深海游弋的鱼 – 第 50 页 – 智障儿童欢乐多

解决GitHub的raw.githubusercontent.com无法连接问题

https://site.ip138.com/raw.Githubusercontent.com/

输入raw.githubusercontent.com

查询IP地址

修改hosts Ubuntu，CentOS及macOS直接在终端输入

$ sudo vi /etc/hosts

1	$ sudo vi /etc/hosts

添加以下内容保存即可（IP地址查询后相应修改，可以ping不同IP的延时选择最佳IP地址）

# GitHub Start
52.74.223.119 github.com
192.30.253.119 gist.github.com
54.169.195.247 api.github.com
185.199.111.153 assets-cdn.github.com
199.232.96.133 raw.githubusercontent.com
#151.101.76.133 raw.githubusercontent.com
151.101.108.133 user-images.githubusercontent.com
151.101.76.133 gist.githubusercontent.com
151.101.76.133 cloud.githubusercontent.com
151.101.76.133 camo.githubusercontent.com
151.101.76.133 avatars0.githubusercontent.com
151.101.76.133 avatars1.githubusercontent.com
151.101.76.133 avatars2.githubusercontent.com
151.101.76.133 avatars3.githubusercontent.com
151.101.76.133 avatars4.githubusercontent.com
151.101.76.133 avatars5.githubusercontent.com
151.101.76.133 avatars6.githubusercontent.com
151.101.76.133 avatars7.githubusercontent.com
151.101.76.133 avatars8.githubusercontent.com
# GitHub End

参考链接

ubuntu 20.04 & ubuntu18.04快速开启TCP BBR实现高效单边加速

Linux Kernel 内核升级到 4.9 及以上版本可以实现 BBR 加速，由于Ubuntu 18.04 默认的内核就是 4.15版本的内核，由于Ubuntu 20.04 默认的内核就是 5.4 版本的内核，并已经默认编译了 TCP BBR 模块，所以可以直接通过参数开启。

新的 TCP 拥塞控制算法 BBR (Bottleneck Bandwidth and RTT) 可以让服务器的带宽尽量跑慢，并且尽量不要有排队的情况，让网络服务更佳稳定和高效。

修改系统变量：

$ echo 'net.core.default_qdisc=fq' | sudo tee -a /etc/sysctl.conf 

$ echo 'net.ipv4.tcp_congestion_control=bbr' | sudo tee -a /etc/sysctl.conf

$ echo 'net.core.default_qdisc=fq' | sudo tee -a /etc/sysctl.conf

$ echo 'net.ipv4.tcp_congestion_control=bbr' | sudo tee -a /etc/sysctl.conf

保存生效

$ sudo sysctl -p

1	$ sudo sysctl -p

执行

$ sysctl net.ipv4.tcp_available_congestion_control

1	$ sysctl net.ipv4.tcp_available_congestion_control

如果结果是这样

$ sysctl net.ipv4.tcp_available_congestion_control 
net.ipv4.tcp_available_congestion_control = bbr cubic reno

1 2	$ sysctl net.ipv4.tcp_available_congestion_control net.ipv4.tcp_available_congestion_control = bbr cubic reno

就开启了。执行 lsmod | grep bbr ，以检测 BBR 是否开启。

一般建议重启系统，重启后执行

$ sysctl net.ipv4.tcp_congestion_control 
net.ipv4.tcp_congestion_control = bbr

1 2	$ sysctl net.ipv4.tcp_congestion_control net.ipv4.tcp_congestion_control = bbr

参考链接

【解决】Unable to locate adb

环境：Android Studio 4.0 打开虚拟设备时，弹出“Unable to locate adb”，如下图：

继续阅读【解决】Unable to locate adb

Flutter Flare(Rive)动画

Flare(Rive)是一家可以快速制Flutter SVG动画的网站，提供专门的Flutter Weight承载网站导出的动画文件，相当于Android的Lottie，Flare的首次出现非常惊艳，是在Flutter发布大会上，一下就火了。

继续阅读Flutter Flare(Rive)动画

flutter动态申请权限

https://pub.flutter-io.cn/packages/permission_handler

https://www.jianshu.com/p/fa68876fbdfd

例

  Future requestPermission() async {
    // 申请权限
    Map<PermissionGroup, PermissionStatus> permissions =
        await PermissionHandler().requestPermissions([PermissionGroup.storage]);

