Flutter增强现实功能插件ar_flutter_plugin的使用

简介

ar_flutter_plugin 是一个用于在 Flutter 应用中实现增强现实（AR）功能的插件。它支持 iOS 上的 ARKit 和 Android 上的 ARCore。该插件提供了丰富的功能，包括放置 3D 对象、手势操作、云锚点等。

安装

你可以通过以下命令将 ar_flutter_plugin 添加到你的 Flutter 项目中：

flutter pub add ar_flutter_plugin

或者手动在 pubspec.yaml 文件中添加依赖，并运行 flutter pub get：

dependencies:
  ar_flutter_plugin: ^0.7.3

导入

在你的 Dart 代码中添加以下导入语句：

import 'package:ar_flutter_plugin/ar_flutter_plugin.dart';

iOS 权限配置

如果你在 iOS 上遇到权限问题（例如，即使允许了相机访问，相机视图仍不显示），请在 ios 目录下的 podfile 中添加以下配置：

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
    target.build_configurations.each do |config|
      # Additional configuration options could already be set here

      # BEGINNING OF WHAT YOU SHOULD ADD
      config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
        '$(inherited)',

        ## dart: PermissionGroup.camera
        'PERMISSION_CAMERA=1',

        ## dart: PermissionGroup.photos
        'PERMISSION_PHOTOS=1',

        ## dart: [PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse]
        'PERMISSION_LOCATION=1',

        ## dart: PermissionGroup.sensors
        'PERMISSION_SENSORS=1',

        ## dart: PermissionGroup.bluetooth
        'PERMISSION_BLUETOOTH=1',

        # add additional permission groups if required
      ]
      # END OF WHAT YOU SHOULD ADD
    end
  end
end

示例应用

为了更好地了解如何使用 ar_flutter_plugin，可以参考以下示例应用：

示例列表

示例代码

以下是一个简单的示例代码，展示了如何使用 ar_flutter_plugin 创建一个包含多个 AR 示例的应用：

import 'package:ar_flutter_plugin_example/examples/externalmodelmanagementexample.dart';
import 'package:ar_flutter_plugin_example/examples/objectsonplanesexample.dart';
import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:ar_flutter_plugin/ar_flutter_plugin.dart';

import 'package:ar_flutter_plugin_example/examples/cloudanchorexample.dart';
import 'package:ar_flutter_plugin_example/examples/localandwebobjectsexample.dart';
import 'package:ar_flutter_plugin_example/examples/debugoptionsexample.dart';

import 'examples/objectgesturesexample.dart';
import 'examples/screenshotexample.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  static const String _title = 'AR Plugin Demo';

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

  // 平台消息是异步的，因此我们在异步方法中初始化
  Future<void> initPlatformState() async {
    String platformVersion;
    // 平台消息可能会失败，所以我们使用 try/catch PlatformException
    try {
      platformVersion = await ArFlutterPlugin.platformVersion;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // 如果小部件在异步平台消息处理期间被从树中移除，我们希望丢弃回复而不是调用 setState 更新不存在的界面
    if (!mounted) return;

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text(_title),
        ),
        body: Column(children: [
          Text('Running on: $_platformVersion\n'),
          Expanded(
            child: ExampleList(),
          ),
        ]),
      ),
    );
  }
}

class ExampleList extends StatelessWidget {
  ExampleList({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final examples = [
      Example(
          'Debug Options',
          'Visualize feature points, planes and world coordinate system',
          () => Navigator.push(context,
              MaterialPageRoute(builder: (context) => DebugOptionsWidget()))),
      Example(
          'Local & Online Objects',
          'Place 3D objects from Flutter assets and the web into the scene',
          () => Navigator.push(
              context,
              MaterialPageRoute(
                  builder: (context) => LocalAndWebObjectsWidget()))),
      Example(
          'Anchors & Objects on Planes',
          'Place 3D objects on detected planes using anchors',
          () => Navigator.push(
              context,
              MaterialPageRoute(
                  builder: (context) => ObjectsOnPlanesWidget()))),
      Example(
          'Object Transformation Gestures',
          'Rotate and Pan Objects',
          () => Navigator.push(context,
              MaterialPageRoute(builder: (context) => ObjectGesturesWidget()))),
      Example(
          'Screenshots',
          'Place 3D objects on planes and take screenshots',
          () => Navigator.push(context,
              MaterialPageRoute(builder: (context) => ScreenshotWidget()))),
      Example(
          'Cloud Anchors',
          'Place and retrieve 3D objects using the Google Cloud Anchor API',
          () => Navigator.push(context,
              MaterialPageRoute(builder: (context) => CloudAnchorWidget()))),
      Example(
          'External Model Management',
          'Similar to Cloud Anchors example, but uses external database to choose from available 3D models',
          () => Navigator.push(
              context,
              MaterialPageRoute(
                  builder: (context) => ExternalModelManagementWidget())))
    ];
    return ListView(
      children: examples.map((example) => ExampleCard(example: example)).toList(),
    );
  }
}

class ExampleCard extends StatelessWidget {
  ExampleCard({Key? key, required this.example}) : super(key: key);
  final Example example;

  @override
  build(BuildContext context) {
    return Card(
      child: InkWell(
        splashColor: Colors.blue.withAlpha(30),
        onTap: () {
          example.onTap();
        },
        child: ListTile(
          title: Text(example.name),
          subtitle: Text(example.description),
        ),
      ),
    );
  }
}

class Example {
  const Example(this.name, this.description, this.onTap);
  final String name;
  final String description;
  final Function onTap;
}

贡献

欢迎为 ar_flutter_plugin 贡献代码和讨论想法。你可以通过以下方式参与：

• 创建 Pull Request
• 打开 Issue
• 开始讨论

插件架构

以下是插件架构的简要概述：

希望这些信息能帮助你更好地理解和使用 ar_flutter_plugin！如果有任何问题或需要进一步的帮助，请随时提问。