java - 如何删除parse.com类中数组类型对象中的值

Question

我有一个名为“UserData”的解析类，包含一个数组类型的列名“usersports”，我在该数组中成功添加了值，现在每当我插入一个新条目

login_data.addAllUnique("usersports",selected_sport_list);

其中selected_sport_list是我包含运动的数组列表，login_data是解析对象

    private class SaveUserDataToParse extends AsyncTask<String, String, String> {
            private Context context;
            private ProgressDialog progressDialog;

            public SaveUserDataToParse(Context context) {
                this.context = context;
            }
            @Override
            protected void onPreExecute() {
                progressDialog = new ProgressDialog(context);
                progressDialog.setMessage("Loading...");
                progressDialog.show();
            }
            @Override
            protected String doInBackground(String... params) {
                try {
                    //Do your loading here
                     ParseQuery<ParseObject> query = ParseQuery.getQuery(Sportapp.USERDATA);
                     query.whereEqualTo(Sportapp.USER_GOOGLE_ID, google_id_from_preference.trim());
                     ParseObject login_data = query.getFirst();

                     if (login_data != null)  {

                          login_data.put(Sportapp.USER_CITY, User_city);
                          login_data.put(Sportapp.USER_STATE, User_state);
                          login_data.put(Sportapp.USER_COUNTRY, User_country);

                          if(!selected_sport_list.isEmpty()){
                            login_data.addAllUnique(Sportapp.USER_SPORTS,selected_sport_list);


                              //login_data.removeAll(Sportapp.USER_SPORTS,selected_sport_list);
                          }
                          login_data.saveInBackground();
                     }
                } catch (ParseException e) {
                    e.printStackTrace();
                }
                return "finish";
            }

            @Override
            protected void onPostExecute(String result) {
                progressDialog.dismiss();

                Toast.makeText(getApplicationContext(), "Your Data has been successfully Saved", Toast.LENGTH_SHORT).show();
            }
        }

由于我陷入困境，使用上面的代码我可以在解析数组中添加数据。 但是执行这段代码我必须在解析时删除数组的包含数据。

Answer 1

删除代码中的这一行:- login_data.addAllUnique(Sportapp.USER_SPORTS,selected_sport_list);

并添加以下内容:- login_data.put(Sportapp.USER_SPORTS,selected_sport_list);