The document discusses the benefits of open source libraries, highlighting their quality, innovation, and interoperability. It introduces various libraries such as OkHttp for efficient HTTP client functionality and Picasso for image downloading and caching in Android, along with testing tools like Robolectric, Mockito, and Fest. Additionally, it mentions TDD resources for iOS development, including objc-timessquare and ponydebugger.

1. Cool Open Source Libs
Nabil HACHICHA
GDG DevFest 2013 Algiers

2. Why Open Source?
● Better quality
○ Developed by many passionate developers
○ Innovation and enhancements over time
● Open standards & interoperability
● It’s hard to develop without it

3. Use case
● Develop & test a small app (Employees list)

4. Use case
Architecture
Request content from network

5. Use case
Architecture
ListView Adapter, based on a
simple POJO

6. Use case
Architecture
Fragment holding our ListView

7. Use case
Architecture
Parse HTML using Xpath

8. OkHttp
● Efficient Http client, based on java.net.
HttpURLConnection or Apache HttpClient
● Can also be used as as the transport layer
for Volley

9. OkHttp
● SPDY support, allows all requests to the
same host to share a socket.
● Transparent GZIP
● Silently recover from common connection
problems
● Recovers from problematic proxy servers
and failed SSL handshakes
● Connection pooling reduces request latency
(if SPDY isn’t available)

10. OkHttp
● SPDY support, allows all requests to the
same host to share a socket.
● Transparent GZIP
● Silently recover from common connection
problems
● Recovers from problematic proxy servers
and failed SSL handshakes
● Connection pooling reduces request latency
(if SPDY isn’t available)

11. OkHttp
● SPDY support, allows all requests to the
same host to share a socket.
● Transparent GZIP
● Silently recover from common connection
problems
● Recovers from problematic proxy servers
and failed SSL handshakes
● Connection pooling reduces request latency
(if SPDY isn’t available)

12. OkHttp
● SPDY support, allows all requests to the
same host to share a socket.
● Transparent GZIP
● Silently recover from common connection
problems
● Recovers from problematic proxy servers
and failed SSL handshakes
● Connection pooling reduces request latency
(if SPDY isn’t available)

13. OkHttp
● SPDY support, allows all requests to the
same host to share a socket.
● Transparent GZIP
● Silently recover from common connection
problems
● Recovers from problematic proxy servers
and failed SSL handshakes
● Connection pooling reduces request latency
(if SPDY isn’t available)

14. Picasso
● A powerful image downloading and caching
library for Android

15. Picasso
● Handling ImageView recycling and download
cancelation in an adapter
● Complex image transformations with minimal
memory use.
● Automatic memory and disk caching.

16. Code

17. Testsing
Robolectric
Mockito
FEST

18. Robolectric
● Run Android tests inside JVM
● Instruct Robolectric to configure Android
differently
○ use a non-standard manifest file
○ use French resources on a sideways high-res
display (qualifiers)

19. Mockito
● Mocking framework, with fluent API syntaxe

20. FEST
● Fixtures for Easy Software Testing
● Simplify software testing by providing a
fluent Assertions
● Just use assertThat
● FEST Android, extension of FEST

21. FEST
Example:
● Regular JUNIT
assertEquals(View.GONE,view.getVisibility())
● Regular FEST
assertThat(view.getVisibility()).isEqualTo
(View.GONE)
● FEST Android
assertThat(view).isGone()

22. Code

23. TDD
● objc-TimesSquare
○ calendar view for your apps
● PonyDebugger
○ Remote network and data debugging for your native
iOS app using Chrome Developer Tools
● SocketRocket
○ WebSocket client library
● objc-mocktail
○ stub out HTTP servers in your Objective-C app.
● KIF
○ Keep It Functional - An iOS Functional Testing
Framework

24. Thanks!
Q&A
Links http://square.github.io/