Android Library (What, Why, How)

Updated 14 December 2016


What Is Android Library?

An Android library is structurally the same as an Android app module. It can include everything needed to build an app, including source code, resource files, and an Android manifest. However, instead of compiling into an APK that runs on a device, an Android library compiles into an Android Archive (AAR) file that you can use as a dependency for an Android app module.


Why And When To Use?

How To Create?

Step 1 : Creating module.

:- Either to create a new library module in your project.

  1. Click  File > New > New Module > Android Library > Next >Finish

:- Or converting an existing app module to Library module.

  1. Open the build.gradle file for the existing app module. At the top, you should see the following:

  2. Change the plugin assignment as shown here:

  3. Click Sync Project with Gradle Files.

:- Or import the library module to your project.

  1. Click File > New > Import Module.
  2. Enter the location of the library module directory then click Finish.


Step 2: Setup dependency & configuration

:-   In your  settings.gradle file add   


                   include ‘:app’, ‘:my-library-module’

Where “app” is application module, and “my-library-module” is library module.


:- Open the app module’s build.gradle file and add a new line to the dependencies block as                        shown in the following


                               compile project(“:my-library-module”)


:- Click Sync Project with Gradle Files.


Now Any code and resources in the Android library (my-library-module) are  accessible to your app module (app), and the library AAR file is bundled into your APK at build time.



Development considerations:-

As you develop your library modules and dependent apps, be aware of the following behaviors and limitations.


Once you have added references to library modules to your Android app module, you can set their relative priority. At build time, the libraries are merged with the app one at a time, starting from the lowest priority to the highest.



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