获取"Assertion failed:_pressedKeys.containsKey(event.physicalKey)“error in Flutter Web”
获取"Assertion failed:_pressedKeys.containsKey(event.physicalKey)“error in Flutter Web”
提问于 2021-09-09 07:28:27
我通过POST请求从API获取数据。然后，我在GridView构建器中填充了数据。但当我滚动网页版的应用程序时，它给了我这个错误：
════════ Exception caught by services library ══════════════════════════════════
The following assertion was thrown during a platform message callback:
Assertion failed:
../…/services/hardware_keyboard.dart:441
_pressedKeys.containsKey(event.physicalKey)
"A KeyUpEvent is dispatched, but the state shows that the physical key is not pressed. If this occurs in real application, please report this bug to Flutter. If this occurs in unit tests, please ensure that simulated events follow Flutter's event model as documented in `HardwareKeyboard`. This was the event: KeyUpEvent#6f053(physicalKey: PhysicalKeyboardKey#700e3(usbHidUsage: \"0x000700e3\", debugName: \"Meta Left\"), logicalKey: LogicalKeyboardKey#4b191(keyId: \"0x200000106\", keyLabel: \"Meta Left\", debugName: \"Meta Left\"), character: null, timeStamp: 0:01:32.201000, synthesized)"
When the exception was thrown, this was the stack
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49 throw_
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 29:3 assertFailed
packages/flutter/src/services/hardware_keyboard.dart 441:46 <fn>
packages/flutter/src/services/hardware_keyboard.dart 451:14 [_assertEventIsRegular]
packages/flutter/src/services/hardware_keyboard.dart 543:5 handleKeyEvent
packages/flutter/src/services/hardware_keyboard.dart 821:57 handleRawKeyMessage
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54 runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5 _async
packages/flutter/src/services/hardware_keyboard.dart 808:51 handleRawKeyMessage
packages/flutter/src/services/platform_channel.dart 73:49 <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54 runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5 _async
packages/flutter/src/services/platform_channel.dart 72:58 <fn>
packages/flutter/src/services/binding.dart 379:35 <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54 runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5 _async
packages/flutter/src/services/binding.dart 376:98 <fn>
lib/_engine/engine/platform_dispatcher.dart 1034:13 invoke2
lib/ui/src/ui/channel_buffers.dart 25:5 invoke
lib/ui/src/ui/channel_buffers.dart 65:7 push
lib/ui/src/ui/channel_buffers.dart 130:16 push
lib/_engine/engine/platform_dispatcher.dart 302:25 invokeOnPlatformMessage
lib/_engine/engine/keyboard.dart 130:39 [_handleHtmlEvent]
lib/_engine/engine/keyboard.dart 39:7 <fn>
════════════════════════════════════════════════════════════════════════════════这是用于填充GridView的代码。GridView没有任何错误或问题。数据填充得很好，但只要我开始滚动，上面的错误就会显示在调试控制台中。此外，滚动非常滞后。看起来好像动画已经完全被破坏了。
@override
Widget build(BuildContext context) {
return Container(
child: Scaffold(
body: Row(
children: [
SideDrawer(),
Container(
padding: EdgeInsets.all(20),
width: MediaQuery.of(context).size.width * 0.77,
child: FutureBuilder<dynamic>(
future: appList(),
builder: (context, snapshot) {
if (snapshot.data == null) {
return Center(
child: CircularProgressIndicator(),
);
} else {
return GridView.builder(
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 5,
childAspectRatio: 3 / 2,
crossAxisSpacing: 10,
mainAxisSpacing: 10),
itemCount: snapshot.data.length - 1,
itemBuilder: (context, index) {
return Card(
elevation: 2,
child: ListTile(
leading: Text(snapshot.data[index]["title"]),
),
);
},
);
}
},
),
),
],
)),
);
}任何帮助都是值得欣赏的。非常感谢。
回答 1
Stack Overflow用户
发布于 2021-09-09 07:36:49
在GridView.builder下添加shrinkWrap: true和physics: ScrollPhysics(),这两行
return Scaffold(
drawer: SideDrawer(),
body: Container(
padding: EdgeInsets.all(20),
width: MediaQuery.of(context).size.width * 0.77,
child: FutureBuilder<dynamic>(
future: appList(),
builder: (context, snapshot) {
if (snapshot.data == null) {
return Center(
child: CircularProgressIndicator(),
);
} else {
return GridView.builder(
shrinkWrap: true,
physics: ScrollPhysics(),
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 5,
childAspectRatio: 3 / 2,
crossAxisSpacing: 10,
mainAxisSpacing: 10),
itemCount: snapshot.data.length - 1,
itemBuilder: (context, index) {
return Card(
elevation: 2,
child: ListTile(
leading: Text(snapshot.data[index]["title"]),
),
);
},
);
}
},
),
),
);页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/69113977
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