Managing Multi-module Android Project with Gradle Plugin and Kotlin

In this talk, I will discuss how the Gradle plugin works, and how we can write a custom plugin in Kotlin to help us manage an Android multi-module project. I will also present techniques to provide custom configurations in our Gradle plugin so that we can modify our build depending on the module, and further, extend the plugin's capabilities by integrating it with other Gradle plugins; e.g., Jacoco plugin. Lastly, I will share our experience of building a Gradle plugin and explore the benefits and limitations that I've encountered.

1. ©2020 Wantedly, Inc. Managing Multi-module Project with Gradle Plugin and Kotlin .droidcon APAC 2020 15 Dec 2020 - Malvin Sutanto Photo by Jan Antonin Kolar on Unsplash
2. ©2020 Wantedly, Inc. Introduction Malvin Sutanto Software Engineer - Android Twitter/ Medium: @malvinsutanto
3. ©2020 Wantedly, Inc. Multi module setup in Android projects
4. ©2020 Wantedly, Inc. BQQ MJCOBWJHBUJPO QSFGFSFODFT MJCBOBMZUJDT EBUB OFUXPSL GFBUVSFTFBSDI GFBUVSFVTFS Multi module setup in Android
5. ©2020 Wantedly, Inc. BQQ MJCOBWJHBUJPO QSFGFSFODFT MJCBOBMZUJDT EBUB OFUXPSL GFBUVSFTFBSDI GFBUVSFVTFS Multi module setup in Android
6. ©2020 Wantedly, Inc. Multi module setup in Android
7. ©2020 Wantedly, Inc. Multi module setup in Android • Faster build time
8. ©2020 Wantedly, Inc. Multi module setup in Android • Faster build time • Easier to manage and work with
9. ©2020 Wantedly, Inc. Multi module setup in Android • Faster build time • Easier to manage and work with • New features • Instant apps • Dynamic feature modules
10. ©2020 Wantedly, Inc. Multi module setup in Android
11. ©2020 Wantedly, Inc. However Multi module setup in Android
12. ©2020 Wantedly, Inc. Multi module setup in Android
13. ©2020 Wantedly, Inc. • Each module need a build.gradle file Multi module setup in Android
14. ©2020 Wantedly, Inc. • Each module need a build.gradle file • Duplicate build script across modules Multi module setup in Android
15. ©2020 Wantedly, Inc. • Each module need a build.gradle file • Duplicate build script across modules • Build files became hard to maintain Multi module setup in Android
16. ©2020 Wantedly, Inc. build.gradle file for a library module Multi module setup in Android plugins { id 'com.android.library' id 'kotlin-android' } android { compileSdkVersion 30 buildToolsVersion "30.0.2" defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" consumerProguardFiles "consumer-rules.pro" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" implementation 'androidx.core:core-ktx:1.2.0' implementation 'androidx.appcompat:appcompat:1.1.0' implementation 'com.google.android.material:material:1.1.0' testImplementation 'junit:junit:4.+' androidTestImplementation 'androidx.test.ext:junit:1.1.1' androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' }
17. ©2020 Wantedly, Inc. build.gradle file for a library module Multi module setup in Android plugins { id 'com.android.library' id 'kotlin-android' } android { compileSdkVersion 30 buildToolsVersion "30.0.2" defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" consumerProguardFiles "consumer-rules.pro" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" implementation 'androidx.core:core-ktx:1.2.0' implementation 'androidx.appcompat:appcompat:1.1.0' implementation 'com.google.android.material:material:1.1.0' testImplementation 'junit:junit:4.+' androidTestImplementation 'androidx.test.ext:junit:1.1.1' androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' } • Declares Gradle plugins • Sets build parameters • Declares dependencies
18. ©2020 Wantedly, Inc. Gradle plugin Simplifies build scripts
19. ©2020 Wantedly, Inc. What is Gradle?
20. ©2020 Wantedly, Inc. What is Gradle?
21. ©2020 Wantedly, Inc. What is Gradle? • “Generic” build automation tool
22. ©2020 Wantedly, Inc. What is Gradle? • “Generic” build automation tool • Declares input and output files
23. ©2020 Wantedly, Inc. What is Gradle? • “Generic” build automation tool • Declares input and output files • Tasks as its core
24. ©2020 Wantedly, Inc. Gradle Build phases Gradle build phases
25. ©2020 Wantedly, Inc. Gradle Build phases Gradle build phases *OJUJBMJ[BUJPO
26. ©2020 Wantedly, Inc. Gradle Build phases Gradle build phases *OJUJBMJ[BUJPO $POpHVSBUJPO
27. ©2020 Wantedly, Inc. Gradle Build phases Gradle build phases *OJUJBMJ[BUJPO $POpHVSBUJPO &YFDVUJPO
28. ©2020 Wantedly, Inc. build.gradle file Domain Specific Language (DSL) plugins { id 'com.android.library' id 'kotlin-android' } android { compileSdkVersion 30 buildToolsVersion "30.0.2" defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" consumerProguardFiles "consumer-rules.pro" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" implementation 'androidx.core:core-ktx:1.2.0' implementation 'androidx.appcompat:appcompat:1.1.0' implementation 'com.google.android.material:material:1.1.0' testImplementation 'junit:junit:4.+' androidTestImplementation 'androidx.test.ext:junit:1.1.1' androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' } • Configuration file • Describes build steps • Available in Groovy and Kotlin Gradle Build.gradle file
29. ©2020 Wantedly, Inc. build.gradle file Domain Specific Language (DSL) plugins { id 'com.android.library' id 'kotlin-android' } android { compileSdkVersion 30 buildToolsVersion "30.0.2" defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" consumerProguardFiles "consumer-rules.pro" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" implementation 'androidx.core:core-ktx:1.2.0' implementation 'androidx.appcompat:appcompat:1.1.0' implementation 'com.google.android.material:material:1.1.0' testImplementation 'junit:junit:4.+' androidTestImplementation 'androidx.test.ext:junit:1.1.1' androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' } • Configuration file • Describes build steps • Available in Groovy and Kotlin Extension block Gradle Build.gradle file
