How to change the color of selected item and when using Firebase Recycler Adapter?

Question

I'm using the Firebase RecyclerAdapter to display a list of things. How do I change the colour of all the items in the RecyclerView except the selected item back to a different colour? Changing the colour of the selected item is straightforward.

 FirebaseRecyclerAdapter<Home_List, SubChatHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Home_List, SubChatHolder>(

                Home_List.class,
                R.layout.single_division_layout,
                SubChatHolder.class,
                ref

        ) {
            @Override
            protected void populateViewHolder(final SubChatHolder viewHolder, final Home_List model, int position) {

                final String id = getRef(position).getKey();

                viewHolder.setName(model.getName());

                viewHolder.mView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                       mView.viewHolder.setSelectedBg();
                       //how to uncolour the previously selected item?
                    }
                });
            }
        };

Primož Ivančič · Accepted Answer · 2020-07-09T20:41:29.337

1

How are you selecting the position? By clicking on the item?

If that's the case, you don't event need the position. All you need to do is to change the (background) color of mView in your onClick method, where your change the color of selected item comment is.

Your problem here is going to be deselection of the item, as it is going to remain colored otherwise. You are going to have to find all the views inside the RecyclerView and reset the background color.

EDIT

Here is the link from comments with one of possible solutions: https://stackoverflow.com/a/40712773/6835732

edited Jul 09 '20 at 20:41

answered Jul 09 '20 at 16:59

Primož Ivančič

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You're right, it's the deselction that I"m unclear about. – Arjun Ram Jul 09 '20 at 17:16
Here is one way to do it: https://stackoverflow.com/a/40712773/6835732 – Primož Ivančič Jul 09 '20 at 17:19
Yes but the firebaserecycleradapter doesn't have the equivalent of a notifyDataSetChanged method right? It just automatically updates the adapter once changes are seen – Arjun Ram Jul 09 '20 at 17:24
Oh, my bad. I'll look into this a bit more. – Primož Ivančič Jul 09 '20 at 17:27
Can you please re-check if notifyDataSetChanged() exists? All the online sources about FirebaseRecyclerAdapter I found, had this method as part of it. Of course, documentation might be old. – Primož Ivančič Jul 09 '20 at 17:33
Okay, will take a look :) Thanks! – Arjun Ram Jul 09 '20 at 17:36

How to change the color of selected item and when using Firebase Recycler Adapter?

1 Answers1