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  • 1. Gradle not just an ANT replacement
  • 2. Goals of Gradle (from official docs) ● Make it easy reuse code and resources (.aar) ● Make it easy to create several variants of an application ● Make it easy to configure, extend and customize the build process ● Good IDE integration
  • 3. About Gradle ● Is based on groovy: ○ binary-compatible with java ○ Most java code is syntactically valid on Groovy ○ The gradle installation comes with groovy ● You better use a gradle wrapper for your android projects
  • 4. Android Studio ● If something goes wrong, use gradle on the command line ● use this button: ● One update can “break” your project ● If something goes wrong, use gradle on the command line
  • 5. Basic gradle config buildscript { repositories { mavenCentral() } dependencies { classpath 'com.android.tools.build:gradle:0.6.0+' } } apply plugin: 'android' android { compileSdkVersion 19 }
  • 6. Adding libs dependencies { // MavenCentral deps compile 'com.android.support:support-v4:19.0.0' compile 'com.android.support:appcompat-v7:19.0.0' compile 'com.squareup.retrofit:retrofit:1.2.2' compile 'com.squareup.okhttp:okhttp:1.2.1' // project dep: compile project(“:libraries:lib1”) // jar dep: compile files(‘libs/a.jar”, “libs/b.jar”) compile fileTree(dir: “libs”, include: “*.jar”) }
  • 7. Basic gradle commands $ gradle tasks $ gradle tasks --all $ gradle assembleDebug $ gradle assembleRelease $ gradle clean $ gradle installDebug $ gradle uninstallAll
  • 8. Gradle build customization android { compileSdkVersion 19 defaultConfig { versionCode 1 versionName "1.0" minSdkVersion 16 targetSdkVersion 16 } }
  • 9. Build Types buildTypes { debug { packageNameSuffix ".debug" } release { runProguard true proguardFile getDefaultProguardFile('proguard-androidoptimize.txt') } } $ gradle installFreeDebug
  • 10. Build Variants productFlavors { free { packageName "com.bitcoinlab.android.free" buildConfig “public static final boolean FULL_VERSION = false;” } full { packageName "com.bitcoinlab.android.full" versionName "2.0" versionCode 20 buildConfig “public static final boolean FULL_VERSION = true;” signingConfig signingConfigs.myConfig } }
  • 11. Build Variants specific files & deps src/full/java/src/”packagename”/file.java src/full/res/values/strings.xml src/full/AndroidManifest.xml dependencies { fullCompile ‘com.squareup.okhttp:okhttp:1.2.1' } A source file can’t exists on main src folder and at the same time on a flavour src folder: put a class into main, or in every buildType but not both.
  • 12. BuildConfig import java.text.SimpleDateFormat def buildTime() { def df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm'Z'") df.setTimeZone(TimeZone.getTimeZone("UTC")) return df.format(new Date()) } defaultConfig { buildConfig """ public static final String GIT_SHA = "${gitSha()}"; public static final String BUILD_TIME = "${buildTime()}"; """ }
  • 13. Android Studio Integration
  • 14. Some things you can do with gradle ● free/paid apk ● debug/release version ● beta/alpha/”any git branch” apk ● Use multiple flavors + multiple-apk play store support to distribute smaller apks (depending on screen size or android version) ● build your customized integration and test server in minutes
  • 15. Oriol Jiménez @oriolj oriolj@gmail.com