我有后端Firebase，用于填充列表视图，突然实现了搜索功能，突然在列表视图中发现了奇怪的行为，它在创建重复的数字，例如30-40及以上。 请帮助我，我从3天开始就开始了。我对开发非常陌生，因此对代码优化的任何建议也将作为帮助！
class Menu : AppCompatActivity(){
private var prevKey : String? = null
var listAdapter : CustomAdapter ? = null
private val listItemArrayList = ArrayList<ListItem>()
var rootRef : FirebaseDatabase? = null
var adminRef : DatabaseReference? = null
var mAuth : FirebaseAuth? = null
var helper : CustomAdapter?=null
private var user : String?=null
var mAuthListener: FirebaseAuth.AuthStateListener? = null
var Items = ArrayList<String>()
var isSectionBoolean = ArrayList<Boolean>()
var ItemCategory= ArrayList<String>()
var ItemCost = ArrayList<Int>()
var listView : ListView? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_menu)
mAuth = FirebaseAuth.getInstance()
mAuthListener = FirebaseAuth.AuthStateListener { }
rootRef = FirebaseDatabase.getInstance()
user =mAuth!!.currentUser!!.phoneNumber as String
adminRef = rootRef!!.getReference("AdminCafe").child(user!!)
listView = findViewById(R.id.admindynamiclist)
listAdapter = CustomAdapter(listItemArrayList,this)
listView!!.adapter = listAdapter
listView!!.isTextFilterEnabled = true
SearchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener{
override fun onQueryTextSubmit(query: String?): Boolean {
return false
}
override fun onQueryTextChange(newText: String?): Boolean {
listAdapter!!.filter(newText.toString())
return false
}
})
getData()
}
fun addAct(v:View)
{
val intent = Intent(applicationContext,AddActivity::class.java)
startActivity(intent)
}
private fun getData() {
println("getData")
var menucatRef = adminRef!!.child("MenuItem")
menucatRef.addValueEventListener(object : ValueEventListener{
override fun onCancelled(p0: DatabaseError) {
}
override fun onDataChange(p0: DataSnapshot) {
for(Snap in p0.children)
{
println("wtfff")
println("Child"+Snap.childrenCount)
getDataFromKey(Snap.key.toString(),Snap.childrenCount.toInt())
}
}
})
}
private fun getDataFromKey(key: String, child :Int) {
listItemArrayList.clear()
println("called")
var count = 0
var counter = 0
var Category = CategoryHeader()
var menuRef = adminRef!!.child("MenuItem").child(key)
menuRef.addListenerForSingleValueEvent(object : ValueEventListener{
override fun onCancelled(p0: DatabaseError) {
}
override fun onDataChange(p0: DataSnapshot) {
var catKey = p0.key.toString()
for(snap in p0!!.children)
{
if(count == 0)
{
Category!!.setheader(catKey)
listItemArrayList!!.add(Category)
println("Seperator will be added")
}
else
{
var hashMap = snap.value as HashMap<String,String>
var itemName = snap.key
var isVeg = hashMap["isVeg"]
var itemCost = hashMap["itemCost"]!!.toInt()
var isSig = hashMap["isSig"]
var ItemHelper = Item()
if(itemName!=null)
{
ItemHelper.setItemName(itemName)
}
if(itemCost!=null)
{
ItemHelper.setItemCost(itemCost)
}
listItemArrayList!!.add(ItemHelper)
}
count++
}
listAdapter!!.notifyDataSetChanged()
}
})
}
interface ListItem {
fun isHeader(): Boolean
fun getName(): String
fun getItemCost() : Int
}
fun editAct(v:View)
{
println("Inside edit")
}
}
And Adapter class
class CustomAdapter(private var listItem : ArrayList<Menu.ListItem>, private val context: Activity) : BaseAdapter() {
var orig = ArrayList<Menu.ListItem> ()
override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
orig.addAll(listItem)
println("List Item is"+listItem)
println("List Item is"+orig)
var holder = ViewHolder()
var customView = convertView
var flag = true
if (convertView == null) {
val layoutInflater = context.layoutInflater
if(listItem.get(position).isHeader()) {
println("position"+position)
customView = layoutInflater.inflate(R.layout.seperator, null)
holder.tvLabel = customView.categoryText
} else {
println("position"+position)
customView = layoutInflater.inflate(R.layout.list_item, null)
holder.tvLabel = customView.itemad
holder.itemCost = customView.cost
flag = false
}
customView.setTag(holder)
}
else
{
customView = convertView
holder = convertView!!.tag as ViewHolder
}
if(flag) {
println("Custoom Flag is"+flag)
holder!!.tvLabel!!.text = listItem.get(position).getName()
}
else {
println("Custoom Flag is"+flag)
holder!!.tvLabel!!.text = listItem.get(position).getName()
holder.itemCost!!.text = listItem.get(position).getItemCost().toString()
}
return customView!!
}
override fun getItem(position: Int): Any {
return listItem.get(position)
}
override fun getItemId(position: Int): Long {
return position.toLong()
}
override fun getCount(): Int {
return listItem.size
}
private inner class ViewHolder {
var tvLabel: TextView? = null
var itemCost: TextView? = null
}
fun filter(query : String)
{
println("called")
listItem.clear()
var search = query
search = search.toLowerCase(Locale.getDefault())
if(search.isEmpty())
{
listItem.addAll(orig!!)
println("Inside size 0")
}
else
{
var counter = 0
for(result in orig!! )
{
if(result.getName().toLowerCase().contains(search))
{
println("Result is "+result.getName())
println("listItem"+listItem)
}
}
}
}
}