项目报错 #36
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你的sdk环境 |
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我也是这个问题 ，我觉得我项目环境没问题 |
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@rongchen2017 好的。我看看 |
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@pangliming @rongcheng2017 贴一个flutter doctor出来呀 |
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@rongcheng2017 你的dart版本是多少,我的是 |
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@kaina404 麻烦您了 |
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@rongcheng2017 library cached_network_image;
import 'dart:async';
import 'dart:io';
import 'dart:typed_data';
import 'dart:ui' as ui show instantiateImageCodec, Codec;
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_cache_manager/flutter_cache_manager.dart';
/// CachedNetworkImage for Flutter
///
/// Copyright (c) 2017 Rene Floor
///
/// Released under MIT License.
///缓存网络图片
class CachedNetworkImage extends StatefulWidget {
static List<Object> _registeredErrors = <Object>[];
/// Creates a widget that displays a [placeholder] while an [imageUrl] is loading
/// then cross-fades to display the [imageUrl].
/// Optional [httpHeaders] can be used for example for authentication on the server.
///
/// The [imageUrl], [fadeOutDuration], [fadeOutCurve],
/// [fadeInDuration], [fadeInCurve], [alignment], [repeat], and
/// [matchTextDirection] arguments must not be null. Arguments [width],
/// [height], [fit], [alignment], [repeat] and [matchTextDirection]
/// are only used for the image and not for the placeholder.
const CachedNetworkImage({
Key key,
this.placeholder,
@required this.imageUrl,
this.errorWidget,
this.fadeOutDuration: const Duration(milliseconds: 300),
this.fadeOutCurve: Curves.easeOut,
this.fadeInDuration: const Duration(milliseconds: 700),
this.fadeInCurve: Curves.easeIn,
this.width,
this.height,
this.fit,
this.alignment: Alignment.center,
this.repeat: ImageRepeat.noRepeat,
this.matchTextDirection: false,
this.httpHeaders,
}) : assert(imageUrl != null),
assert(fadeOutDuration != null),
assert(fadeOutCurve != null),
assert(fadeInDuration != null),
assert(fadeInCurve != null),
assert(alignment != null),
assert(repeat != null),
assert(matchTextDirection != null),
super(key: key);
/// Widget displayed while the target [imageUrl] is loading.
final Widget placeholder;
/// The target image that is displayed.
final String imageUrl;
/// Widget displayed while the target [imageUrl] failed loading.
final Widget errorWidget;
/// The duration of the fade-out animation for the [placeholder].
final Duration fadeOutDuration;
/// The curve of the fade-out animation for the [placeholder].
final Curve fadeOutCurve;
/// The duration of the fade-in animation for the [imageUrl].
final Duration fadeInDuration;
/// The curve of the fade-in animation for the [imageUrl].
final Curve fadeInCurve;
/// If non-null, require the image to have this width.
///
/// If null, the image will pick a size that best preserves its intrinsic
/// aspect ratio. This may result in a sudden change if the size of the
/// placeholder widget does not match that of the target image. The size is
/// also affected by the scale factor.
final double width;
/// If non-null, require the image to have this height.
///
/// If null, the image will pick a size that best preserves its intrinsic
/// aspect ratio. This may result in a sudden change if the size of the
/// placeholder widget does not match that of the target image. The size is
/// also affected by the scale factor.
final double height;
/// How to inscribe the image into the space allocated during layout.
///
/// The default varies based on the other fields. See the discussion at
/// [paintImage].
final BoxFit fit;
/// How to align the image within its bounds.
///
/// The alignment aligns the given position in the image to the given position
/// in the layout bounds. For example, a [Alignment] alignment of (-1.0,
/// -1.0) aligns the image to the top-left corner of its layout bounds, while a
/// [Alignment] alignment of (1.0, 1.0) aligns the bottom right of the
/// image with the bottom right corner of its layout bounds. Similarly, an
/// alignment of (0.0, 1.0) aligns the bottom middle of the image with the
/// middle of the bottom edge of its layout bounds.
