Get Device Orientation including upside down - by Simon Lightfoot - Humpday Q&A :: 27th December 2023 #Flutter #Dart

humpday_271223.dart

// MIT License
//
// Copyright (c) 2023 Simon Lightfoot
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:jni/jni.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setPreferredOrientations(DeviceOrientation.values);
  runApp(const MaterialApp(home: Home()));
}

class Home extends StatefulWidget {
  const Home({super.key});

  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {
  final rotationManager = RotationManager();
  late DeviceOrientation deviceOrientation;

  @override
  void dispose() {
    rotationManager.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final orientation = MediaQuery.orientationOf(context);
    deviceOrientation = rotationManager.getDeviceOrientation();
    return Material(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Text(
            '$deviceOrientation\n\n$orientation',
            style: const TextStyle(fontSize: 20.0),
            textAlign: TextAlign.center,
          ),
        ],
      ),
    );
  }
}

class RotationManager {
  RotationManager() {
    JObject.fromRef(Jni.getCurrentActivity()) //
        .use((activity) {
      _display = activity.callMethodByName<JObject>(
        'getDisplay',
        '()Landroid/view/Display;',
        [],
      );
    });
  }

  late final JObject _display;

  DeviceOrientation getDeviceOrientation() {
    final rotation = _display.callMethodByName<int>(
        'getRotation', '()I', [], JniCallType.intType);
    return switch (rotation) {
      0 => DeviceOrientation.portraitUp, // Surface.ROTATION_0
      1 => DeviceOrientation.landscapeLeft, // Surface.ROTATION_90
      2 => DeviceOrientation.portraitDown, // Surface.ROTATION_180
      3 => DeviceOrientation.landscapeRight, // Surface.ROTATION_270
      _ => throw 'Bad rotation value: $rotation',
    };
  }

  void dispose() {
    _display.release();
  }
}