Gradle script for publishing Android library with sources and javadoc to Maven repository using maven-publish plugin.

maven-publish-helper-usage.gradle

// You can use maven-publish-helper.gradle script without changes and even share it between multiple
// modules. Just place the maven-publish-helper.gradle file in the root directory of your project,
// then apply it at the bottom of your module's build.gradle file like this:

// ...content of module's build.gradle file...

apply from: '../maven-publish-helper.gradle'

publishing {
	publications {
		release(MavenPublication) {
			// Specify own groupId as package name of your library,
			// otherwise it would just use project's name (=name of the root directory) by default.
			groupId 'com.example'

			// Specify custom artifactId if needed,
			// otherwise it would use module's name by default.
			//artifactId 'custom-artifact'

			// You can specify custom version,
			// otherwise it would use version from `android { defaultConfig { ... } }` by default.
			//version = '1.0'
		}
	}
}

maven-publish-helper.gradle

/**
 * Maven Publish Helper
 *
 * Requires Android Gradle plugin 3.6.0 or higher (available since Android Studio 3.6).
 * See also: https://developer.android.com/studio/build/maven-publish-plugin
 *
 * @Author Robert Pösel
 * @Version 1.5
 * @Date 3.3.2020
 */

apply plugin: 'maven-publish'

task androidJavadocs(type: Javadoc) {
	source = android.sourceSets.main.java.srcDirs
	classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
	android.libraryVariants.all { variant ->
		if (variant.name == 'release') {
			owner.classpath += variant.javaCompileProvider.get().classpath
		}
	}
	exclude '**/R.html', '**/R.*.html', '**/index.html'
}

task androidJavadocsJar(type: Jar, dependsOn: androidJavadocs) {
	archiveClassifier.set('javadoc')
	from androidJavadocs.destinationDir
}

task androidSourcesJar(type: Jar) {
	archiveClassifier.set('sources')
	from android.sourceSets.main.java.srcDirs
}

// Because the components are created only during the afterEvaluate phase, you must
// configure your publications using the afterEvaluate() lifecycle method.
afterEvaluate {
	publishing {
		publications {
			// Creates a Maven publication called "release".
			release(MavenPublication) {
				// Applies the component for the release build variant.
				from components.release

				// Adds javadocs and sources as separate jars.
				artifact androidJavadocsJar
				artifact androidSourcesJar

				// You can customize attributes of the publication here or in module's build.gradle file.
				//groupId = 'com.example'
				//artifactId = 'custom-artifact'
				version = android.defaultConfig.versionName // or just '1.0'
			}
		}
	}
}

@AndroidDeveloperLB You are missing the android { publishing { ... } } block as I mentioned in earlier comment: https://gist.github.com/Robyer/a6578e60127418b380ca133a1291f017?permalink_comment_id=4082108#gistcomment-4082108

@Robyer But I never had this. It seems new.
Look, on these repositories it worked fine without this part:

https://github.com/AndroidDeveloperLB/CommonUtils/blob/main/library/build.gradle
https://github.com/AndroidDeveloperLB/apk-parser/blob/master/mylibrary/build.gradle

And here, even other parts weren't added and they still worked fine:

https://github.com/AndroidDeveloperLB/FastScrollerAndRecyclerViewFixes/blob/main/library/build.gradle

https://github.com/AndroidDeveloperLB/AutoFitTextView/blob/master/AutoFitTextViewLibrary/build.gradle

Why does it keep getting more and more annoying ? In the past all I had to do is having an android-library module, and the website took care of everything...

Anyway, I've tried to add it, and it still has an issue:

https://jitpack.io/com/github/AndroidDeveloperLB/ColorPicker/2237cd55a3/build.log
https://github.com/AndroidDeveloperLB/ColorPicker

@AndroidDeveloperLB I don't know why it worked before in your case, but right now it is supposed to be done as I said in the comment.

This is actually very simple and easy to do when compared to what I had to do in the past (again, I can't see how it could work in your case).

@Robyer So what's wrong now with what I have?
Look:
https://github.com/AndroidDeveloperLB/ColorPicker/blob/2237cd55a36524c379e033cd0c5205b514ef4f05/library/build.gradle#L26

@AndroidDeveloperLB Hmm, you must probably configure it differently when you are using Kotlin - maybe that's also reason why it worked for you previously. This my gist is for Java projects and I confirm it works as I specified above, but you may need a different approach for Kotlin projects.

Maybe this will help? https://kotlinlang.org/docs/multiplatform-publish-lib.html
Otherwise use StackOverflow instead, someone will definitely help you there.

@Robyer It was Java based, and had gradle and not kts.
I tried kts just to see how to do it, but got back to gradle after seeing it might be the reason to the issues.