flutter 调用摄像头，前后镜头切换

参考
直播开播前的镜头调试，单纯的显示摄像头的内容
添加插件

camera: ^0.9.7+1

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:camera/camera.dart';List<CameraDescription> cameras;Future<void> main() async {WidgetsFlutterBinding.ensureInitialized();cameras = await availableCameras();runApp(CameraApp());}class CameraApp extends StatefulWidget {@override_CameraAppState createState() => _CameraAppState();}class _CameraAppState extends State<CameraApp> {CameraController controller;@overridevoid initState() {super.initState();controller = CameraController(cameras[0], ResolutionPreset.medium);controller.initialize().then((_) {if (!mounted) {return;}setState(() {});});}@overridevoid dispose() {controller?.dispose();super.dispose();}@overrideWidget build(BuildContext context) {if (!controller.value.isInitialized) {return Container();}return AspectRatio(aspectRatio:controller.value.aspectRatio,child: CameraPreview(controller));}}

我自己的代码，直播开播前的镜头调试，单纯的显示摄像头的内容

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:camera/camera.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:permission_handler/permission_handler.dart';import '../../common/Global.dart';
import '../../common/backgroundWall.dart';
import '../../router.dart';//开播页
class StartCameraSeeding extends StatefulWidget {@overrideStartCameraSeedingState createState() => StartCameraSeedingState();
}class StartCameraSeedingState extends State<StartCameraSeeding> {CameraController? controller;late List<CameraDescription> cameras;//前后摄像头设置int frontCamera = 1;@overrideinitState() {//请求权限if (Platform.isAndroid || Platform.isIOS) {Permission.camera.request().then((value) async {print('权限的值是多少${value}');await Permission.microphone.request().then((value) {} );});}super.initState();//初始化镜头initData().then((value) {});}initData() async {cameras = await availableCameras();controller = CameraController(cameras[frontCamera], ResolutionPreset.medium);if (controller != null) {controller!.initialize().then((_) {if (!mounted) {return;}mySetState(() {});});}}@overridevoid dispose() {if (controller != null) {controller!.dispose();}super.dispose();}mySetState(callBack) {if (mounted) {setState(() {callBack();});}}@overrideWidget build(BuildContext context) {if (controller == null) {return Container();} else if (controller != null) {if (!controller!.value.isInitialized) {return Container();}}return Material(child: Stack(alignment: Alignment.center,children: [//  AspectRatio(//   aspectRatio: Global.screenWidth/Global.screenHeight,//   child: CameraPreview(controller!)),//除以反转，就是正常的比例了，用Transform.scale放大填充满屏Center(child: Transform.scale(scale: (1/controller!.value.aspectRatio)/deviceRatio,child: AspectRatio(aspectRatio: 1/controller!.value.aspectRatio,child: CameraPreview(controller!)),),),Column(children: [addHeadView(),Container(margin: const EdgeInsets.only(left: 20, right: 20, top: 50),decoration: const BoxDecoration(color: Colors.transparent),child: Row(crossAxisAlignment: CrossAxisAlignment.start,children: [BackgroundWall(width: 100,height: 100,hasPlaceholder: true,radius: 4.r,avatarUrl: 'assets/images/bg_none_nearby.png',fit: BoxFit.cover,),Container(margin: const EdgeInsets.only(top: 15),alignment: Alignment.topLeft,child: Column(children: const [Text('请输入直播标题',style: TextStyle(color: Colors.white, fontSize: 15),)],),)],),),Expanded(child: Container()),Row(children: [Expanded(child: GestureDetector(onTap: (){MyRouter.pushMyMap(context, MyRouter.directSeedingAnchor,{"type":1});},child: Container(margin: const EdgeInsets.only(left: 5, right: 5, bottom: 10),padding: const EdgeInsets.only(top: 10, bottom: 10),decoration: BoxDecoration(color: Colors.red, borderRadius: BorderRadius.circular(20)),child: Container(alignment: Alignment.center,child: const Text('开启视频直播',style: TextStyle(color: Colors.white, fontSize: 16),),),),),),GestureDetector(onTap: (){//前后镜头切换if(frontCamera==1){controller = CameraController(cameras[0], ResolutionPreset.medium);if (controller != null) {controller!.initialize().then((_) {if (!mounted) {return;}frontCamera=0;mySetState((){});});}}else{controller = CameraController(cameras[1], ResolutionPreset.medium);if (controller != null) {controller!.initialize().then((_) {if (!mounted) {return;}frontCamera=1;mySetState((){});});}}},child: Container(margin: const EdgeInsets.only(left: 5, right: 10, bottom: 10),padding: const EdgeInsets.only(top: 10, bottom: 10),child: const Image(image: AssetImage('assets/images/bg_none_nearby.png'),width: 35,height: 35,),),)],)],),],),);}Widget addHeadView() {return Container(padding: EdgeInsets.only(top: Global.topHeight + 11.r, bottom: 20.r),child: Row(children: [GestureDetector(onTap: () {Navigator.pop(context);},child: Container(margin: EdgeInsets.only(left: 15.r, right: 12.r),child: const Image(image: AssetImage('assets/images/icon_back@2x.png'),width: 24,height: 24,color: Colors.white,),),),]));}
}

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flutter 调用摄像头，前后镜头切换

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