Dialog

⇒ we can create custom dialog popups instead of showing default Alert -dialog box :

• we create custom dialog with Dialog class

• setContentView() set layout view of our dialog box

package com.example.demoapi

import android.app.Dialog
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.Toast

class dialogg : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_dialogg)

				// to crate new custom dialog box 
        val dialog = Dialog(this@dialogg)
				
				// set layout to our dialog box 
        dialog.setContentView(R.layout.dialog_box)
				
				// create a button from dialog object (not from current activity) 
        val okBtn : Button = dialog.findViewById(R.id.okbtn)

        okBtn.setOnClickListener{
            Toast.makeText(this@dialogg, "Text Message", Toast.LENGTH_SHORT).show()
            dialog.dismiss()
        }
        
				// to show dialog 
        dialog.show()
    }
}

Set Background Transparent of Dialog

dialog.getWindow()?.setBackgroundDrawableResource(android.R.color.transparent)