Realm - Querying long-type class returns empty

问题

When querying equalTo a field with long type, the RealmResults returns blank. My query code is as below:

_realm.beginTransaction();
long albumID = Long.valueOf(albumId);
results = _realm.where(Image.class).equalTo("albumId",albumID).findAll();
_realm.commitTransaction();

albumId is a string passed by a method

Image class:

public class Image extends RealmObject {
  @PrimaryKey
  private long id;
  private long albumId;
  private String url;
  private int width;
  private int height;
  private long published;

//Setters and getters
}

I tried to query without the equalTo and see that the results contain albumId values

来源：https://stackoverflow.com/questions/30138203/realm-querying-long-type-class-returns-empty