无法将java.lang.Long类型的对象转换为java.util.Date类型 [英] Can't convert object of type java.lang.Long to type java.util.Date

问题描述

我正在迁移到Firebase新版本，尝试从快照中获取 getvalue 时，出现以下错误：

  com.google.firebase.database.DatabaseException：无法将java.lang.Long类型的对象转换为类型java.util.Date 
   
 
 
  public void getUpdates（DataSnapshot dataSnapshot）{
 Item item = dataSnapshot.getValue（Item.class）; 
 itemArrayList.add（item）; 
 itemAdapter.refreshItem（itemArrayList）; 
} 
  
我猜这跟Item对象有关系， ，所以我无法弄清楚什么是错的。我确实使用了日期。 
 
 
  Firebase项目结构  
 
 
  
 
 
 
项目对象
 
 
  private字符串标题; 
私有字符串描述; 
私有HashMap< String，ItemPicture> picturesHashMap; 
私人日期publishedDate; 
私人日期deletionDate; 
 private String条件; 
私人字符串传送; 
 private String uid; 
私有int报告; 
私人布尔给定; 
私人位置位置; 
私人字符串frontImage; 
 private String uniqueID; 
  
任何帮助都将得到高度评价。 
 
解决方案
 Firebase不支持 Date 类对象，因此您需要将它们存储为您已经完成的long / timestamp。
 
 
 
  1463845578489 是一个长整型，它需要存储在一个long变量中，而不是一个Date 
 
 <将您的变量声明更改为 
 
 
  private long publishedDate; 
  
然后，将long转换为有效的Date对象，您可以使用这个 
 
 
  Date d = new Date（publishedDate）; 
  
 
I'm migrating to Firebase new version and I get the following error when trying to getvalue from the snapshot
com.google.firebase.database.DatabaseException: Can't convert object of type java.lang.Long to type java.util.Date
This happens when trying to getvalue from the snapshot in the following method
public void getUpdates(DataSnapshot dataSnapshot){
    Item item = dataSnapshot.getValue(Item.class);
    itemArrayList.add(item);
    itemAdapter.refreshItem(itemArrayList);
}
I guess it has something to do with the Item object, but it worked before, so I can't figure out what's wrong. I'm using dates indeed.


Firebase item structure



Item object 
private String title;
private String description;
private HashMap<String, ItemPicture> picturesHashMap;
private Date publishedDate;
private Date deletionDate;
private String condition;
private String delivery;
private String uid;
private int reported;
private boolean given;
private Location location;
private String frontImage;
private String uniqueID;
Any help would be highly appreciated.
解决方案
Firebase doesn't support Date class objects so you need to store them as long/timestamp which you have already done.

1463845578489 is a long which needs to be stored in a long variable and not a Date

change your variable declaration to 
private long publishedDate;
Then to convert long to a valid Date object you can use this 
Date d = new Date(publishedDate);


                        
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