Flutter疑难杂症

1、搭建Flutter 安卓运行环境时，遇到下面这个问题：

Error message:
A problem was found with the configuration of task ':app:processDebugResources'. > File 'C:\Users\user\AppData\Local\Android\sdk\platforms\android-28\android.jar' specified for property 'androidJar' does not exist.

解决：
确认安卓SDK已安装的前提下，按以下步骤操作：
去到 \Users\user\AppData\Local\Android\sdk\platforms\android-29，然后将
android.jar file 拷贝到 android-28 目录上。重新运行即可。

2、运行Flutter 项目，遇到下面这个问题：

** BUILD FAILED **
Xcode's output:
↳
Writing result bundle at path:
/var/folders/4w/vyrtq4g54p16r733bx9cr79r0000gn/T/flutter_tools.4cs7Wl/flutter_ios_build_temp_dirwm3X6w/temporary_xcresult_bundle
Error: Cannot run with sound null safety, because the following dependencies
don't support null safety:
package:english_words
For solutions, see https://dart.dev/go/unsound-null-safety
Failed to package /Users/pilipala/Documents/FlutterProjects/day01.
Command PhaseScriptExecution failed with a nonzero exit code

解决：
使用命令，在运行的时候添加参数，如下所示：
flutter run --no-sound-null-safety
即可，如下图所示：

image.png