///
/// If the [alignment] is [TextDirection]-dependent (i.e. if it is a
/// [AlignmentDirectional]), then an ambient [Directionality] widget
/// must be in scope.
///
/// Defaults to [Alignment.center].
///
/// See also:
///
/// * [Alignment], a class with convenient constants typically used to
/// specify an [AlignmentGeometry].
/// * [AlignmentDirectional], like [Alignment] for specifying alignments
/// relative to text direction.
final AlignmentGeometry alignment;
/// How to paint any portions of the layout bounds not covered by the image.
final ImageRepeat repeat;
/// Whether to paint the image in the direction of the [TextDirection].
///
/// If this is true, then in [TextDirection.ltr] contexts, the image will be
/// drawn with its origin in the top left (the "normal" painting direction for
/// images); and in [TextDirection.rtl] contexts, the image will be drawn with
/// a scaling factor of -1 in the horizontal direction so that the origin is
/// in the top right.
///
/// This is occasionally used with images in right-to-left environments, for
/// images that were designed for left-to-right locales. Be careful, when
/// using this, to not flip images with integral shadows, text, or other
/// effects that will look incorrect when flipped.
///
/// If this is true, there must be an ambient [Directionality] widget in
/// scope.
final bool matchTextDirection;
// Optional headers for the http request of the image url
final Map<String, String> httpHeaders;
@override
State<StatefulWidget> createState() => new _CachedNetworkImageState();
}
/// The phases a [CachedNetworkImage] goes through.
@visibleForTesting
enum ImagePhase {
/// The initial state.
///
/// We do not yet know whether the target image is ready and therefore no
/// animation is necessary, or whether we need to use the placeholder and
/// wait for the image to load.
start,
/// Waiting for the target image to load.
waiting,
/// Fading out previous image.
fadeOut,
/// Fading in new image.
fadeIn,
/// Fade-in complete.
completed,
}
typedef void _ImageProviderResolverListener();
class _ImageProviderResolver {
_ImageProviderResolver({
@required this.state,
@required this.listener,
});
final _CachedNetworkImageState state;
final _ImageProviderResolverListener listener;
CachedNetworkImage get widget => state.widget;
ImageStream _imageStream;
ImageInfo _imageInfo;
void resolve(CachedNetworkImageProvider provider) {
final ImageStream oldImageStream = _imageStream;
_imageStream = provider.resolve(createLocalImageConfiguration(state.context,
size: widget.width != null && widget.height != null
? new Size(widget.width, widget.height)
: null));
if (_imageStream.key != oldImageStream?.key) {
oldImageStream?.removeListener(_handleImageChanged);
_imageStream.addListener(_handleImageChanged);
}
}
get _handleImageChanged => _handleImageChanged2;
void _handleImageChanged2(ImageInfo imageInfo, bool synchronousCall) {
_imageInfo = imageInfo;
listener();
}
void stopListening() {
_imageStream?.removeListener(_handleImageChanged);
}
}
class _CachedNetworkImageState extends State<CachedNetworkImage>
with TickerProviderStateMixin {
_ImageProviderResolver _imageResolver;
CachedNetworkImageProvider _imageProvider;
AnimationController _controller;
Animation<double> _animation;
ImagePhase _phase = ImagePhase.start;
ImagePhase get phase => _phase;
bool _hasError;
@override
void initState() {
_hasError = false;
_imageProvider = new CachedNetworkImageProvider(widget.imageUrl,
headers: widget.httpHeaders, errorListener: _imageLoadingFailed);
_imageResolver =
new _ImageProviderResolver(state: this, listener: _updatePhase);
_controller = new AnimationController(
value: 1.0,
vsync: this,
);
_controller.addListener(() {
setState(() {
// Trigger rebuild to update opacity value.
