Gradle: How to group Maven Repos in a list

#android #gradle #development

In some of my Gradle based projects, i use libraries which have to be downloaded from many different Maven Repositories. To get a better overview of all used repos i wanted to group them in a list. Unfortunately it was a bit more complicated then i thought it would be. Because i couldn't find other blog posts with my approach, i wanted to share it with you. So here is my solution:

This is how you add one repository to your buildscript:

	repositories {
	maven{url "https://example.org"}
	}

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When you want to add multiple repositories you have add a new maven{} block per URL, something like this :

maven{url "https://example.org",url "https://example1.org"}

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and that:

	list.each {
	maven { url it }
	}

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doesn't work.

The solution

First create a list in a Gradle(Groovy)

def mavenRepos = ["https://example.org","https://example1.org"]

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I created this method, which you have to add in the buildscript{} block:

ext.buildMaven = { p -> repositories { maven { url p } } }

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Now you can use the method buildMaven() inside the repositories{} block inside a .each{} method of your repo list you want to add :

	buildscript {
	ext.buildMaven = { p -> repositories { maven { url p } } }
	ext.kotlin_version = '1.2.31'
	ext.ktor_version = '0.9.1'
	def mavenRepos = ["https://plugins.gradle.org/m2/",
	"https://dl.bintray.com/kotlin/ktor"]

	repositories {
	google()
	jcenter()
	mavenCentral()
	mavenRepos.each { buildMaven(it) }
	}
	dependencies {
	classpath 'com.android.tools.build:gradle:3.1.1'
	classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
	}
	}