[Solved] Android App crashed with parse in a for loop

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Make a check for parseObjects == null as i believe you are getting parseObjects as null.

qp.findInBackground(new FindCallback<ParseObject>() {
                    @Override
                    public void done(List<ParseObject> parseObjects, ParseException e) {
                        if (e != null)
                            e.printStackTrace();
                      if(parseObjects!=null)
                         {
                        for (int i = 0; i < parseObjects.size(); i++) {
                            Photo pp = new Photo();
                            ParseObject o = parseObjects.get(i);
                            pp.isActive = true;
                            pp.place = o.getString(Photo.PLACE);
                            ParseFile f = o.getParseFile(Photo.PHOTO);
                            pp.url = f.getUrl();
                            p.photos.add(pp);
                          }
                        Photo.increaseDownloaded();
                        }
                        else 
                        { // Toast here  
                        }
                    }
                });

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solved Android App crashed with parse in a for loop