30. ©2020 Wantedly, Inc. build.gradle file Domain Specific Language (DSL) plugins { id 'com.android.library' id 'kotlin-android' } android { compileSdkVersion 30 buildToolsVersion "30.0.2" defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" consumerProguardFiles "consumer-rules.pro" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" implementation 'androidx.core:core-ktx:1.2.0' implementation 'androidx.appcompat:appcompat:1.1.0' implementation 'com.google.android.material:material:1.1.0' testImplementation 'junit:junit:4.+' androidTestImplementation 'androidx.test.ext:junit:1.1.1' androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' } • Configuration file • Describes build steps • Available in Groovy and Kotlin Gradle plugins Extension block Gradle Build.gradle file
31. ©2020 Wantedly, Inc. Gradle plugin
32. ©2020 Wantedly, Inc. Gradle Plugin
33. ©2020 Wantedly, Inc. Gradle Plugin • Extends the Gradle model • Adds new configuration block and options
34. ©2020 Wantedly, Inc. Gradle Plugin • Extends the Gradle model • Adds new configuration block and options • Configures project according conventions • Adds new tasks • Configures sensible defaults
35. ©2020 Wantedly, Inc. Gradle Plugin • Extends the Gradle model • Adds new configuration block and options • Configures project according conventions • Adds new tasks • Configures sensible defaults • Applies specific configuration • Enforces standards
36. ©2020 Wantedly, Inc. Types of Gradle Plugin Gradle Plugin
37. ©2020 Wantedly, Inc. Script plugin • Additional build script that is located separately. • Can exist in local filesystem or remote location. • Multiple script plugins can be applied. • apply from: 'other.gradle' Types of Gradle Plugin Gradle Plugin
38. ©2020 Wantedly, Inc. Script plugin • Additional build script that is located separately. • Can exist in local filesystem or remote location. • Multiple script plugins can be applied. • apply from: 'other.gradle' Binary plugin • Written programmatically by implementing Plugin interface, • Applied using unique plugin id • plugins { id 'com.android.library' id 'kotlin-android' } Types of Gradle Plugin Gradle Plugin
39. ©2020 Wantedly, Inc. Script plugin • Additional build script that is located separately. • Can exist in local filesystem or remote location. • Multiple script plugins can be applied. • apply from: 'other.gradle' Binary plugin • Written programmatically by implementing Plugin interface, • Applied using unique plugin id • plugins { id 'com.android.library' id 'kotlin-android' } Types of Gradle Plugin Gradle Plugin
40. ©2020 Wantedly, Inc. Creating a Gradle Plugin
41. ©2020 Wantedly, Inc. Gradle Plugin
42. ©2020 Wantedly, Inc. What will the plugin do? Gradle Plugin
43. ©2020 Wantedly, Inc. What will the plugin do? For each module, it will: Gradle Plugin
44. ©2020 Wantedly, Inc. What will the plugin do? Gradle Plugin
45. ©2020 Wantedly, Inc. • Apply other Gradle plugins What will the plugin do? Gradle Plugin
46. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters What will the plugin do? Gradle Plugin
47. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters • Specify default proguard files What will the plugin do? Gradle Plugin
48. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters • Specify default proguard files • Enable Java 8 features What will the plugin do? Gradle Plugin
49. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters • Specify default proguard files • Enable Java 8 features • Declare dependencies What will the plugin do? Gradle Plugin
50. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters • Specify default proguard files • Enable Java 8 features • Declare dependencies • Configure Jacoco and custom extensions What will the plugin do? Gradle Plugin
51. ©2020 Wantedly, Inc. my-lib/build.gradle.kts Gradle Plugin
52. ©2020 Wantedly, Inc. plugins { id("com.android.library") // or .application id("my-custom-plugin-id") } android { buildTypes { getByName("debug") { isTestCoverageEnabled = true } } } myPluginOptions { jacoco { isEnabled = true } } dependencies { … } my-lib/build.gradle.kts Gradle Plugin
53. ©2020 Wantedly, Inc. plugins { id("com.android.library") // or .application id("my-custom-plugin-id") } android { buildTypes { getByName(“debug") { isTestCoverageEnabled = true } } } myPluginOptions { jacoco { isEnabled = true } } dependencies { … } my-lib/build.gradle.kts Gradle Plugin
54. ©2020 Wantedly, Inc. plugins { id("com.android.library") // or .application id("my-custom-plugin-id") } android { buildTypes { getByName(“debug") { isTestCoverageEnabled = true } } } myPluginOptions { jacoco { isEnabled = true } } dependencies { … } my-lib/build.gradle.kts Gradle Plugin
55. ©2020 Wantedly, Inc. plugins { id("com.android.library") // or .application id("my-custom-plugin-id") } android { buildTypes { getByName(“debug") { isTestCoverageEnabled = true } } } myPluginOptions { jacoco { isEnabled = true } } dependencies { … } my-lib/build.gradle.kts Gradle Plugin
56. ©2020 Wantedly, Inc. plugins { id("com.android.library") // or .application id("my-custom-plugin-id") } android { buildTypes { getByName(“debug") { isTestCoverageEnabled = true } } } myPluginOptions { jacoco { isEnabled = true } } dependencies { … } my-lib/build.gradle.kts Gradle Plugin
57. ©2020 Wantedly, Inc. plugins { id("com.android.library") id("my-custom-plugin-id") } android { buildTypes { getByName(“debug") { isTestCoverageEnabled = true } } } myPluginOptions { jacoco { isEnabled = true } } dependencies { … } my-lib/build.gradle.kts Gradle Plugin
58. ©2020 Wantedly, Inc. plugins { id("com.android.library") id("my-custom-plugin-id") } android { buildTypes { getByName(“debug") { isTestCoverageEnabled = true } } } myPluginOptions { jacoco { isEnabled = true } } dependencies { … } plugins { id 'com.android.library' id 'kotlin-android' } android { compileSdkVersion 30 buildToolsVersion "30.0.2" defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" consumerProguardFiles "consumer-rules.pro" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" implementation 'androidx.core:core-ktx:1.2.0' implementation 'androidx.appcompat:appcompat:1.1.0' implementation 'com.google.android.material:material:1.1.0' testImplementation 'junit:junit:4.+' androidTestImplementation 'androidx.test.ext:junit:1.1.1' androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' } my-lib/build.gradle.kts Gradle Plugin
