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I want to generate and display a QR barcode on my page. I found a plugin barcode and read its examples. But I just cannot display it. Exception info and my work is below.

Error

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): &quot;monospace&quot;; 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), )), ),
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Please read the documentation of the package you are using. It states

If you want to display barcodes in a Flutter application, use pub:barcode_widget.

You need to add barcode_widget as a dependency in your pubspec.yaml. Then use the BarcodeWidget widget to display your barcode.

BarcodeWidget( barcode: Barcode.qrCode(), data: widget.result, width: ScreenUtil.dpWidth(197), height: ScreenUtil.dpHeight(197), )

Your current code does not work as flutter does not natively support displaying SVGs. Additionally, you are passing the unsupported SVG string as the name of an asset. Image.asset should only be used for assets, not for dynamically obtained data.

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2 Comments

thanks for your edit and solution. I'm new to both flutter and StackOverflow, another thing could you please tell me how to layout my error info in StackOverflow, I always put it chaotically. My method is clicked the ” and paste the info then it looks like my former style.
@byhuang1998 Use triple backticks "```". You can look at how I edited your question by going to the edit window yourself.

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