Question

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我有一个RecyclerView，其中显示了来自不同子集合的很多照片。我只想在用户longclick可以编辑或删除时，从Firesbase Storage获得照片的引用，并在其上附加uid。因此，如果文档上的uid ==当前用户uid 他可以删除或编辑。问题是我无法到达照片的路径，因为它是从不同的子集合中获取的！请你能帮我吗？

科特琳

class ViewHolder(view: View, var my_data: Data? = null) : RecyclerView.ViewHolder(view) {
        init {
            view.setOnClickListener {
                val intent = Intent(view.context, More::class.java)
                intent.putExtra("description", my_data?.description)
                intent.putExtra("photo", my_data?.photo_uri)
                intent.putExtra("site", my_data?.site)
                view.context.startActivity(intent)
            }

            view.setOnLongClickListener {
                val popUp = PopupMenu(view.context, it)
                popUp.inflate(R.menu.edit_delete)
                popUp.setOnMenuItemClickListener { item ->
                    when (item.itemId) {
                        R.id.edit -> {
                            true
                        }
                        R.id.delete -> {

                            var dp: FirebaseFirestore = FirebaseFirestore.getInstance()
                            dp.collection("Fraise")
                                    .document()
                                    .delete()
                                    .addOnCompleteListener {
                                    }
                            Toast.makeText(view.context, "Note has been deleted!", Toast.LENGTH_SHORT).show()
                            true
                        }
                        else -> false  }
                popUp.show(); true
            }

Answer 1

假设您保持数据库结构与其他question的位置（我为您提供了答案）并且您正在使用名为Fraise的模型类来删除/编辑特定用户的照片，请使用以下代码：

val uid = FirebaseAuth.getInstance().currentUser!!.uid
val rootRef = FirebaseFirestore.getInstance()
val query = rootRef.collection("Fraise").whereEqualTo("uid", uid)
query.get().addOnCompleteListener(OnCompleteListener<QuerySnapshot> { task ->
    if (task.isSuccessful) {
        for (document in task.result) {
            val fraise = document.toObject(Fraise::class.java!!)
            fraise!!.setPhoto_url(new_photo_uri)
            rootRef.collection("Fraise").document(document.id).set(fraise)
        }
    }
})

如果没有模型类，则可以使用Map进行更新，如下所示：

val uid = FirebaseAuth.getInstance().currentUser!!.uid
val rootRef = FirebaseFirestore.getInstance()
val query = rootRef.collection("Fraise").whereEqualTo("uid", uid)
query.get().addOnCompleteListener(OnCompleteListener<QuerySnapshot> { task ->
    if (task.isSuccessful) {
        for (document in task.result) {
            val new_photo_uri = HashMap<String, Any>()
            new_photo_uri["photo_uri"] = new_photo_uri
            rootRef.collection("Fraise").document(document.id).set(new_photo_uri, SetOptions.merge())
        }
    }
})

如何访问文档的随机ID附加文档的字段？

1 个答案: