【发布时间】：2021-09-09 07:08:02
【问题描述】：
我正在尝试显示作为 API 响应的图像。 下面是显示图片的代码-:
String ProfilePic;
CircleAvatar(
radius: 80,
backgroundImage:
ProfilePic != null ?
NetworkImage('$ProfilePic'):
// AssetImage('$ProfilePic') :
AssetImage('assets/favicon.png'),
),
作为回应，我从 API 获取这些数据 -: I/flutter (4230): pexels-lisa-1107717.jpg
当我使用它时出现以下错误 -:
======== Exception caught by image resource service ================================================
The following ArgumentError was thrown resolving an image codec:
Invalid argument(s): No host specified in URI file:///null
When the exception was thrown, this was the stack:
#0 _HttpClient._openUrl (dart:_http/http_impl.dart:2662:9)
#1 _HttpClient.getUrl (dart:_http/http_impl.dart:2573:48)
#2 NetworkImage._loadAsync (package:flutter/src/painting/_network_image_io.dart:89:59)
#3 NetworkImage.load (package:flutter/src/painting/_network_image_io.dart:50:14)
#4 ImageProvider.resolveStreamForKey.<anonymous closure> (package:flutter/src/painting/image_provider.dart:505:13)
#5 ImageCache.putIfAbsent (package:flutter/src/painting/image_cache.dart:380:22)
#6 ImageProvider.resolveStreamForKey (package:flutter/src/painting/image_provider.dart:503:83)
#7 ImageProvider.resolve.<anonymous closure> (package:flutter/src/painting/image_provider.dart:333:9)
#8 ImageProvider._createErrorHandlerAndKey.<anonymous closure>.<anonymous closure> (package:flutter/src/painting/image_provider.dart:464:26)
#9 SynchronousFuture.then (package:flutter/src/foundation/synchronous_future.dart:41:35)
#10 ImageProvider._createErrorHandlerAndKey.<anonymous closure> (package:flutter/src/painting/image_provider.dart:461:11)
#14 ImageProvider._createErrorHandlerAndKey (package:flutter/src/painting/image_provider.dart:453:16)
#15 ImageProvider.resolve (package:flutter/src/painting/image_provider.dart:330:5)
#16 DecorationImagePainter.paint (package:flutter/src/painting/decoration_image.dart:258:55)
#17 _BoxDecorationPainter._paintBackgroundImage (package:flutter/src/painting/box_decoration.dart:465:20)
#18 _BoxDecorationPainter.paint (package:flutter/src/painting/box_decoration.dart:483:5)
#19 RenderDecoratedBox.paint (package:flutter/src/rendering/proxy_box.dart:2162:17)
#20 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2409:7)
#21 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:189:13)
#22 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#23 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2409:7)
#24 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:189:13)
#25 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2794:15)
#26 RenderStack.paintStack (package:flutter/src/rendering/stack.dart:629:5)
#27 RenderStack.paint (package:flutter/src/rendering/stack.dart:645:7)
#28 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2409:7)
#29 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:189:13)
#30 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#31 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2409:7)
#32 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:189:13)
#33 RenderShiftedBox.paint (package:flutter/src/rendering/shifted_box.dart:79:15)
#34 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2409:7)
#35 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:189:13)
#36 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2794:15)
#37 RenderFlex.paint (package:flutter/src/rendering/flex.dart:1078:7)
#38 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2409:7)
#39 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:189:13)
#40 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2794:15)
#41 RenderFlex.paint (package:flutter/src/rendering/flex.dart:1078:7)
#42 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2409:7)
#43 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:189:13)
#44 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#45 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2409:7)
#46 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:189:13)
#47 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2794:15)
#48 RenderFlex.paint (package:flutter/src/rendering/flex.dart:1078:7)
#49 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2409:7)
#50 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:189:13)
#51 _RenderSingleChildViewport.paint.paintContents (package:flutter/src/widgets/single_child_scroll_view.dart:619:17)
#52 PaintingContext.pushLayer (package:flutter/src/rendering/object.dart:398:12)
#53 PaintingContext.pushClipRect (package:flutter/src/rendering/object.dart:454:7)
#54 _RenderSingleChildViewport.paint (package:flutter/src/widgets/single_child_scroll_view.dart:623:40)
#55 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2409:7)
#56 PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:141:11)
#57 PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:100:5)
#58 PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:979:29)
#59 RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:455:19)
#60 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:883:13)
#61 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:319:5)
#62 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1143:15)
#63 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1080:9)
#64 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:996:5)
#68 _invoke (dart:ui/hooks.dart:166:10)
#69 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:270:5)
#70 _drawFrame (dart:ui/hooks.dart:129:31)
(elided 6 frames from dart:async)
Image provider: NetworkImage("null", scale: 1.0)
Image key: NetworkImage("null", scale: 1.0)
====================================================================================================
我使用了网络图像，但仍然无法显示图像。我也尝试过其他解决方案，但似乎没有任何效果。
谁能帮我展示一下这个？
【问题讨论】：
-
profilepic 可以为 null 的情况，请您在获取数据的地方添加示例 json mock。
标签： flutter api imagepicker