});
});
_controller.addStatusListener((AnimationStatus status) {
_updatePhase();
});
super.initState();
}
@override
void didChangeDependencies() {
_imageProvider
.obtainKey(createLocalImageConfiguration(context))
.then<void>((CachedNetworkImageProvider key) {
if (CachedNetworkImage._registeredErrors.contains(key)) {
setState(() => _hasError = true);
}
});
_resolveImage();
super.didChangeDependencies();
}
@override
void didUpdateWidget(CachedNetworkImage oldWidget) {
super.didUpdateWidget(oldWidget);
if (widget.imageUrl != oldWidget.imageUrl ||
widget.placeholder != widget.placeholder) {
_imageProvider = new CachedNetworkImageProvider(widget.imageUrl,
headers: widget.httpHeaders,
errorListener: _imageLoadingFailed);
_resolveImage();
}
}
@override
void reassemble() {
_resolveImage(); // in case the image cache was flushed
super.reassemble();
}
void _resolveImage() {
_imageResolver.resolve(_imageProvider);
if (_phase == ImagePhase.start) _updatePhase();
}
void _updatePhase() {
setState(() {
switch (_phase) {
case ImagePhase.start:
if (_imageResolver._imageInfo != null || _hasError)
_phase = ImagePhase.completed;
else
_phase = ImagePhase.waiting;
break;
case ImagePhase.waiting:
if (_hasError && widget.errorWidget == null) {
_phase = ImagePhase.completed;
return;
}
if (_imageResolver._imageInfo != null || _hasError) {
if (widget.placeholder == null) {
_startFadeIn();
} else {
_startFadeOut();
}
}
break;
case ImagePhase.fadeOut:
if (_controller.status == AnimationStatus.dismissed) {
_startFadeIn();
}
break;
case ImagePhase.fadeIn:
if (_controller.status == AnimationStatus.completed) {
// Done finding in new image.
_phase = ImagePhase.completed;
}
break;
case ImagePhase.completed:
// Nothing to do.
break;
}
});
}
// Received image data. Begin placeholder fade-out.
void _startFadeOut() {
_controller.duration = widget.fadeOutDuration;
_animation = new CurvedAnimation(
parent: _controller,
curve: widget.fadeOutCurve,
);
_phase = ImagePhase.fadeOut;
_controller.reverse(from: 1.0);
}
// Done fading out placeholder. Begin target image fade-in.
void _startFadeIn() {
_controller.duration = widget.fadeInDuration;
_animation = new CurvedAnimation(
parent: _controller,
curve: widget.fadeInCurve,
);
_phase = ImagePhase.fadeIn;
_controller.forward(from: 0.0);
}
@override
void dispose() {
_imageResolver.stopListening();
_controller.dispose();
super.dispose();
}
bool get _isShowingPlaceholder {
assert(_phase != null);
switch (_phase) {
case ImagePhase.start:
case ImagePhase.waiting:
case ImagePhase.fadeOut:
return true;
case ImagePhase.fadeIn:
case ImagePhase.completed:
return _hasError && widget.errorWidget == null;
}
return null;
}
void _imageLoadingFailed() {
_imageProvider
.obtainKey(createLocalImageConfiguration(context))
.then<void>((CachedNetworkImageProvider key) {
if (!CachedNetworkImage._registeredErrors.contains(key)) {
CachedNetworkImage._registeredErrors.add(key);
}
});
_hasError = true;
_updatePhase();
}
@override
Widget build(BuildContext context) {
assert(_phase != ImagePhase.start);
if (_isShowingPlaceholder && widget.placeholder != null) {
return _fadedWidget(widget.placeholder);
}
if (_hasError && widget.errorWidget != null) {
return _fadedWidget(widget.errorWidget);
}
final ImageInfo imageInfo = _imageResolver._imageInfo;
return new RawImage(
image: imageInfo?.image,
width: widget.width,
height: widget.height,
scale: imageInfo?.scale ?? 1.0,
color: new Color.fromRGBO(255, 255, 255, _animation?.value ?? 1.0),
colorBlendMode: BlendMode.modulate,
fit: widget.fit,
alignment: widget.alignment,
repeat: widget.repeat,
matchTextDirection: widget.matchTextDirection,
);
}
Widget _fadedWidget(Widget w) {
return new Opacity(
opacity: _animation?.value ?? 1.0,
child: w,
);
}
@override
void debugFillProperties(DiagnosticPropertiesBuilder description) {
super.debugFillProperties(description);
description.add(new EnumProperty<ImagePhase>('phase', _phase));
description.add(new DiagnosticsProperty<ImageInfo>(
'pixels', _imageResolver._imageInfo));
description.add(new DiagnosticsProperty<ImageStream>(
'image stream', _imageResolver._imageStream));
}
}
typedef void ErrorListener();
class CachedNetworkImageProvider
extends ImageProvider<CachedNetworkImageProvider> {
/// Creates an ImageProvider which loads an image from the [url], using the [scale].
