startAfter()方法使应用程序Firestore数据库崩溃 [英] startAfter() method crashed app Firestore database
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问题描述
第一次数据正确，但是下次应用崩溃并出现以下错误
First time data come properly, but next time onwards app crash with below error
依赖性
Dependency
implementation 'com.google.firebase:firebase-firestore-ktx:20.1.0'
崩溃详细信息:
--------- beginning of crash
2019-07-10 11:38:39.184 14145-14145/com.ycrathi.surajgold E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.ycrathi.surajgold, PID: 14145
java.lang.RuntimeException: No properties to serialize found on class com.google.firebase.firestore.A
at com.google.firebase.firestore.g.k$a.<init>(:677)
at com.google.firebase.firestore.g.k.a(:365)
at com.google.firebase.firestore.g.k.m(:177)
at com.google.firebase.firestore.g.k.b(:104)
at com.google.firebase.firestore.g.k.a(:77)
at com.google.firebase.firestore.H.b(:210)
at com.google.firebase.firestore.H.a(:200)
at com.google.firebase.firestore.z.a(:687)
at com.google.firebase.firestore.z.a(:524)
at d.f.a.d.b.q.a(:134)
at androidx.recyclerview.widget.RecyclerView.d(:4961)
at androidx.recyclerview.widget.RecyclerView$w.run(:5117)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:949)
at android.view.Choreographer.doCallbacks(Choreographer.java:761)
at android.view.Choreographer.doFrame(Choreographer.java:693)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:935)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7045)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:965)
我阅读了这个问题:如何使用Android对Firestore进行分页? 应用了此链接中可用的相同逻辑 https://stackoverflow.com/a/50742175/5096868
I read this question : How to paginate Firestore with Android? Applied same logic which is available in this link https://stackoverflow.com/a/50742175/5096868
代码:
class CreditListFragment : BaseFragment() {
private lateinit var db: FirebaseFirestore
private lateinit var collectionReference: CollectionReference
private lateinit var binding: CreditListFragmentBinding
//private lateinit var adapterTxnEntry: CreditEntryRVAdapter
private var isScrolling = false
private var isLastItemReached = false
private val pageLimit: Long = 10
private var lastVisible: DocumentSnapshot? = null
companion object {
fun newInstance() = CreditListFragment()
}
private lateinit var viewModel: CreditEntryViewModel
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
binding = DataBindingUtil.inflate(
inflater, R.layout.credit_list_fragment, container, false
)
viewModel = ViewModelProviders.of(this).get(CreditEntryViewModel::class.java)
binding.creditEntryVM = viewModel
return binding.root
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
//setUpList()
db = FirebaseFirestore.getInstance()
collectionReference = db.collection(BuildConfig.CREDIT_ENTRY_COLLECTION)
val baseQuery = collectionReference.orderBy("lastUpdated", Query.Direction.DESCENDING).limit(pageLimit)
//setUpAdapter()
val arrayList = ArrayList<AddEntry>()
binding.transactionRecyclerView.layoutManager = LinearLayoutManager(activity)
val adapter = CreditListRVAdapter(activity, arrayList)
binding.transactionRecyclerView.adapter = adapter
binding.swipeRefreshLayout.isRefreshing = true
baseQuery.get().addOnCompleteListener {
if (it.isSuccessful) {
it.result?.documents?.forEach {
val addEntry = it.toObject(AddEntry::class.java)
if (addEntry != null) {
addEntry.id = it.id
arrayList.add(addEntry)
lastVisible = it
LogUtils.d("Yogesh","Added entry " + lastVisible)
}
}
binding.swipeRefreshLayout.isRefreshing = false
adapter.notifyDataSetChanged()
if (it.result?.size()!! < pageLimit) {
isLastItemReached = true
}
if (arrayList.size == 0) {
showNoDataAvailableDialog(
"Great..!!",
"There is no any credit in our database!!"
)
}
}else {
showNoDataAvailableDialog(
"Error..!!",
"Please check your internet connection!!"
