android source code compile

练习编译android源代码。

第一步，下载。

这一步特别困难，google的网站总是断了，download好几天都没有把代码弄全了，最后到处打听，还好能从其他组的server上弄下来一个完整的代码包。

还是把下载的步骤贴下来吧，来源于google的网站：

To install Repo:

1. Make sure you have a bin/ directory in your home directory and that it is included in your path:

   $ mkdir ~/bin$ PATH=~/bin:$PATH

2. Download the Repo tool and ensure that it is executable:

   $ curl https://dl-ssl.google.com/dl/googlesource/git-repo/repo > ~/bin/repo$ chmod a+x ~/bin/repo

After installing Repo, set up your client to access the Android source repository:

1. Create an empty directory to hold your working files. If you're using MacOS, this has to be on a case-sensitive filesystem. Give it any name you like:

   $ mkdir WORKING_DIRECTORY$ cd WORKING_DIRECTORY

2. Run repo init to bring down the latest version of Repo with all its most recent bug fixes. You must specify a URL for the manifest, which specifies where the various repositories included in the Android source will be placed within your working directory.

   $ repo init -u https://android.googlesource.com/platform/manifest

   To check out a branch other than "master", specify it with -b:

   $ repo init -u https://android.googlesource.com/platform/manifest -b android-4.0.1_r1

3. When prompted, configure Repo with your real name and email address.

To pull down the Android source tree to your working directory from the repositories as specified in the default manifest, run

$ repo sync

Using Authentication

By default, access to the Android source code is anonymous. To protect the servers against excessive usage, each IP address is associated with a quota.

When sharing an IP address with other users (e.g. when accessing the source repositories from beyond a NAT firewall), the quotas can trigger even for regular usage patterns (e.g. if many users sync new clients from the same IP address within a short period).

In that case, it is possible to use authenticated access, which then uses a separate quota for each user, regardless of the IP address.

The first step is to create a password from the password generator and to save it in ~/.netrc according to the instructions on that page.

The second step is to force authenticated access, by using the following manifest URI:https://android.googlesource.com/a/platform/manifest. Notice how the /a/ directory prefix triggers mandatory authentication. You can convert an existing client to use mandatory authentication with the following command:

$ repo init -u https://android.googlesource.com/a/platform/manifest

第二步，安装JDK

编译之前，要先安装一些必须的包，首先是java sdk。我用的是Ubuntu 12.04, 用apt-get install sun-java6-jdk的方式已经找不到java sdk了，是因为sun被oracle收购的关系吧？要去oracle的网站上下载jdk的包，是一个名为jdk-6u45-linux-x64.bin的文件。

chmod a+x jdk-6u45-linux-x64.bin

然后运行./jdk-6u45-linux-x64.bin

会解开一个jdk的包，然后要配置相关的环境变量。

编辑/etc/profile

export JAVA_HOME=.../jdk1.6.0_45

export JRE_HOME=.../jdk1.6.0_45/jre

export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH

export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

如果系统中已经安装了operjdk，要配置系统默认的jdk为sun-java-jdk，而不是openjdk.

sudo update-alternatives --install /usr/bin/java java .../jdk1.6.0_45/bin/java 300

sudo update-alternatives --install /usr/bin/javac javac .../jdk1.6.0_45/bin/javac 300

sudo update-alternatives --config java

选择sun-jdk。

然后执行java -version和javac -version检查版本是否正确。

第三步，安装编译需要的包

Ubuntu12.04需要安装的包有：

git-core, gnupg, flex, bison, gperf, build-essential, zip, curl, libc6-dev, libncurses5-dev:i386, x11proto-core-dev, libx11-dev:i386, libreadline6-dev:i386, 

g++-multilib, mingw32, tofrodos, python-markdown, libxml2-utils, xsltproc, libgl1-mesa-dev, zlib1g-dev:i386.

第四步，编译源码

解压缩进入源码所在目录，执行以下命令

1) . build/envsetup.sh

2) set_stuff_for_environment

3) lunch full-eng

4) make update-api

5) make -j4

6) emulator

然后就可以看到android的虚拟机界面了。