Android源代码下载与编译 - 2019 （基于Ubuntu 18.10，适用于国内环境）
下载repo工具
如果没有下载repo脚本工具，请到清华mirror下载
curl https://mirrors.tuna.tsinghua.edu.cn/git/git-repo -o repo
chmod +x repo然后设置更新源：
export REPO_URL='https://mirrors.tuna.tsinghua.edu.cn/git/git-repo/'下载Android
因为Android的源码越来越大，repo sync失败的概率也越来越高。
所以我们可以避开使用repo sync的方式，而采用下载预下载包的方式来实现：
wget -c https://mirrors.tuna.tsinghua.edu.cn/aosp-monthly/aosp-latest.tar # 下载初始化包
tar xf aosp-latest.tar
cd AOSP # 解压得到的 AOSP 工程目录
repo sync # 正常同步一遍即可得到完整目录下载厂商代码
例，我们用hikey960的代码：
wget https://dl.google.com/dl/android/aosp/hisilicon-hikey960-OPR-3c243263.tgz
tar xf hisilicon-hikey960-OPR-3c243263.tgz解压之后会生成extract-hisilicon-hikey960.sh，运行这个文件：
./extract-hisilicon-hikey960.sh接受协议输入I ACCEPT，然后就可以顺利解压运行。
会解压出下面的一些文件和目录：
vendor/
vendor/linaro/
vendor/linaro/hikey960/
vendor/linaro/hikey960/hisilicon/
vendor/linaro/hikey960/hisilicon/device-partial.mk
vendor/linaro/hikey960/hisilicon/BoardConfigPartial.mk
vendor/linaro/hikey960/hisilicon/proprietary/
vendor/linaro/hikey960/hisilicon/proprietary/libOMX.hisi.vdec.core.so
vendor/linaro/hikey960/hisilicon/proprietary/libc_secshared.so
vendor/linaro/hikey960/hisilicon/proprietary/libhilog.so
vendor/linaro/hikey960/hisilicon/proprietary/libOMX_Core.so
vendor/linaro/hikey960/hisilicon/proprietary/lib64/
vendor/linaro/hikey960/hisilicon/proprietary/lib64/libOMX.hisi.vdec.core.so
vendor/linaro/hikey960/hisilicon/proprietary/lib64/libc_secshared.so
vendor/linaro/hikey960/hisilicon/proprietary/lib64/libhilog.so
vendor/linaro/hikey960/hisilicon/proprietary/lib64/libOMX_Core.so
vendor/linaro/hikey960/hisilicon/proprietary/lib64/libstagefrighthw.so
vendor/linaro/hikey960/hisilicon/proprietary/lib64/libhiion.so
vendor/linaro/hikey960/hisilicon/proprietary/lib64/libOMX.hisi.video.decoder.so
vendor/linaro/hikey960/hisilicon/proprietary/libstagefrighthw.so
vendor/linaro/hikey960/hisilicon/proprietary/libhiion.so
vendor/linaro/hikey960/hisilicon/proprietary/libOMX.hisi.video.decoder.so
vendor/linaro/hikey960/device-vendor.mk
vendor/linaro/hikey960/BoardConfigVendor.mk配置编译环境
其它基本上开发环境上大家都会配，就不多说了。
在Ubuntu 18.10上需要注意的是，ncurses默认安装的是版本6，而2019年3月的Android版本仍然需要ncurses5.
例：
sudo apt install libncurses5-dev编译
我们仍以Android目前（2019年3月）推荐的hikey960硬件为目标，编译命令如下：
. ./build/envsetup.sh
lunch hikey960-userdebug
make -j32大功告成！