59. ©2020 Wantedly, Inc. Gradle plugin Setup
60. ©2020 Wantedly, Inc. my-project/ - buildSrc/ - build.gradle.kts - src/main/kotlin/com/mypackage/ - MyCustomPlugin.kt - app/ - my-lib/ Project Structure Gradle Plugin
61. ©2020 Wantedly, Inc. my-project/ - buildSrc/ - build.gradle.kts - src/main/kotlin/com/mypackage - MyCustomPlugin.kt - app/ - my-lib/ Project Structure Gradle Plugin
62. ©2020 Wantedly, Inc. buildSrc/src/build.gradle.kts plugins { `java-gradle-plugin` `kotlin-dsl` } repositories { google() mavenCentral() } dependencies { implementation("com.android.tools.build:gradle:$agpVersion") implementation(kotlin("gradle-plugin")) } Gradle Plugin
63. ©2020 Wantedly, Inc. plugins { `java-gradle-plugin` `kotlin-dsl` } repositories { google() mavenCentral() } dependencies { implementation("com.android.tools.build:gradle:$agpVersion") implementation(kotlin("gradle-plugin")) } buildSrc/src/build.gradle.kts Gradle Plugin
64. ©2020 Wantedly, Inc. plugins { `java-gradle-plugin` `kotlin-dsl` } repositories { google() mavenCentral() } dependencies { implementation("com.android.tools.build:gradle:$agpVersion") implementation(kotlin("gradle-plugin")) } buildSrc/src/build.gradle.kts Gradle Plugin
65. ©2020 Wantedly, Inc. plugins { `java-gradle-plugin` `kotlin-dsl` } repositories { google() mavenCentral() } dependencies { implementation("com.android.tools.build:gradle:$agpVersion") implementation(kotlin("gradle-plugin")) } buildSrc/src/build.gradle.kts Gradle Plugin
66. ©2020 Wantedly, Inc. plugins { `java-gradle-plugin` `kotlin-dsl` } repositories { google() mavenCentral() } dependencies { implementation("com.android.tools.build:gradle:$agpVersion") implementation(kotlin("gradle-plugin")) } buildSrc/src/build.gradle.kts Gradle Plugin
67. ©2020 Wantedly, Inc. plugins { `java-gradle-plugin` `kotlin-dsl` } repositories { google() mavenCentral() } dependencies { implementation("com.android.tools.build:gradle:$agpVersion") implementation(kotlin("gradle-plugin")) } https://android-developers.googleblog.com/2020/12/announcing-android-studio-arctic-fox.html buildSrc/src/build.gradle.kts Gradle Plugin
68. ©2020 Wantedly, Inc. my-project/ - buildSrc/ - build.gradle.kts - src/main/kotlin/com/mypackage/ - MyCustomPlugin.kt - app/ - my-lib/ Project Structure Gradle Plugin
69. ©2020 Wantedly, Inc. Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
70. ©2020 Wantedly, Inc. Gradle Plugin class MyCustomPlugin : Plugin<Project> { buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
71. ©2020 Wantedly, Inc. Gradle Plugin class MyCustomPlugin : Plugin<Project> { Module buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
72. ©2020 Wantedly, Inc. Gradle Plugin class MyCustomPlugin : Plugin<Project> { override fun apply(project: Project) { // TODO: Write build configurations here. } } Module buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
73. ©2020 Wantedly, Inc. Gradle plugin Implementation
74. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters • Specify default proguard files • Enable Java 8 features • Declare dependencies • Configure Jacoco and custom extensions What will the plugin do? Gradle Plugin
75. ©2020 Wantedly, Inc. Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
76. ©2020 Wantedly, Inc. override fun apply(project: Project) { Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
77. ©2020 Wantedly, Inc. override fun apply(project: Project) { project.plugins.apply("kotlin-android") } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
78. ©2020 Wantedly, Inc. override fun apply(project: Project) { project.plugins.apply("kotlin-android") } Plugin id // build.gradle plugins { id 'com.android.library' id 'kotlin-android' } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
79. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters • Specify default proguard files • Enable Java 8 features • Declare dependencies • Configure Jacoco and custom extensions What will the plugin do? Gradle Plugin
80. ©2020 Wantedly, Inc. Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
81. ©2020 Wantedly, Inc. override fun apply(project: Project) { … val androidExtension = project.extensions.getByName("android") if (androidExtension is BaseExtension) { androidExtension.applyAndroidSettings() } } private fun BaseExtension.applyAndroidSettings() { compileSdkVersion(30) defaultConfig { targetSdkVersion(30) minSdkVersion(23) // etc. } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
82. ©2020 Wantedly, Inc. override fun apply(project: Project) { … val androidExtension = project.extensions.getByName("android") if (androidExtension is BaseExtension) { androidExtension.applyAndroidSettings() } } private fun BaseExtension.applyAndroidSettings() { compileSdkVersion(30) defaultConfig { targetSdkVersion(30) minSdkVersion(23) // etc. } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
83. ©2020 Wantedly, Inc. override fun apply(project: Project) { … val androidExtension = project.extensions.getByName("android") if (androidExtension is BaseExtension) { androidExtension.applyAndroidSettings() } } private fun BaseExtension.applyAndroidSettings() { compileSdkVersion(30) defaultConfig { targetSdkVersion(30) minSdkVersion(23) // etc. } } // build.gradle android { compileSdkVersion 30 defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
84. ©2020 Wantedly, Inc. override fun apply(project: Project) { … val androidExtension = project.extensions.getByName("android") if (androidExtension is BaseExtension) { androidExtension.applyAndroidSettings() } } private fun BaseExtension.applyAndroidSettings() { compileSdkVersion(30) defaultConfig { targetSdkVersion(30) minSdkVersion(23) // etc. } } // build.gradle android { compileSdkVersion 30 defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
85. ©2020 Wantedly, Inc. override fun apply(project: Project) { … val androidExtension = project.extensions.getByName("android") if (androidExtension is BaseExtension) { androidExtension.applyAndroidSettings() } } private fun BaseExtension.applyAndroidSettings() { compileSdkVersion(30) defaultConfig { targetSdkVersion(30) minSdkVersion(23) // etc. } } // build.gradle android { compileSdkVersion 30 defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" } } Base class for all Android plugin extension classes Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
