我正在使用flutter_advanced_networkimage库使用标头从服务器加载图像。但这使我例外。这是我的代码：
Image(
image: AdvancedNetworkImage(
'${widget.imageURL}',
header: {
"Authorization": this.authCode,
},
useDiskCache: true,
),
fit: BoxFit.cover,
),
错误是：
flutter: This is image URL https://WEBSITEURL.ch/static/activities/picmee/1_01032019203603_0.png
flutter: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
flutter: The following FormatException was thrown building PicMeeTile(dirty, state: _PicMeeTileState#0993e):
flutter: Invalid character (at character 6)
flutter: https://WEBSITEURL.ch/static/activities/picmee/1_01032019203603_0.png
flutter: ^
flutter:
flutter: When the exception was thrown, this was the stack:
flutter: #0 _Base64Decoder.decodeChunk (dart:convert/base64.dart:675:7)
flutter: #1 _Base64Decoder.decode (dart:convert/base64.dart:600:14)
flutter: #2 Base64Decoder.convert (dart:convert/base64.dart:480:26)
flutter: #3 Base64Codec.decode (dart:convert/base64.dart:77:47)
flutter: #4 _PicMeeTileState.build (package:app/screens/picmee/list/picmeetile.dart:87:27)
flutter: #5 StatefulElement.build (package:flutter/src/widgets/framework.dart:3809:27)
flutter: #6 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3721:15)
flutter: #7 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: #8 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: #9 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3848:11)
flutter: #10 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: #11 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: #12 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: #13 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
flutter: #14 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: #15 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: #16 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
flutter: #17 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: #18 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: #19 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
flutter: #20 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: #21 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: #22 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: #23 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: #24 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: #25 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
flutter: #26 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: #27 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: #28 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: #29 ParentDataElement.mount (package:flutter/src/widgets/framework.dart:4047:11)
flutter: #30 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: #31 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: #32 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
flutter: #33 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: #34 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: #35 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3848:11)
flutter: #36 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: #37 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: #38 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: #39 SliverMultiBoxAdaptorElement.updateChild (package:flutter/src/widgets/sliver.dart:1030:36)
flutter: #40 SliverMultiBoxAdaptorElement.createChild.<anonymous closure> (package:flutter/src/widgets/sliver.dart:1015:20)
flutter: #41 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2266:19)
flutter: #42 SliverMultiBoxAdaptorElement.createChild (package:flutter/src/widgets/sliver.dart:1008:11)
flutter: #43 RenderSliverMultiBoxAdaptor._createOrObtainChild.<anonymous closure> (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:274:23)
flutter: #44 RenderObject.invokeLayoutCallback.<anonymous closure> (package:flutter/src/rendering/object.dart:1730:58)
flutter: #45 PipelineOwner._enableMutationsToDirtySubtrees (package:flutter/src/rendering/object.dart:799:15)
flutter: #46 RenderObject.invokeLayoutCallback (package:flutter/src/rendering/object.dart:1730:13)
flutter: #47 RenderSliverMultiBoxAdaptor._createOrObtainChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:263:5)
flutter: #48 RenderSliverMultiBoxAdaptor.addInitialChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:347:5)
flutter: #49 RenderSliverList.performLayout (package:flutter/src/rendering/sliver_list.dart:78:12)
flutter: #50 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #51 RenderSliverPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:182:11)
flutter: #52 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #53 RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:405:13)
flutter: #54 RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1316:12)
flutter: #55 RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1234:20)
flutter: #56 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #57 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: #58 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #59 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: #60 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #61 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: #62 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #63 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: #64 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #65 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: #66 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #67 MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:142:11)
flutter: #68 _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:339:7)
flutter: #69 MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:212:7)
flutter: #70 RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:356:14)
flutter: #71 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #72 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: #73 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #74 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: #75 _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1203:11)
flutter: #76 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: #77 MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:142:11)
flutter: #78 _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:339:7)
flutter: #79 MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:212:7)
flutter: #80 RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:356:14)
flutter: #81 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1509:7)
flutter: #82 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:768:18)
flutter: #83 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:281:19)
flutter: #84 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:686:13)
flutter: #85 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:219:5)
flutter: #86 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:990:15)
flutter: #87 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:930:9)
flutter: #88 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:842:5)
flutter: #89 _invoke (dart:ui/hooks.dart:159:13)
flutter: #90 _drawFrame (dart:ui/hooks.dart:148:3)
flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════
flutter: This is image URL https://WEBSITEURL.ch/static/activities/picmee/1_01032019203603_0.png
flutter: Another exception was thrown: FormatException: Invalid character (at character 6)
答案 0 :(得分：0)
堆栈跟踪似乎与所示代码无关。它似乎来自picmeetile.dart line 87，那里有一个以64为基数的解码。显然，要解码的字符串不是有效的64位。