code: public void onAttach() {
  		for (MvpPresenter<? super Delegated> presenter : mPresenters) {
  			if (mIsAttached && presenter.getAttachedViews().contains(mDelegated)) {
  				continue;
  			}
  
  			presenter.attachView(mDelegated);
  		}
  
  		for (MvpDelegate<?> childDelegate : mChildDelegates) {
  			childDelegate.onAttach();
  		}
  
  		mIsAttached = true;
  	}
docs: <p>Attach delegated object as view to presenter fields of this object.
  If delegate did not enter at {@link #onCreate(Bundle)}(or
  {@link #onCreate()}) before this method, then view will not be attached to
  presenters</p>