我的班级是CredicardinfoObject.class
public class CreditcardinfoOjbect implements Serializable {
private static final long serialVersionUID = 1L;
public static String title;
public static String startTime;
public static String endTime;
public static String day;
}
这个类只有静态的特性.没有实例化需要.
在我的mainActivity.class中,我想设置类的值,然后存储此firebase数据库.这是我的mainActivity.class.
CreditcardinfoOjbect.title = "foo";
CreditcardinfoOjbect.startTime = "bar";
CreditcardinfoOjbect.day = "1";
CreditcardinfoOjbect.endTime = "2";
final FirebaseDatabase database = FirebaseDatabase.getInstance();
String uid = "";
FirebaseAuth auth = FirebaseAuth.getInstance();
FirebaseUser user = auth.getCurrentUser();
if (user != null) {
uid = user.getUid();
}
DatabaseReference ref = database.getReference("users").child(uid).child("account").child("creditcards");
HashMap不幸的是,这不起作用.如何在Firebase中存储类的当前值？
最佳答案
首先,您需要添加到您的pojo类,Firebase需要的无参数构造,以及每个字段的公共setter和公共getter,如下所示：
public class CreditCardInfoObject implements Serializable {
private String title;
privat eString startTime;
private String endTime;
private String day;
public CreditCardInfoObject() {}
public String getTitle() {return title;}
public void setTitle(String title) {this.title = title;}
public String getStartTime() {return startTime;}
public void setStartTime(String startTime) {this.startTime = startTime;}
public String getEndTime() {return endTime;}
public void setEndTime(String endTime) {this.endTime = endTime;}
public String getDay() {return day;}
public void setDay(String day) {this.day = day;}
}
请注意,您不需要静态字段.另请注意,我将您的所有字段设置为私有.将这些字段设置为公共字段是一种非常糟糕的做法.
现在,要设置pojo类的值,需要创建CreditCardInfoObject类的新对象并使用公共setter.拥有此新对象后,您可以将其保存到Firebase数据库,如下所示：
CreditcardinfoOjbect obj = new CreditcardinfoOjbect();
obj.setTitle("foo");
obj.setStartTime("bar");
obj.setEndTime("1");
obj.setDay("2");
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
String uid = "";
FirebaseAuth auth = FirebaseAuth.getInstance();
FirebaseUser user = auth.getCurrentUser();
if (user != null) {
uid = user.getUid();
}
DatabaseReference ref = rootRef.child("users").child(uid).child("account").child("creditcards");
ref.setValue(obj);
