Flutter笔记：使用相机

import 'package:flutter/material.dart';
import 'package:camera/camera.dart';
 
class CameraApp extends StatefulWidget {
  @override
  _CameraAppState createState() => _CameraAppState();
}
 
class _CameraAppState extends State<CameraApp> {
  CameraController _controller;
  CameraLensDirection _direction = CameraLensDirection.back;
 
  @override
  void initState() {
    super.initState();
    _initCameraController();
  }
 
  void _initCameraController() async {
    final cameras = await availableCameras();
    final firstCamera = cameras.firstWhere(
      (camera) => camera.lensDirection == _direction,
    );
    _controller = CameraController(
      firstCamera,
      ResolutionPreset.medium,
    );
    await _controller.initialize();
    if (mounted) {
      setState(() {});
    }
  }
 
  @override
  void dispose() {
    _controller?.dispose();
    super.dispose();
  }
 
  @override
  Widget build(BuildContext context) {
    if (!_controller.value.isInitialized) {
      return Container();
    }
    return AspectRatio(
      aspectRatio: _controller.value.aspectRatio,
      child: CameraPreview(_controller),
    );
  }
}

这段代码展示了如何在Flutter中使用camera插件来初始化一个相机并显示预览。它首先检查并初始化了相机，然后在界面上展示了相机预览。这是学习如何在Flutter应用中集成相机功能的一个很好的起点。