harmony_flutter 实现修改屏幕亮度
ohos 端建立通
import settings from '@ohos.settings';import window from '@ohos.window';import FlutterManager from '@ohos/flutter_ohos/src/main/ets/embedding/ohos/FlutterManager';import { AbilityPluginBinding, FlutterPlugin, FlutterPluginBinding } from '@ohos/flutter_ohos/index';import MethodChannel, { MethodCallHandler, MethodResult} from '@ohos/flutter_ohos/src/main/ets/plugin/common/MethodChannel';import MethodCall from '@ohos/flutter_ohos/src/main/ets/plugin/common/MethodCall';import Log from '@ohos/flutter_ohos/src/main/ets/util/Log';
const TAG = "FlutterScreenPlugin"
export class FlutterScreenPlugin implements FlutterPlugin, MethodCallHandler { private channelName: string = "github.com/clovisnicolas/flutter_screen" private abilityPluginBinding: AbilityPluginBinding | null = null; private channel: MethodChannel | null = null private mainWindow: window.Window | null = null;
getUniqueClassName(): string { return TAG; }
onAttachedToEngine(binding: FlutterPluginBinding): void { this.channel = new MethodChannel(binding.getBinaryMessenger(), this.channelName) this.channel?.setMethodCallHandler(this) }
onDetachedFromEngine(binding: FlutterPluginBinding): void { this.channel?.setMethodCallHandler(null) this.channel = null }
onAttachedToAbility(binding: AbilityPluginBinding): void { this.abilityPluginBinding = binding; }
onDetachedFromAbility(): void { this.abilityPluginBinding = null; this.mainWindow = null }
getWindow(): void { this.mainWindow = FlutterManager.getInstance() .getWindowStage(FlutterManager.getInstance().getUIAbility(this.abilityPluginBinding?.getAbility().context)) .getMainWindowSync(); }
onMethodCall(call: MethodCall, result: MethodResult): void { try { if (!this.mainWindow) { this.getWindow(); } switch (call.method) { case "brightness": result.success(this.getBrightness()); break; case "setBrightness": this.mainWindow?.setWindowBrightness(parseFloat(call.argument("brightness"))); result.success(null); break; case "isKeptOn": let flags: boolean = this.mainWindow?.getWindowProperties().isKeepScreenOn || false result.success(flags); break; case "keepOn": let on: boolean = call.argument("on"); if (on) { Log.i(TAG, "Keeping screen on "); this.mainWindow?.setWindowKeepScreenOn(true); } else { Log.i(TAG, "Not keeping screen on"); this.mainWindow?.setWindowKeepScreenOn(false); } result.success(null); break;
default: result.notImplemented(); break; } } catch (e) { Log.e(TAG, "set screen brightness failed"); } }
getBrightness(): number { const brightness = this.mainWindow?.getWindowProperties().brightness; if (brightness && brightness >= 0) { return brightness } // 首次未获取到窗口亮度时返回系统设置的亮度 let result: number; try { // the application is using the system brightness let value = settings.getValueSync( this.abilityPluginBinding?.getAbility().context, settings.display.SCREEN_BRIGHTNESS_STATUS, '100', settings.domainName.DEVICE_SHARED ) result = parseFloat(value) / 255; } catch (err) { result = 1.0; Log.e(TAG, "get screen brightness failed"); } return result; }}
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flutter 端代码
import 'dart:async';
import 'package:flutter/services.dart';
class Screen { static const MethodChannel _channel = const MethodChannel('github.com/clovisnicolas/flutter_screen');
static Future<double> get brightness async => (await _channel.invokeMethod('brightness')) as double; static Future setBrightness(double brightness) =>_channel.invokeMethod('setBrightness',{"brightness" : brightness}); static Future<bool> get isKeptOn async => (await _channel.invokeMethod('isKeptOn')) as bool; static Future keepOn(bool on) => _channel.invokeMethod('keepOn', {"on" : on});}
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class _MyAppState extends State<MyApp> { bool _isKeptOn = false; double _brightness = 1.0;
@override initState() { super.initState(); initPlatformState(); }
initPlatformState() async { bool keptOn = await Screen.isKeptOn; double brightness = await Screen.brightness; setState((){ _isKeptOn = keptOn; _brightness = brightness; }); }
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@override
Widget build(BuildContext context) {
return new MaterialApp(
home: new Scaffold(
appBar: new AppBar(title: new Text('Screen plugin example')),
body: new Center(
child: new Column(
children: <Widget>[
new Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Text("Screen is kept on ? "),
new Checkbox(value: _isKeptOn, onChanged: (bool b){
Screen.keepOn(b);
setState((){_isKeptOn = b; });
})
]
),
new Text("Brightness :"),
new Slider(value : _brightness, onChanged : (double b){
setState((){_brightness = b;});
Screen.setBrightness(b);
})
]
)
),
),
);
}
}
flutter example 引用
import 'package:flutter/material.dart';import 'package:screen/screen.dart';
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