如何使用Groovy Android Gradle Plugin首先编译groovy代码

Question

I am trying to use https://github.com/groovy/groovy-android-gradle-plugin with Android Studio 1.1.0:

buildscript {
    repositories {
        mavenCentral()
        jcenter()
    }
    dependencies {
        classpath 'org.codehaus.groovy:gradle-groovy-android-plugin:0.3.5'
        classpath 'com.android.tools.build:gradle:1.0.1'
    }
}

---

./gradlew -v

------------------------------------------------------------
Gradle 2.2.1
------------------------------------------------------------

Build time:   2014-11-24 09:45:35 UTC
Build number: none
Revision:     6fcb59c06f43a4e6b1bcb401f7686a8601a1fb4a

Groovy:       2.3.6
Ant:          Apache Ant(TM) version 1.9.3 compiled on December 23 2013
JVM:          1.7.0_65 (Oracle Corporation 24.65-b04)
OS:           Linux 3.13.0-24-generic amd64

---

apply plugin: 'groovyx.grooid.groovy-android'
...
dependencies {
    compile 'org.codehaus.groovy:groovy:2.4.0:grooid'
    compile 'com.android.support:multidex:1.0.0'
}

---

I have some Groovy classes that extend from Android SDK classes and my application Java classes that extend from Groovy classes. Groovy classes are under src/main/groovy and Java classes are under src/main/java.

Groovy:

package com.yavezu.client.android.fragment.models.object;
import android.support.v4.app.Fragment;

public abstract class ObjectFragment2<E extends Base> extends Fragment {}
public abstract class ExistingObjectFragment2 <E extends Base> extends ObjectFragment2<E> {}

Java:

package com.yavezu.client.android.fragment.models.object;
public abstract class ObjectViewFragment<E extends Base> extends ExistingObjectFragment2<E> {}

When I build my project I get the following error:

Error:(13, 66) error: cannot find symbol class ExistingObjectFragment2

It seems that gradle compiles java code first, then groovy code. But here I need the groovy code to be compiled first and then java code, because java code depends on groovy code.

I see two possible solutions this:

1. Put groovy code in a separate module and depend on it explicitly, but it looks like workaround, since I do not really need an extra module
2. Put java code under src/main/groovy. This would probably make java code be compiled with groovyc (please, correct me if I am wrong), but I prefer pure java code to be compiled with javac (for compatibility and performance reasons)

Is there a way to make groovy code compiled before java code in the same module?

Answer 1

Option two or setting up the plugin to look at the java source folder is your best bet. If you need to do joint compilation, which it looks like you do, you need the groovy compiler to see both java and groovy files.