/// When the image fails to load [errorListener] is called.
const CachedNetworkImageProvider(this.url,
{this.scale: 1.0, this.errorListener, this.headers})
: assert(url != null),
assert(scale != null);
/// Web url of the image to load
final String url;
/// Scale of the image
final double scale;
/// Listener to be called when images fails to load.
final ErrorListener errorListener;
// Set headers for the image provider, for example for authentication
final Map<String, String> headers;
@override
Future<CachedNetworkImageProvider> obtainKey(
ImageConfiguration configuration) {
return new SynchronousFuture<CachedNetworkImageProvider>(this);
}
@override
ImageStreamCompleter load(CachedNetworkImageProvider key) {
return new MultiFrameImageStreamCompleter(
codec: _loadAsync(key),
scale: key.scale,
informationCollector: (StringBuffer information) {
information.writeln('Image provider: $this');
information.write('Image key: $key');
});
}
Future<ui.Codec> _loadAsync(CachedNetworkImageProvider key) async {
var cacheManager = await CacheManager.getInstance();
var file = await cacheManager.getFile(url, headers: headers);
if (file == null) {
if (errorListener != null) errorListener();
return Future<ui.Codec>.error("Couldn't download or retreive file.");
}
return await _loadAsyncFromFile(key, file);
}
Future<ui.Codec> _loadAsyncFromFile(
CachedNetworkImageProvider key, File file) async {
assert(key == this);
final Uint8List bytes = await file.readAsBytes();
if (bytes.lengthInBytes == 0) {
if (errorListener != null) errorListener();
throw new Exception("File was empty");
}
return await ui.instantiateImageCodec(bytes);
}
@override
bool operator ==(dynamic other) {
if (other.runtimeType != runtimeType) return false;
final CachedNetworkImageProvider typedOther = other;
return url == typedOther.url && scale == typedOther.scale;
}
@override
int get hashCode => hashValues(url, scale);
@override
String toString() => '$runtimeType("$url", scale: $scale)';
} |
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替换了还是报错：
/Users/cibn/flutter/bin/flutter doctor --verbose [✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3) [✓] iOS toolchain - develop for iOS devices (Xcode 10.2.1) [✓] Android Studio (version 3.3) [✓] VS Code (version 1.34.0) [✓] Connected device (1 available) |
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@zhennayw 你这是什么问题？ |
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@kaina404 |
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@kaina404 |
@override
ImageStreamCompleter load(CachedNetworkImageProvider key) {
return new MultiFrameImageStreamCompleter(
codec: _loadAsync(key),
scale: key.scale);
} |
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@kaina404 删除了报错的三行还是无法运行项目：
FAILURE: Build failed with an exception.