86. ©2020 Wantedly, Inc. override fun apply(project: Project) { … val androidExtension = project.extensions.getByName("android") if (androidExtension is BaseExtension) { androidExtension.applyAndroidSettings() } } private fun BaseExtension.applyAndroidSettings() { compileSdkVersion(30) defaultConfig { targetSdkVersion(30) minSdkVersion(23) // etc. } } // build.gradle android { compileSdkVersion 30 defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
87. ©2020 Wantedly, Inc. override fun apply(project: Project) { … val androidExtension = project.extensions.getByName("android") if (androidExtension is BaseExtension) { androidExtension.applyAndroidSettings() } } private fun BaseExtension.applyAndroidSettings() { compileSdkVersion(30) defaultConfig { targetSdkVersion(30) minSdkVersion(23) // etc. } } // build.gradle android { compileSdkVersion 30 defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
88. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters • Specify default proguard files • Enable Java 8 features • Declare dependencies • Configure Jacoco and custom extensions What will the plugin do? Gradle Plugin
89. ©2020 Wantedly, Inc. Types of plugin Gradle Plugin
90. ©2020 Wantedly, Inc. Application module Library module id("com.android.application") id("com.android.library") Types of plugin Gradle Plugin
91. ©2020 Wantedly, Inc. Application module • Set isMinifyEnabled only on release Library module id("com.android.application") id("com.android.library") Types of plugin Gradle Plugin
92. ©2020 Wantedly, Inc. Application module • Set isMinifyEnabled only on release • Specify proguard files using proguardFiles() Library module id("com.android.application") id("com.android.library") Types of plugin Gradle Plugin
93. ©2020 Wantedly, Inc. Application module • Set isMinifyEnabled only on release • Specify proguard files using proguardFiles() Library module • Specify proguard files using consumerProguardFiles() id("com.android.application") id("com.android.library") Types of plugin Gradle Plugin
94. ©2020 Wantedly, Inc. Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
95. ©2020 Wantedly, Inc. override fun apply(project: Project) { … val androidExtension = project.extensions.getByName(“android") if (androidExtension is BaseExtension) { androidExtension.applyAndroidSettings() androidExtension.applyProguardSettings() } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
96. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
97. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
98. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } proguard-rules.pro files in each module’s root Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
99. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
100. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } // build.gradle plugins { id 'com.android.library' id 'my-custom-plugin-id' } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
101. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } // build.gradle plugins { id 'com.android.library' id 'my-custom-plugin-id' } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
102. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } // build.gradle plugins { id 'com.android.library' id 'my-custom-plugin-id' } // build.gradle android { defaultConfig { ... consumerProguardFiles "proguard-rules.pro" } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
103. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
104. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } // build.gradle plugins { id 'com.android.application' id 'my-custom-plugin-id' } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
105. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } Enable obfuscation only on "release" build // build.gradle plugins { id 'com.android.application' id 'my-custom-plugin-id' } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
106. ©2020 Wantedly, Inc. private fun BaseExtension.applyProguardSettings() { val proguardFile = "proguard-rules.pro" when (this) { is LibraryExtension -> defaultConfig { consumerProguardFiles(proguardFile) } is AppExtension -> buildTypes { getByName("release") { isMinifyEnabled = true isShrinkResources = true proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), proguardFile ) } } } } Enable obfuscation only on "release" build // build.gradle plugins { id 'com.android.application' id 'my-custom-plugin-id' } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
107. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters • Specify default proguard files • Enable Java 8 features • Declare dependencies • Configure Jacoco and custom extensions What will the plugin do? Gradle Plugin
108. ©2020 Wantedly, Inc. Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
109. ©2020 Wantedly, Inc. override fun apply(project: Project) { … val androidExtension = project.extensions.getByName("android") if (androidExtension is BaseExtension) { ... androidExtension.enableJava8(project) } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
110. ©2020 Wantedly, Inc. Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
111. ©2020 Wantedly, Inc. private fun BaseExtension.enableJava8(project: Project) { compileOptions { isCoreLibraryDesugaringEnabled = true sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } project.tasks.withType<KotlinCompile>().configureEach { kotlinOptions { jvmTarget = "1.8" } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
112. ©2020 Wantedly, Inc. private fun BaseExtension.enableJava8(project: Project) { compileOptions { isCoreLibraryDesugaringEnabled = true sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } project.tasks.withType<KotlinCompile>().configureEach { kotlinOptions { jvmTarget = "1.8" } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
