Compile environment to build

Ready to compile

Compiling Android requires high machine configuration:

64-bit CPU

16GB physical memory + swap memory

30GB of free disk space is used for construction, and the source tree
takes up about 25GBs

The official recommendation is the Ubuntu 14.04 operating system.
After testing, Ubuntu 12.04 can also be compiled and run successfully,
as long as the software and hardware configurations in the suffice are
met.

http://source.android.com/source/building.html

The initialization of the compilation environment can refer to

http://source.android.com/source/initializing.html

 。

Install OpenJDK 7:

   sudo apt-get install openjdk-7-jdk

Tip: Installing openjdk-7-jdk will change the default link of the JDK,
available at this time:

   sudo update-alternatives --config java
   sudo update-alternatives --config javac

To switch the JDK version. When the SDK cannot find the default JDK of
the operating system, it will use the internal JDK path. Therefore, in
order to allow the same machine to compile Android 5.1 and previous
versions, it is more convenient to remove the link:

   sudo /var/lib/dpkg/info/openjdk-7-jdk:amd64.prerm remove

Ubuntu 12.04 软件包安装:

   sudo apt-get install git gnupg flex bison gperf build-essential \
   zip curl libc6-dev libncurses5-dev:i386 x11proto-core-dev \
   libx11-dev:i386 libreadline6-dev:i386 libgl1-mesa-glx:i386 \
   g++-multilib mingw32 tofrodos gcc-multilib ia32-libs \
   python-markdown libxml2-utils xsltproc zlib1g-dev:i386 \
   lzop libssl1.0.0 libssl-dev

Ubuntu 14.04 package installation:

   sudo apt-get install git-core gnupg flex bison gperf libsdl1.2-dev \
   libesd0-dev libwxgtk2.8-dev squashfs-tools build-essential zip curl \
   libncurses5-dev zlib1g-dev pngcrush schedtool libxml2 libxml2-utils \
   xsltproc lzop libc6-dev schedtool g++-multilib lib32z1-dev lib32ncurses5-dev \
   lib32readline-gplv2-dev gcc-multilib libswitch-perl \
   libssl1.0.0 libssl-dev