    // 申请结果
    PermissionStatus permission = await PermissionHandler()
        .checkPermissionStatus(PermissionGroup.storage);

    if (permission == PermissionStatus.granted) {
      print("权限申请通过");
    } else {
      print("权限申请通过");
    }
  }
}

Future requestPermission() async {

// 申请权限

Map<PermissionGroup, PermissionStatus> permissions =

await PermissionHandler().requestPermissions([PermissionGroup.storage]);

// 申请结果

PermissionStatus permission = await PermissionHandler()

.checkPermissionStatus(PermissionGroup.storage);

if (permission == PermissionStatus.granted) {

print("权限申请通过");

} else {

print("权限申请通过");

}

参考链接

flutter 动态申请权限

Flutter 1.22最新的多国语支持配置和使用

Flutter 1.22现已发布

最新版本中，随之发布了很多新的特性以及修复了一些BUG，现在我们说说其中的新的多国语插件。个人感觉新多国语操作，多了一些模板性的东西，但是也方便了很多东西。

话不多说，现在我们进入正题，如何使用新插件呢？

配置项目的yaml文件

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations: #配置多国语支持
    sdk: flutter
  intl: ^0.16.1   #多国语插件,要求高于0.16.1版本
  
  
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  generate: true  #新增配置，自动多国语代码生成

dependencies:

flutter:

sdk: flutter

flutter_localizations: #配置多国语支持

sdk: flutter

intl: ^0.16.1 #多国语插件,要求高于0.16.1版本

flutter:

# The following line ensures that the Material Icons font is

# included with your application, so that you can use the icons in

# the material Icons class.

uses-material-design: true

generate: true #新增配置，自动多国语代码生成

继续阅读Flutter 1.22最新的多国语支持配置和使用

AAPT: error: resource android:attr/fontVariationSettings not found

最近在编译Flutter项目的时候，报错如下：

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:processDebugResources'.
> Android resource linking failed
  Output:  /Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:86: error: resource android:attr/fontVariationSettings not found.
  /Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:87: error: resource android:attr/ttcIndex not found.
  error: failed linking references.

  Command: /Users/xxxx/.gradle/caches/transforms-1/files-1.1/aapt2-3.2.1-4818971-osx.jar/ace5a2b7765511437e6add51febae423/aapt2-3.2.1-4818971-osx/aapt2 link -I\
          /Users/xxxx/Library/Android/sdk/platforms/android-27/android.jar\
          --manifest\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/merged_manifests/debug/processDebugManifest/merged/AndroidManifest.xml\
          -o\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/processed_res/debug/processDebugResources/out/resources-debug.ap_\
          -R\
          @/Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/processDebugResources/resources-list-for-resources-debug.ap_.txt\
          --auto-add-overlay\
          --java\
          /Users/xxxx/Source/developer_quest/build/app/generated/not_namespaced_r_class_sources/debug/processDebugResources/r\
          --custom-package\
          dev.flutter.devrpg\
          -0\
          apk\
          --output-text-symbols\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/symbols/debug/R.txt\
          --no-version-vectors
  Daemon:  AAPT2 aapt2-3.2.1-4818971-osx Daemon #0
  Output:  /Users/xxxx/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/becc1f5b1538f3fe61f1f959fb2bd672/res/values/values.xml:174:5-210:25: AAPT: error: resource android:attr/fontVariationSettings not found.

  /Users/xxxx/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/becc1f5b1538f3fe61f1f959fb2bd672/res/values/values.xml:174:5-210:25: AAPT: error: resource android:attr/ttcIndex not found.

  error: failed linking references.
  Command: /Users/xxxx/.gradle/caches/transforms-1/files-1.1/aapt2-3.2.1-4818971-osx.jar/ace5a2b7765511437e6add51febae423/aapt2-3.2.1-4818971-osx/aapt2 link -I\
          /Users/xxxx/Library/Android/sdk/platforms/android-27/android.jar\
          --manifest\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/merged_manifests/debug/processDebugManifest/merged/AndroidManifest.xml\
          -o\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/processed_res/debug/processDebugResources/out/resources-debug.ap_\
          -R\
          @/Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/processDebugResources/resources-list-for-resources-debug.ap_.txt\
          --auto-add-overlay\
          --java\
          /Users/xxxx/Source/developer_quest/build/app/generated/not_namespaced_r_class_sources/debug/processDebugResources/r\
          --custom-package\
          dev.flutter.devrpg\
          -0\
          apk\
          --output-text-symbols\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/symbols/debug/R.txt\
          --no-version-vectors
  Daemon:  AAPT2 aapt2-3.2.1-4818971-osx Daemon #0

* 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 13s
Exception: Gradle task assembleDebug failed with exit code 1

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':app:processDebugResources'.

