如何使用Mosby将演示者附加到派生控件（视图）上？

Question

I'm otherwise successful using Mosby in my app. I'm now at the point where I'd like to add a presenter to a NavigationView control. I've overridden the control to encapsulate view-ish things such as adding menu items and dynamically appearing child controls.

I would now like to move all of the presenter-ish code from the MainActivity.java into a NavigationDrawerPresenter class and I'd like to use Mosby.

I've read through the Mosby docs and I didn't see where it explains how to attach a presenter to a View control that I've extended from the SDK that is sitting deep inside of a Activity layout. I gathered that I could use the ViewGroupMvpDelegateImpl directly and manually delegate all of the lifecycle events from the view to the delegate. (Is this the right way?)

In the case of the NavigationView , this is problematic.

NavigationView inherits from ScrimInsetsFrameLayout . It doesn't let us override onAttachedToWindow or onDetachedFromWindow . It responds with:

ScrimInsetsFrameLayout.onAttachedToWindow can only be called from within the same library group (groupId=com.android.support)

This seems to be a showstopper for Mosby. Without this override, I don't know how to attach Mosby's delegate to the lifecycle events.

How do I attach a presenter to a view that I have extended from the Android SDK?

    public class NavigationDrawerView extends NavigationView
        implements NavigationDrawerContract.View,
        ViewGroupDelegateCallback<NavigationDrawerContract.View, NavigationDrawerContract.Presenter>, MvpView,
        NavigationView.OnNavigationItemSelectedListener {

    protected ViewGroupMvpDelegate<NavigationDrawerContract.View, NavigationDrawerContract.Presenter> mvpDelegate;
        protected NavigationDrawerContract.Presenter presenter;

    //...

        public NavigationDrawerView(Context context) {
            super(context);
        }

        public NavigationDrawerView(Context context, AttributeSet attrs) {
            super(context, attrs);
        }

        public NavigationDrawerView(Context context, AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
        }

    //...

    @NonNull
        protected ViewGroupMvpDelegate<NavigationDrawerContract.View, NavigationDrawerContract.Presenter> getMvpDelegate() {
            if (mvpDelegate == null) {
                mvpDelegate = new ViewGroupMvpDelegateImpl<>(this, this, true);
            }

            return mvpDelegate;
        }

        @Override
        protected void onAttachedToWindow() {
            super.onAttachedToWindow();
            getMvpDelegate().onAttachedToWindow();
        }

        @Override
        protected void onDetachedFromWindow() {
            super.onDetachedFromWindow();
            getMvpDelegate().onDetachedFromWindow();
        }

    //...
    }

public class NavigationDrawerPresenter
    extends MvpNullObjectBasePresenter<NavigationDrawerContract.View>
    implements NavigationDrawerContract.Presenter {

//...
}

public interface NavigationDrawerContract {
    interface View extends MvpView {
        // ...
    }

    interface Presenter extends MvpPresenter<View> {
        // ...
    }

}

Answer 1

Hmm, I have faced same problem. I think we can use

 addOnAttachStateChangeListener(object : OnAttachStateChangeListener {
        override fun onViewDetachedFromWindow(v: View?) {
            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
        }

        override fun onViewAttachedToWindow(v: View?) {
            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
        }

    })