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@yousaywhat 你这样改了么？ |
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@kaina404 |
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@yousaywhat 你介意变更你的dart sdk 跟我相同的版本么？我感觉是dart sdk问题 |
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@kaina404 我现在的Dart版本是2.3.2 不知道如何回退到2.3.0 |
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@yousaywhat 我升级下我的sdk 稍等 |
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flutter channel stable && flutter upgrade 切稳定分支即可, beta的分支果然坑很多. |
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这应该是官方修改了API。 |
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同样的报错，用的是最新的Flutter SDK |
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似乎这样改就可以了： 但是项目中使用的palette_generator还存在着无法通过升级解决的问题 |
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@Wycers 你把palette_generator的依赖中前面的"^"去掉试一试 |
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应该不行，我是直接在pubspec.yaml里把它改到了^0.1.1(这个包在pub上的最新版本)然后pub get了 然后我直接进这个包的源码把那个api修了，现在已经能跑了。 但是这种解决方式非常强行，建议找同类包替换一下。 |
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@Wycers 是这样的 我是使用0.1.0开发的“^”这个玩意表示支持最新版本，所以你要把这个依赖改成 |
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我应该是知道你的意思的。项目在flutter 1.5.4的时候是可以正常运行不需要修改的。 但是flutter前两天把stable channel的版本推到了1.7.8，palette_generator已经在flutter 1.7.8中无法运行了。 |
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恩恩额 好的 @Wycers |
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改动一： @override
ImageStreamCompleter load(CachedNetworkImageProvider key) {
return new MultiFrameImageStreamCompleter(
codec: _loadAsync(key),
scale: key.scale,
// informationCollector: (StringBuffer information) {
// information.writeln('Image provider: $this');
// information.write('Image key: $key');
// }
);
}改动二 void resolve(CachedNetworkImageProvider provider) {
final ImageStream oldImageStream = _imageStream;
_imageStream = provider.resolve(createLocalImageConfiguration(state.context,
size: widget.width != null && widget.height != null
? new Size(widget.width, widget.height)
: null));
if (_imageStream.key != oldImageStream?.key) {
oldImageStream?.removeListener(_handleImageChanged);
_imageStream.addListener(_handleImageChanged);
}
}
get _handleImageChanged => _handleImageChanged2;
void _handleImageChanged2(ImageInfo imageInfo, bool synchronousCall) {
_imageInfo = imageInfo;
listener();
} |
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ok |
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`Compiler message:
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@CalvinLeo 这应该是版本的问题 |
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是我Flutter版本太低吗？ |
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@CalvinLeo 貌似较高🙃 |
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老哥写的真牛逼，就是新版本好像运行不起来。建议老哥更新一下最新版sdk。运行一下 哈哈哈哈哈 |
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运行不了，有一些类提示不存在，而且还有100多个警告！ |
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@HpBoss 我的down下来可以的啊 ,下面是我的环境： |
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我用windows run的 |
好嘛，我更新一下再试 |
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@HpBoss 只是警告而已，命名没有全部小写。 |
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那没法运行啊------------------ 原始邮件 ------------------
发件人: "kaina404"<notifications@github.com>
发送时间: 2019年9月22日(星期天) 晚上9:58
收件人: "kaina404/FlutterDouBan"<FlutterDouBan@noreply.github.com>;
抄送: "Joson"<193220847@qq.com>;"Mention"<mention@noreply.github.com>;
主题: Re: [kaina404/FlutterDouBan] 项目报错 (#36)
@HpBoss 只是警告而已，命名没有全部小写。
—
You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub, or mute the thread.
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@HpBoss 应该还有其他的错误吧，警告不会影响运行的，另外我是使用AS运行的。 |
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大佬你怎么了 不要刷屏啊。。。 |
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项目跑不起来啊 头疼
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cached_network_image和flutter_cache_manager升级至新版本就可以了。 |
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谢谢分享解决了我的问题 |
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项目down下来，就报错，这是怎么回事
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