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com.google.firebase.database.DatabaseException:无法将java.lang.Boolean类型的值转换为String这是怎么回事?

firebase-realtime-database firebase android java

0

Jakub Olszewski · 技术社区 · 2 年前

该应用程序运行良好,但当我启动给定的活动时,它开始崩溃

private void loadSpins() {
    reference.child(FirebaseAuth.getInstance().getUid()).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot snapshot) {
            UserModelTask modelTask = snapshot.getValue(UserModelTask.class);
            if (snapshot.exists()) {
                currentSpin = modelTask.getSpins();
                binding.currentSp.setText(String.valueOf(currentSpin));
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });
}

FATAL EXCEPTION: main Process: com.example.cashapp, PID: 1777 com.google.firebase.database.DatabaseException: Failed to convert value of type java.lang.Boolean to String at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertString(CustomClassMapper.java:426) at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass(CustomClassMapper.java:217) at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToType(CustomClassMapper.java:179) at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$100(CustomClassMapper.java:48) at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.deserialize(CustomClassMapper.java:593) at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.deserialize(CustomClassMapper.java:563) at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertBean(CustomClassMapper.java:433) at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass(CustomClassMapper.java:232) at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertToCustomClass(CustomClassMapper.java:80) at com.google.firebase.database.DataSnapshot.getValue(DataSnapshot.java:202) at com.example.cashapp.SpinnerActivity$3.onDataChange(SpinnerActivity.java:191) at com.google.firebase.database.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:75) at com.google.firebase.database.core.view.DataEvent.fire(DataEvent.java:63) at com.google.firebase.database.core.view.EventRaiser$1.run(EventRaiser.java:55) at android.os.Handler.handleCallback(Handler.java:942) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loopOnce(Looper.java:201) at android.os.Looper.loop(Looper.java:288) at android.app.ActivityThread.main(ActivityThread.java:7872) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

此代码的UserModelTask.class

public class UserModelTask {
    private int scratch, spins;
    private String referCode, redeemStatus;

    public UserModelTask(int spins, String scratch, String referCode, String redeemStatus) {
        this.spins = spins;
        this.referCode = referCode;
        this.redeemStatus = redeemStatus;
    }

    public UserModelTask() {
    }

    public int getSpins() {
        return spins;
    }

    public void setSpins(int spins) {
        this.spins = spins;
    }
    public String getReferCode() {
        return referCode;
    }
    public String getRedeemStatus() {
        return redeemStatus;
    }

    public void setRedeemStatus(String redeemStatus) {
        this.redeemStatus = redeemStatus;
    }

    public void setReferCode(String referCode) {
        this.referCode = referCode;
    }    
}

正如我之前所说,它工作正常,现在它开始压垮我,即使我重置了数据库

到底发生了什么,我应该怎么做

2 回复 | 直到 2 年前

1

0

Frank van Puffelen 2 年前

这个 redeemStatus 数据库屏幕截图中的值是布尔值,但在 UserModelTask 类中定义为字符串。Firebase SDK正在寻找布尔字段/属性 赎回状态 ,并且由于类中的字段与类型不匹配,因此会引发错误。

解决方案是修改Java类以匹配数据库中的类型,或者修改数据库以匹配代码中的类型。最后一个是最简单的,因为您可以将数据库更改为:

redeemStatus: "false"

如果你想修改代码,那就是:

public class UserModelTask {
    private int scratch, spins;
    private String referCode;
    private bool redeemStatus; // ð

    public UserModelTask(int spins, String scratch, String referCode, bool redeemStatus) { // ð
        this.spins = spins;
        this.referCode = referCode;
        this.redeemStatus = redeemStatus;
    }

    public UserModelTask() {
    }

    public int getSpins() {
        return spins;
    }

    public void setSpins(int spins) {
        this.spins = spins;
    }
    public String getReferCode() {
        return referCode;
    }
    public bool getRedeemStatus() { // ð
        return redeemStatus;
    }

    public void setRedeemStatus(bool redeemStatus) { // ð
        this.redeemStatus = redeemStatus;
    }

    public void setReferCode(String referCode) {
        this.referCode = referCode;
    }    
}

2

0

Rester 2 年前

你确定吗

snapshot.getValue(UserModelTask.class)

? 我不确定你是否能得到标准类型以外的类型,比如布尔字符串。。。来自火球