我想在页面上生成并显示QR条码。我找到了一个插件 barcode 并阅读了其示例。但我无法显示它。异常信息和我的工作在下面。
错误
The following assertion was thrown resolving an image codec:
I/flutter ( 5048): Unable to load asset: <svg viewBox="0.00000 0.00000 197.52533 197.00000"
I/flutter ( 5048): xmlns="http://www.w3.org/2000/svg"><path d="M 0.26267 0.00000 h 65.66667 v 9.38095 h -65.66667 z M
I/flutter ( 5048): 84.69124 0.00000 h 9.38095 v 9.38095 h -9.38095 z M 103.45314 0.00000 h 18.76190 v 9.38095 h
I/flutter ( 5048): -18.76190 z M 131.59600 0.00000 h 65.66667 v 9.38095 h -65.66667 z M 0.26267 9.38095 h 9.38095 v
I/flutter ( 5048): 9.38095 h -9.38095 z M 56.54838 9.38095 h 9.38095 v 9.38095 h -9.38095 z M 84.69124 9.38095 h
I/flutter ( 5048): 28.14286 v 9.38095 h -28.14286 z M 131.59600 9.38095 h 9.38095 v 9.38095 h -9.38095 z M 187.88171
I/flutter ( 5048): 9.38095 h 9.38095 v 9.38095 h -9.38095 z M 0.26267 18.76190 h 9.38095 v 9.38095 h -9.38095 z M
I/flutter ( 5048): 19.02457 18.76190 h 28.14286 v 9.38095 h -28.14286 z M 56.54838 18.76190 h 9.38095 v 9.38095 h
I/flutter ( 5048): -9.38095 z M 75.31029 18.76190 h 18.76190 v 9.38095 h -18.76190 z M 103.45314 18.76190 h 18.76190 v
I/flutter ( 5048): 9.38095 h -18.76190 z M 131.59600 18.76190 h 9.38095 v 9.38095 h -9.38095 z M 150.35790 18.76190 h
I/flutter ( 5048): 28.14286 v 9.38095 h -28.14286 z M 187.88171 18.76190 h 9.38095 v 9.38095 h -9.38095 z M 0.26267
I/flutter ( 5048): 28.14286 h 9.38095 v 9.38095 h -9.38095 z M 19.02457 28.14286 h 28.14286 v 9.38095 h -28.14286 z M
I/flutter ( 5048): 56.54838 28.14286 h 9.38095 v 9.38095 h -9.38095 z M 84.69124 28.14286 h 9.38095 v 9.38095 h
I/flutter ( 5048): -9.38095 z M 103.45314 28.14286 h 9.38095 v 9.38095 h -9.38095 z M 131.59600 28.14286 h 9.38095 v
I/flutter ( 5048): 9.38095 h -9.38095 z M 150.35790 28.14286 h 28.14286 v 9.38095 h -28.14286 z M 187.88171 28.14286 h
I/flutter ( 5048): 9.38095 v 9.38095 h -9.38095 z M 0.26267 37.52381 h 9.38095 v 9.38095 h -9.38095 z M 19.02457
I/flutter ( 5048): 37.52381 h 28.14286 v 9.38095 h -28.14286 z M 56.54838 37.52381 h 9.38095 v 9.38095 h -9.38095 z M
I/flutter ( 5048): 94.07219 37.52381 h 9.38095 v 9.38095 h -9.38095 z M 112.83410 37.52381 h 9.38095 v 9.38095 h
I/flutter ( 5048): -9.38095 z M 131.59600 37.52381 h 9.38095 v 9.38095 h -9.38095 z M 150.35790 37.52381 h 28.14286 v
I/flutter ( 5048): 9.38095 h -28.14286 z M 187.88171 37.52381 h 9.38095 v 9.38095 h -9.38095 z M 0.26267 46.90476 h
I/flutter ( 5048): 9.38095 v 9.38095 h -9.38095 z M 56.54838 46.90476 h 9.38095 v 9.38095 h -9.38095 z M 112.83410
I/flutter ( 5048): 46.90476 h 9.38095 v 9.38095 h -9.38095 z M 131.59600 46.90476 h 9.38095 v 9.38095 h -9.38095 z M
I/flutter ( 5048): 187.88171 46.90476 h 9.38095 v 9.38095 h -9.38095 z M 0.26267 56.28571 h 65.66667 v 9.38095 h
I/flutter ( 5048): -65.66667 z M 75.31029 56.28571 h 9.38095 v 9.38095 h -9.38095 z M 94.07219 56.28571 h 9.38095 v
I/flutter ( 5048): 9.38095 h -9.38095 z M 112.83410 56.28571 h 9.38095 v 9.38095 h -9.38095 z M 131.59600 56.28571 h
I/flutter ( 5048): 65.66667 v 9.38095 h -65.66667 z M 75.31029 65.66667 h 18.76190 v 9.38095 h -18.76190 z M 103.45314
