Question

所以，我分配了我的var spinner数组来从firestore中的文档中获取数据，但这是我得到的 result 。

这是我目前的活动。如果我分配字符串，我可以使它工作，但最终我想从我的文档中加载数据，就像我现在正在尝试做的那样。

这是我的 firestore 设置。

有什么原因吗？感谢

var db = FirebaseFirestore.getInstance()



var spinnerArray = arrayOf(db.collection("KitList")
           .get()
           .addOnCompleteListener { task ->
               if (task.isSuccessful) {
                   for (document in task.result) {
                       Log.d("weight05", document.id + " => " + document.data)
                   }
               } else {
                   Log.w("error", "Error getting documents.", task.exception)
               }
           })

var newKitList = mutableListOf<String>()

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_new_kit_list)
    var addButton = addKitItemBtn

    val spinner = newKitItemSpinner
    val spinnerArrayAdapter = ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item, spinnerArray)
    //selected item will look like a spinner set from XML
    spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
    spinner.adapter = spinnerArrayAdapter

    val kitList = newKistListView
    val listViewAdapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, newKitList)
    kitList.adapter = listViewAdapter

    addButton.setOnClickListener(object : View.OnClickListener {
        override fun onClick(v: View?) {
            val selectedItem = spinner.selectedItem.toString()
            newKitList.add(selectedItem)
            listViewAdapter.notifyDataSetChanged()
        }
    })

==============

修改

var spinnerArray: Array<Task<QuerySnapshot>> = arrayOf(db.collection("KitList").get()
       .addOnCompleteListener { task ->
           if (task.isSuccessful) {
               spinnerArray = task.result as Array<Task<QuerySnapshot>> //or however you get your document array
               for (document in task.result) {
                   Log.d("weight05", document.id + " => " + document.data)
               }
           } else {
               Log.w("error", "Error getting documents.", task.exception)
           }
       })

Answer 1

嘿Andy我还没有使用过FireStore，但在Firebase数据库和Kotlin方面有经验。根据我的经验，我可以清楚地告诉你，你不会直接收到你的数组，因为主线程上没有提取数据。目前，您的spinnerArray持有对Firebase任务的引用，这就是您的微调器显示此类文本的原因。

要在spinnerArray变量中获取数组，需要在任务成功时获取它，即有点像这样

修改删除你的var spinnerArray初始化，并按照我添加了微调器的适配器。

override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_new_kit_list) var addButton = addKitItemBtn val spinner = newKitItemSpinner val spinnerArrayAdapter = ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item, spinnerArray) //selected item will look like a spinner set from XML spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item) spinner.adapter = spinnerArrayAdapter val kitList = newKistListView val listViewAdapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, newKitList) kitList.adapter = listViewAdapter addButton.setOnClickListener(object : View.OnClickListener { override fun onClick(v: View?) { val selectedItem = spinner.selectedItem.toString() newKitList.add(selectedItem) listViewAdapter.notifyDataSetChanged() } }) db.collection("KitList") .get() .addOnCompleteListener { task -> if (task.isSuccessful) { spinnerArray = task.result //or however you get your document array var spinnerArray = task.result as Array<Task<QuerySnapshot>> val spinnerArrayAdapter = ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item, spinnerArray) //selected item will look like a spinner set from XML spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item) spinner.adapter = spinnerArrayAdapter for (document in task.result) { Log.d("weight05", document.id + " => " + document.data) } } else { Log.w("error", "Error getting documents.", task.exception) } } }

在onCreate中调用这段代码并将spinnerArray初始化为可空属性

Android Firestore微调器未加载我的文档

1 个答案: