
}
Widget build(BuildContext context) {
...
ElevatedButton(
child: const Text('BatteryLevel Button'),
style: ElevatedButton.styleFrom(
primary: Colors.orange,
onPrimary: Colors.white,
),
onPressed: _getBatteryLevel,
)
...
}
package com.opentouryo.flutter_template
import androidx.annotation.NonNull
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.MethodChannel
import android.content.Context
import android.content.ContextWrapper
import android.content.Intent
import android.content.IntentFilter
import android.os.BatteryManager
import android.os.Build.VERSION
import android.os.Build.VERSION_CODES
class MainActivity: FlutterActivity() {
private val CHANNEL = "samples.flutter.dev/battery"
override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
super.configureFlutterEngine(flutterEngine)
MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler {
call, result ->
// Note: this method is invoked on the main thread.
// TODO
if (call.method == "getBatteryLevel") {
val batteryLevel = getBatteryLevel()
if (batteryLevel != -1) {
result.success(batteryLevel)
} else {
result.error("UNAVAILABLE", "Battery level not available.", null)
}
} else {
result.notImplemented()
}
}
}
private fun getBatteryLevel(): Int {
val batteryLevel: Int
if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
val batteryManager = getSystemService(Context.BATTERY_SERVICE) as BatteryManager
batteryLevel = batteryManager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY)
} else {
val intent = ContextWrapper(applicationContext).registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
batteryLevel = intent!!.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) * 100 / intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1)
}
return batteryLevel
}
}
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
let batteryChannel = FlutterMethodChannel(name: "samples.flutter.dev/battery",
binaryMessenger: controller.binaryMessenger)
batteryChannel.setMethodCallHandler({
(call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
// Note: this method is invoked on the UI thread.
// Handle battery messages.
guard call.method == "getBatteryLevel" else {
result(FlutterMethodNotImplemented)
return
}
self?.receiveBatteryLevel(result: result)
})
GeneratedPluginRegistrant.register(with: self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
}
private func receiveBatteryLevel(result: FlutterResult) {
let device = UIDevice.current
device.isBatteryMonitoringEnabled = true
if device.batteryState == UIDevice.BatteryState.unknown {
result(FlutterError(code: "UNAVAILABLE",
message: "Battery info unavailable",
details: nil))
} else {
result(Int(device.batteryLevel * 100))
}
}
<!-- Deep Links --> <intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:scheme="myapp" android:host="hoge" /> </intent-filter>
<!-- App Links --> <intent-filter android:autoVerify="true"> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:scheme="http" android:host="example.com" /> </intent-filter>
ロケーション・バー直では、動かないとのこと。
以下のHTMLを作成し、ソコから飛んでみる。
<!DOCTYPE html>
<html>
<body>
<a href="myapp://hoge/">App Aに飛ぶ</a>
</body>
</html><!DOCTYPE html>
<html>
<body>
<a href="http://example.com/">App Aに飛ぶ</a>
</body>
</html>サンプルコードが、Null Safetyだったため。
>flutter channel Flutter channels: master dev beta * stable
>flutter upgrade Flutter is already up to date on channel stable Flutter 2.2.1 • channel stable • https://github.com/flutter/flutter.git Framework • revision 02c026b03c (2 days ago) • 2021-05-27 12:24:44 -0700 Engine • revision 0fdb562ac8 Tools • Dart 2.13.1
>flutter doctor
Waiting for another flutter command to release the startup lock...
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 2.2.1, on Microsoft Windows [Version 10.0.19041.985], locale ja-JP)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
X Android license status unknown.
Run `flutter doctor --android-licenses` to accept the SDK licenses.
See https://flutter.dev/docs/get-started/install/windows#android-setup for more details.
[√] Chrome - develop for the web
[√] Android Studio (version 4.1.0)
[√] VS Code, 64-bit edition (version 1.47.2)
[√] Connected device (3 available)
! Doctor found issues in 1 category.
>flutter doctor --android-licenses All SDK package licenses accepted.======] 100% Computing updates...
>flutter doctor Doctor summary (to see all details, run flutter doctor -v): [√] Flutter (Channel stable, 2.2.1, on Microsoft Windows [Version 10.0.19041.985], locale ja-JP) [√] Android toolchain - develop for Android devices (Android SDK version 30.0.3) [√] Chrome - develop for the web [√] Android Studio (version 4.1.0) [√] VS Code, 64-bit edition (version 1.47.2) [√] Connected device (3 available) • No issues found!
environment: sdk: ">=2.12.0-0 <3.0.0"
（flutter pub getの代替）
dart migrate
Android SDK Command-line Tools(latest)にチェック
'io.identityserver.demo:/oauthredirect'
...と、Private-Use URI Scheme Redirectionになってるので、
...
android {
...
defaultConfig {
...
manifestPlaceholders = [
'appAuthRedirectScheme': 'io.identityserver.demo'
]
}
}<manifest>
<queries>
<intent>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="https" />
</intent>
<intent>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.APP_BROWSER" />
<data android:scheme="https" />
</intent>
</queries><key>CFBundleURLTypes</key>
<array>
<dict>
<key>CFBundleTypeRole</key>
<string>Editor</string>
<key>CFBundleURLSchemes</key>
<array>
<string>io.identityserver.demo</string>
</array>
</dict>
</array>と指定する必要がある。
