在Flutter中保存照片(尤其是到相机胶卷) [英] Saving photo in Flutter (esp. to camera roll)
问题描述
我不知道如何保存到相机胶卷(相当于React Native的 CameraRoll
I can't figure out how to save to the camera roll (the equivalent of React Native's CameraRoll
saveToCameraRoll()
.
-
抖动照相机建议使用
Flutter camera recommends using
path_provider
to get application directories, but it doesn't seem to have an option to get the camera roll directory path.
我在 CameraController.capture
相关更改(以及仅以diff形式的相关更改)在此处: https://gist.github.com/briankung/45f9d8438baab59ddcd3b6f3fe811d99
The relevant changes (and only the relevant changes, in the form of a diff) are here: https://gist.github.com/briankung/45f9d8438baab59ddcd3b6f3fe811d99
下面是我的整个 main.dart
,以便于进行复制(搜索 QUESTION:
以查找相关部分):
My whole main.dart
is below for easy repro (search QUESTION:
to find the relevant portions):
import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:camera/camera.dart';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';
List<CameraDescription> cameras;
Future<Null> main() async {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown
]);
cameras = await availableCameras();
runApp(new CameraApp());
}
class CameraApp extends StatefulWidget {
@override
_CameraAppState createState() => new _CameraAppState();
}
class _CameraAppState extends State<CameraApp> {
String _appDirectoryPath;
CameraController controller;
Future<void> _requestAppDirectory() async {
// QUESTION: `path_provider` doesn't have getCameraRollDirectory()
Directory _appDirectory = await getApplicationDocumentsDirectory();
setState(() {
_appDirectoryPath = _appDirectory.path;
});
}
@override
void initState() {
super.initState();
_requestAppDirectory();
controller = new CameraController(cameras[0], ResolutionPreset.medium);
controller.initialize().then((_) {
if (!mounted) {
return;
}
setState(() {});
});
}
@override
void dispose() {
controller?.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
if (!controller.value.initialized) {
return new Container();
}
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.red,
),
home: new Scaffold(
body: new Center(
child: new AspectRatio(
aspectRatio: controller.value.aspectRatio,
child: new CameraPreview(controller),
),
),
floatingActionButton: new FloatingActionButton(
tooltip: 'Increment',
child: new Icon(Icons.camera),
onPressed: () {
print('capturing');
print(_appDirectoryPath);
// QUESTION: this errors out
controller.capture(_appDirectoryPath);
},
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
),
);
}
}
日志信息如下:
I/flutter ( 5471): capturing
I/flutter ( 5471): /data/user/0/com.example.mycameraapp/app_flutter
W/LegacyRequestMapper( 5471): convertRequestMetadata - control.awbRegions setting is not supported, ignoring value
W/LegacyRequestMapper( 5471): Only received metering rectangles with weight 0.
W/LegacyRequestMapper( 5471): Only received metering rectangles with weight 0.
I/RequestThread-0( 5471): Received jpeg.
I/RequestThread-0( 5471): Producing jpeg buffer...
W/LegacyRequestMapper( 5471): convertRequestMetadata - control.awbRegions setting is not supported, ignoring value
W/LegacyRequestMapper( 5471): Only received metering rectangles with weight 0.
W/LegacyRequestMapper( 5471): Only received metering rectangles with weight 0.
E/flutter ( 5471): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter ( 5471): CameraException(IOError, Failed saving image)
E/flutter ( 5471): #0 CameraController.capture (package:camera/camera.dart:234:7)
E/flutter ( 5471): <asynchronous suspension>
E/flutter ( 5471): #1 _CameraAppState.build.<anonymous closure> (file:///Users/briankung/workspace/mobile/flutter/my_camera_app/lib/main.dart:84:24)
E/flutter ( 5471): #2 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:478:14)
E/flutter ( 5471): #3 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:530:30)
E/flutter ( 5471): #4 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter ( 5471): #5 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9)
E/flutter ( 5471): #6 TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:123:7)
E/flutter ( 5471): #7 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter ( 5471): #8 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:147:20)
E/flutter ( 5471): #9 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
E/flutter ( 5471): #10 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
E/flutter ( 5471): #11 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
E/flutter ( 5471): #12 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
E/flutter ( 5471): #13 _invoke1 (dart:ui/hooks.dart:134:13)
E/flutter ( 5471): #14 _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5)
I/RequestQueue( 5471): Repeating capture request cancelled.
谢谢!
忘记版本号:
$ flutter --version
Flutter 0.2.8 • channel beta • https://github.com/flutter/flutter.git
Framework • revision b397406561 (10 days ago) • 2018-04-02 13:53:20 -0700
Engine • revision c903c217a1
Tools • Dart 2.0.0-dev.43.0.flutter-52afcba357
// pubspec.yaml
camera:
dependency: "direct main"
description:
name: camera
url: "https://pub.dartlang.org"
source: hosted
version: "0.1.2"
path_provider:
dependency: "direct main"
description:
name: path_provider
url: "https://pub.dartlang.org"
source: hosted
version: "0.4.0"
推荐答案
You can use gallery_saver from pub.dev/packages/gallery_saver which saves both video and images in gallery/photos both for Android & iOS.
您只需要为它提供文件或url的临时路径,它既可以保存本地文件,也可以保存来自网络的文件.
You just need to provide it with a temporary path to a file or url, it saves both local files and those from network.
这是它的用法:
GallerySaver.saveVideo(String path);
GallerySaver.saveImage(String path);
在成功保存案例文件后,两个函数都返回true,而以其他任何方式返回false.
Both functions return true in a case file was successfully saved, and false in any other way.
我的团队开发了此插件.
My team developed this plugin.
这篇关于在Flutter中保存照片(尤其是到相机胶卷)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!