Android Gradle include module dependencies in another module

Question

I am using the latest Android Studio 3.0.0-beta6 to build my Android project and there's this dependency issue. Gradle encouraged me to replace all compile's with implementation's. Here's my project structure:

Project:

• module1

  • module2

Module1 depends on some libraries, module2 depends on module1. However, the libraries from module1 are not visible in module2. I don't want to copy-paste dependencies and would rather have the library dependencies declared only once. Is there a simple solution to this? Thank you.

module1's build gradle:

dependencies {
    ....
    implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
    ...
}

module2's build gradle:

implementation project(':module1')

Answer 1

In your Root Project -> build.gradle you should have something like:

allprojects {
    repositories {
        jcenter()
    }
}

Add dependencies there!!

UPDATE

If you do not want all your modules to have the common dependencies but only specific modules then do this:

1. Create a folder in your Root Project/gradleScript

2. Create a .gradle file in this folder (e.g. gradleScript/dependencies.gradle) that looks like:

   ext {
   
   //Version
   
   supportLibrary = '22.2.1'
   
   //Support Libraries dependencies
   supportDependencies = [
           design           :         "com.android.support:design:${supportLibrary}",
           recyclerView     :         "com.android.support:recyclerview-v7:${supportLibrary}",
           cardView         :         "com.android.support:cardview-v7:${supportLibrary}",
           appCompat        :         "com.android.support:appcompat-v7:${supportLibrary}",
           supportAnnotation:         "com.android.support:support-annotations:${supportLibrary}",
   ]
   }
   

3. In your root project build.gradle add this line:

   buildscript {
   repositories {
       jcenter()
   }
   dependencies {
       classpath 'com.android.tools.build:gradle:1.2.3'
   }
   }
   
   // Load dependencies
   apply from: 'gradleScript/dependencies.gradle'
   

4. In your modules accordingly add this:

   // Module build file
   
   dependencies {
       //......
       compile supportDependencies.appCompat
       compile supportDependencies.design
   }
   

Hope this helps!!!