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Mobile Debugging
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Remy Sharp
September 21, 2012
Technology
75
9.5k
Mobile Debugging
Mobile debugging is a bitch. Let's talk about that, and then fix it.
Remy Sharp
September 21, 2012
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Transcript
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)
None
http://www.flickr.com/photos/60119893@N00/2883012011/
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
Simulators mobilexweb.com/emulators
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
http://jsconsole.com?this
Understand performance
WTF? Wikipedia has more JavaScript than Gmail? http://remysharp.com/mobile-battery-performance/
"200k of JavaScript held within a block comment adds 240ms
during page load, whereas 200k of JavaScript that is parsed during page load added 2600 ms."
Network monitoring
Charles - $50 Fiddler - windows - free
http://code.google.com/p/pcaphar
Make test cases
2. Close the gap http://www.flickr.com/photos/bowbrick/2093650123
Save Refresh
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)
None
jsconsole :listen
weinre “Pronounced like the word ‘winery’. Or maybe like the
word ‘weiner’. Who knows, really.” http://www.flickr.com/photos/booleansplit/6924192819/
Adobe Shadow
iWebInspector / Hooking Web Inspector iWebInspector
jsbin.com
None
Aardwolf http://www.flickr.com/photos/brostad/6294164371
Real debuggers http://www.flickr.com/photos/sidesh0w/6675107387
Chrome for Android
:1337 http://www.flickr.com/photos/blackberryimages/6932160681
:7001
:6000
iOS6
Build your own tools http://www.flickr.com/photos/jannem/3312946500 Test for events Performance metrics
Emulate APIs & event types etc...
remote-tilt.com
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
msie=/*@cc_on!@*/0;
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 @