我有一个 Firestore 集合,其中每个文档都有一个与之关联的图像,该图像存储在 Firebase 存储中。以前我存储图像引用并通过它检索图像,但由于每次调用都需要一些时间,我尝试切换到存储 downloaduri 以便使用 picasso 我可以通过 downloaduri 引用它而不必每次都检索 downloaduri元素。但是,当我尝试在 getdownloaduri 的 on success 监听器中写入文档时,我收到一个错误指示对象循环。
如果我不包含对数据库的更新,代码能够成功检索 downloaduri 并将其传递给 recyclerview 并显示图像,只有在尝试将其上传到数据库时我才会得到这个错误。我已经尝试在 dowonloadUri.addonsuccesslistenr 之外更新数据库,但是我在监听器中设置的值永远不会在监听器之外更新。
if(menucarditem.dluri == null)
{
val storageRef = storage.reference
val pathReference = storageRef.child(menucarditem.img)
pathReference.downloadUrl.addOnSuccessListener {
menucarditem.dluri = it
dbMealItem.dluri = it
db.collection("menuitems").document(dbMealItem.CatererId + dbMealItem.name).set(dbMealItem).addOnSuccessListener { }
.addOnFailureListener { }
viewAdapter.notifyDataSetChanged()
}
.addOnFailureListener{
Toast.makeText(this, "Image from database not found", Toast.LENGTH_LONG).show()
Log.w(TAG, "Error getting documents: ", it)
}
}
运行时输出的错误是:
E/AndroidRuntime: java.lang.IllegalArgumentException: Could not serialize object. Exceeded maximum depth of 500, which likely indicates there's an object cycle (found in field 'dluri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonicalUri.canonica
等等
最佳答案
问题出在数据类型 Uri downloadUri = task.getResult();
返回 uri 中。但可能在 firestore DB 中需要字符串。因此,在更新到 firestore 之前,将 downloadUri 更改为字符串:
Uri downloadUri = task.getResult();
String uri = downloadUri.toString();
db.collection("menuitems").document(dbMealItem.CatererId + dbMealItem.name).set(**uri**);
关于android - 尝试将 downloadUri 添加到 Firestore 文档时出错。 "Could not serialize object. Exceeded maximum depth of 500",我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56138163/