CODEWITHSUNDEEP
androidmodulenullinjectdagger-2
Aetherna
Aetherna

Reputation: 261

Dagger 2 Not injecting into dependant module

I checked all questions but did not find any clue. I stripped my problem to a simplest code:

Situation: I want to have:

    CatComponent catComponent = DaggerCatComponent.builder()
        .kameModule(new KameModule(MainActivity.this))
        .build();
   catComponent.getCatAnalyzer().analyze();

I have created component:

@Component(modules = {KameModule.class, CatAnalyzerModule.class})
public interface CatComponent {

    CatAnalyzer getCatAnalyzer();
}

And modules:

@Module
public class KameModule {

    private Context context;

    public KameModule(Context context) {
        this.context = context;
    }

    @Provides
    KameCat provideKameCat() {
        return new KameCat(context );
    }
}

@Module(includes = KameModule.class)
public class CatAnalyzerModule {

    @Inject
    KameCat cat;

    @Provides
    CatAnalyzer provideCatAnalyzer() {
        return new CatAnalyzer(cat);
    }
}

And classes:

public class KameCat {

    Context context;

    public KameCat(Context context) {
        this.context = context;
    }

    public void doCatStuff() {
        Toast.makeText(context, "Poo and Meow", Toast.LENGTH_LONG).show();
    }
}

public class CatAnalyzer {

    @Inject
    KameCat cat;

    @Inject
    public CatAnalyzer(KameCat cat) {
        this.cat = cat;
    }

    void analyze() {
        cat.doCatStuff();
    }
}

When I retrieve my CatAnalyzer object from CatComponent it has cat field nulled. I have no idea why Dagger won't inject it. Could you guide me somehow?

Upvotes: 3

Views: 1504

Answers (1)

Aetherna
Aetherna

Reputation: 261

Proper code:

@Module(includes = KameModule.class)
public class CatAnalyzerModule {

    @Inject //remove this
    KameCat cat;// remove this

    @Provides
    // Add cat as a argument and let KameModule provide it..
    CatAnalyzer provideCatAnalyzer(KameCat cat) {
        return new CatAnalyzer(cat);
    }
}

Thanks to: https://www.future-processing.pl/blog/dependency-injection-with-dagger-2/

Upvotes: 4

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