September 21, 2012
Mobile debugging is a bitch. Let's talk about that, and then fix it.
September 21, 2012
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Mobile Debugging Remy Sharp / @rem
Debugging is a... http://www.flickr.com/photos/grill/2655848033
...and I ❤ debugging http://www.flickr.com/photos/grill/2655848033
Back in early 2000
Our first mobile webapp circa 1999 Amazingly actually still live!!!
XML parsing :( (but strict is strict)
Art of debugging methodically Replicate so that you can Isolate
and ultimately Eliminate
Principles 1. Know thy enemy 2. Close the gap 3.
Expect the unexpected
1. Know thy enemy
ݾ൴ɼඦፌෆຆɻ “If you know both yourself and your enemy, you
can win a hundred battles without jeopardy.” http://www.flickr.com/photos/katieharbath/4856255673
Get real devices http://www.flickr.com/photos/sidesh0w/6675107387 http://bradfrostweb.com/blog/mobile/test-on-real-mobile-devices-without-breaking-the-bank/
Get FREE devices http://www.flickr.com/photos/sidesh0w/6675107387 http://bradfrostweb.com/blog/mobile/test-on-real-mobile-devices-without-breaking-the-bank/
Share devices http://www.flickr.com/photos/sidesh0w/6675107387
Charles - $50 Fiddler - windows - free
Make test cases
2. Close the gap http://www.flickr.com/photos/bowbrick/2093650123
Host locally •Network Utility (mac) ifconfig en0 inet / ifconfig
eth0 ipconfig (look for ip4v) •Point mobile to that IP •localtunnel (to get out of VMs)
weinre “Pronounced like the word ‘winery’. Or maybe like the
word ‘weiner’. Who knows, really.” http://www.flickr.com/photos/booleansplit/6924192819/
iWebInspector / Hooking Web Inspector iWebInspector
Real debuggers http://www.flickr.com/photos/sidesh0w/6675107387
Chrome for Android
Build your own tools http://www.flickr.com/photos/jannem/3312946500 Test for events Performance metrics
Emulate APIs & event types etc...
jsbin 3 jsbin.com
3. Expect the unexpected http://www.flickr.com/photos/jdhancock/3669455809
Once upon a time... Demoing mobile app Same code Same
mobile device Same OS version But different result
Wifi != ISP network
Tether and check via desktop O2 you can change username
to "bypass" to confirm bugs, not to solve them. Also will need to check with providers to be sure.
iPod Touch would crash upon render
Last resort debugging 50/50
Emulating slow connections http://www.flickr.com/photos/63885769@N00/4696519429
Network Link Conditioner (xcode + mac) Slowy.app (mac + $)
ipfw (mac / *nix) sloppy http://www.dallaway.com/sloppy/ (java app) wipfw (windows)
Beware of red herrings console.log
“When you have eliminated the impossible, whatever remains, however improbable,
must be the truth”
If all else fails, take a break.
We need to demand more
My dream: Single Debugging Tool 1. Can we build this
ourselves? 2. Can we hook in and normalise all the remote protocols? 3. Can we do step debugging?
I think so, but it'll be a challenge.....
Otherwise: rock on. @rem leftlogic.com Hire us @