adapter.java

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.android.lviv.R;
import com.squareup.picasso.Picasso;

import java.util.List;

/**
 * Created by igor on 15.04.16.
 */
public class ImageGridAdapter extends RecyclerView.Adapter<ImageGridAdapter.Holder> {

    private Context context;
    private List<String> image_urls;

    public ImageGridAdapter(Context context, List<String> image_urls) {
        this.context = context;
        this.image_urls = image_urls;
    }


    @Override
    public ImageGridAdapter.Holder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new Holder(LayoutInflater.from(parent.getContext()).inflate(R.layout.image_grid_item, parent, false));
    }

    @Override
    public void onBindViewHolder(Holder holder, int position) {
        String url = image_urls.get(position);
        System.out.println("url =" + url);
        Picasso.with(context)
                .load(url)
                .into(holder.photo);

    }

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

    public class Holder extends RecyclerView.ViewHolder {
        protected ImageView photo;
        public Holder(View itemView) {
            super(itemView);
            photo = (ImageView) itemView.findViewById(R.id.placePhoto);
        }
    }
}