> Android resource linking failed

Output: /Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:86: error: resource android:attr/fontVariationSettings not found.

/Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:87: error: resource android:attr/ttcIndex not found.

error: failed linking references.

Command: /Users/xxxx/.gradle/caches/transforms-1/files-1.1/aapt2-3.2.1-4818971-osx.jar/ace5a2b7765511437e6add51febae423/aapt2-3.2.1-4818971-osx/aapt2 link -I\

/Users/xxxx/Library/Android/sdk/platforms/android-27/android.jar\

--manifest\

/Users/xxxx/Source/developer_quest/build/app/intermediates/merged_manifests/debug/processDebugManifest/merged/AndroidManifest.xml\

-o\

/Users/xxxx/Source/developer_quest/build/app/intermediates/processed_res/debug/processDebugResources/out/resources-debug.ap_\

-R\

@/Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/processDebugResources/resources-list-for-resources-debug.ap_.txt\

--auto-add-overlay\

--java\

/Users/xxxx/Source/developer_quest/build/app/generated/not_namespaced_r_class_sources/debug/processDebugResources/r\

--custom-package\

dev.flutter.devrpg\

-0\

apk\

--output-text-symbols\

/Users/xxxx/Source/developer_quest/build/app/intermediates/symbols/debug/R.txt\

--no-version-vectors

Daemon: AAPT2 aapt2-3.2.1-4818971-osx Daemon #0

Output: /Users/xxxx/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/becc1f5b1538f3fe61f1f959fb2bd672/res/values/values.xml:174:5-210:25: AAPT: error: resource android:attr/fontVariationSettings not found.

/Users/xxxx/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/becc1f5b1538f3fe61f1f959fb2bd672/res/values/values.xml:174:5-210:25: AAPT: error: resource android:attr/ttcIndex not found.

error: failed linking references.

Command: /Users/xxxx/.gradle/caches/transforms-1/files-1.1/aapt2-3.2.1-4818971-osx.jar/ace5a2b7765511437e6add51febae423/aapt2-3.2.1-4818971-osx/aapt2 link -I\

/Users/xxxx/Library/Android/sdk/platforms/android-27/android.jar\

--manifest\

/Users/xxxx/Source/developer_quest/build/app/intermediates/merged_manifests/debug/processDebugManifest/merged/AndroidManifest.xml\

-o\

/Users/xxxx/Source/developer_quest/build/app/intermediates/processed_res/debug/processDebugResources/out/resources-debug.ap_\

-R\

@/Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/processDebugResources/resources-list-for-resources-debug.ap_.txt\

--auto-add-overlay\

--java\

/Users/xxxx/Source/developer_quest/build/app/generated/not_namespaced_r_class_sources/debug/processDebugResources/r\

--custom-package\

dev.flutter.devrpg\

-0\

apk\

--output-text-symbols\

/Users/xxxx/Source/developer_quest/build/app/intermediates/symbols/debug/R.txt\

--no-version-vectors

Daemon: AAPT2 aapt2-3.2.1-4818971-osx Daemon #0

* 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 13s

Exception: Gradle task assembleDebug failed with exit code 1

解决方案：

try to change the compileSdkVersion above 27:

compileSdkVersion 28

参考链接

resource android:attr/fontVariationSettings not found

WOL网络唤醒在微星主板上开启(ubuntu 20.04/Windows 10双系统)

网络唤醒

微星H97I-AC的板子开启WOL网络唤醒

主板：微星 H97I-AC，集成 Realtek 千兆网卡,这个网卡自带网络唤醒功能，但是需要在操作系统中通过驱动开启这个功能，BIOS中无法直接开启。
操作系统：Windows 10/ubuntu 20.04双系统，双系统都需要进行配置，才能实现全部系统关机之后都能正常唤醒。

