Option menu in recycler view adapter

Question

I would like to like to ask you how I call a method in activity from adapter recycler view.

In function buildRecyclerView there is set up the adapter:

private void buildRecyclerView() {
  offerAdapter = new OfferAdapter();
  recyclerView.setAdapter(offerAdapter);
}

In class OfferAdapter.java there is created submenu for each item and with onMenuItemClickListener:

@Override
public void onBindViewHolder(NoteHolder holder, int position) {
PopupMenu popup = new PopupMenu(mCtx, holder.button);
popup.inflate(R.menu.menu);
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
  // TODO here I want to call delete item in MyOfferFragment.java
}

The main question: How I can call from *onMenuItemClickListnere* the function in *MyOfferFragment*.

Thank you very much in advance

please look at it my hope its helpful to you. – Tanveer Munir Jan 23 '19 at 08:17 — Tanveer Munir, Jan 23 '19 at 08:17

Tanveer Munir · Accepted Answer · 2019-01-23T08:15:52.347

You can pass a listener object in the constructor which implements by fragment OR activity

/**
     * item click interface of adapter
     */
    public interface OfferAdapterListener {
        void onItemClick(int position)
    }

This interface implent by fragment

/**
     * On item clicked Implement Method from adapter listener.
     *
     * @param position
     */
    @Override
    public void onItemClick(int position) {
        // Here you can call that method 
    }

then you pass this listener in the constructor of the adapter.

private void buildRecyclerView() {
  offerAdapter = new OfferAdapter(this);
  recyclerView.setAdapter(offerAdapter);
}

In the constructor, you can assign like this

 private OfferAdapterListener mOfferAdapterListener;
 public OfferAdapter(OfferAdapterListener mOfferAdapterListener) {
        this.mOfferAdapterListener = mOfferAdapterListener
        }
    }

Now you can use this listener by setting click listener on anyViwe like this

holder.button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mOfferAdapterListener.onItemClick(position);
            }
        });

It returns to call the method of onItemClick which implements this method.

OR

You can pass activity or fragment context in the constructor like above and call it through by it reference like this

((MainActivity) mActivity).methodName(arguments);

Here is mActivity reference context which you pass through in constructor.

Thank you very much for answer. Which approach is more "professional"? — Marek Vondra, Jan 23 '19 at 09:14
@MarekVondra you can use listener it's easy, safe and more professional and please mark this answer if it's helped you. — Tanveer Munir, Jan 23 '19 at 10:17
Munir : I would like to mark this answer, but your solution not workiing. All cascade is only Overide method a I am not able to change it. — Marek Vondra, Jan 23 '19 at 19:39

score 1 · Answer 2 · answered Jan 23 '19 at 08:04

You can add the MyOfferFragment to your adapter constructor.

private void buildRecyclerView() {
  offerAdapter = new OfferAdapter(this); // Adding fragment to constructor
  recyclerView.setAdapter(offerAdapter);
}

In OfferAdapter.java:

private MyOfferFragment mFragment; // field variable
OfferAdapter (MyOfferFragment fragment){
  mFragment = fragment;
}

You can then access MyOfferFragment methods via mFragment:

  mFragment.deleteItem();

However, I think it is a more conventional way to just move methods related to RecyclerView into the adapter if possible. You can refer to this if you want to delete an item from RecyclerView: Android RecyclerView addition & removal of items

Hello Saran, I would liek to move this method delete in Adapter. But it is not possible, because in method delete I call startActivityForResult.. — Marek Vondra, Jan 23 '19 at 09:16
You can get that method from the fragment that you have passed into the adapter: `mFragment.startActivityForResult(intent, requestCode)` — Sara Tran, Jan 23 '19 at 09:58

Option menu in recycler view adapter

2 Answers2