Distribute multiple-module library on Bintray for Java and Android developers

Quang Nguyen
Aug 27, 2017 · 3 min read

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Before jumping into technical stuff, I would like to share our story.

Image credit: https://goo.gl/f7K38c

We planned to build a world-class manga(漫画) studio. Our software team firstly created a module that serves as a primary library and it is written purely in Java.

After that, we utilize it to produce concrete mangas. Our first masterpiece is , and our partners would like to integrate it into their Android apps. So, we developed Android module which extends features.

After hard working hours, our products were ready to be delivered to our partners. Because Java and Android developers use Maven repository, so we decide to release all of the mangas on jCenter (one of the popular Maven repository hosts). The process is described as the following diagram.


It has been a while since I published an article about Android library distribution which introduces Maven repository and necessary steps to distribute your library using the Bintray platform. We can follow these steps described in that previous article.

However, our manga studio is growing quickly, and we plan to produce 2 mangas every day. So, we need to find out how to distribute hundreds or thousands of mangas in an easier and more effortless way.

And the last Gradle configuration fits with one module release only.

For a while, I found that there are a lot of libraries out there in the same situation.

Let’s take Retrofit library as an example, you definitely saw multiple modules involved such as , , . From a library user view, when integrating Retrofit in our apps, we must add its core module via Gradle dependence.

compile ‘com.squareup.retrofit2:retrofit:2.3.0’

Other modules are optional based on our need for specific apps.

// Adapters
// Converters

All modules are put in the same project in development but released in different packages on Maven. You can check them out here core Retrofit, RxJava adapter, Gson converter, and so on.

Finally, we found our own way to achieve this goal. In the following part, I would like to introduce a simple way to distribute a multiple-module library on Bintray with a detailed explanation and fully source-code sample.


Please go through the following steps if you would like to distribute your library.

  1. Grab Gradle’s files which help you to build and upload libraries on Bintray here. It is similar to Gradle files you saw in my previous article but small changes. Put them inside /jcenter/ folder as in the sample.
  2. We need a common configuration Gradle file I named .
  3. For each module, let’s create its own and declare its specific configuration details.
  4. In the module’s file, put this line at the bottom to let Gradle know to run it when you call the Bintray upload task.
    apply from: rootProject.file(‘release-bintray.gradle’)
    Sample file.
  5. Almost done, make sure you put your Bintray account credentials inside file as following (this file is ignored by Git, not be uploaded on version control hosting).
    bintray.apikey=your_api_key (i.e: adfasdf342342j34lba84a25f8c3)
  6. Let’s run Gradle task with one command.
  7. Tell other developers to integrate your new awesome library.

For full source codes, please check the sample on Github.

And our two modules are now successfully released into separate packages, manga and doraemon, on Bintray as expected.

Note: The story of building world-class manga studio is just in my imagination, therefore please don’t wait for any more-than-a-stupid-sample masterpiece coming out.

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