How to remove items from firebase RecyclerView

Question

I\'m currently working on Adding Friends with the help of firebase RecyclerView in which if a user tap on ADD button, he is added in database n that tapped item is needed to

Answer 1

If you look at this code, it removes a Note from Firebase when the Note is clicked. It seems straight forward if you understand a Firebase query. This will also update the RecyclerView once the RecyclerView adapter is setup correctly. You don't need a List of data, just the value of what you want to remove, like an ID or a key.

       @Override
        public void onLongClick(View v, int i) {
            mquery.orderByChild("text")
                    .equalTo((String) notes.get(i).getName())
                    .addListenerForSingleValueEvent(new ValueEventListener() {
                        public void onDataChange(DataSnapshot dataSnapshot) {
                            if (dataSnapshot.hasChildren()) {
                                DataSnapshot firstChild = dataSnapshot.getChildren().iterator().next();
                                firstChild.getRef().removeValue();
                            }
                        }

                        public void onCancelled(FirebaseError firebaseError) {
                        }
                    });

The FirebaseRecyclerAdapter.class from https://github.com/mmazzarolo/firebase-recyclerview works. I just copied and pasted, for the most part. This is an abstract class you can use to make a RecyclerView adapter for your Firebase database. All the code is on that GitHub repository for you. Here is a snippet from FirebaseRecyclerAdapter.class that removes the value from Firebase AND updates the recyclerView:

    @Override
    public void onChildRemoved(DataSnapshot dataSnapshot) {
        String key = dataSnapshot.getKey();

        if (mKeys.contains(key)) {
            int index = mKeys.indexOf(key);
            T item = mItems.get(index);

            mKeys.remove(index);
            mItems.remove(index);

            notifyItemRemoved(index);
            itemRemoved(item, key, index);
        }
    }

UPDATE: You can hide a view in the Viewholder of the RecyclerView adapter. look at these answers in stackoverflow Hiding views in RecyclerView