Java安卓开发Firebase数据库无法保存音频元数据问题求助

我正在从Firebase Storage下载音频的名称与URL，下载环节执行正常，但对应数据无法上传至Firebase Database。

数据下载上传逻辑

StorageReference reference = storage.getReference().child("Ringtone");
reference.listAll().addOnSuccessListener(listResult -> {
    Log.d("Tag","reference listed");
    for(StorageReference item:listResult.getItems()){
        Task<Uri> downloadUrlTask = item.getDownloadUrl();
        Task<StorageMetadata> downloadNameTask = item.getMetadata();
        Tasks.whenAll(downloadNameTask,downloadUrlTask).addOnSuccessListener(unused -> {
            Methods methods = new Methods();
            methods.firebse_ring_upload(downloadNameTask.getResult().getName(),downloadUrlTask.getResult());
        });
    }
});

Method类代码

package com.example.alarm.Methods;
import android.net.Uri;
import android.util.Log;
import com.example.alarm.Models.RingtoneModel;
import com.google.firebase.database.FirebaseDatabase;
public class Methods {
    FirebaseDatabase database = FirebaseDatabase.getInstance();
    public void firebse_ring_upload(String songName, Uri uri){
        RingtoneModel ringtoneModel = new RingtoneModel(songName,uri.toString());
        database.getReference().child("Ringtones_Room").child(songName.replace(" ","").replaceAll("[\\W+]","")).setValue(ringtoneModel);
    }
}

RingtoneModel（POJO类）代码

package com.example.alarm.Models;
import android.net.Uri;
public class RingtoneModel {
    String SongName;
    String uri;
    public RingtoneModel(String songName, String uri) {
        SongName = songName;
        this.uri = uri;
    }
    public RingtoneModel(){}
    public String getSongName() {
        return SongName;
    }
    public void setSongName(String songName) {
        SongName = songName;
    }
    public String getUri() {
        return uri;
    }
    public void setUri(Uri uri) {
        this.uri = uri.toString();
    }
}

此前代码因尝试直接存储URI对象抛出StackOverflow错误，修改为将URI转成字符串存储后不再抛出任何错误，但数据仍然没有写入数据库。

更新补充 #

我按如下方式修改了Method类中的方法：（method类内）

public void firebse_ring_upload(String songName, Uri uri){
    RingtoneModel ringtoneModel = new RingtoneModel(songName,uri.toString());
    database.getReference("https://alarm-sachinbudak-default-rtdb.asia-southeast1.firebasedatabase.app/").child("Ringtones_Room").child(songName.replaceAll("[\\W+]","")).setValue(ringtoneModel);
}

修改后抛出新的报错：

com.google.firebase.database.DatabaseException: Invalid Firebase Database path: https://alarm-sachinbudak-default-rtdb.asia-southeast1.firebasedatabase.app/. Firebase Database paths must not contain '.', '#', '$', '[', or ']'
            at com.google.firebase.database.core.utilities.Validation.validatePathString(Validation.java:45)
            at com.google.firebase.database.core.utilities.Validation.validateRootPathString(Validation.java:58)
            at com.google.firebase.database.FirebaseDatabase.getReference(FirebaseDatabase.java:181)
            at com.example.alarm.Methods.Methods.firebse_ring_upload(Methods.java:14)
            at com.example.alarm.MainActivity.lambda$onCreate$3(MainActivity.java:85)

1. 路径错误修复 #

getReference()方法仅接收数据库内部的相对路径，不支持传入完整数据库URL，你使用的是非美区节点，需要在初始化FirebaseDatabase实例时传入完整URL：
修改Method类中的数据库初始化代码：

FirebaseDatabase database = FirebaseDatabase.getInstance("https://alarm-sachinbudak-default-rtdb.asia-southeast1.firebasedatabase.app/");

后续调用getReference()时直接传入相对路径Ringtones_Room即可。

2. 无报错也无法写入数据的排查 #

• 检查数据库权限规则，调试阶段可以先开放测试权限验证写入功能：

{
  "rules": {
    ".read": true,
    ".write": true
  }
}

• 给setValue操作添加回调打印错误信息，方便定位具体问题：

database.getReference().child("Ringtones_Room").child(songName.replace(" ","").replaceAll("[\\W+]",""))
.setValue(ringtoneModel)
.addOnSuccessListener(aVoid -> Log.d("DB_WRITE", "写入成功"))
.addOnFailureListener(e -> Log.e("DB_WRITE", "写入失败", e));

• 补充POJO类的setter方法避免序列化异常，新增String参数的setUri方法：

public void setUri(String uri) {
    this.uri = uri;
}

内容的提问来源于stack exchange，提问作者Sachin Burdak