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import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'dart:async';
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import 'dart:io';
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import 'package:camera/camera.dart';
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import 'package:flutter_screenutil/screen_util.dart';
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import 'package:fluttertoast/fluttertoast.dart';
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import 'package:image_picker/image_picker.dart';
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import 'package:path_provider/path_provider.dart';
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// import 'package:audioplayers/audio_cache.dart';
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import '../../components/commonFun.dart';
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import '../../components/dioFun.dart';
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class TakePictuer extends StatefulWidget {
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TakePictuer({this.arguments, Key key}) : super(key: key);
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var arguments;
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@override
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_TakePictuerState createState() {
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return _TakePictuerState();
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}
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}
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class _TakePictuerState extends State<TakePictuer> {
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final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
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String timestamp() => DateTime.now().millisecondsSinceEpoch.toString();
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Image image;
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String imagePath;
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CameraController _cameraController;
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@override
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void initState() {
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super.initState();
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//controller = CameraController(cameras[0], ResolutionPreset.medium); //后置相机
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_cameraController = CameraController(cameras[1], ResolutionPreset.medium); //前置相机
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_cameraController.initialize().then((_) {
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//初始化相机
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if (!mounted) {
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return;
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}
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_onCamera(); //开始拍照
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setState(() {});
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});
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}
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@override
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void dispose() {
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_cameraController?.dispose();
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super.dispose();
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}
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//开始拍照
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Future<void> _onCamera() async {
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await Future.delayed(Duration(milliseconds: 1000), () {
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print('开始拍照...');
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// AudioCache().play(File('audio/yinxiao1064.mp3').path); //播放咔嚓声
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myPlayClacks(); //播放咔嚓声
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onTakePictureButtonPressed();
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});
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}
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@override
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Widget build(BuildContext context) {
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if (!_cameraController.value.isInitialized) {
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return Container();
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}
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return Scaffold(
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key: _scaffoldKey,
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// appBar: AppBar(
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// automaticallyImplyLeading: false,
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// title: Container(
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// //获取 appBar 高度 kToolbarHeight，R:\Flutter\FlutterSDK\flutter\packages\flutter\lib\src\material\constants.dart
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// height: kToolbarHeight,
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// //width: ScreenUtil().screenWidth,
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// width: double.infinity,
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// child: Text('请拿起手机，眨眨眼 ...'),
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// decoration: BoxDecoration(
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// gradient: LinearGradient(
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// begin: Alignment.centerLeft,
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// end: Alignment.centerRight,
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// colors: [
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// Color.fromRGBO(12, 186, 156, 1),
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// Color.fromRGBO(39, 127, 235, 1),
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// ],
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// ),
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// ),
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// ),
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// ),
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body: Container(
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decoration: new BoxDecoration(
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//color: Colors.black,
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color: Colors.transparent,
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),
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child: Column(
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children: [
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SizedBox(height: ScreenUtil().statusBarHeight), //显示顶部状态栏
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Container(
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alignment: Alignment(0, 0),
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child: Text(
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'请拿起手机，眨眨眼 ...',
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style: TextStyle(fontSize: 18.0, color: Colors.white),
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textAlign: TextAlign.center,
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),
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height: ScreenUtil().setHeight(173),
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//越界
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//height: kToolbarHeight,
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//width: ScreenUtil().screenWidth,
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width: double.infinity,
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decoration: BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.centerLeft,
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end: Alignment.centerRight,
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colors: [
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Color.fromRGBO(12, 186, 156, 1),
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Color.fromRGBO(39, 127, 235, 1),
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],
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),
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),
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),
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Stack(
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children: <Widget>[
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Align(
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child: _cameraPreviewWidget(),
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),
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Align(
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child: _getImage(),
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),
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Positioned(
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left: ScreenUtil().screenWidth / 3,
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top: ScreenUtil().screenHeight / 4,
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child: image == null ? getMoreWidget() : _getSuccess(),
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),
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// Align(
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// alignment: Alignment.bottomCenter,
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// child: Center(
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// child: image == null ? getMoreWidget() : _getSuccess(),
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// ),
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// ),
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],
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),
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Expanded(child: Container(color: Colors.black))
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],
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),
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),
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);
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}
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//mounted 是 bool 类型，表示当前 State 是否加载到树⾥。
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// 常用于判断页面是否释放。比如在程序中有些异步的处理，当处理结束时直接调用setState方法会直接报错，
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// 因为页面已经释放（dispose）了，此时无法渲染页面，这时就可以使用mounted来进行判断页面是否被释放，如果释放了就不进行渲染。
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// if(mounted){
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// setState((){})
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// }
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void onTakePictureButtonPressed() async {
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image = null;
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takePicture().then((String filePath) async {
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if (mounted) {
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setState(() {
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imagePath = filePath;
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});
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if (filePath != null) {
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image = Image.file(File(filePath));
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print('Picture saved to $filePath');
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}
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await Future.delayed(Duration(milliseconds: 1000), () {
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if (filePath != null) {
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if ('FaceLogin' == widget.arguments) {
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//人脸验证，直接调用 uploadImage 进行验证登录
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faceLoginFun(filePath: filePath, context: context);
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} else if ('FaceReg' == widget.arguments) {
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//返回获得的人脸图片路径 filePath，等待管理员确认注册
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Navigator.pop(context, filePath);
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//人脸注册，username 用户名，filePath 人脸图片路径
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//faceRegFun(username: 'admin', filePath: filePath);
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}
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}
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});
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}
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});
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}
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Future<String> takePicture() async {
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if (!_cameraController.value.isInitialized) {
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print('Error: select a camera first.');
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return null;
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}
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final Directory extDir = await getApplicationDocumentsDirectory();
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final String dirPath = '${extDir.path}/Pictures/flutter_test';
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await Directory(dirPath).create(recursive: true);
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final String filePath = '$dirPath/${timestamp()}.jpg';
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if (_cameraController.value.isTakingPicture) {
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// A capture is already pending, do nothing.
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return null;
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}
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try {
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await _cameraController.takePicture(filePath);
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} on CameraException catch (e) {
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print('e = ${e.toString()}');
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return null;
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}
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return filePath;
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}
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//拍照成功
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Widget _getSuccess({String text = '拍照成功！'}) {
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if (image == null || _cameraController == null || !_cameraController.value.isInitialized) {
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return Container(); //不能放回null，否则Stack会报错
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} else {
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return Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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crossAxisAlignment: CrossAxisAlignment.center,
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children: <Widget>[
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Icon(
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Icons.check,
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size: 60,
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color: Colors.white,
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),
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SizedBox(
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height: 10,
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),
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Text(
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text,
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style: TextStyle(
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fontSize: 30.0, // 文字大小
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color: Colors.white, // 文字颜色
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),
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),
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],
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),
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);
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}
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}
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//加载照片
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Widget _getImage() {
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if (image == null || _cameraController == null || !_cameraController.value.isInitialized) {
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return Container(); //不能放回null，否则Stack会报错
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} else {
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return Center(
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child: AspectRatio(
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aspectRatio: _cameraController.value.aspectRatio,
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child: image,
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),
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);
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}
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}
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Widget _cameraPreviewWidget() {
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if (_cameraController == null || !_cameraController.value.isInitialized) {
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return const Text(
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'正在启动相机...',
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style: TextStyle(
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color: Colors.white,
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fontSize: 24.0,
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fontWeight: FontWeight.w900,
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),
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);
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} else {
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return AspectRatio(
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aspectRatio: _cameraController.value.aspectRatio,
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child: CameraPreview(_cameraController),
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);
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}
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}
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}
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