113. ©2020 Wantedly, Inc. private fun BaseExtension.enableJava8(project: Project) { compileOptions { isCoreLibraryDesugaringEnabled = true sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } project.tasks.withType<KotlinCompile>().configureEach { kotlinOptions { jvmTarget = "1.8" } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
114. ©2020 Wantedly, Inc. private fun BaseExtension.enableJava8(project: Project) { compileOptions { isCoreLibraryDesugaringEnabled = true sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } project.tasks.withType<KotlinCompile>().configureEach { kotlinOptions { jvmTarget = "1.8" } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
115. ©2020 Wantedly, Inc. private fun BaseExtension.enableJava8(project: Project) { compileOptions { isCoreLibraryDesugaringEnabled = true sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } project.tasks.withType<KotlinCompile>().configureEach { kotlinOptions { jvmTarget = "1.8" } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
116. ©2020 Wantedly, Inc. private fun BaseExtension.enableJava8(project: Project) { compileOptions { isCoreLibraryDesugaringEnabled = true sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } project.tasks.withType<KotlinCompile>().configureEach { kotlinOptions { jvmTarget = "1.8" } } } Java 8 core library desugaring Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
117. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters • Specify default proguard files • Enable Java 8 features • Declare dependencies • Configure Jacoco and custom extensions What will the plugin do? Gradle Plugin
118. ©2020 Wantedly, Inc. private fun BaseExtension.enableJava8(project: Project) { compileOptions { isCoreLibraryDesugaringEnabled = true sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } project.dependencies { add("coreLibraryDesugaring", "com.android.tools:desugar_jdk_libs:1.0.9") } ... } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
119. ©2020 Wantedly, Inc. private fun BaseExtension.enableJava8(project: Project) { compileOptions { isCoreLibraryDesugaringEnabled = true sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } project.dependencies { add("coreLibraryDesugaring", "com.android.tools:desugar_jdk_libs:1.0.9") } ... } Configuration name Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
120. ©2020 Wantedly, Inc. project.dependencies { add("implementation", "androidx.core:core-ktx:1.2.0") add("testImplementation", "junit:junit:4.12") add("androidTestImplementation", "androidx.test.ext:junit:1.1.1") } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
121. ©2020 Wantedly, Inc. • Apply other Gradle plugins • Set common build parameters • Specify default proguard files • Enable Java 8 features • Declare dependencies • Configure Jacoco and custom extensions What will the plugin do? Gradle Plugin
122. ©2020 Wantedly, Inc. my-lib/build.gradle.kts Gradle Plugin
123. ©2020 Wantedly, Inc. plugins { id("com.android.library") // or .application id("my-custom-plugin-id") } android { buildTypes { getByName("debug") { isTestCoverageEnabled = true } } } myPluginOptions { jacoco { isEnabled = true } } dependencies { … } my-lib/build.gradle.kts Gradle Plugin
124. ©2020 Wantedly, Inc. plugins { id("com.android.library") // or .application id("my-custom-plugin-id") } android { buildTypes { getByName("debug") { isTestCoverageEnabled = true } } } myPluginOptions { jacoco { isEnabled = true } } dependencies { … } my-lib/build.gradle.kts Gradle Plugin
125. ©2020 Wantedly, Inc. Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
126. ©2020 Wantedly, Inc. override fun apply(project: Project) { project.extensions.create<MyPluginOptionExtension>("myPluginOptions") … if (androidExtension is BaseExtension) { … androidExtension.configureJacoco(project) } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
127. ©2020 Wantedly, Inc. override fun apply(project: Project) { project.extensions.create<MyPluginOptionExtension>("myPluginOptions") … if (androidExtension is BaseExtension) { … androidExtension.configureJacoco(project) } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
128. ©2020 Wantedly, Inc. override fun apply(project: Project) { project.extensions.create<MyPluginOptionExtension>("myPluginOptions") … if (androidExtension is BaseExtension) { … androidExtension.configureJacoco(project) } } Extension class Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
129. ©2020 Wantedly, Inc. override fun apply(project: Project) { project.extensions.create<MyPluginOptionExtension>("myPluginOptions") … if (androidExtension is BaseExtension) { … androidExtension.configureJacoco(project) } } Extension class // build.gradle.kts myPluginOptions { jacoco { isEnabled = true } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
130. ©2020 Wantedly, Inc. open class MyPluginOptionExtension { val jacoco: JacocoOptions = JacocoOptions() fun jacoco(action: Action<JacocoOptions>) { action.execute(jacoco) } } class JacocoOptions { var isEnabled: Boolean = true } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyPluginOptionExtension.kt
131. ©2020 Wantedly, Inc. open class MyPluginOptionExtension { val jacoco: JacocoOptions = JacocoOptions() fun jacoco(action: Action<JacocoOptions>) { action.execute(jacoco) } } class JacocoOptions { var isEnabled: Boolean = true } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyPluginOptionExtension.kt
132. ©2020 Wantedly, Inc. open class MyPluginOptionExtension { val jacoco: JacocoOptions = JacocoOptions() fun jacoco(action: Action<JacocoOptions>) { action.execute(jacoco) } } class JacocoOptions { var isEnabled: Boolean = true } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyPluginOptionExtension.kt
133. ©2020 Wantedly, Inc. open class MyPluginOptionExtension { val jacoco: JacocoOptions = JacocoOptions() fun jacoco(action: Action<JacocoOptions>) { action.execute(jacoco) } } class JacocoOptions { var isEnabled: Boolean = true } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyPluginOptionExtension.kt
134. ©2020 Wantedly, Inc. open class MyPluginOptionExtension { val jacoco: JacocoOptions = JacocoOptions() fun jacoco(action: Action<JacocoOptions>) { action.execute(jacoco) } } class JacocoOptions { var isEnabled: Boolean = true } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyPluginOptionExtension.kt
