patrykpoborca

public class MyDependency {}

public class MyClass{
   private MyDependency dependency;
   
   //Bad! ex 1
   public MyClass(){
      dependency = new MyDependency();
   }
   

patrykpoborca

@Component(modules = MyModule.class)
public interface MyComponent {
    void inject(MyActivity Activity);
}

patrykpoborca

public static Factory<MainActivityPresenter> create(PresenterModule module, Provider<TwitterApi> twitterApiProvider) {  
  return new PresenterModule_ProvidesMainActivityPresenterFactory(module, twitterApiProvider);
}

patrykpoborca

@Scope
@Retention(RetentionPolicy.RUNTIME)
public @interface ActivityScope {
}

patrykpoborca

@Module
public class AppModule {
    @Provides
    @Singleton
      MyClass providesMyClass(){
        return new MyClass();
    }
}

patrykpoborca

@Component(modules = {AppModule.class, OKModule.class})
@Singleton
public interface BaseComponent {
    MyClass getMyClass();
}

patrykpoborca

    public class MyClass{
        private int type = 0;
        public MyClass(int type){
            this.type = type;
        }
    }

    public class InjectableClass{

        MyClass myClass1;

patrykpoborca

@Override
  public void injectMembers(MainActivity instance) {  
    if (instance == null) {
      throw new NullPointerException("Cannot inject members into a null reference");
    }
    supertypeInjector.injectMembers(instance);
    instance.tweeterApi = tweeterApiProvider.get();
    instance.retrofit = retrofitProvider.get();
  }

patrykpoborca

@SuppressWarnings("unchecked") // cast only happens when result comes from the factory
  @Override
  public T get() {
    // double-check idiom from EJ2: Item 71
    Object result = instance;
    if (result == UNINITIALIZED) {
      synchronized (this) {
        result = instance;
        if (result == UNINITIALIZED) {
          instance = result = factory.get();

patrykpoborca

@Override
  public String get() {  
    String provided = module.providesString();
    if (provided == null) {
      throw new NullPointerException("Cannot return null from a non-@Nullable @Provides method");
    }
    return provided;
  }