小编And*_*_id的帖子

当我尝试在我的 flutter 应用程序中构建 android 时，我不断收到此错误。这一切都是在我添加时发生的firebase messaging version 7.0.3。即使删除它后，这个问题仍然存在。

/Users/bright/Desktop/flutter_apps/rush_user_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java:20: error: cannot find symbol\n    flutterEngine.getPlugins().add(new io.flutter.plugins.flutter_plugin_android_lifecycle.FlutterAndroidLifecyclePlugin());\n                                                                                          ^\n  symbol:   class FlutterAndroidLifecyclePlugin                         \n  location: package io.flutter.plugins.flutter_plugin_android_lifecycle \n/Users/bright/Desktop/flutter_apps/rush_user_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java:24: error: cannot find symbol\n    flutterEngine.getPlugins().add(new io.flutter.plugins.googlemaps.GoogleMapsPlugin());\n                                                                    ^   \n  symbol:   class GoogleMapsPlugin                                      \n  location: package io.flutter.plugins.googlemaps                       \n/Users/bright/Desktop/flutter_apps/rush_user_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java:25: error: cannot find symbol\n    flutterEngine.getPlugins().add(new io.flutter.plugins.googlesignin.GoogleSignInPlugin());\n                                                                      ^ \n  symbol:   class GoogleSignInPlugin                                    \n  location: package io.flutter.plugins.googlesignin                     \n/Users/bright/Desktop/flutter_apps/rush_user_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java:26: error: cannot find symbol\n    flutterEngine.getPlugins().add(new io.flutter.plugins.imagepicker.ImagePickerPlugin());\n                                                                     ^  \n  symbol:   class ImagePickerPlugin                                     \n  location: package io.flutter.plugins.imagepicker                      \n/Users/bright/Desktop/flutter_apps/rush_user_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java:30: error: cannot find symbol\n    flutterEngine.getPlugins().add(new …

我正在开发颤振应用程序。运行应用程序时，出现错误 Method not found: 'ButtonTheme.bar'。我尝试清理项目。但仍然存在同样的错误

/C:/Users/RdpUser/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/date_range_picker-1.0.6/lib/date_range_picker.dart:1152:44: Error: Method not found: 'ButtonTheme.bar'.
    final Widget actions = new ButtonTheme.bar(
                                           ^^^
Failed to compile application.

我有一个DataList带有 jsonobject as 的 jsonarray Data，字符串具有不同的值，由字符“´”分隔，这些值分别对应于“Headers”对象，我需要在回收器视图中将其显示为 SL.,InNo,等等，我如何通过拆分给出字符串数组的字符“´”来实现这一点，我还需要将此数据从适配器显示到不同的文本视图，任何想法都会非常有帮助。

   "MainData": {
       "Headers": "SL.>´InNo. - Supp<´InvNo.<´Date^´Value>´Disc.>´Rate´Others>´Amount>",
       "FieldSeparator": "´",
       "DataList": [
           {
               "Data": "1. ´19110 / Textiles´003220´01-sep-2019´70,605.00´0.00´530.25´982.75´118.00´",
               "DataInputType": 1
           },
            {
               "Data": "2. ´19111 / Textiles´7041´01-sep-2019´8,895.00´0.00´444.75´173.25´513.00´",
               "DataInputType": 1
           },

Json 响应具有 gzip 编码字符串。

 var dataList = [
    {"Data": "compressedata"},
    {"Data": "compressedData"}
  ];

我尝试了很多方法来解压字符串，但无法得到预期的结果。最后尝试的方法是

  List<int> res = base64.decode(base64.normalize(zipText));

  print(utf8.decode(res));

其中 zipText 是来自 json 的字符串，这会引发错误

Unhandled Exception: FormatException: Unexpected extension byte (at offset 5)

其他方式

  Uint8List compressed = base64.decode(zipText);
  var gzipBytes = new GZipDecoder().decodeBytes(compressed);
  print(gzipBytes);

抛出错误

Unhandled Exception: FormatException: Invalid GZip Signature flutter

非常感谢任何帮助。

我正在 flutter 中创建动态数据表视图，其中列标题和行值是动态添加的。数据是一个 Json 响应，标题是一个字符串数组，要在行中显示的数据也是一个字符串数组。目标是在表视图中显示数据，而不需要任何硬编码值。\n这就是我尝试过的方法就是显示数据。

                     return ListView.builder(\n                         shrinkWrap: true,\n                         scrollDirection: Axis.vertical,\n                         itemCount: snapshot.data.dataList.length,\n                         itemBuilder: (BuildContext context, int index){\n                           return SingleChildScrollView(\n                             child: DataTable(\n                               columns: (snapshot.data.headerList[index] as List).map((item) =>\n                               DataColumn(\n                                   label:(\n                                       List.generate(item.length,(index){\n                                         return Text(item[index].toString());\n                                       })\n                                   )\n                               )).toList(),\n                               rows: (snapshot.data.dataList[index].dataList as List).map((item) =>\n                               \n                               DataRow(\n                                 \n                                   cells:<DataCell>[\n                                     DataCell(\n                                         List.generate(item.length,(index){\n                                           return Text(item[index].toString());\n                                         })\n                                     )\n                                    ])).toList(),\n                             ),\n

这是 JSON 响应

 "DayEnd": {\n        "ColumnWidths": "40\xc2\xb4168\xc2\xb496\xc2\xb496\xc2\xb4108\xc2\xb4156",\n        "Headers": "SL.>\xc2\xb4Customer< \xc2\xb4Balance Qty>\xc2\xb4Amount>\xc2\xb4Oldest / Recent ",\n        "FieldSeparator": "\xc2\xb4",\n        "DataList": [\n            {\n                "Data": "1. \xc2\xb4ABD \xc2\xb414 / 14.60\xc2\xb411,090\xc2\xb4313 …