I/flutter ( 5048): 65.66667 h 18.76190 v 9.38095 h -18.76190 z M 0.26267 75.04762 h 28.14286 v 9.38095 h -28.14286 z M
I/flutter ( 5048): 37.78648 75.04762 h 75.04762 v 9.38095 h -75.04762 z M 122.21505 75.04762 h 18.76190 v 9.38095 h
I/flutter ( 5048): -18.76190 z M 169.11981 75.04762 h 9.38095 v 9.38095 h -9.38095 z M 9.64362 84.42857 h 18.76190 v
I/flutter ( 5048): 9.38095 h -18.76190 z M 47.16743 84.42857 h 9.38095 v 9.38095 h -9.38095 z M 84.69124 84.42857 h
I/flutter ( 5048): 9.38095 v 9.38095 h -9.38095 z M 131.59600 84.42857 h 9.38095 v 9.38095 h -9.38095 z M 169.11981
I/flutter ( 5048): 84.42857 h 18.76190 v 9.38095 h -18.76190 z M 0.26267 93.80952 h 18.76190 v 9.38095 h -18.76190 z M
I/flutter ( 5048): 47.16743 93.80952 h 18.76190 v 9.38095 h -18.76190 z M 94.07219 93.80952 h 9.38095 v 9.38095 h
I/flutter ( 5048): -9.38095 z M 112.83410 93.80952 h 9.38095 v 9.38095 h -9.38095 z M 150.35790 93.80952 h 9.38095 v
I/flutter ( 5048): 9.38095 h -9.38095 z M 187.88171 93.80952 h 9.38095 v 9.38095 h -9.38095 z M 9.64362 103.19048 h
I/flutter ( 5048): 9.38095 v 9.38095 h -9.38095 z M 65.92933 103.19048 h 18.76190 v 9.38095 h -18.76190 z M 94.07219
I/flutter ( 5048): 103.19048 h 9.38095 v 9.38095 h -9.38095 z M 131.59600 103.19048 h 9.38095 v 9.38095 h -9.38095 z M
I/flutter ( 5048): 169.11981 103.19048 h 28.14286 v 9.38095 h -28.14286 z M 19.02457 112.57143 h 9.38095 v 9.38095 h
I/flutter ( 5048): -9.38095 z M 56.54838 112.57143 h 18.76190 v 9.38095 h -18.76190 z M 84.69124 112.57143 h 9.38095 v
I/flutter ( 5048): 9.38095 h -9.38095 z M 112.83410 112.57143 h 9.38095 v 9.38095 h -9.38095 z M 131.59600 112.57143 h
I/flutter ( 5048): 9.38095 v 9.38095 h -9.38095 z M 150.35790 112.57143 h 9.38095 v 9.38095 h -9.38095 z M 169.11981
I/flutter ( 5048): 112.57143 h 28.14286 v 9.38095 h -28.14286 z M 75.31029 121.95238 h 18.76190 v 9.38095 h -18.76190 z
I/flutter ( 5048): M 103.45314 121.95238 h 9.38095 v 9.38095 h -9.38095 z M 122.21505 121.95238 h 9.38095 v 9.38095 h
I/flutter ( 5048): -9.38095 z M 140.97695 121.95238 h 9.38095 v 9.38095 h -9.38095 z M 159.73886 121.95238 h 9.38095 v
I/flutter ( 5048): 9.38095 h -9.38095 z M 187.88171 121.95238 h 9.38095 v 9.38095 h -9.38095 z M 0.26267 131.33333 h
I/flutter ( 5048): 65.66667 v 9.38095 h -65.66667 z M 75.31029 131.33333 h 18.76190 v 9.38095 h -18.76190 z M 103.45314
I/flutter ( 5048): 131.33333 h 9.38095 v 9.38095 h -9.38095 z M 122.21505 131.33333 h 28.14286 v 9.38095 h -28.14286 z
I/flutter ( 5048): M 159.73886 131.33333 h 18.76190 v 9.38095 h -18.76190 z M 187.88171 131.33333 h 9.38095 v 9.38095 h
I/flutter ( 5048): -9.38095 z M 0.26267 140.71429 h 9.38095 v 9.38095 h -9.38095 z M 56.54838 140.71429 h 9.38095 v
I/flutter ( 5048): 9.38095 h -9.38095 z M 75.31029 140.71429 h 18.76190 v 9.38095 h -18.76190 z M 103.45314 140.71429 h
I/flutter ( 5048): 28.14286 v 9.38095 h -28.14286 z M 140.97695 140.71429 h 28.14286 v 9.38095 h -28.14286 z M 0.26267
I/flutter ( 5048): 150.09524 h 9.38095 v 9.38095 h -9.38095 z M 19.02457 150.09524 h 28.14286 v 9.38095 h -28.14286 z M
I/flutter ( 5048): 56.54838 150.09524 h 9.38095 v 9.38095 h -9.38095 z M 75.31029 150.09524 h 37.52381 v 9.38095 h
