Add button in recyclerview to edit or delete data from realtime database - kotlin

Question

i'm a beginner in programming so forgive me if my code is messy. I need some help to complete my program.
I'm using recyclerview to retrieve some data from realtime database and i want to add edit and delete button in the recyclerview to edit and delete some data.
I already create the button in the xml file, i just don't know how to code the button. I already tried some tutorial from youtube and refer to some code in some others post on stack overflow but most of the time the code will either give me an error or the button will not do anything. I've included my code and database structure below:
DoctorViewAdapter.kt
package com.example.patientmonitor
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.webkit.WebView
import android.webkit.WebViewClient
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.android.volley.Request
import com.android.volley.Response
import com.android.volley.toolbox.StringRequest
import com.android.volley.toolbox.Volley
import java.util.ArrayList
import kotlin.concurrent.fixedRateTimer
class DoctorViewAdapter(private val patientList : ArrayList<doctorViewPatient>) : RecyclerView.Adapter<DoctorViewAdapter.DoctorViewHolder>() {
//WebView
private lateinit var pulseGraph: WebView
private lateinit var temperatureGraph: WebView
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DoctorViewHolder {
val itemView = LayoutInflater.from(parent.context).inflate(R.layout.patient_item,parent,false)
return DoctorViewHolder(itemView)
pulseGraph.webViewClient = WebViewClient()
temperatureGraph.webViewClient = WebViewClient()
pulseGraph.settings.javaScriptEnabled = true
temperatureGraph.settings.javaScriptEnabled = true
pulseGraph.settings.builtInZoomControls = true
temperatureGraph.settings.builtInZoomControls = true
}
override fun onBindViewHolder(holder: DoctorViewHolder, position: Int) {
val currentitem = patientList[position]
holder.userID.text = currentitem.userID
holder.fullName.text = currentitem.fullName
holder.userEmail.text = currentitem.email
holder.phoneNumber.text = currentitem.phoneNumber
var pulseValue = "null"
var temperatureValue = "null"
//get pulse value from thingspeak and set to text view
val pulsequeue = Volley.newRequestQueue(holder.pulseValue.context)
val temperaturequeue = Volley.newRequestQueue(holder.temperatureValue.context)
val pulseRequest = StringRequest(Request.Method.GET, currentitem.pulseValue as String?,
Response.Listener<String> { response ->
pulseValue = response
holder.pulseValue.text = pulseValue
}, Response.ErrorListener {
// didn't work
})
//get temperature value from thingspeak and set to text view
val tempRequest = StringRequest(Request.Method.GET, currentitem.temperatureValue as String?,
Response.Listener<String> { response ->
temperatureValue = response
holder.temperatureValue.text = temperatureValue
}, Response.ErrorListener {
// didn't work
})
//get thingspeak data every 1 second
fixedRateTimer("timer", false, 0L, 1000) {
pulsequeue.add(pulseRequest)
temperaturequeue.add(tempRequest)
}
}
override fun getItemCount(): Int {
return patientList.size
}
class DoctorViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView){
val userID : TextView = itemView.findViewById(R.id.tvUserID)
val fullName : TextView = itemView.findViewById(R.id.tvFullName)
val userEmail : TextView = itemView.findViewById(R.id.tvEmail)
val phoneNumber : TextView = itemView.findViewById(R.id.tvPhoneNumber)
val pulseValue : TextView = itemView.findViewById(R.id.tvPulseValue)
val temperatureValue : TextView = itemView.findViewById(R.id.tvTemperatureValue)
}
}
PatientlistActivity.kt
package com.example.patientmonitor
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.webkit.WebView
import androidx.appcompat.app.ActionBar
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.google.android.material.floatingactionbutton.FloatingActionButton
import com.google.firebase.database.*
class PatientListActivity : AppCompatActivity() {
private lateinit var dbref : DatabaseReference
private lateinit var userRecyclerview : RecyclerView
private lateinit var userArrayList : ArrayList<doctorViewPatient>
private lateinit var viewPatientBtn : FloatingActionButton
private lateinit var doctorViewAdapter : DoctorViewAdapter
//ActionBar
private lateinit var actionBar: ActionBar
//WebView
private lateinit var pulseView: WebView
private lateinit var tempView: WebView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_patient_list)
//configure Actionbar //enable back button
actionBar = supportActionBar!!
actionBar.title = "View Patients"
actionBar.setDisplayHomeAsUpEnabled(true)
actionBar.setDisplayShowHomeEnabled(true)
userRecyclerview = findViewById(R.id.patientList)
userRecyclerview.layoutManager = LinearLayoutManager(this)
userRecyclerview.setHasFixedSize(true)
userArrayList = arrayListOf<doctorViewPatient>()
getUserData()
}
private fun getUserData() {
//get intent
val assignedDoctor = intent.getStringExtra("doctorID")
val currentUserAccess = intent.getStringExtra("currentUserAccess")
dbref = FirebaseDatabase.getInstance().getReference("Users")
dbref.orderByChild("assignedDoctor").equalTo(assignedDoctor).addListenerForSingleValueEvent(object : ValueEventListener{
override fun onDataChange(snapshot: DataSnapshot) {
if (snapshot.exists()){
for (userSnapshot in snapshot.children){
val user = userSnapshot.getValue(doctorViewPatient::class.java)
userArrayList.add(user!!)
}
userRecyclerview.adapter = DoctorViewAdapter(userArrayList)
}
}
override fun onCancelled(error: DatabaseError) {
TODO("Not yet implemented")
}
})
}
}
This is my data class
doctorViewPatient.kt
data class doctorViewPatient(val userID : String? =null,
val fullName : String? =null,
val email : String? =null,
val phoneNumber : String? =null,
val pulseValue : String? = null,
val temperatureValue : String? = null)
This is my Realtime Database Structure