How to download the android 5.0 source code

Step 1: Install ubuntu 14.04 amd64
1. Download the ubuntukylin‐14.04‐desktop‐amd64.iso in the ubuntu website or other site
2. Make a boot disk with the iso file
3. Install the ubuntu with boot disk
 
Step 2: Install oracle-java6-jdk

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java6-installer

It'll keep your java 6 installation up to date.
To automatically set up the Java 6 environment variables JAVA_HOME and PATH:

sudo apt-get install oracle-java6-set-default

Step 3: Install all the neccessary packages
sudo apt-get install  git-core flex bison gperf build-essential curl libncurses5-dev:i386 x11proto-core-dev libx11-dev:i386 libreadline6-dev:i386 libgl1-mesa-glx:i386 libgl1-mesa-dev g++-multilib mingw32 openjdk-6-jdk tofrodos python-markdown libxml2-utils xsltproc zlib1g-dev:i386
 
Step 4: Create a link to the libGL.so
sudo ln -s/usr/lib/i386-linux-gnu/mesa/libGL.so.1/usr/lib/i386-linux-gnu/libGL.so
 
Step 5: Create bin path and add it into the PATH envionment variable
mkdir ~/bin PATH=~/bin:$PATH
 
Android main in GIT: http://android.github.io/
Android repository index in GIT: https://github.com/android
 
Step 6: Download the repo file and grant proper permission
curl "https://github.com/android/tools_repo/blob/master/repo">~/bin/repo chmod 755 ~/bin/repo
 
Step 7: Create android source directory and chagne the path to it.
mkdir -p ~/android/lollipop
cd ~/android/lollipop
 
Step 8: Congiure your email and name
git config --global user.email "[email protected]"
git config --global user.name "Your Name"
 
Step 9: Check all the branch
git ls-remote --tags https://github.com/android/platform_manifest
Step 10: Initialize the repo
repo init -u https://github.com/android/platform_manifest -b android-5.0.0_r2  
Step 11: Update the manifest.xml
1、vim .repo/manifest.xml
2、属性fetchの値を「git://Android.git.linaro.org/"
 
Step 12: Download the source code
repo sync