环境：
ubuntu：ubuntu-15.04-desktop-amd64
VMware：VMware-workstation-full-11.1.0-2496824，1F04Z-6D111-7Z029-AV0Q4-3AEH8
android：android-5.1.0_r3
一、Initializing a Build Environment
1.Installing the JDK
$ sudo apt-get update
$ sudo apt-get install openjdk-7-jdk
2.Config the JDK
$ sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/java-7-openjdk-amd64/bin/java" 1
$ sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/java-7-openjdk-amd64/bin/javac" 1
$ sudo update-alternatives --set java /usr/lib/jvm/java-7-openjdk-amd64/bin/java
$ sudo update-alternatives --set javac /usr/lib/jvm/java-7-openjdk-amd64/bin/javac
3.Check the JDK
$ java -version
or
$ sudo update-alternatives --config java
$ sudo update-alternatives --config javac
4.Installing required packages
$ sudo apt-get install bison g++-multilib git gperf libxml2-utils make zlib1g-dev:i386 zip
二、Building the System
1.Initialize
$ source build/envsetup.sh
2.Choose a Target
$ lunch 20
3.Update api
$ make update-api
4.Build the Code
$ make -j
参考资料：
1. http://source.android.com/source/initializing.html
2. http://blog.csdn.net/gobitan/article/details/24322561
3. http://source.android.com/source/building-running.html
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