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gistfile1.txt

 Intent intent = new Intent(activity, PhotoPagerActivity.class);

                        ArrayList<String> urls = new ArrayList<>();
                        String imageUrl = dataObj.optString("url");
                        urls.add(0, imageUrl);

                        intent.putExtra("current_item", 1);
                        intent.putStringArrayListExtra("photos", urls);

                        activity.startActivity(intent);