Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
"64k out to be enough for anyone"
Search
Michael Evans
October 29, 2014
Technology
1
2k
"64k out to be enough for anyone"
64k method limit talk @ DC Droids meetup
Michael Evans
October 29, 2014
Tweet
Share
More Decks by Michael Evans
See All by Michael Evans
#AndroidBuilds at Twitter
michaelevans
0
17
Android U+2764 (❤) Emoji
michaelevans
4
480
Kotlin for Android Developers - DevFest Chicago / DC
michaelevans
1
170
@AnnotationProcessors("ByExample") (Droidcon NYC 2015)
michaelevans
24
21k
Other Decks in Technology
See All in Technology
ガバメントクラウド単独利用方式におけるIaC活用
techniczna
3
270
Amazon FSx for NetApp ONTAPを利用するにあたっての要件整理と設計のポイント
non97
1
160
[JAWS-UG金沢支部×コンテナ支部合同企画]コンテナとは何か
furuton
3
260
ガバメントクラウド先行事業中間報告を読み解く
sugiim
1
1.4k
事業者間調整の行間を読む 調整の具体事例
sugiim
0
1.5k
カメラを用いた店内計測におけるオプトインの仕組みの実現 / ai-optin-camera
cyberagentdevelopers
PRO
1
120
AIを駆使したゲーム開発戦略: 新設AI組織の取り組み / sge-ai-strategy
cyberagentdevelopers
PRO
1
130
スプリントゴールにチームの状態も設定する背景とその効果 / Team state in sprint goals why and impact
kakehashi
2
100
使えそうで使われないCloudHSM
maikamibayashi
0
170
AWS CDKでデータリストアの運用、どのように設計する?~Aurora・EFSの実践事例を紹介~/aws-cdk-data-restore-aurora-efs
mhrtech
4
650
バクラクにおける可観測性向上の取り組み
yuu26
3
420
omakaseしないための.rubocop.yml のつくりかた / How to Build Your .rubocop.yml to Avoid Omakase #kaigionrails
linkers_tech
3
740
Featured
See All Featured
A designer walks into a library…
pauljervisheath
202
24k
How GitHub (no longer) Works
holman
311
140k
Stop Working from a Prison Cell
hatefulcrawdad
267
20k
Designing for Performance
lara
604
68k
Happy Clients
brianwarren
97
6.7k
The Illustrated Children's Guide to Kubernetes
chrisshort
48
48k
Measuring & Analyzing Core Web Vitals
bluesmoon
1
40
Code Review Best Practice
trishagee
64
17k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
26
2.1k
A Tale of Four Properties
chriscoyier
156
23k
Designing Experiences People Love
moore
138
23k
Producing Creativity
orderedlist
PRO
341
39k
Transcript
Mike Evans LivingSocial @m_evans10
“640K ought to be enough for anybody.”
–Dalvik Developers “64K ought to be enough for anybody.”
Dalvik?
Dalvik?
Dalvik The VM that runs Android. Optimized for mobile devices.
Java/Scala/Clojure/etc Compiler (.jar) .class files JAVA ARCHITECTURE
.class files classes.dex Java/Scala/Clojure/etc Compiler dex (.apk) ANDROID ARCHITECTURE
Java/Scala/Clojure/etc Compiler dex optimizer (odex) zipalign proguard ANDROID ARCHITECTURE classes.dex
(.apk) .class files
Okay…what’s the problem?
Unable to execute dex: method ID not in [0, 0xffff]:
65536 ! Conversion to Dalvik format failed: Unable to execute dex: method ID not in [0, 0xffff]: 65536 PROBLEM:
https://source.android.com/devices/tech/dalvik/dex-format.html public final class IndexMap { … public final short[]
typeIds; public final short[] protoIds; public final short[] fieldIds; public final short[] methodIds; …
So what can we do?
SOLUTION #0:
ART? SOLUTION #1:
SOLUTION #2: Proguard Java class file shrinker, optimizer and obfuscator
! Detects and removes unused classes, fields, methods and attributes
SOLUTION #3: Refactor code so that code can be isolated
into 2nd dex Modify classpath during runtime Allow access to methods via reflection ! Facebook did this in 2011 Secondary DEX file
SOLUTION #3: Secondary DEX file Refactor code so that code
can be isolated into 2nd dex Modify classpath during runtime Allow access to methods via reflection ! Facebook did this in 2011
MultiDexApplication BRAND NEW
MultiDexApplication Native in Lollipop ! Part of support library (all
the way to Donut!) ! Not supported officially in developer tools…yet BRAND NEW
an egregious hack
a clever solution an egregious hack
None
$ ./dex-method-counts LivingSocial.apk ! Read in 65490 method IDs. <root>:
65490 : 3 android: 6837 accessibilityservice: 6 bluetooth: 2 … https://github.com/mihaip/dex-method-counts
GPS: 14K methods - collections, caching, primitives support, concurrency libraries,
common annotations, string processing, I/O, and so forth. 23k methods - Basically all of Google’s services. You’ll have a hard time making a compelling app that lives in the Google Play ecosystem without it. GUAVA:
$ gradle app:dependencies —configuration “compile” ! compile - Classpath for
compiling the main sources. +--- com.squareup.picasso:picasso:2.3.3 +--- com.jakewharton:butterknife:5.1.2 +--- com.squareup.retrofit:retrofit:1.6.1 | \--- com.google.code.gson:gson:2.2.4 -> 2.3 \--- de.hdodenhof:circleimageview:1.2.0 … ! BUILD SUCCESSFUL GUAVA:
ads analytics cast auth drive games push location maps wallet
wearable … A clever way for Google to provide support for its many services APIs, all the way back to Gingerbread Google Play Services: {
GAMES DRIVE ADS CAST
https://gist.github.com/MichaelEvans/71150c93577de6f5ab0a Custom Gradle Task - After compilation of .class files
Unzip the original google-play-services rm [plus|games|drive|cast] re-zip a new jar Inject new jar into dependency tree ??? Profit
$ ./dex-method-counts LivingSocial.apk ! Read in 40364 method IDs. <root>:
40364 : 3 android: 6837 accessibilityservice: 6 bluetooth: 2 …
Questions?