Gradle 模块构建顺序

Question

I have a Gradle root project P with two subprojects P:foo and P:bar . Naturally, Gradle builds them in alphabetical order: bar , foo . But I need foo to be built first when I say gradle build in the P root directory. This is because bar depends on the AAR (Android library) artifact that foo publishes to the local Maven repository. Both bar and foo are such Android-library projects.

This looks like an easy problem, but I can't figure it out. I read about evaluationDependsOn , so in bar/build.gradle , I say in the first line: evaluationDependsOn "foo:" . Alas, this does not seem to have any effect. Is this Gradle feature broken in the end?

Using compile project , I could enforce foo to be built first, but that would add the compiled classes directly to bar , which I don't want.

So I'm stuck. I could rename foo to aaa_foo and all my problems would be gone, but I hesitate to call that a solution.

Answer 1

Okay, so let me answer this question myself. I think I found a decent solution.

A project dependency in Gradle is usually expressed by means of compile project , which not only builds the other project but also adds the other project's classes to the classpath of the current project. If you only want to make sure another project is built before yours, you can use a task dependency .

In my Android environment, in bar/build.gradle , I have

preBuild.dependsOn ":foo:build"

and all is well. Now foo is always built before bar .

Answer 2

This may help those with maybe a different cause of the problem.

Say I have a module base which generates output needed by the main module app , so I want base to be built before app .

You can check your settings.gradle in the project root directory and examine the config.

I found my previous config was

include ':app', ':base'

Change it to

include ':base', ':app'

solved the building order.