How to add a dependency to another project properly using gradle?

问题

Hello I am new to gradle and it is a little bit confusing for me. How should I add a dependency in my gradle configuration to have access to B1.java in projectA1? Project B is gradle project and project A is just a folder with another gradle projects.

Here is my structure:

1. Workspace:
   • ProjectA
     • projectA1
       • ...
       • here I want to have access to B1.java
       • build.gradle
     • projectA2
       • ...
       • build.gradle
   • ProjectB
     • projectB1
       • B1.java
       • ...
       • build.gradle
     • projectB2
       • ...
       • build.gradle
     • build.gradle

I tried to read gradle documentation, but it is not clear for me. Any help appreciated. Thanks!

回答1:

You should have a structure like this:

ProjectA
|--projectA1
|----build.gradle
|--projectA2
|----build.gradle
|--settings.gradle
|--build.gradle

ProjectB
|--projectB1
|----build.gradle
|--projectB2
|----build.gradle
|--settings.gradle
|--build.gradle

You can link an external module in your project.

1) In your project projectA/settings.gradle

include ':projectA1',':projectA2',':projectB1' 
project(':projectB1').projectDir = new File("/workspace/projectB/projectB1")

2) Add dependency in build.gradle of projectA1 module

dependencies {
    compile project(':projectB1')
}

回答2:

Unless if projects A1 and B1 live in the same source repository and are checked-out and checked-in together, you really should depend on project B1 as an external dependency.

in Project A1 build.gradle:

dependencies{
    compile 'projectB1group:projectB1module:projectB1version'
}

Of course, for this to work, you will have had to publish B1 binaries to a repository that is accessible from Project A1 first. This can either be a external nexus/artifactory type maven repository, but can also be your local maven .m2 cache, or even a plain old file system. For maven publishing see maven or 'maven-publish` plugins.

---

If both projects live in the same source repo, you should organize ProjectA and ProjectB as subprojects under a root "container" project. The root project does not need to have source code of its own.

Read about organizing multi-project builds in gradle here.

If the root project has a settings.gradle with include lines that includes project B1, you can refer to any project under the root project like this:

project(':B1')

so, to add B1 as a dependency to A1, in A1's build.gradle:

compile project('B1')

回答3:

1. Edit setting.gradle in root path and include your sub projects, and then subproject will be able to see and depend on each other.

root
 |-- build.gradle << very simple bulid.grade , no special thing.
 |-- setting.gradle <<

rootProject.name = 'root'

file("${rootDir}/ProjectA").eachDirMatch(~/.*/) {
    include "ProjectA:${it.name}"
}

file("${rootDir}/ProjectB").eachDirMatch(~/.*/) {
    include "ProjectB:${it.name}"
}

2. build.gradle in project

root
 |-- ProjectA
        |-- projectA1
            |-- build.gradle  <<

implementation project(':ProjectB:projectB1')

Ref:

• You can this setting.gradle in spring project

• Official documentation : Declaring Dependencies between Subprojects

• Official documentation : setting.gradle and demo

来源：https://stackoverflow.com/questions/35606790/how-to-add-a-dependency-to-another-project-properly-using-gradle