Flutter：每次安装新软件包时均显示“无法解析该软件包”

Question

我对从pub.dev安装新软件包有一些问题。我使用以下命令在根项目中创建自己的包：

flutter create --template=package main_template

结构文件夹

我在 main_template 而不是 lib 中安装了新软件包。我在 main_template 中每次安装新软件包都收到此错误：

Compiler message:
Error: Could not resolve the package 'device_info' in 'package:device_info/device_info.dart'.
sinergi_flutter_template/main_template/lib/variable/get_device_id.dart:3:8: Error: Not found: 'package:device_info/device_info.dart'
import 'package:device_info/device_info.dart';
       ^
sinergi_flutter_template/main_template/lib/variable/get_device_id.dart:9:11: Error: 'DeviceInfoPlugin' isn't a type.
    final DeviceInfoPlugin deviceInfoPlugin = DeviceInfoPlugin();
          ^^^^^^^^^^^^^^^^
sinergi_flutter_template/main_template/lib/variable/get_device_id.dart:9:47: Error: The method 'DeviceInfoPlugin' isn't defined for the class 'GetDeviceId'.
 - 'GetDeviceId' is from 'package:main_template/variable/get_device_id.dart' ('sinergi_flutter_template/main_template/lib/variable/get_device_id.dart').
Try correcting the name to the name of an existing method, or defining a method named 'DeviceInfoPlugin'.
    final DeviceInfoPlugin deviceInfoPlugin = DeviceInfoPlugin();
                                              ^^^^^^^^^^^^^^^^
U
nhandled exception:
FileSystemException(uri=org-dartlang-u
ntranslatable-uri:package%3Adevice_info%2Fdevice_info.dart; message=StandardFileSystem only supports file:* and data:* URIs)
#0      StandardFileSystem.entityForUri  (package:front_end/src/api_prototype/standard_file_system.dart:33:7)
#1      asFileUri ( (package:vm/kernel_front_end.dart:604:3)
7)
#2      writeDepfile  (package:vm/kernel_front_end.dart:799:21)
<asynchronous suspension>
#3      FrontendCompiler.compile  (package:frontend_server/frontend_server.dart:472:15)
<asynchronous suspension>
#4      _FlutterFrontendCompiler.compile (package:flut
ter_frontend_server/server.dart:38:22)
#5      starter  (package:flutter_frontend_server/server.dart:149:27)
#6      main  (file:///C:/b/s/w/ir/cache/builder/src/flutter/flutter_frontend_server/bin/starter.dart:8:30)
#7      _startIsolate.<anonymous closure>  (dart:isolate-patch/isolate_patch.dart:305:32)
#8      _RawReceivePortImpl._handleMessage  (dart:isolate-patch/isolate_patch.dart:174:12)
Target kernel_snapshot failed: Exception: Errors during snapshot creation: null
build failed.

FAILURE: Build failed with an exception.

* Where:
Script 'C:\flutter\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 780

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\flutter\flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 20s
Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

直到现在，我尝试安装3个软件包[Cache Network Image，Device Info，SplashScreen]。而且所有软件包都会给我这个错误。

我该如何解决？

Answer 1

您在使用vs代码吗？

只需重新启动或关闭vs代码应用程序（在所有窗口中），然后再次运行即可将其打开

flutter pub get

Answer 2

此命令解决了我的问题：

flutter pub get

Answer 3

我和你有同样的问题。就我而言，我有2个模块（软件包core和shared）。在shared模块中，我添加了一个像shimmer和cached_network_image这样的新包，用于创建自定义窗口小部件。另外，我可以import并使用已经在shared模块中添加的程序包。但是，在运行项目之后，我得到了诸如Could not resolved the package ...之类的信息的错误。因此，要解决此问题，只需将shimmer和cached_network_image包添加到我的根项目中。因此，为此，我已经添加了2x包。在shared模块和根项目中。因此，如果出现该错误，我认为您也应该这样做。

就我而言，这需要2次将新包添加到pubspec.yml中，json_serializable，shimmer，cached_network_image

并非所有内容都必须添加两次，而仅添加会导致错误的内容。

Answer 4

从您的项目中删除.idea文件夹，然后重新启动android studio对我来说效果很好

Answer 5

安装characters package解决了我的问题。