BIOS 设置

高级–整合周边设备–网卡ROM启动，设置为允许
高级–电源管理设置–Eup 2013，设置为禁止
高级–唤醒事件设置–PCIE设备唤醒，设置为允许

Windows 10 设置

控制面板–所有控制面板项–网络连接
在网卡适配器点击鼠标右键–属性，弹出的属性对话框中
选择网络选项卡–配置
选择高级选项卡，将关机网络唤醒设置为开启，将魔术封包唤醒设置为开启
电源管理选项卡，勾选下面三个选项，允许此设备唤醒计算机。

ubuntu 20.04设置

$ sudo apt-get install ethtool

$ sudo apt-get install vim

$ sudo vim /etc/systemd/system/wol.service

$ sudo apt-get install ethtool

$ sudo apt-get install vim

$ sudo vim /etc/systemd/system/wol.service

里面的内容如下：

[Unit]
Description=Configure Wake On LAN

[Service]
Type=oneshot
ExecStart=/sbin/ethtool -s eth0 wol g

# 如果有多张网卡
# ExecStart=/bin/bash -c '/sbin/ethtool -s enp5s0 wol g && /sbin/ethtool -s eth0 wol g'


[Install]
WantedBy=basic.target

[Unit]

Description=Configure Wake On LAN

[Service]

Type=oneshot

ExecStart=/sbin/ethtool -s eth0 wol g

# 如果有多张网卡

# ExecStart=/bin/bash -c '/sbin/ethtool -s enp5s0 wol g && /sbin/ethtool -s eth0 wol g'

[Install]

WantedBy=basic.target

上述配置是向驱动发送控制命令，启用网络唤醒功能。

启用服务

$ sudo systemctl daemon-reload

$ sudo systemctl enable wol.service

$ sudo systemctl start wol.service

$ sudo systemctl daemon-reload

$ sudo systemctl enable wol.service

$ sudo systemctl start wol.service

远程唤醒

$ sudo apt-get install wakeonlan -y

$ wakeonlan MAC

$ sudo apt-get install wakeonlan -y

$ wakeonlan MAC

也可尝试 etherwake

$ sudo apt-get install etherwake -y

$ etherwake MAC

# OpenWrt
# opkg install etherwake
# /usr/bin/etherwake -i br-lan MAC

$ sudo apt-get install etherwake -y

$ etherwake MAC

# OpenWrt

# opkg install etherwake

# /usr/bin/etherwake -i br-lan MAC

参考链接

Error: Your CLT does not support macOS 11.0.

最近系统升级到macOS Big Sur(11.0.1)之后，系统报告如下错误：

$ brew upgrade

...........................................

==> Upgrading 5 outdated packages:
tomcat 9.0.39 -> 9.0.40
gradle 6.7 -> 6.7.1
opencv 4.5.0_3 -> 4.5.0_4
vtk 9.0.1_1 -> 9.0.1_2
imagemagick 7.0.10-38 -> 7.0.10-39
==> Upgrading tomcat 9.0.39 -> 9.0.40 
==> Downloading https://www.apache.org/dyn/closer.lua?path=tomcat/tomcat-9/v9.0.
==> Downloading from https://mirror.bit.edu.cn/apache/tomcat/tomcat-9/v9.0.40/bi
######################################################################## 100.0%
Error: Your CLT does not support macOS 11.0.
It is either outdated or was modified.
Please update your CLT or delete it if no updates are available.
Error: An exception occurred within a child process:
  SystemExit: exit

$ brew upgrade

...........................................

==> Upgrading 5 outdated packages:

tomcat 9.0.39 -> 9.0.40

gradle 6.7 -> 6.7.1

opencv 4.5.0_3 -> 4.5.0_4

vtk 9.0.1_1 -> 9.0.1_2

imagemagick 7.0.10-38 -> 7.0.10-39

==> Upgrading tomcat 9.0.39 -> 9.0.40

==> Downloading https://www.apache.org/dyn/closer.lua?path=tomcat/tomcat-9/v9.0.

==> Downloading from https://mirror.bit.edu.cn/apache/tomcat/tomcat-9/v9.0.40/bi

######################################################################## 100.0%

Error: Your CLT does not support macOS 11.0.

