本文主要是介绍安装snap再安装flutter再安装localsend@Ubuntu（FreeBSD下未成功），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
Localsend介绍
localsend是一个跨平台的文件传送软件，可以在Windows、MacOS、Linux、Android和IOS下互相传送文件，只要在同一个局域网即可。
localsend官网：LocalSend
尝试安装localsend，发现需要使用flutter， 安装flutter发现需要snap，于是先安装snap
ubuntu下：apt install snapd
FreeBSD下：pkg install snap （失败，FreeBSD下的软件包并不是我们需要的）
snap介绍
Snap软件包是一种新型的Linux包管理工具，它采用了容器的概念，使得每个应用程序都拥有自己独立的文件和库，从而解决了应用程序之间的依赖问题，使得应用程序更易于管理。
Snap软件包的主要特点是自包含性和跨平台性。每个Snap软件包都包含了应用程序及其所有依赖项，这意味着用户无需担心依赖关系的问题，只需安装Snap软件包即可轻松使用应用程序。此外，Snap软件包的设计也考虑了跨平台性，使得同一个Snap软件包可以在不同的Linux发行版上运行，从而提高了软件的可移植性。
是在FreeBSD使用linux兼容安装的ubuntu，刚开始使用apt install snap安装没成功，以为就不支持。后来发现要使用apt install snapd 来安装就可以了。
兼容模式下除了最后不能使用Xwindows，其它跟普通ubuntu一模一样。
在ubuntu@FreeBSD安装snap
apt install snapdFlutter介绍
Flutter 是谷歌的移动 UI 框架，可以快速在 iOS 和 Android 上构建高质量的原生用户界面。Flutter 支持跨平台、原生、开源免费，具有响应式框架、富有表现力和灵活的UI，以及跨平台自绘引擎等特点。
flutter官网文档：选择你的开发平台，开始使用 | Flutter 中文文档 - Flutter 中文开发者网站 - Flutter
用snap安装flutter
sudo snap install flutter --classic
然后配置中文地址（国内加速）：
export PUB_HOSTED_URL="https://pub.flutter-io.cn"
export FLUTTER_STORAGE_BASE_URL="https://storage.flutter-io.cn"
然后flutter doctor ，看到提示：
Telemetry is not sent on the very first run. To disable reporting of telemetry,
run this terminal command:
flutter --disable-analytics
这样就算是安装好了。但是后面碰到很多小坑，所以再详细记录一下。
安装flutter详细步骤
官方手册：在中国网络环境下使用 Flutter | Flutter 中文文档 - Flutter 中文开发者网站 - Flutter
直接到官网下载flutter tar包，解压后发现可以使用
tar -xvf flutter_linux_3.19.3-stable.tar.xz
cd flutter
./bin/flutter
在.profile文件中最后一句加入路径，这样就可以直接使用flutter命令了
PATH="$PATH:/home/linuxskywalk/tools/flutter/bin"也可以在.shrc文件中加入：
set PATH=/home/skywalk/download/flutter/bin:$PATH按照flutter手册，加入环境变量配置：
# 将 PUB_HOSTED_URL 设置为镜像站点。export PUB_HOSTED_URL="https://pub.flutter-io.cn"# 将 FLUTTER_STORAGE_BASE_URL 设置为镜像站点。export FLUTTER_STORAGE_BASE_URL="https://storage.flutter-io.cn"
如果不加，国内是无法自动下载软件的。
配置好后flutter后，开始安装localsend
编译安装localsend
下载localsend，解压缩。刚开始是从官网下载压缩文件，后来也尝试了git下载源代码：git clone https://github.com/localsend/localsend
然后到localsend/app 目录（~/tools/localsend-1.14.0/app），执行：
flutter build linux
如果没有报错，就算成了！
但是有报错，详见调试部分，开始一步步解决报错问题。。
首先：
使用flutter doctor查找问题
发现linux部分有3个问题，按照提示安装三个软件包：
执行
sudo apt install libgtk-3-dev clang ninja-build 后面build还有报错，根据提示安装下面两个库，解决build问题：
sudo apt install libappindicator3-1 libappindicator3-dev还有报错需要修改文件：
修改pubspec.yaml文件
参考：https://github.com/fluttercandies/flutter_photo_manager/issues/1021
Adding this to pubspec.yaml worked as temporary fix, ty @den0206
dependency_overrides: photo_manager: ^3.0.0-dev.2
当前还存在的问题：
flutter build linux 之后报错，见最后一个调试问题。
目前没有解决。
=====================================
解决问题的分界线
后来才明白，原来pubspec.yaml文件那里少修改了一个地方，
还需要修改这里：
dependencies:wechat_assets_picker: ^8.9.0-dev.1修改之后，再run，有报错：
(localsend_app:253856): Gtk-WARNING **: 11:39:19.837: cannot open display
这其实证明基本已经成功了。只是没有窗体报错罢了。
进入xwindows窗口，再执行flutter run ,哇，localsend 终于成功运行了！
android版本，直接下载：https://github.com/localsend/localsend/releases/download/v1.14.0/LocalSend-1.14.0.apk
windows版本，直接下载：https://github.com/localsend/localsend/releases/download/v1.14.0/LocalSend-1.14.0-windows-x86-64.exe
总结：
localsend是一个非常不错的文件传送软件，只是在linux安装的时候，需要修改少量代码，增加了一定难度。
调试
编译flutter报错
flutter build linux
Resolving dependencies... (1:42.1s)
Git error. Command: `git clone --mirror https://github.com/Tienisto/tray_manager.git /home/linuxskywalk/.pub-cache/git/cache/tray_manager-ad808f1c5d07229907508d5b7c74bd2e20923421`
stdout:
stderr: Cloning into bare repository '/home/linuxskywalk/.pub-cache/git/cache/tray_manager-ad808f1c5d07229907508d5b7c74bd2e20923421'...
fatal: unable to access 'https://github.com/Tienisto/tray_manager.git/': Failed to connect to github.com port 443: Connection timed out
exit code: 128
换用国内镜像
flutter doctor报错
[✗] Linux toolchain - develop for Linux desktop
✗ clang++ is required for Linux development.
