AndroidWorkerInjection.java

## AndroidWorkerInjection.java
public class AndroidWorkerInjection {

    public static void inject(Worker worker) {
        checkNotNull(worker, "worker");
        Object application = worker.getApplicationContext();
        if (!(application instanceof HasWorkerInjector)) {
            throw new RuntimeException(
                    String.format(
                            "%s does not implement %s",
                            application.getClass().getCanonicalName(),
                            HasWorkerInjector.class.getCanonicalName()));
        }

        AndroidInjector<Worker> workerInjector =
                ((HasWorkerInjector) application).workerInjector();
        checkNotNull(workerInjector, "%s.workerInjector() returned null", application.getClass());
        workerInjector.inject(worker);
    }
}

## AndroidWorkerInjectionModule.java

@Module
public abstract class AndroidWorkerInjectionModule {

    @Multibinds
    abstract Map<Class<? extends Worker>, AndroidInjector.Factory<? extends Worker>>
        workerInjectorFactories();
}

## AppComponent.java
@Singleton
@Component(modules = {
        AndroidSupportInjectionModule.class,
        AndroidWorkerInjectionModule.class,
        WorkerModule.class})
public interface AppComponent {
    @Component.Builder
    interface Builder {
        @BindsInstance
        Builder application(MyApplication application);
        AppComponent build();
    }
    void inject(MyApplication app);
}

## HasWorkerInjector.java
public interface HasWorkerInjector {
    AndroidInjector<Worker> workerInjector();
}

## MyApplication.java
public class MyApplication extends MultiDexApplication implements HasWorkerInjector {

    @Inject DispatchingAndroidInjector<Worker> workerDispatchingAndroidInjector;

    public AppComponent appComponent;

    @Override
    public void onCreate() {
        super.onCreate();
        MultiDex.install(this);
        appComponent = DaggerAppComponent
                .builder()
                .application(this)
                .build();
        appComponent.inject(this);

        //Call the Profile Worker
        OneTimeWorkRequest refreshProfile =
        new OneTimeWorkRequest.Builder(ProfileWorker.class)
                .addTag(ConstantsUtils.TAG_OUTPUT)
                .build();
        WorkManager.getInstance().enqueue(refreshProfile);
    }

    @Override
    public AndroidInjector<Activity> activityInjector() {
        return dispatchingAndroidInjector;
    }


    @Override
    public AndroidInjector<Worker> workerInjector() {
        return workerDispatchingAndroidInjector;
    }
}

## ProfileWorker.java
public class ProfileWorker extends Worker {

    @Inject
    SomeClass clazz;

    @NonNull
    @Override
    public WorkerResult doWork() {
        AndroidWorkerInjection.inject(this);
        // Do work here :
        return WorkerResult.SUCCESS;
    }
}

## ProfileWorkerModule.java
@Subcomponent
public interface ProfileWorkerModule extends AndroidInjector<ProfileWorker> {

    @Subcomponent.Builder
    abstract class Builder extends AndroidInjector.Builder<ProfileWorker>{}
}

## WorkerKey.java
@Documented
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@MapKey
public @interface WorkerKey {
    Class<? extends Worker> value();
}

## WorkerModule.java
@Module(subcomponents = {
        ProfileWorkerModule.class,
        UploadWorkerModule.class
})
public abstract class WorkerModule {

    @Binds
    @IntoMap
    @WorkerKey(ProfileWorker.class)
    abstract AndroidInjector.Factory<? extends Worker> bindProfileWorkerFactory(ProfileWorkerModule.Builder profileWorker);
}