)
}
}
val onScrollListener = object : RecyclerView.OnScrollListener() {
override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
super.onScrollStateChanged(recyclerView, newState)
if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
isScrolling = true
}
}
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
val linearLayoutManager = recyclerView.layoutManager as LinearLayoutManager?
var firstVisibleItemPosition = linearLayoutManager?.findFirstVisibleItemPosition()
var visibleItemCount = linearLayoutManager?.childCount
val totalItemCount = linearLayoutManager?.itemCount
if (visibleItemCount == null)
visibleItemCount = 0
if (firstVisibleItemPosition == null)
firstVisibleItemPosition = 0
if (isScrolling && firstVisibleItemPosition + visibleItemCount == totalItemCount && !isLastItemReached) {
isScrolling = false
LogUtils.d("Yogesh", "OnScrolling $isScrolling")
/*val nextQuery = collectionReference.orderBy("lastUpdated", Query.Direction.DESCENDING)
.startAfter(lastVisible)
.limit(pageLimit)*/
LogUtils.d("Yogesh", "Set query $isScrolling")
baseQuery.startAfter(lastVisible)
baseQuery.get().addOnCompleteListener {
try {
LogUtils.d("Yogesh","Inside complete "+it.isSuccessful )
if (it.isSuccessful) {
it.result?.documents?.forEach { it1 ->
val addEntry = it1.toObject(AddEntry::class.java)
if (addEntry != null) {
addEntry.id = it1.id
arrayList.add(addEntry)
lastVisible = it1
LogUtils.d("Yogesh", "Second Added entry $lastVisible")
}
}
adapter.notifyDataSetChanged()
}
if (it.result?.size()!! < pageLimit) {
isLastItemReached = true
}
}catch (e : Exception){
e.printStackTrace()
LogUtils.d("Yogesh", "Error ${e.message}")
}
}.addOnFailureListener{
LogUtils.d("Yogesh", "Error ${it.message}")
}
}
}
}
binding.transactionRecyclerView.addOnScrollListener(onScrollListener)
binding.swipeRefreshLayout.setOnRefreshListener {
binding.swipeRefreshLayout.isRefreshing = false
}
}
}
AddEntry类
@Keep
class AddEntry : Serializable {
@Exclude
var id = ""
/*
* total amount
* */
@SerializedName("t_amt")
var t_amt: Float = 0.0f
/*
* Credit Amount
* */
@SerializedName("c_amt")
var c_amt: Float = 0.0f
/*
* Customer mobile
* */
@SerializedName("cMob")
var cMob: String = ""
/*
* Customer Name
* */
@SerializedName("cName")
var cName: String = ""
/*
* moderator name
* */
@SerializedName("mName")
var mName: String = ""
/*
* moderator mobile
* */
@SerializedName("mMob")
var mMob: String = ""
/*
* Entry time
* */
@SerializedName("createdAt")
var createdAt: Long = 0
/*
* Updated time
* */
@SerializedName("lastUpdated")
var lastUpdated: Long = 0
/*
* reminder date
* */
@SerializedName("reminderDate")
var reminderDate: Long = 0
override fun toString(): String {
return "\n[" +
"t_amt : $t_amt,\n" +
"c_amt : $c_amt,\n" +
"cMob : $cMob,\n" +
"cName : $cName,\n" +
"mName : $mName,\n" +
"mMob : $mMob,\n" +
"reminderDate : $reminderDate,\n" +
"createdAt : $createdAt\n" +
"lastUpdated : $lastUpdated\n" +
"]"
}
}
实际上，我使用了 FirestorePagingAdapter ，但是如果使用此功能，则无法更新适配器，而我想更新项目.
如果有问题，请协助我.
Actually i used FirestorePagingAdapter but if we use this then we cant update adapter, and i want update items.
Please assist me, if something is wrong.
设备:三星s8，三星s9
数据库结构:
--credit_entry_collection (collection)
-- unique_document_id (document)
--AddEntry model class
重要提示:如果我删除startAfter()方法，则可以正常工作. 但是分页不起作用
Important : If i remove startAfter() method then working properly. But paginate not work
推荐答案
在firebase实时数据库(在浏览器中)将规则更改为public
In the firebase realtime database(In the browser) changes rules to public
这篇关于startAfter()方法使应用程序Firestore数据库崩溃的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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