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升级后出现inspector不能加载，
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1.升级flutter sdk
运行 flutter upgrade
报错：Your flutter checkout has local changes that would be erased by upgrading. If you want to keep these changes, it is recommended that you stash them via "git stash" or else commit the changes to a local branch. If it is okay to remove local changes, then re-run this command with "--force".
再运行：flutter upgrade --force
最后升级成功 ，问题解决
2.降低devtools版本来解决
dart pub global activate devtools -v 2.8.0
只能说 Flutter 确实很强大
ffmpeg 插件，文档没给出如何给视频添加水印, 但是给出了执行命令的方法演示， 这就足够了。
添加一个水印:
String command = "-i " + inputVideoPath +
" -i "+waterMarkPath+" -filter_complex overlay "+
outVideoPath+"";
添加多个水印命令:
String command = "-i " + inputVideoPath +
" -i "+waterMarkPath2+" -i "+waterMarkPath+
" -filter_complex overlay=10:10,overlay=5:5 "+
outVideoPath+"";
将视频转换成小尺寸视频:
String command = "-i " + inputVideoPath +" -b:v 10000k -s 216x384 "+ outVideoPath+"";
如果碰到 App crash with error message: couldn't find "libmobileffmpeg_abidetect.so"
执行
flutter clean
flutter doctor -v
1，执行 flutter pub publish--dry-run 检查是否具备发布条件
遇到的问题1：
It‘s strongly recommended to include a “homepage“ or “repository“ field
解决方案：在 pubspec. yaml 中配置 主页 homepage 地址 :
homepage:
可参考：
2，执行 flutter pub publish--server= 发布
如果执行flutter pub publish发布的话会遇到以下错误，国内还是用 flutter pub publish--server= 来发布
package repository requested authentication! You can provide credential using:pub token add
问题1：It looks like accounts.google.com is having some trouble. Pub will wait for a while before trying to connect again. OS Error: Operation timed out, errno = 60, address = accounts.google.com, port = 53481 pub finished with exit code 69
原因：
1、国内墙；
2、flutter环境配置添加了国内镜像
解决方式：
1、翻墙；
2、屏蔽环境变量里关于flutter的国内镜像；
屏蔽方式如下：
# export PUB_HOSTED_URL=
# export FLUTTER_STORAGE_BASE_URL=
3、设置终端代理命令(这个是我解决的方式)，这个非常重要，不然就会报上面超时错误了
如果出现：Flutter pub finished with exit code 1
解决方式：flutter packages pub publish --server=
此问题原文链接：（毕竟要尊重版权）
问题2：LICENSE这个文件中不能有TODO，也不能为空，可找个flutter库看看别人是怎么写的
1、flutter Warning: Podfile is out of date
Warning: Podfile is out of date This can cause a mismatched version of Flutter to be embedded in your app, which may result in App Store submission rejection or crashes. If you have local Podfile edits you would like to keep, see for instructions. To regenerate the Podfile, run: rm iOS/Podfile
2、Automatically assigning platform iOS with version 8.0 on target Runner 或者Automatically assigning platform iOS with version 12.0 on target Runner because no platform was specified. Please specify a platform for this target in your Podfile
解决：只要修改ios目录下podfile 第二行 去掉#号
原因是：没有指定iOS版本。
3、 'AMapFoundation' uses the unencrypted 'http' protocol to transfer the Pod. Please be sure you're in a safe network with only trusted hosts. Otherwise, please reach out to the library author to notify them of this security issue.
类似的问题
解决方法：
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4、[!] An error occurred while processing the post-install hook of the Podfile.
undefined method `each_child' for #Dir:0x00007f8415636e38
Did you mean? each_slice
解决办法：升级ruby