I/flutter ( 5048): -37.52381 z M 122.21505 150.09524 h 28.14286 v 9.38095 h -28.14286 z M 159.73886 150.09524 h
I/flutter ( 5048): 18.76190 v 9.38095 h -18.76190 z M 187.88171 150.09524 h 9.38095 v 9.38095 h -9.38095 z M 0.26267
I/flutter ( 5048): 159.47619 h 9.38095 v 9.38095 h -9.38095 z M 19.02457 159.47619 h 28.14286 v 9.38095 h -28.14286 z M
I/flutter ( 5048): 56.54838 159.47619 h 9.38095 v 9.38095 h -9.38095 z M 94.07219 159.47619 h 9.38095 v 9.38095 h
I/flutter ( 5048): -9.38095 z M 131.59600 159.47619 h 9.38095 v 9.38095 h -9.38095 z M 169.11981 159.47619 h 18.76190 v
I/flutter ( 5048): 9.38095 h -18.76190 z M 0.26267 168.85714 h 9.38095 v 9.38095 h -9.38095 z M 19.02457 168.85714 h
I/flutter ( 5048): 28.14286 v 9.38095 h -28.14286 z M 56.54838 168.85714 h 9.38095 v 9.38095 h -9.38095 z M 75.31029
I/flutter ( 5048): 168.85714 h 28.14286 v 9.38095 h -28.14286 z M 112.83410 168.85714 h 9.38095 v 9.38095 h -9.38095 z
I/flutter ( 5048): M 150.35790 168.85714 h 9.38095 v 9.38095 h -9.38095 z M 187.88171 168.85714 h 9.38095 v 9.38095 h
I/flutter ( 5048): -9.38095 z M 0.26267 178.23810 h 9.38095 v 9.38095 h -9.38095 z M 56.54838 178.23810 h 9.38095 v
I/flutter ( 5048): 9.38095 h -9.38095 z M 75.31029 178.23810 h 28.14286 v 9.38095 h -28.14286 z M 131.59600 178.23810 h
I/flutter ( 5048): 9.38095 v 9.38095 h -9.38095 z M 169.11981 178.23810 h 18.76190 v 9.38095 h -18.76190 z M 0.26267
I/flutter ( 5048): 187.61905 h 65.66667 v 9.38095 h -65.66667 z M 75.31029 187.61905 h 18.76190 v 9.38095 h -18.76190 z
I/flutter ( 5048): M 112.83410 187.61905 h 9.38095 v 9.38095 h -9.38095 z M 131.59600 187.61905 h 9.38095 v 9.38095 h
I/flutter ( 5048): -9.38095 z M 150.35790 187.61905 h 9.38095 v 9.38095 h -9.38095 z M 169.11981 187.61905 h 28.14286 v
I/flutter ( 5048): 9.38095 h -28.14286 z " style="fill: #000000"/><text style="fill: #000000; font-family:
I/flutter ( 5048): "monospace"; font-size: 39.40000px" x="0.00000" y="0.00000"></text></svg>
I/flutter ( 5048):
I/flutter ( 5048): When the exception was thrown, this was the stack:
I/flutter ( 5048): #0 PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:221:7)
I/flutter ( 5048): <asynchronous suspension>
I/flutter ( 5048): #1 AssetBundleImageProvider._loadAsync (package:flutter/src/painting/image_provider.dart:664:31)
I/flutter ( 5048): #2 AssetBundleImageProvider.load (package:flutter/src/painting/image_provider.dart:648:14)
I/flutter ( 5048): #3 ImageProvider.resolveStreamForKey.<anonymous closure> (package:flutter/src/painting/image_provider.dart:501:13)
I/flutter ( 5048): #4 ImageCache.putIfAbsent (package:flutter/src/painting/image_cache.dart:359:22)
I/flutter ( 5048): #5 ImageProvider.resolveStreamForKey (package:flutter/src/painting/image_provider.dart:499:80)
I/flutter ( 5048): #6 ScrollAwareImageProvider.resolveStreamForKey (package:flutter/src/widgets/scroll_aware_image_provider.dart:106:19)
I/flutter ( 5048): #7 ImageProvider.resolve.<anonymous closure> (package:flutter/src/painting/image_provider.dart:330:9)
I/flutter ( 5048): #8 ImageProvider._createErrorHandlerAndKey.<anonymous closure>.<anonymous closure> (package:flutter/src/painting/image_provider.