It is either outdated or was modified.

Please update your CLT or delete it if no updates are available.

Error: An exception occurred within a child process:

SystemExit: exit

解决方案如下：

$ sudo rm -rf /Library/Developer/CommandLineTools

$ sudo xcode-select --install

$ sudo rm -rf /Library/Developer/CommandLineTools

$ sudo xcode-select --install

参考链接

ubuntu 20.04将Python3交叉编译移植到Android平台

最近想在Android环境中集成Python3，参考了一下网上的实现，发现已经有项目实现这个功能的，具体的编译过程参考下面：

$ sudo apt-get install make

# makeinfo工具，包编译时候需要
$ sudo apt-get install texinfo 
 
$ sudo apt-get install git

$ sudo apt-get install aria2

$ cd ~

$ aria2c -c https://dl.google.com/android/repository/android-ndk-r21b-linux-x86_64.zip

$ unzip android-ndk-r21b-linux-x86_64.zip

# 安装pyenv，配置python 3.6.6 编译的是这个版本，需要安装这个版本的python,其他版本的Python编译会失败
$ git clone https://github.com/pyenv/pyenv.git

$ cd pyenv

$ make

$ cd bin

$ sudo apt-get install openssl

$ sudo apt-get install libssl-dev

$ sudo apt-get install libbz2-dev

$ sudo apt-get install libreadline-dev

$ sudo apt-get install sqlite3

$ sudo apt-get install libsqlite3-dev

# for scikit-learn
$ sudo apt-get install python-numpy

$ sudo pip2 install --upgrade pip

$ sudo apt-get install cython

$ ./pyenv install 3.6.6

# 全局设置版本 
$ ./pyenv global 3.6.6

$ eval "$(./pyenv init -)" 

$ cd ~

$ git clone https://github.com/qpython-android/qpython3-toolchain.git

$ cd qpython3-toolchain

$ sed -i 's/PYTHON?=python/PYTHON?=python3/g' Makefile

$ export ANDROID_NDK=~/android-ndk-r21b

# for python2
$ export CLANG_FLAGS_BASE=

# for pycryptodome
$ export PY_BRANCH=3

$ export PY_M_BRANCH=6m

# 目标编译代码为 aarch64
$ export TARGET_ARCH_ANDROID=aarch64

$ export TARGET_ARCH_NAME=android

$ export ANDROID_VER=29

$ make clean

$ make

# 目前 scikit-learn 部分还是编译不通过

$ sudo apt-get install make

# makeinfo工具，包编译时候需要

$ sudo apt-get install texinfo

$ sudo apt-get install git

$ sudo apt-get install aria2

$ cd ~

$ aria2c -c https://dl.google.com/android/repository/android-ndk-r21b-linux-x86_64.zip

$ unzip android-ndk-r21b-linux-x86_64.zip

# 安装pyenv，配置python 3.6.6 编译的是这个版本，需要安装这个版本的python,其他版本的Python编译会失败

$ git clone https://github.com/pyenv/pyenv.git

$ cd pyenv

$ make

$ cd bin

$ sudo apt-get install openssl

$ sudo apt-get install libssl-dev

$ sudo apt-get install libbz2-dev

$ sudo apt-get install libreadline-dev

$ sudo apt-get install sqlite3

$ sudo apt-get install libsqlite3-dev

# for scikit-learn

$ sudo apt-get install python-numpy

$ sudo pip2 install --upgrade pip

$ sudo apt-get install cython

$ ./pyenv install 3.6.6

# 全局设置版本

$ ./pyenv global 3.6.6

$ eval "$(./pyenv init -)"

$ cd ~

$ git clone https://github.com/qpython-android/qpython3-toolchain.git

$ cd qpython3-toolchain

$ sed -i 's/PYTHON?=python/PYTHON?=python3/g' Makefile

$ export ANDROID_NDK=~/android-ndk-r21b

# for python2

$ export CLANG_FLAGS_BASE=

# for pycryptodome

$ export PY_BRANCH=3

$ export PY_M_BRANCH=6m

# 目标编译代码为 aarch64

$ export TARGET_ARCH_ANDROID=aarch64

$ export TARGET_ARCH_NAME=android

$ export ANDROID_VER=29

$ make clean

$ make

# 目前 scikit-learn 部分还是编译不通过

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