135. ©2020 Wantedly, Inc. open class MyPluginOptionExtension { val jacoco: JacocoOptions = JacocoOptions() fun jacoco(action: Action<JacocoOptions>) { action.execute(jacoco) } } class JacocoOptions { var isEnabled: Boolean = true } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyPluginOptionExtension.kt
136. ©2020 Wantedly, Inc. // build.gradle.kts myPluginOptions { jacoco { isEnabled = true } } open class MyPluginOptionExtension { val jacoco: JacocoOptions = JacocoOptions() fun jacoco(action: Action<JacocoOptions>) { action.execute(jacoco) } } class JacocoOptions { var isEnabled: Boolean = true } // build.gradle myPluginOptions { jacoco { enabled true } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyPluginOptionExtension.kt
137. ©2020 Wantedly, Inc. open class MyPluginOptionExtension { val jacoco: JacocoOptions = JacocoOptions() fun jacoco(action: Action<JacocoOptions>) { action.execute(jacoco) } } class JacocoOptions { var isEnabled: Boolean = true } // build.gradle.kts myPluginOptions { jacoco { isEnabled = true } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyPluginOptionExtension.kt
138. ©2020 Wantedly, Inc. open class MyPluginOptionExtension { val jacoco: JacocoOptions = JacocoOptions() fun jacoco(action: Action<JacocoOptions>) { action.execute(jacoco) } } class JacocoOptions { var isEnabled: Boolean = true } // build.gradle.kts myPluginOptions { jacoco { isEnabled = true } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyPluginOptionExtension.kt
139. ©2020 Wantedly, Inc. open class MyPluginOptionExtension { val jacoco: JacocoOptions = JacocoOptions() fun jacoco(action: Action<JacocoOptions>) { action.execute(jacoco) } } class JacocoOptions { var isEnabled: Boolean = true } // build.gradle.kts myPluginOptions { jacoco { isEnabled = true } } https://docs.gradle.org/current/userguide/custom_gradle_types.html https://docs.gradle.org/current/userguide/lazy_configuration.html#lazy_configuration Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyPluginOptionExtension.kt
140. ©2020 Wantedly, Inc. override fun apply(project: Project) { project.extensions.create<MyPluginOptionExtension>("myPluginOptions") … if (androidExtension is BaseExtension) { … androidExtension.configureJacoco(project) } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
141. ©2020 Wantedly, Inc. private fun BaseExtension.configureJacoco(project: Project) { project.afterEvaluate { val jacocoOptions = project.extensions.getByType<MyPluginOptionExtension>() .jacoco if (jacocoOptions.isEnabled) { project.plugins.apply("jacoco") when (this@configureJacoco) { is LibraryExtension -> configureJacocoTasks(project, libraryVariants) is AppExtension -> configureJacocoTasks(project, applicationVariants) } } } } private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { ... } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
142. ©2020 Wantedly, Inc. private fun BaseExtension.configureJacoco(project: Project) { project.afterEvaluate { val jacocoOptions = project.extensions.getByType<MyPluginOptionExtension>() .jacoco if (jacocoOptions.isEnabled) { project.plugins.apply("jacoco") when (this@configureJacoco) { is LibraryExtension -> configureJacocoTasks(project, libraryVariants) is AppExtension -> configureJacocoTasks(project, applicationVariants) } } } } private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { ... } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
143. ©2020 Wantedly, Inc. private fun BaseExtension.configureJacoco(project: Project) { project.afterEvaluate { val jacocoOptions = project.extensions.getByType<MyPluginOptionExtension>() .jacoco if (jacocoOptions.isEnabled) { project.plugins.apply("jacoco") when (this@configureJacoco) { is LibraryExtension -> configureJacocoTasks(project, libraryVariants) is AppExtension -> configureJacocoTasks(project, applicationVariants) } } } } private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { ... } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
144. ©2020 Wantedly, Inc. private fun BaseExtension.configureJacoco(project: Project) { project.afterEvaluate { val jacocoOptions = project.extensions.getByType<MyPluginOptionExtension>() .jacoco if (jacocoOptions.isEnabled) { project.plugins.apply("jacoco") when (this@configureJacoco) { is LibraryExtension -> configureJacocoTasks(project, libraryVariants) is AppExtension -> configureJacocoTasks(project, applicationVariants) } } } } private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { ... } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
145. ©2020 Wantedly, Inc. private fun BaseExtension.configureJacoco(project: Project) { project.afterEvaluate { val jacocoOptions = project.extensions.getByType<MyPluginOptionExtension>() .jacoco if (jacocoOptions.isEnabled) { project.plugins.apply("jacoco") when (this@configureJacoco) { is LibraryExtension -> configureJacocoTasks(project, libraryVariants) is AppExtension -> configureJacocoTasks(project, applicationVariants) } } } } private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { ... } // build.gradle.kts myPluginOptions { jacoco { isEnabled = true } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
146. ©2020 Wantedly, Inc. private fun BaseExtension.configureJacoco(project: Project) { project.afterEvaluate { val jacocoOptions = project.extensions.getByType<MyPluginOptionExtension>() .jacoco if (jacocoOptions.isEnabled) { project.plugins.apply("jacoco") when (this@configureJacoco) { is LibraryExtension -> configureJacocoTasks(project, libraryVariants) is AppExtension -> configureJacocoTasks(project, applicationVariants) } } } } private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { ... } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
147. ©2020 Wantedly, Inc. private fun BaseExtension.configureJacoco(project: Project) { project.afterEvaluate { val jacocoOptions = project.extensions.getByType<MyPluginOptionExtension>() .jacoco if (jacocoOptions.isEnabled) { project.plugins.apply("jacoco") when (this@configureJacoco) { is LibraryExtension -> configureJacocoTasks(project, libraryVariants) is AppExtension -> configureJacocoTasks(project, applicationVariants) } } } } private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { ... } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
