首先是下载你使用的Android SDK相对应的源代码
下面这个网站有各种版本的源代码：
http://rgruet.free.fr/public/
android-1.5-cupcake-src.zip
04-Oct-2009 03:07 21.6M
android-1.6_r1-donut-src.zip
04-Oct-2009 03:02 22.9M
android-2.0-eclair-src.zip
21-Nov-2009 01:21 24.4M
android-2.1-eclair-src.zip
06-Jul-2010 13:08 30.2M
android-2.2-froyo-src.zip
06-Jul-2010 12:59 33.4M
然后在对应的SDK版本下目录下建立sources目录，在把代码解压到sources目录下，这样Eclipse就可以直接识别源代码了。
为什么是这个目录呢？
查看
Windows –> Preferences –> Java Build Path –> Libraries –> Android
2.X – > android.jar –> Source attachment
我的步骤：
下载：
http://rgruet.free.fr/public/android-2.1-eclair-src.zip
我的SDK_HOME
是：/home/app/android-sdk/
建立source目录：/home/app/android-sdk/platforms/android-2.1_r01-linux/sources
下面是我的目录结构：/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/android
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/com
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/dalvik
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/dasm
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/data
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/dex
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/dot
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/dxc
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/dxconvext
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/jar
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/java
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/java_cup
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/javax
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/jdiff
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/jp
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/junit
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/mock_android
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/org
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/other
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/otherpackage
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/otherpkg
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/proguard
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/signature
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/spechelper
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/SQLite
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/src
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/sun
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/targets
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/testprogress2
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/tests
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/util
/home/app/android-sdk/platforms/android-2.1_r01-linux/sources/LICENSE
From : http://www.herbertyang.com/