CODEWITHSUNDEEP
javaandroidandroid-recyclerview
Joao Sardinha
Joao Sardinha

Reputation: 3423

Android: invert RecyclerView positions

I'm setting a RecyclerView behaving like a list, I want a button in the bottom of the list that when clicked adds more views, I'm thinking the easier way to do it is to make the position 0 as the first one in the bottom, and increasing the position to the top, so I can add views when the the view in position 0 is clicked. If there is a better aproach for this problem do share.

Here is my adapter:

public class AddEventsAdapter extends RecyclerView.Adapter<AddEventsAdapter.ViewHolder> {

   public List<String> items = new ArrayList<>();



    public void addItem(String name) {
        notifyItemInserted(items.size() - 1);
        items.add(name);

    }

    public void removeItem(int position) {
        items.remove(position);
        notifyItemRemoved(position);
        notifyItemRangeChanged(position, items.size());
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View view = inflater.inflate(R.layout.add_event_item, parent, false);

        return new ViewHolder(view);
    }

    @Override
    public int getItemCount() {
        return items.size();
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.setData(position);
        holder.eventName.setText(i + "");
        if(position == 0)
        {
            holder.theLayout.setBackgroundColor(Color.parseColor("#7F9099"));
            holder.eventName.setText("Add");
        }

    }


    static int i;
    class ViewHolder extends RecyclerView.ViewHolder{

        public TextView eventName;
        public RelativeLayout theLayout;

        public ViewHolder(final View itemView) {
            super(itemView);
            eventName = (TextView)itemView.findViewById(R.id.eventName);
            theLayout = (RelativeLayout)itemView.findViewById(R.id.backgroundevent);

            theLayout.setId(++i);


        }

        public void setData(final int position) {
            theLayout.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (position == items.size() - 1) {
                        addItem("");
                    } else {
                        removeItem(position);
                    }
                }
            });
        }


    }


}

You may notice some errors in that, I've been over it for the last 10 hours and I'm having a logic breakdown

Upvotes: 3

Views: 2096

Answers (2)

Joao Sardinha
Joao Sardinha

Reputation: 3423

It's solved by addind this line to the LayoutManager .setReverseLayout(true);

Upvotes: 9

Shaan_B
Shaan_B

Reputation: 1838

you can add a footer view at the end of the list and inside that you can add your button. This is the link to create a footer in recycler view https://github.com/u3breeze/android-RecyclerView-WithHeaderAndFooter. You can add the views in the normal way

Upvotes: 1

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