148. ©2020 Wantedly, Inc. private fun BaseExtension.configureJacoco(project: Project) { project.afterEvaluate { val jacocoOptions = project.extensions.getByType<MyPluginOptionExtension>() .jacoco if (jacocoOptions.isEnabled) { project.plugins.apply("jacoco") when (this@configureJacoco) { is LibraryExtension -> configureJacocoTasks(project, libraryVariants) is AppExtension -> configureJacocoTasks(project, applicationVariants) } } } } private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { ... } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
149. ©2020 Wantedly, Inc. private fun BaseExtension.configureJacoco(project: Project) { project.afterEvaluate { val jacocoOptions = project.extensions.getByType<MyPluginOptionExtension>() .jacoco if (jacocoOptions.isEnabled) { project.plugins.apply("jacoco") when (this@configureJacoco) { is LibraryExtension -> configureJacocoTasks(project, libraryVariants) is AppExtension -> configureJacocoTasks(project, applicationVariants) } } } } private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { ... } "debug" "release" Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
150. ©2020 Wantedly, Inc. private fun BaseExtension.configureJacoco(project: Project) { project.afterEvaluate { val jacocoOptions = project.extensions.getByType<MyPluginOptionExtension>() .jacoco if (jacocoOptions.isEnabled) { project.plugins.apply("jacoco") when (this@configureJacoco) { is LibraryExtension -> configureJacocoTasks(project, libraryVariants) is AppExtension -> configureJacocoTasks(project, applicationVariants) } } } } private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { ... } "debug" "release" "debug" "release" "flavorDebug" "flavorRelease" Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
151. ©2020 Wantedly, Inc. private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { variants.all { val variantName = name val isDebuggable = buildType.isDebuggable if (!isDebuggable) return@all project.tasks.register<JacocoReport>("jacoco${variantName.capitalize()}Report") { // Set up the rest of the Jacoco tasks dependency, exec files, etc. } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
152. ©2020 Wantedly, Inc. private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { variants.all { val variantName = name val isDebuggable = buildType.isDebuggable if (!isDebuggable) return@all project.tasks.register<JacocoReport>("jacoco${variantName.capitalize()}Report") { // Set up the rest of the Jacoco tasks dependency, exec files, etc. } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
153. ©2020 Wantedly, Inc. private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { variants.all { val variantName = name val isDebuggable = buildType.isDebuggable if (!isDebuggable) return@all project.tasks.register<JacocoReport>("jacoco${variantName.capitalize()}Report") { // Set up the rest of the Jacoco tasks dependency, exec files, etc. } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
154. ©2020 Wantedly, Inc. private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { variants.all { val variantName = name val isDebuggable = buildType.isDebuggable if (!isDebuggable) return@all project.tasks.register<JacocoReport>("jacoco${variantName.capitalize()}Report") { // Set up the rest of the Jacoco tasks dependency, exec files, etc. } } } Skip non-debuggable builds Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
155. ©2020 Wantedly, Inc. private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { variants.all { val variantName = name val isDebuggable = buildType.isDebuggable if (!isDebuggable) return@all project.tasks.register<JacocoReport>("jacoco${variantName.capitalize()}Report") { // Set up the rest of the Jacoco tasks dependency, exec files, etc. } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
156. ©2020 Wantedly, Inc. private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { variants.all { val variantName = name val isDebuggable = buildType.isDebuggable if (!isDebuggable) return@all project.tasks.register<JacocoReport>("jacoco${variantName.capitalize()}Report") { // Set up the rest of the Jacoco tasks dependency, exec files, etc. } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
157. ©2020 Wantedly, Inc. private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { variants.all { val variantName = name val isDebuggable = buildType.isDebuggable if (!isDebuggable) return@all project.tasks.register<JacocoReport>("jacoco${variantName.capitalize()}Report") { // Set up the rest of the Jacoco tasks dependency, exec files, etc. } } } "debug" "release" "flavorDebug" "flavorRelease" Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
158. ©2020 Wantedly, Inc. private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { variants.all { val variantName = name val isDebuggable = buildType.isDebuggable if (!isDebuggable) return@all project.tasks.register<JacocoReport>("jacoco${variantName.capitalize()}Report") { // Set up the rest of the Jacoco tasks dependency, exec files, etc. } } } "debug" "release" "flavorDebug" "flavorRelease" Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
159. ©2020 Wantedly, Inc. private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { variants.all { val variantName = name val isDebuggable = buildType.isDebuggable if (!isDebuggable) return@all project.tasks.register<JacocoReport>("jacoco${variantName.capitalize()}Report") { // Set up the rest of the Jacoco tasks dependency, exec files, etc. } } } ./gradlew :lib:jacocoDebugReport ./gradlew :app:jacocoFlavorDebugReport "debug" "release" "flavorDebug" "flavorRelease" Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
160. ©2020 Wantedly, Inc. private fun configureJacocoTasks( project: Project, variants: DomainObjectSet<out BaseVariant> ) { variants.all { val variantName = name val isDebuggable = buildType.isDebuggable if (!isDebuggable) return@all project.tasks.register<JacocoReport>("jacoco${variantName.capitalize()}Report") { // Set up the rest of the Jacoco tasks dependency, exec files, etc. } } } Gradle Plugin buildSrc/src/main/kotlin/com/mypackage/MyCustomPlugin.kt