It is likely available from your distribution (e.g.: apt install clang), or
can be downloaded from https://releases.llvm.org/
✗ ninja is required for Linux development.
It is likely available from your distribution (e.g.: apt install
ninja-build), or can be downloaded from
https://github.com/ninja-build/ninja/releases
✗ GTK 3.0 development libraries are required for Linux development.
They are likely available from your distribution (e.g.: apt install
libgtk-3-dev)
根据linux部分的报错，
执行：sudo apt install libgtk-3-dev clang ninja-build
flutter build报错 because localsend_app depends on path 1.8.3,
$ flutter build linux
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you
trust this source!
Resolving dependencies... (3.8s)
Note: path is pinned to version 1.9.0 by flutter_localizations from the flutter SDK.
See https://dart.dev/go/sdk-version-pinning for details.
Because localsend_app depends on flutter_localizations from sdk which depends on
path 1.9.0, path 1.9.0 is required.
So, because localsend_app depends on path 1.8.3, version solving failed.
You can try the following suggestion to make the pubspec resolve:
* Try upgrading your constraint on path: flutter pub add path:^1.9.0
按照提示执行：flutter pub add path:^1.9.0
这里失误了，应该是：flutter pub add path:^1.8.3
新报错The `system_tray` package requires ayatana-appindicator3-0.1 or appindicator3-0.1.
$ flutter build linux
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you
trust this source!
CMake Error at flutter/ephemeral/.plugin_symlinks/system_tray/linux/CMakeLists.txt:29 (message):
The `system_tray` package requires ayatana-appindicator3-0.1 or
appindicator3-0.1.
Building Linux application...
Adding this to pubspec.yaml worked as temporary fix, ty @den0206
解决问题方法，执行：sudo apt install libappindicator3-1 libappindicator3-dev
报错：Error: Type 'DecoderCallback' not found.
flutter build linux
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you
trust this source!
ERROR: ../../../.pub-cache/hosted/pub.flutter-io.cn/photo_manager-2.8.1/lib/src/internal/image_provider.dart:71:5: Error: Type 'DecoderCallback' not found.
ERROR: DecoderCallback decode, // ignore: deprecated_member_use
ERROR: ^^^^^^^^^^^^^^^
ERROR: ../../../.pub-cache/hosted/pub.flutter-io.cn/photo_manager-2.8.1/lib/src/internal/image_provider.dart:96:5: Error: Type 'DecoderCallback' not found.
ERROR: DecoderCallback decode, // ignore: deprecated_member_use
ERROR: ^^^^^^^^^^^^^^^
ERROR: ../../../.pub-cache/hosted/pub.flutter-io.cn/photo_manager-2.8.1/lib/src/internal/image_provider.dart:71:5: Error: 'DecoderCallback' isn't a type.
ERROR: DecoderCallback decode, // ignore: deprecated_member_use
ERROR: ^^^^^^^^^^^^^^^
ERROR: ../../../.pub-cache/hosted/pub.flutter-io.cn/photo_manager-2.8.1/lib/src/internal/image_provider.dart:96:5: Error: 'DecoderCallback' isn't a type.
ERROR: DecoderCallback decode, // ignore: deprecated_member_use
ERROR: ^^^^^^^^^^^^^^^
ERROR: Target kernel_snapshot failed: Exception
Building Linux application...
Build process failed
解决了这个问题，参见issue：About DecoderCallback cannot found error( Type 'DecoderCallback' not found.) · Issue #1021 · fluttercandies/flutter_photo_manager · GitHub
Adding this to pubspec.yaml worked as temporary fix, ty @den0206
dependency_overrides: photo_manager: ^3.0.0-dev.2
重新在另一台机器做实验，发现报错： localsend_app depends on path 1.8.3,
flutter build linux
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure
you trust this source!
Resolving dependencies... (12.7s)
Note: path is pinned to version 1.9.0 by flutter_localizations from the flutter SDK.
See https://dart.dev/go/sdk-version-pinning for details.
Because localsend_app depends on flutter_localizations from sdk which depends
on path 1.9.0, path 1.9.0 is required.
So, because localsend_app depends on path 1.8.3, version solving failed.
尝试执行：flutter pub add path:^1.8.3
解决问题
报错：Error: Type 'AssetEntityImageProvider' not found.
原来是pubspec.yaml文件少修改了一个地方。
dependencies:wechat_assets_picker: ^8.9.0-dev.1报错： cannot open display:
EXTERNAL_USB/tools/localsend/app$ flutter run
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure
you trust this source!
Launching lib/main.dart on Linux in debug mode...
Building Linux application...
(localsend_app:253856): Gtk-WARNING **: 11:39:19.837: cannot open display:
Error waiting for a debug connection: The log reader stopped unexpectedly, or
never started.
Error launching application on Linux.
因为是ssh登录的，所以有这个报错。到xwindows下执行，问题解决。
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