Firebase抛出No properties to serialize found on class错误如何解决

问题根因 #

Firebase 序列化/反序列化机制仅识别类的非静态实例属性，你提供的NewsModel中所有字段、getter、setter方法均被static关键字修饰，属于类级别的共享属性，不属于实例对象的独有属性，因此序列化时无法扫描到有效可序列化的属性，触发对应报错。

解决方案 #

移除所有字段、getter、setter方法的static修饰符即可，修正后的代码如下：

public class NewsModel implements Serializable {
    public String Title;
    public String Body;
    public String Date;
    public String ID;
    public String Location;
    public String Source;

    public NewsModel(String title, String body, String date, String ID, String location, String source) {
        Title = title;
        Body = body;
        Date = date;
        this.ID = ID;
        Location = location;
        Source = source;
    }

    public NewsModel(){

    }

    public String getTitle() {
        return Title;
    }

    public void setTitle(String title) {
        Title = title;
    }

    public String getBody() {
        return Body;
    }

    public void setBody(String body) {
        Body = body;
    }

    public String getDate() {
        return Date;
    }

    public void setDate(String date) {
        Date = date;
    }

    public String getID() {
        return ID;
    }

    public void setID(String ID) {
        this.ID = ID;
    }

    public String getLocation() {
        return Location;
    }

    public void setLocation(String location) {
        Location = location;
    }

    public String getSource() {
        return Source;
    }

    public void setSource(String source) {
        Source = source;
    }
}

额外注意事项 #

• 需保留public无参构造方法，该方法是Firebase反序列化实例化对象的必要条件
• 如果字段命名和Firebase中存储的key不匹配，可给对应字段添加@PropertyName("Firebase中对应的key名")注解显式映射关系
• 不要给序列化类的字段、存取方法添加static、transient等会影响属性读写的修饰符

内容的提问来源于stack exchange，提问作者Sathishkumar G