Question

我的问题非常简单明了。我已经从firestore cloud-firestore数据库中获取了数据，在AutoCompleteTextView中建议它很好，并且可单击。但是，我想获取所选项目的firebase cloud-firestore文档ID。经过烘烤的测试

private var autoComplete: ArrayAdapter<String>? = null
private var itemId: String? = null

override fun onCreate(savedInstanceState: Bundle?) {
    readData(object: MyCallback {
        override fun onCallback(value: ArrayAdapter<String>) {
            Log.d(TAG, "The list has: " + value.count.toString() + " items.")
        }
    })

    textCurrentSearch.setAdapter(autoComplete)

    textCurrentSearch.onItemClickListener = OnItemClickListener { parent, view, position, id ->

        showShortToast(this@NewOrderActivity, "Item on cloud-firestore id: " + itemId!! + "Item on ArrayAdapter id: " + id)
    }
}

fun showShortToast(context: Context, message: String) {
    Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
}

private fun readData(myCallback : MyCallback) {
    Log.d(TAG, "Before attaching the listener!")

    mFirebaseFirestore.collection("tblProductItems").get().addOnCompleteListener { task ->
        if (task.isSuccessful) {
            Log.d("TAG", "Inside onComplete function!")
            for (document in task.result!!) {
                val name = document.data["name"].toString()

                itemId = document.id

                autoComplete?.add(name)
            }

            myCallback.onCallback(autoComplete!!)

        } else showShortToast(this@NewOrderActivity, task.exception!!.toString())
    }.addOnSuccessListener {
        showShortToast(this@NewOrderActivity, "")
    }

    Log.d(TAG, "After attaching the listener!")
}

interface MyCallback {
    fun onCallback(value: ArrayAdapter<String>)
}

我尝试过

itemId = suggestSnapshot.id

，但无法获取所选产品项重复项的ID。请提供有益的帮助，谢谢。

Answer 1

要解决此问题，请移动设置添加适配器的行，并在回调内部附加列表程序，如下所示：

override fun onCreate(savedInstanceState: Bundle?) {
    mFirebaseFirestore.collection("tblProductItems").addSnapshotListener { querySnapshot, exception ->
        if (exception != null) {
            showShortToast(this@NewOrderActivity, exception.toString())
        }

        for (suggestSnapshot in querySnapshot!!.documents) {
            val suggestion = suggestSnapshot.getString("name")

            itemId = suggestSnapshot.id

            //Add the retrieved string to the list
            autoComplete?.add(suggestion)
        }
        textCurrentSearch.setAdapter(autoComplete)
        textCurrentSearch.onItemClickListener = OnItemClickListener { parent, view, position, id ->
            showShortToast(this@NewOrderActivity, "Item on cloud-firestore id: " + itemId!! + "Item on ArrayAdapter id: " + id)
        }
    }
}

Firebase API是异步的，这意味着只有在等待数据时数据才可用。有关更多信息，建议您也从此 post 中查看我的答案。

从autocompletetextview onItemClickListener项目获取Firestore文档ID

1 个答案: