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Reid Baker
Gradle + Android
What it is + How to get up to speed

01
What is Gradle?
? Build system!
? Language independent!
? Flexible dependency
management !
? Built on Groovy!
? Future of android development

Why should you use Gradle?
? Easy setup with Gradle wrapper !
? Make builds faster!
? Separate editor and compiler!
? More control over your builds!
? Control build tools versions!
? Change properties!
? Manage dependencies

GradleWrapper
? No installation of gradle is needed after setting up !
? Sets your version of gradle and where to look for it!
? Works for *NIX and Windows!
? ./gradlew tasks will list what you can do

Faster you say?
? Incremental builds!
? Avoid work you don��t need easily ex. only lint debug
builds and proguard release builds!
? Set ?ags in settings.gradle to make gradle faster?
org.gradle.daemon=true

Freedom to update
? IDE updates can��t break the build!
? Android tool updates can��t break the build!
? install<buildtype> will assemble your apk and install it to the
connected device!
? Dependencies are stored locally in the build directory

It is all about control
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:0.10.+'
}
}
apply plugin: ��android��
!
repositories {
maven {
url ��https://maven.vpn.etonreve.com/repo��
}
}
!
//Where should I find the android tools
//What version of the android tools
!
//Tell gradle to we want to use the
android plugin
!
//Where are the android dependancies
located

Control over your apk
android {
compileSdkVersion 17
buildToolsVersion "19.0.1"
!
sourceSets.main {
java.srcDirs = ['src']
res.srcDirs = ['res']
manifest.srcFile ��AndroidManifest.xml��
}
!
buildTypes {
debug {
debuggable true //unnecessary
packageNameSuffix '.dev'
if (someVariable) {
signingConfig signingConfigs.release
}
}
<Other release types>
}
}

Dependency management
dependencies {
compile project(��:libraries:skitchkit-android")
!
compile ��com.android.support:support-v4:19.0.+��
!
compile ('com.actionbarsherlock:actionbarsherlock:4.4.0@aar') {
exclude group: 'com.android.support', module: 'support-v4'
}
!
compile files('/Users/rbaker/dev/google-play-services.jar')
!
provided 'com.google.android.maps:maps:16_r2'
}

BuildTypes and BuildFlavors
Release Types!
? Ex. Debug, Beta, Release!
? Change package!
? Change signing key
Build ?avors!
? Ex. Architecture, ?
Free/Premium?
Branding!
? Can be grouped !
? Can have different src
and res directories

Lets look at a real build file

Tips andTricks
? ./gradlew uninstall[flavor] will uninstall the previous version!
? Shorten commands with camel case ex.?
./gradlew installAllArchEvernoteDebug?
./gradlew iAAED!
!
!
? Handy command line arguments?
--offline??ag while building to not go to the server??
--refresh-dependencies?to tell Gradle to fetch all new dependencies?!
? Dependencies are cached for 24 hours but you can change how long?
configurations.all {?
resolutionStrategy.cacheDynamicVersionsFor 4, ��hours��?
}!
!
? .aar??le is a zip. you can unzip it to see what��s inside.!
!
? Install the groovy shell to quickly verify that your groovy does what it is supposed to!

Additional Resources
? Start by watching this Google IO talk:?http://
www.youtube.com/watch?v=LCJAgPkpmR0!
? Get up to speed with Groovy:?http://groovy.codehaus.org/
Groovy+style+and+language+feature+guidelines+for+Java
+developers!
? Get up to speed with Gradle:?http://fb?ex.wordpress.com/
2013/05/01/12-new-things-i-learned-from-a-three-day-
gradle-training/!
? More info about resource merging ?http://tools.android.com/
tech-docs/new-build-system/resource-merging

Thanks for coming
Follow me on twitter @reidbaker

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