How to use AutoCompleteTextView with RecyclerView.Adapter but not with ArrayAdapter in android

Question

I have a condition where auto suggest need to be implemented. For that purpose, I have been trying to use the custom RecyclerView.Adapter.But the problem is,AutoCompleteTextView

Answer 1

AutoCompleteTextView requires a ListAdapter that is also Filterable. You can implement this by having a wrapper class around a RecyclerView.Adapter that extends BaseAdapter and delegates calls to the underlying RecyclerView.Adapter. Here's an example:

public class RecyclerBaseAdapter 
    extends BaseAdapter implements Filterable {

    private final RecyclerView.Adapter mAdapter;

    public RecyclerBaseAdapter(RecyclerView.Adapter adapter) {
        mAdapter = adapter;
    }

    @Override
    public int getItemViewType(int position) {
        return mAdapter.getItemViewType(position);
    }

    @Override
    public int getCount() {
        return mAdapter.getItemCount();
    }

    @Override
    public Object getItem(int position) {
        // not supported
        return null;
    }

    @Override
    public long getItemId(int position) {
        return mAdapter.getItemId(position);
    }

    @SuppressWarnings("unchecked")
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        VH holder;
        if (convertView == null) {
            holder = mAdapter.createViewHolder(parent, getItemViewType(position));
            convertView = holder.itemView;
            convertView.setTag(holder);
        } else {
            holder = (VH) convertView.getTag();
        }
        mAdapter.bindViewHolder(holder, position);
        return holder.itemView;
    }

    @Override
    public Filter getFilter() {
        // TODO: return a real filter
        return null;
    }
}

Now you can do mAutoCompleteTextView.setAdapter(new RecyclerBaseAdapter(mRecyclerViewAdapter)). I only tested this on a Spinner, but it should also work for your case.