Firebase沒有要在類中找到的序列化屬性

Question

我很生氣創建Firebase數據庫。

我想模擬一個類。一個非常簡單的類：

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; 
    } 
} 

這幾乎就像來自Firebase的示例類。

從getUser（）獲取的應用程序用戶已登錄到Firebase。

當我打電話的SetValue：

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) ; 

嚴重異常升高。

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) 

我檢查過類型，並且都被接受。怎麼了？

Answer 1

Firebase要求您的Pojo擁有公共變量或getter/setter。

變化的變量聲明公共

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; 

Answer 2

如果您使用ProGuard，模型中的一些方法可以根據您的配置被剝離出來。由於我們知道POJO沒有太多優化，因爲它只有getter和/或（可選）setter字段，所以可以使用註釋「@Keep」，這樣proguard不會從該類中刪除任何方法。

檢查本作的詳細信息：https://developer.android.com/studio/build/shrink-code.html

@Keep 
public class Store {} 

Answer 3

在我來說，我忘了補充一個proguard的規則，以保持模型類：

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

這是一樣的@ aselims的回答，只是proguard版本。

我發現它在官方公司的FireStore例如：

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