Firebase 클래스에 직렬화 할 속성이 없습니다.

Firebase 클래스에 직렬화 할 속성이 없습니다.

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Firebase 데이터베이스를 만드는 중입니다.

클래스를 모델링하려고합니다. 매우 간단한 수업 :

package com.glups.model;

import com.google.firebase.database.IgnoreExtraProperties;

@IgnoreExtraProperties
public class AlumnoFB {

    private String nombre;
    private String apellidos;
    private String telefono;
    private String email;
    private Boolean tieneWhatsapp;
    private Boolean tieneTelegram;
    private Boolean tieneHangouts;
    private Long formaPago;
    private Double ratioHora;
    private Double precioHora;
    private Double horasCompensadas;

    public AlumnoFB() {
        // Default constructor required for calls to DataSnapshot.getValue(User.class)
    }

    public AlumnoFB(String nombre,
                    String apellidos,
                    String telefono,
                    String email,
                    Boolean tieneWhatsapp,
                    Boolean tieneTelegram,
                    Boolean tieneHangouts,
                    Long formaPago,
                    Double ratioHora,
                    Double precioHora,
                    Double horasCompensadas) {
        this.nombre = nombre;
        this.apellidos = apellidos;
        this.telefono = telefono;
        this.email = email;
        this.tieneWhatsapp = tieneWhatsapp;
        this.tieneTelegram = tieneTelegram;
        this.tieneHangouts = tieneHangouts;
        this.formaPago = formaPago;
        this.ratioHora = ratioHora;
        this.precioHora = precioHora;
        this.horasCompensadas = horasCompensadas;
    }
}

Firebase의 샘플 클래스와 거의 같습니다.

getUser ()에서 얻은 애플리케이션 사용자가 Firebase에 로그인되었습니다.

SetValue를 호출 할 때 :

AlumnoFB alumno = new AlumnoFB("", "", "", "", false, false, false, ((Integer)FormaPago.INT_NO_PAGADO).longValue(), 0.0, 0.0, 0.0);
    mDatabase.child("AlumnoFB").child(ControlClasesFirebase.getUser().getUid()).setValue(alumno) ;

치명적인 예외가 발생합니다.

06-10 10:17:37.179 13841-13841/com.glups.controlclases E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.glups.controlclases, PID: 13841 com.google.firebase.database.DatabaseException: No properties to serialize found on class com.glups.model.AlumnoFB
at com.google.android.gms.internal.zzaix$zza.<init>(Unknown Source)
at com.google.android.gms.internal.zzaix.zzj(Unknown Source)
at com.google.android.gms.internal.zzaix.zzaw(Unknown Source)
at com.google.android.gms.internal.zzaix.zzav(Unknown Source)
at com.google.firebase.database.DatabaseReference.zza(Unknown Source)
at com.google.firebase.database.DatabaseReference.setValue(Unknown Source)
at com.glups.controlclases.MainActivity$4.onClick(MainActivity.java:305)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5258)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

유형을 확인했으며 모두 허용됩니다. 뭐가 문제 야?

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Firebase는 Pojo에 공개 변수 또는 getter / setter 가 있어야합니다 .

변수 선언을 공용으로 변경

public String nombre;
public String apellidos;
public String telefono;
public String email;
public Boolean tieneWhatsapp;
public Boolean tieneTelegram;
public Boolean tieneHangouts;
public Long formaPago;
public Double ratioHora;
public Double precioHora;
public Double horasCompensadas;

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Proguard를 사용하는 경우 구성에 따라 모델의 일부 방법이 제거 될 수 있습니다. getter 및 / 또는 (선택적으로) setter가있는 필드 만 있으므로 POJO에 대한 최적화가 많지 않다는 것을 알고 있으므로 "@Keep"주석을 사용하여 proguard가이 클래스에서 메서드를 삭제하지 않도록 할 수 있습니다.

Check this for more info: https://developer.android.com/studio/build/shrink-code.html

@Keep
public class Store {}

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In my case I forgot to add a proguard rule to keep the model classes:

-keep class com.google.firebase.example.fireeats.model.** { *; }

This is same as @aselims's answer, just proguard version.

I found it in the official firestore example:

https://github.com/firebase/quickstart-android/blob/master/firestore/app/proguard-rules.pro

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I have got this issue today and just resolve this providing getter/setter for private variables.

ex:

private String pid;

public String getPid() {
    return pid;
}

public void setPid(String pid) {
    this.pid = pid;
}

Now it's work perfectly without any error. Hope it will help newbies devs.

참고URL : https://stackoverflow.com/questions/37743661/firebase-no-properties-to-serialize-found-on-class