首先,我认为我在项目后期才开始使用 Firebase 是我的错。
无论如何,我想要做的是将 Pub 对象存储到数据库中。它包含各种信息,例如开放时间、评级、设施等。
问题不在于存储,而是每当我尝试从数据库中获取酒吧列表时,我都会遇到这个问题
这是错误。
com.google.firebase.database.DatabaseException: Could not find enum value of com.example.matasolutions.pintindex.Day for value "Monday"
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToEnum(com.google.firebase:firebase-database@@16.1.0:302)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass(com.google.firebase:firebase-database@@16.1.0:212)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToType(com.google.firebase:firebase-database@@16.1.0:178)
这是枚举类。
public enum Day {
MONDAY,TUESDAY,WEDNESDAY,THURSDAY,FRIDAY,SATURDAY,SUNDAY
};
这就是带有枚举的构造函数的样子
public SingleOpeningHours(Day dayOfTheWeek,String openingTime, String closingTime){
this.dayOfTheWeek = dayOfTheWeek;
this.openingTime = openingTime;
this.closingTime = closingTime;
}
最后,这就是将其添加到列表然后添加到数据库的方式。
ArrayList<SingleOpeningHours> singleOpeningHours = new ArrayList<SingleOpeningHours>();
singleOpeningHours.add(new SingleOpeningHours(Day.MONDAY, "09:00", "00:00"));
singleOpeningHours.add(new SingleOpeningHours(Day.TUESDAY, "09:00", "01:00"));
singleOpeningHours.add(new SingleOpeningHours(Day.WEDNESDAY, "09:00", "01:00"));
singleOpeningHours.add(new SingleOpeningHours(Day.THURSDAY, "09:00","01:00"));
singleOpeningHours.add(new SingleOpeningHours(Day.FRIDAY, "09:00", "01:00"));
singleOpeningHours.add(new SingleOpeningHours(Day.SATURDAY, "09:00", "01:00"));
singleOpeningHours.add(new SingleOpeningHours(Day.SUNDAY, "09:00", "01:00"));
编辑:我有 7 个与存储的对象关联的枚举类。对此最好的解决方法是什么?提前感谢大家
最佳答案
Firebase 数据库不支持枚举数据类型。要了解有关支持的数据类型的更多信息,请查看 Supported data types
解决方案1:(最简单) 只需使用字符串表示日期而不进行枚举
将 dayOfTheWeek 更改为字符串
String dayOfTheWeek; // Changed from Day to String
public SingleOpeningHours(String dayOfTheWeek,String openingTime, String closingTime){
this.dayOfTheWeek = dayOfTheWeek;
this.openingTime = openingTime;
this.closingTime = closingTime;
}
并在 singleOpeningHours 列表中使用字符串,如下所示,
ArrayList<SingleOpeningHours> singleOpeningHours = new ArrayList<SingleOpeningHours>();
singleOpeningHours.add(new SingleOpeningHours("MONDAY", "09:00", "00:00"));
singleOpeningHours.add(new SingleOpeningHours("TUESDAY", "09:00", "01:00"));
解决方案2:将SingleOpeningHours对象中使用的dayOfTheWeek更改为字符串,并使用Enum类中的name()方法将枚举值转换为字符串
String dayOfTheWeek; // Changed from Day to String
String openingTime;
String closingTime;
public SingleOpeningHours(Day dayOfTheWeek,String openingTime, String closingTime){
this.dayOfTheWeek = dayOfTheWeek.name(); // make sure add .name()
this.openingTime = openingTime;
this.closingTime = closingTime;
}
并在 singleOpeningHours 列表中使用枚举 Day(此处没有更改)
ArrayList<SingleOpeningHours> singleOpeningHours = new ArrayList<SingleOpeningHours>();
singleOpeningHours.add(new SingleOpeningHours(Day.MONDAY, "09:00", "00:00"));
singleOpeningHours.add(new SingleOpeningHours(Day.TUESDAY, "09:00", "01:00"));
希望这些解决方案能够帮助您解决问题
关于java - 在 Firebase 中存储/检索枚举的解决方法是什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55465162/