Android Studio将Android库项目导出为jar

Question

I'm developing Android Library project. In Eclipse when I want to export it as a jar file:

1. Right click on Project->Export->Java->Jar file
2. I select manually some packages from the src and thats it (no res etc!) - This is the requirements from my Library...
3. In the checkboxes I check: "Export generated class files and resources". And that's it.

Now I migrated to Android Studio, so following some SO discussions I came up with this under gradle.build :

task clearJar(type: Delete) {
    delete 'build/outputs/mysdk.jar'
}

task makeJar(type: Copy) {
    from('build/intermediates/bundles/release/')
    into('build/outputs/')
    include('classes.jar')
    rename ('classes.jar', 'mysdk.jar')
}

makeJar.dependsOn(clearJar, build)

When I then integrate the Jar in some Android App things not working indicating something went wrong with the process of exporting the Jar (The library project is free of errors/warnings etc.).

How to achieve similar behaviour of export to jar of eclipse in Android Studio?

Thanks,

Answer 1

You don't want to produce a jar file as the res/ folder will be missing and anything that references the R file in your code will fail when executed. This is because the jar format doesn't support android res . You want your build to instead target aar format. This is simple using gradle. Instead of applying the application plugin ( apply plugin: 'com.android.application' ) just apply the library plugin ( apply plugin: 'com.android.library' ).

Then the gradle build will produce an aar file which will contain all your resources.

Developers who are still using eclipse will be familiar with how to import aar files because that is the android standard. If they have not learned yet there are plenty of SO posts to help.

Developers who are using gradle or maven will have no problems consuming your sdk