Question

我必须尝试将数据下载到ArrayList中。当我在done（）方法中调用它时它没问题，但是当我在done（）之外调用它时它将为null。我怎么解决它？

        ParseQuery<ParseObject> query = ParseQuery.getQuery("code");
    query.findInBackground(new FindCallback<ParseObject>() {
        public void done(List<ParseObject> provineList, ParseException e) {
            if (e == null) {
                for (ParseObject mProvine : provineList) {
                    Provine provine = new Provine();
                    provine.setPro((String) mProvine.get("provine"));
                    provine.setNumber((String) mProvine.get("code_number"));
                    provines.add(provine);
                    Log.d("All provine", provines.get(i).getPro()); (it's ok, no problem).
                    i++;
                }
            } else
                Log.d("Provines", "Error: " + e.getMessage());
            }
        }
    });
Log.d("All provine", provines.get(0).getPro()); (it's null ).

Answer 1

您可以声明扩展ParseObject。

的子类

在调用ParseObject.registerSubclass(YourClass.class)之前，在Application构造函数中调用Parse.initialize()。

关注此Subclasses https://www.parse.com/docs/android/guide#objects-subclassing-parseobject

      // Armor.java
    import com.parse.ParseObject;
    import com.parse.ParseClassName;

    @ParseClassName("Armor")
    public class Armor extends ParseObject {
    }

    // App.java
    import com.parse.Parse;
    import android.app.Application;

    public class App extends Application {
      @Override
      public void onCreate() {
        super.onCreate();

        ParseObject.registerSubclass(Armor.class);
        Parse.initialize(this, PARSE_APPLICATION_ID, PARSE_CLIENT_KEY);
      }
    }

在查询中，您将该数据作为ArrayList。

ParseQuery<Armor> query = ParseQuery.getQuery(Armor.class);
query.whereLessThanOrEqualTo("rupees", ParseUser.getCurrentUser().get("rupees"));
query.findInBackground(new FindCallback<Armor>() {
  @Override
  public void done(List<Armor> results, ParseException e) {

    // here you can use results same as object model.


  }
});

将数据从Parse.com检索到ArrayList <object>

1 个答案: