How does Facebook build its Android app? How are they working to improve the quality, speed and stability? In this talk, we'll cover everything Facebook's Android team does from source control, builds, testing and release, and show you how you can do the same. More details on: http://2013.howtoweb.co/

1. Move Fast and Build Things
Simon Stewart
simons@fb.com
github.com/shs96c
@shs96c

2. The Challenge
>150,000
files
>100,000
commits
>300

3. There is no Android team

4. How do we “move fast”?

5. Build fast

6. The working copy
▪ We
use git for source control
▪ Two
branches we care about day-to-day:
▪
master
▪
stable

7. How the code is organized
Text
http://www.flickr.com/photos/darwinbell/3030214710/

8. Code review

9. Image macros
QuickTime™ and a
GIF decompressor
are needed to see this picture.

10. Dependency injection
http://www.flickr.com/photos/31246066@N04/5253179784/

11. We needed a better tool
▪ Minimal
▪ Keep
▪ IDE
overhead in creating a module
boilerplate out of the codebase
friendly
▪ Faster
clean builds
▪ Faster
incremental builds
▪ Support
ad-hoc build steps

12. Buck: an Android build system
▪ build
rule procedure for producing output files from input files
▪ build
file file (named BUCK) where build rules are declared
▪ build
target string identifier for a build rule

13. Build Target
//java/com/facebook/share:ui
Root of the repository
Directory where the build file can be found
Name of the build rule

14. Build Rule
android_library( name = 'ui', srcs =
glob(['**/*.java']), deps =
[
'//android_res/com/facebook/share:res',
'//java/com/facebook/base:base',
'//thirdparty/java/guava:guava', ], visibility =
[ 'PUBLIC' ],)
)

15. Dependency Graph
AB
GR
AB
AL
AL
GR
AL
AL
AL
AL
AR
AR
AR

16. Dependency Graph
AB
GR
AB
AL
AL
GR
AL
AL
AL
AL
AR
AR
AR

17. Buck is Open Source!
▪ Available
on GitHub: https://github.com/facebook/buck/
▪ Documentation
▪ Apache
▪ Written
▪ Works
galore: http://facebook.github.com/buck/
2.0 License
in Java and a smattering of Python
on OS X and Linux

18. Test fast

19. Developers write tests

20. Unit tests
http://www.flickr.com/photos/aracelota/4773084433/

21. Larger tests
http://www.flickr.com/photos/amphalon/6510474165/

22. Deploy fast

23. Dogfood, Alpha and Beta

24. Questions?