161. ©2020 Wantedly, Inc. Apply Gradle plugin on other modules
162. ©2020 Wantedly, Inc. plugins { ... } gradlePlugin { plugins { register("my-custom-plugin") { id = "my-custom-plugin-id" implementationClass = "com.mypackage.MyCustomPlugin" } } } repositories { ... } dependencies { ... } buildSrc/src/build.gradle.kts Gradle Plugin
163. ©2020 Wantedly, Inc. plugins { ... } gradlePlugin { plugins { register("my-custom-plugin") { id = "my-custom-plugin-id" implementationClass = "com.mypackage.MyCustomPlugin" } } } repositories { ... } dependencies { ... } buildSrc/src/build.gradle.kts Gradle Plugin
164. ©2020 Wantedly, Inc. plugins { ... } gradlePlugin { plugins { register("my-custom-plugin") { id = "my-custom-plugin-id" implementationClass = "com.mypackage.MyCustomPlugin" } } } repositories { ... } dependencies { ... } buildSrc/src/build.gradle.kts Gradle Plugin
165. ©2020 Wantedly, Inc. plugins { ... } gradlePlugin { plugins { register("my-custom-plugin") { id = "my-custom-plugin-id" implementationClass = "com.mypackage.MyCustomPlugin" } } } repositories { ... } dependencies { ... } // lib/build.gradle.kts plugins { id("com.android.library") id("my-custom-plugin-id") } buildSrc/src/build.gradle.kts Gradle Plugin
166. ©2020 Wantedly, Inc. plugins { ... } gradlePlugin { plugins { register("my-custom-plugin") { id = "my-custom-plugin-id" implementationClass = "com.mypackage.MyCustomPlugin" } } } repositories { ... } dependencies { ... } // lib/build.gradle.kts plugins { id("com.android.library") id("my-custom-plugin-id") } class MyCustomPlugin : Plugin<Project> { ... } buildSrc/src/build.gradle.kts Gradle Plugin
167. ©2020 Wantedly, Inc. Gradle plugin Benefits
168. ©2020 Wantedly, Inc. Benefits Gradle Plugin
169. ©2020 Wantedly, Inc. Benefits • Share build logic across modules • Reduce maintenance cost when updating build scripts Gradle Plugin
170. ©2020 Wantedly, Inc. Benefits • Share build logic across modules • Reduce maintenance cost when updating build scripts • Higher degree of modularization • Better organization and comprehensibility Gradle Plugin
171. ©2020 Wantedly, Inc. Benefits • Share build logic across modules • Reduce maintenance cost when updating build scripts • Higher degree of modularization • Better organization and comprehensibility • Encapsulates logic • Declarative build scripts • Automatically configures tasks and its dependencies Gradle Plugin
172. ©2020 Wantedly, Inc. Our experience Gradle Plugin
173. ©2020 Wantedly, Inc. • Helped migration to build.gradle.kts Our experience Gradle Plugin
174. ©2020 Wantedly, Inc. • Helped migration to build.gradle.kts • Make use of Gradle API • Apply Gradle plugin to build.gradle files written in Groovy Our experience Gradle Plugin
175. ©2020 Wantedly, Inc. • Helped migration to build.gradle.kts • Make use of Gradle API • Apply Gradle plugin to build.gradle files written in Groovy • Gradually migrate to Kotlin build.gradle.kts files Our experience Gradle Plugin
176. ©2020 Wantedly, Inc. plugins { id 'com.android.library' id 'kotlin-android' } android { compileSdkVersion 30 buildToolsVersion "30.0.2" defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" consumerProguardFiles "consumer-rules.pro" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" implementation 'androidx.core:core-ktx:1.2.0' implementation 'androidx.appcompat:appcompat:1.1.0' implementation 'com.google.android.material:material:1.1.0' testImplementation 'junit:junit:4.+' androidTestImplementation 'androidx.test.ext:junit:1.1.1' androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' } Our experience Gradle Plugin
177. ©2020 Wantedly, Inc. plugins { id 'com.android.library' id 'kotlin-android' } android { compileSdkVersion 30 buildToolsVersion "30.0.2" defaultConfig { minSdkVersion 23 targetSdkVersion 30 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" consumerProguardFiles "consumer-rules.pro" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" implementation 'androidx.core:core-ktx:1.2.0' implementation 'androidx.appcompat:appcompat:1.1.0' implementation 'com.google.android.material:material:1.1.0' testImplementation 'junit:junit:4.+' androidTestImplementation 'androidx.test.ext:junit:1.1.1' androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' } // build.gradle plugin { id 'com.android.library' id 'my-custom-plugin-id' } myPluginOptions { jacoco { enabled true } } Our experience Gradle Plugin
178. ©2020 Wantedly, Inc. // build.gradle plugin { id 'com.android.library' id 'my-custom-plugin-id' } myPluginOptions { jacoco { enabled true } } Our experience Gradle Plugin
179. ©2020 Wantedly, Inc. // build.gradle plugin { id 'com.android.library' id 'my-custom-plugin-id' } myPluginOptions { jacoco { enabled true } } // build.gradle.kts plugin { id("com.android.library") id("my-custom-plugin-id") } myPluginOptions { jacoco { isEnabled = true } } Our experience Gradle Plugin
180. ©2020 Wantedly, Inc. Our experience Gradle Plugin
181. ©2020 Wantedly, Inc. • buildSrc vs standalone plugin Our experience Gradle Plugin
182. ©2020 Wantedly, Inc. • buildSrc vs standalone plugin • Plugin is very specific to each project Our experience Gradle Plugin
183. ©2020 Wantedly, Inc. • buildSrc vs standalone plugin • Plugin is very specific to each project • But, split the plugins when necessary depending on its purpose • e.g., Jacoco as its own plugin Our experience Gradle Plugin
184. ©2020 Wantedly, Inc. Summary
185. ©2020 Wantedly, Inc. Summary Gradle Plugin
186. ©2020 Wantedly, Inc. Summary • Maintaining build.gradle files can be tedious Gradle Plugin
187. ©2020 Wantedly, Inc. Summary • Maintaining build.gradle files can be tedious • Gradle plugin can simplify the maintenance process Gradle Plugin
188. ©2020 Wantedly, Inc. Summary • Maintaining build.gradle files can be tedious • Gradle plugin can simplify the maintenance process • Make Gradle plugin configurable using extension Gradle Plugin
189. ©2020 Wantedly, Inc. Thank you @MalvinSutanto