gridview.setAdapter(new ImageAdapter(getActivity(), responseList));

private void getImages(){
        String BASE_URL = IMAGES_URL + userDetails.getUID();


        JsonObjectRequest jsonObjReq = new JsonObjectRequest(
                Request.Method.GET,BASE_URL, null,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        try{


                            JSONArray listArray = response.getJSONArray("images");
                            images = new String[listArray.length()];
                            for(int i = 0; i <= listArray.length();i++)
                            {
                                JSONObject row = listArray.getJSONObject(i);

                                String name = row.getString("image_url");

                                responseList.add(name);

                                Log.d(TAG, responseList.toString());

                            }
                            gridview.setAdapter(new ImageAdapter(getActivity(), responseList));


                        } catch (JSONException e)
                        {

                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.d(TAG, "Error: " + error.getMessage());


            }
        });

        VolleyRequestQueue.getInstance(getActivity()).addToRequestQueue(jsonObjReq);
    }

package uk.co.ryanmoss.footballgroundguide_android;

/**
 * Created by ryanmoss on 28/03/2017.
 */

import android.content.Context;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

import com.squareup.picasso.Picasso;

import java.util.ArrayList;

public class ImageAdapter extends BaseAdapter {
    private Context mContext;
    private ArrayList<String> imageUrls;


    public ImageAdapter(Context c, ArrayList<String> imageUrls) {
        mContext = c;
        this.imageUrls = imageUrls;


    }

    public int getCount() {
        return imageUrls.size();
    }

    public String getItem(int position) {
        return imageUrls.get(position);
    }

    public long getItemId(int position) {
        return 0;
    }

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {
            // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(8, 8, 8, 8);
        } else {
            imageView = (ImageView) convertView;
        }

        Picasso picasso = Picasso.with(mContext);
        picasso.setIndicatorsEnabled(true);
        picasso.setLoggingEnabled(true);

        String url = getItem(position);

        Picasso
                .with(mContext)
                .load(getItem(position))
                .rotate(90f)
                .into(imageView);
        return imageView;
    }



}