Add a project dependency to another project in Android studio

Question

I have a existing project say A which has dependencies over a few projects. Now I want to make this project A as a library project for Project B. What I have done so far is in the build.gradle of Project A, I have changed the plugin from "android:application" to "android:library", My question is how to use the project A as a library module to Project B. When i add a new Module and give its dependency to Project A the build files are not generated in the new module. If a create a new Project for B and then import Project A as a module i get errors on the dependencies used for Project A. Please suggest how to go about.

Answer 1

Edit build.gradle of your module (not the root build.gradle).

Replace apply plugin: 'com.android.application' with apply plugin: 'com.android.library'.

Remove applicationId from the same build.gradle project as described below:

defaultConfig {
    applicationId "com.example.packageName"//remove this line
    minSdkVersion 15
    targetSdkVersion 21
    versionCode 1
    versionName "1.0"
}

After this sync your gradle file. Now your project has been marked as library, but to create a release version of library you need to use this library into a module, so we will create a new module in the same project.

For creating new module go to:

File-> New Module-> (choose)phone and tablet Application->next...

Let's say the new module created is B. Now add dependency of library A on module B as described by user @Sam Rad here.

Run your project, after succesfull Run you will find a release version of library in folder

A->build->outputs-> (.aar package Release version)

Hope this will help