How to implement Android Push Notification

 package com.projscope.real_time_communication

 import android.os.Bundle
 import android.widget.Button
 import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat

 class MainActivity : AppCompatActivity() {
     // Initialize the SignalRService to handle connection logic
     private val signalRService = SignalRService()

     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()  // Enables edge-to-edge UI for a full-screen experience
         setContentView(R.layout.activity_main)  // Set the activity layout

         // Find the Start and Stop buttons by their IDs
         val startButton: Button = findViewById(R.id.btn_start)
         val stopButton: Button = findViewById(R.id.btn_stop)

         // When the Start button is clicked, initiate connection
         startButton.setOnClickListener {
             signalRService.startConnection(baseContext) // Initiates connection with SignalR
         }

         // When the Stop button is clicked, stop the connection
         stopButton.setOnClickListener {
             signalRService.stopConnection() // Stops the connection with SignalR
         }

         // Handle system insets for edge-to-edge UI
         ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
             val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars()) 
             v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)  // Adjust padding for system bars
             insets  // Return the insets
         }
     }
 }