CODEWITHSUNDEEP
androidkotlindagger-2
Ralph Bergmann
Ralph Bergmann

Reputation: 3076

Module must be set

I try to use the new Dagger Android injection thing that works so far.

Now I want to extend it to my needs.

In my MainActivityModule I added a TestModule:

@Module
abstract class MainActivityModule {

    @ActivityScope
    @ContributesAndroidInjector(modules = arrayOf(TestModule::class))
    internal abstract fun contributeMainActivityInjector(): MainActivity
}

The TestModule is really simple:

@Module
internal abstract class TestModule {

    @Provides
    internal fun provideTest(): String {
        return "foo bar"
    }
}

But I get this error: TestModule must be set

I looked into the generated source code but can't find a hint what I have to do. I searched for this at Google too but found only simple examples :-(

What have I forgotten? You can find the complete app at GitHub.

Edit

As Jeff Bowman sayed the provideTest() needs to be static. When I create a Java class like this:

@Module
public class TestModule {

    @Provides
    static String provide() {
        return "foo bar";
    }
}

it works.

So the final question: How to make this in Kotlin? This doesn't work:

@Module
internal abstract class TestModule {

    companion object {

        @Provides
        @JvmStatic
        internal fun provideTest(): String {
            return "foo bar"
        }
    }
}

So I need another way to create a static method.

Upvotes: 4

Views: 920

Answers (2)

Luca Vitucci
Luca Vitucci

Reputation: 3734

An alternative solution, that's a bit cleaner in case you need to mock / replace dependencies in tests, would be to avoid making the class abstract, and keep the provides not static, like this:

@Module
internal class TestModule {

    @Provides
    internal fun provideTest(): String {
        return "foo bar"
    }

}

Upvotes: 0

Ralph Bergmann
Ralph Bergmann

Reputation: 3076

yeh I found a solution :-)

The Kotlin way to get a static method is to put the method in a companion object but now Dagger throws an error that the @Provides can only be used in a @Module. To fix this I annotated the companion object too

@Module
internal abstract class TestModule {

    @Module
    companion object {

        @Provides
        @JvmStatic
        internal fun provideTest(): String {
            return "foo bar"
        }
    }
}

Upvotes: 5

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