dart:460:26)
I/flutter ( 5048): #9 SynchronousFuture.then (package:flutter/src/foundation/synchronous_future.dart:41:29)
I/flutter ( 5048): #10 ImageProvider._createErrorHandlerAndKey.<anonymous closure> (package:flutter/src/painting/image_provider.dart:457:11)
I/flutter ( 5048): #14 ImageProvider._createErrorHandlerAndKey (package:flutter/src/painting/image_provider.dart:449:16)
I/flutter ( 5048): #15 ImageProvider.resolve (package:flutter/src/painting/image_provider.dart:327:5)
I/flutter ( 5048): #16 _ImageState._resolveImage (package:flutter/src/widgets/image.dart:1099:16)
I/flutter ( 5048): #17 _ImageState.reassemble (package:flutter/src/widgets/image.dart:1084:5)
I/flutter ( 5048): #18 StatefulElement.reassemble (package:flutter/src/widgets/framework.dart:4631:11)
I/flutter ( 5048): #19 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #20 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #21 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #22 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #23 MultiChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5929:16)
I/flutter ( 5048): #24 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #25 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #26 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5817:14)
I/flutter ( 5048): #27 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #28 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #29 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #30 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #31 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #32 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #33 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #34 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #35 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #36 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #37 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #38 MultiChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5929:16)
I/flutter ( 5048): #39 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #40 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #41 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #42 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #43 StatefulElement.reassemble (package:flutter/src/widgets/framework.dart:4632:11)
I/flutter ( 5048): #44 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #45 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #46 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #47 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #48 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #49 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #50 StatefulElement.reassemble (package:flutter/src/widgets/framework.dart:4632:11)
I/flutter ( 5048): #51 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #52 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5817:14)
I/flutter ( 5048): #53 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #54 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #55 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #56 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #57 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #58 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5817:14)
I/flutter ( 5048): #59 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #60 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #61 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #62 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #63 StatefulElement.reassemble (package:flutter/src/widgets/framework.dart:4632:11)
I/flutter ( 5048): #64 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #65 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #66 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #67 StatefulElement.reassemble (package:flutter/src/widgets/framework.dart:4632:11)
I/flutter ( 5048): #68 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #69 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #70 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #71 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #72 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #73 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #74 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #75 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
I/flutter ( 5048): #76 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #77 StatefulElement.reassemble (package:flutter/src/widgets/framework.dart:4632:11)
I/flutter ( 5048): #78 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #79 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5817:14)
I/flutter ( 5048): #80 Element.reassemble (package:flutter/src/widgets/framework.dart:2990:5)
I/flutter ( 5048): #81 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:2991:13)
I/flutter ( 5048): #82 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4556:14)
Container(
child: Image.asset(Barcode.qrCode().toSvg(
widget.result,
width: ScreenUtil.dpWidth(197),
height: ScreenUtil.dpHeight(197),
)),
),
最佳答案
请阅读您使用的软件包的文档。它指出
If you want to display barcodes in a Flutter application, use pub:barcode_widget.
您需要在pubspec.yaml中添加
barcode_widget作为依赖项。然后使用
BarcodeWidget小部件显示条形码。BarcodeWidget(
barcode: Barcode.qrCode(),
data: widget.result,
width: ScreenUtil.dpWidth(197),
height: ScreenUtil.dpHeight(197),
)
您的当前代码无法正常运行，因为flutter本身不支持显示SVG。此外，您正在传递不受支持的SVG字符串作为 Assets 名称。
Image.asset应该仅用于 Assets ，而不用于动态获取的数据。
关于flutter - 如何使用Flutter条形码插件显示二维条形码？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/64492984/