发现名称冲突的吸气剂

Question

I am a beginner in kotlin coding and I am trying to make a search bar with edit text which can find the user account from the fire-base. Here are my codes

    package com.example.videoapp

import android.annotation.SuppressLint
import android.os.Bundle
import android.text.Editable
import android.text.TextWatcher
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.EditText
import androidx.core.widget.addTextChangedListener
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.videoapp.Adapter.UserAdapter
import com.example.videoapp.Model.Users
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.database.*
import kotlinx.android.synthetic.main.fragment_explore.*
import kotlinx.android.synthetic.main.fragment_explore.view.*
import kotlinx.android.synthetic.main.fragment_explore.view.recyclerView
import java.util.*
import kotlin.collections.ArrayList

/**
 * A simple [Fragment] subclass.
 */
class ExploreFragment : Fragment() {
   private var recyclerView: RecyclerView?=null
    private var userAdapter:UserAdapter?=null
    private var mUser: List<Users>?=null
    private var searchEditText: EditText?=null


    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        val view= inflater.inflate(R.layout.fragment_explore, container, false)
        recyclerView = view.findViewById(R.id.recyclerView)
        recyclerView!!.setHasFixedSize(true)
        recyclerView!!.layoutManager = LinearLayoutManager(context)
        searchEditText = view.findViewById(R.id.search_edit_text)

        mUser = ArrayList()
        retrieveAllUserd()
        searchEditText!!.addTextChangedListener(object :TextWatcher{
            override fun afterTextChanged(s: Editable?) {
            }

            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
            }

            override fun onTextChanged(cs: CharSequence?, start: Int, before: Int, count: Int) {
                searchForUser(cs.toString().toLowerCase())
            }
        })

        return view
    }

    private fun retrieveAllUserd() {
        var firebaseUserID = FirebaseAuth.getInstance().currentUser!!.uid
        val refUser =  FirebaseDatabase.getInstance().reference.child("Users").child(firebaseUserID)
        refUser.addValueEventListener(object :ValueEventListener{
            override fun onDataChange(p0: DataSnapshot) {
                (mUser as ArrayList<Users>).clear()
                if (searchEditText!!.text.toString() == ""){
                    for (snapshot in p0.children){
                        val user = snapshot.getValue(Users::class.java)
                        if (!(user!!.getid()).equals(firebaseUserID)){
                            (mUser as ArrayList<Users>).add(user)

                        }
                    }

                }
                userAdapter = UserAdapter(
                    mContext = context!!,
                    mUser = mUser!!,
                    isFragment = false
                )
                recyclerView!!.adapter = userAdapter
            }

            override fun onCancelled(p0: DatabaseError) {
            }

         })

    }
    private fun searchForUser(str: String){
        var firebaseUserID = FirebaseAuth.getInstance().currentUser!!.uid
        val queryUserd = FirebaseDatabase.getInstance().reference.child("Users").orderByChild("name").startAt(str)
            .endAt(str+"\uf8ff")
        queryUserd.addValueEventListener(object : ValueEventListener{
            override fun onCancelled(p0: DatabaseError) {
            }

            override fun onDataChange(p0: DataSnapshot) {
                (mUser as ArrayList<Users>).clear()
                for (snapshot in p0.children){
                    val user = snapshot.getValue(Users::class.java)
                    if (!(user!!.getid()).equals(firebaseUserID)) {
                        (mUser as ArrayList<Users>).add(user)
                    }
                }

                userAdapter = UserAdapter(context!!,mUser!!,false)
                recyclerView!!.adapter = userAdapter


            }
        })
    }


}

package com.example.videoapp.Model

class Users {
    var username:String = " "
    var Fullname:String = " "
    var image:String = " "
    var id:String = " "

    constructor()
    constructor(username: String, fullname: String, image: String, id: String) {
        this.username = username
        this.Fullname = fullname
        this.image = image
        this.id = id
    }
    fun getusername(): String{
        return username
    }
    fun setusername(username: String){
        this.username=username
    }
    fun getfullname(): String{
        return fullname
    }
    fun setfullname(fullname: String){
        this.Fullname=fullname
}

    fun getimage(): String{
        return image
    }
    fun setimage(image: String){
        this.image=image
    }
    fun getid(): String{
        return id
    }
    fun setid(id: String){
        this.id=id
    }


}

But whenever I am typing any word in the search its returning an error

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.videoapp, PID: 4847
com.google.firebase.database.DatabaseException: Found conflicting getters for name: getfullname
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.<init>(com.google.firebase:firebase-database@@19.3.0:477)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.loadOrCreateBeanMapperForClass(com.google.firebase:firebase-database@@19.3.0:329)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertBean(com.google.firebase:firebase-database@@19.3.0:430)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass(com.google.firebase:firebase-database@@19.3.0:231)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertToCustomClass(com.google.firebase:firebase-database@@19.3.0:79)
    at com.google.firebase.database.DataSnapshot.getValue(com.google.firebase:firebase-database@@19.3.0:203)
    at com.example.videoapp.ExploreFragment$searchForUser$1.onDataChange(ExploreFragment.kt:104)
    at com.google.firebase.database.core.ValueEventRegistration.fireEvent(com.google.firebase:firebase-database@@19.3.0:75)
    at com.google.firebase.database.core.view.DataEvent.fire(com.google.firebase:firebase-database@@19.3.0:63)
    at com.google.firebase.database.core.view.EventRaiser$1.run(com.google.firebase:firebase-database@@19.3.0:55)
    at android.os.Handler.handleCallback(Handler.java:790)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:164)

at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

Answer 1

This is all you need to declare your User class:

class Users(
    var username:String = " "
    var Fullname:String = " "
    var image:String = " "
    var id:String = " "
)

Getters and Setters are automatically generated by the Kotlin compiler.

Answer 2

Try to get rid of getters and setters and use data class:

data class User(
        var username: String = " ",
        var fullName: String = " ",
        var image: String = " ",
        var id: String = " "
)

Parameters of primary constructor, eg username, become properties , so you don't need to write additional getter and setter functions for them.

Answer 3

Kotlin compiler generates getters for read-only variables (getters and setters for read-write variables) defined in a class. Because you have a variable named fullname and custom getfullname and setfullname you will have two getters and two setters for fullname variable.

Here are all get methods you will see from Java code:

And looks like snapshot.getValue(Users::class.java) does not know which getters and setters to use.

Simples solution should be removing custom methods:

class Users {
    var username:String = " "
    var Fullname:String = " "
    var image:String = " "
    var id:String = " "

    constructor()
    constructor(username: String, fullname: String, image: String, id: String) {
        this.username = username
        this.Fullname = fullname
        this.image = image
        this.id = id
    }
}

Otherwise, update variables declaration with private access modifier:

class Users {
    private var username:String = " "
    private var Fullname:String = " "
    private var image:String = " "
    private var id:String = " "

    constructor()
    constructor(username: String, fullname: String, image: String, id: String) {
        this.username = username
        this.Fullname = fullname
        this.image = image
        this.id = id
    }

    // Below are your custom getters and setters
}