搭建android开发环境，首先需要下载google的aosp包，以及开发板的vendor开发包。
在khadas项目中，分别是从tsinghua镜像源和github上同步的。所以要修改manifest清单的fetch地址，告诉repo从哪抓取。
https://mirrors.tuna.tsinghua.edu.cn/help/AOSP/
https://docs.khadas.com/vim3/DownloadAndroidSourceCode.html
### 下载repo索引工具 ###
chase@giga:~$ curl https://mirrors.tuna.tsinghua.edu.cn/git/git-repo -o repo
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 29829 100 29829 0 0 21185 0 0:00:01 0:00:01 --:--:-- 21170
chase@giga:~$ chmod a+rx repo
chase@giga:~$ vi repo
### REPO_URL 替换成国内源 'https://mirrors.tuna.tsinghua.edu.cn/git/git-repo' ###
chase@giga:~$ vi .bashrc
### 永久环境变量 最后一行添加 export PATH=$PATH:~/ 将当前路径加入PATH###
### 刷新立即生效 ###
chase@giga:~$ source .bashrc
chase@giga:~$ echo $PATH
/home/chase/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/chase/
### 从开发板指定地址下载manifest清单以及repo工具, 都在.repo目录下###
chase@giga:~$ cd ~/projects/khadas-vims-pie/
chase@giga:~/projects/khadas-vims-pie$ repo init -u https://github.com/khadas/android_manifest.git -b khadas-vims-pie
Get https://gerrit-googlesource.proxy.ustclug.org/git-repo/clone.bundle
Get https://gerrit-googlesource.proxy.ustclug.org/git-repo
Get https://github.com/khadas/android_manifest.git
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- 0:00:01 --:--:-- 0
curl: (22) The requested URL returned error: 404 Not Found
Server does not provide clone.bundle; ignoring.
remote: Enumerating objects: 9, done.
remote: Counting objects: 100% (9/9), done.
remote: Compressing objects: 100% (5/5), done.
remote: Total 201 (delta 2), reused 7 (delta 1), pack-reused 192
Receiving objects: 100% (201/201), 253.52 KiB | 377.00 KiB/s, done.
Resolving deltas: 100% (63/63), done.
From https://github.com/khadas/android_manifest
* [new tag] V180622 -> V180622
* [new branch] Mmallow -> origin/Mmallow
* [new branch] Nougat -> origin/Nougat
* [new branch] Oreo -> origin/Oreo
* [new branch] khadas-edge-nougat -> origin/khadas-edge-nougat
* [new branch] khadas-edge-pie -> origin/khadas-edge-pie
* [new branch] khadas-vim3-pie -> origin/khadas-vim3-pie
* [new branch] khadas-vims-nougat -> origin/khadas-vims-nougat
* [new branch] khadas-vims-pie -> origin/khadas-vims-pie
* [new branch] master -> origin/master
* [new branch] test -> origin/test
Your identity is: chase <xxxxxx@hotmail.com>
If you want to change this, please re-run 'repo init' with --config-name
repo has been initialized in /home/chase/projects/khadas-vims-pie
###这时会在文件夹下出现一个.repo的隐藏文件夹###
chase@giga:~/projects/khadas-vims-pie$ ls .repo
manifests manifests.git manifest.xml repo
chase@giga:~/projects/khadas-vims-pie$ cd .repo/manifests
chase@giga:~/projects/khadas-vims-pie/.repo/manifests$ vi default.xml
### remote中的fetch和review都替换成国内镜像源 https://aosp.tuna.tsinghua.edu.cn ###
### 可以查看下远程服务器的分支版本 ###
chase@giga:~/projects/khadas-vims-pie/.repo/manifests$ git branch -av
* default 17f19da Pie: V200103
remotes/origin/Mmallow 856410c update download link of svox repository to google
remotes/origin/Nougat 2f08215 Set function key adc value for VIM2 different versions
remotes/origin/Oreo b75302d fixup! Oreo: V171229
remotes/origin/khadas-edge-nougat 402b195 update to Edge_Nougat_V191115
remotes/origin/khadas-edge-pie 16f0d2b Fix compile error
remotes/origin/khadas-vim3-pie 33144e9 fixup! Pie: V190823
remotes/origin/khadas-vims-nougat 2f08215 Set function key adc value for VIM2 different versions
remotes/origin/khadas-vims-pie 17f19da Pie: V200103
remotes/origin/master f351208 fixup! update: V161211
remotes/origin/test 3142359 fixup! Pie: V190704
### 从服务器同步aosp和vendor源码, -j表示并行下载的git包数量 ###
chase@giga:~/projects/khadas-vims-pie$ repo sync -j4
......
Checking out projects: 100% (687/687), done.
###所有git包都在.repo/project-objects里面，大约有100G###
chase@giga:~/projects/khadas-vims-pie$ ls .repo/
manifests manifest.xml project-objects repo
manifests.git project.list projects
###sync到每个.git包后，会同步提取到khadas-vims-pie目录下###
### 建立新分支 ###
chase@giga:~/projects/khadas-vims-pie$ repo start khadas-vims-pie --all
### 逐步编译参考 ###
https://docs.khadas.com/zh-cn/vim3/BuildAndroid.html
***---***---***---***---***
### 一般编译出错都是文件丢失导致的，查找删除或者手动删除 ###
chase@giga:~/projects/khadas-vims-pie$ repo start khadas-vims-pie --all
error: device/khadas/: cannot start khadas-vims-pie
### find并删除 源端版本android_device_khadas.git 本地版本device/khadas.git
chase@giga:~/projects/khadas-vims-pie$ find .repo/ -iname "*khadas.git"
.repo/project-objects/android_device_khadas.git
.repo/projects/device/khadas.git
chase@giga:~/projects/khadas-vims-pie$ rm -rf .repo/project-objects/android_device_khadas.git .repo/projects/device/khadas.git
chase@giga:~/projects/khadas-vims-pie$
### 再单独sync这个包 ###
chase@giga:~/projects/khadas-vims-pie$ repo sync -c device/khadas/
### 有时发现.git包是完整的，但是check out会丢失文件 ###
### 可以用git clone单独下载这个包，然后copy到项目中 ###
chase@giga:~/projects$ git clone https://github.com/khadas/android_device_khadas.git/ -b khadas-vims-pie