Bottom Sheet Dialog kotlin

Output:

1/  Modify activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:gravity="center"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btnBottomSheet"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Open Bottom Sheet"
        android:gravity="center"/>
</LinearLayout>

2/  Create and add on bottomsheet_xml.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="16dp"
    android:background="@android:color/white">

    <TextView
        android:layout_gravity="center"
        android:id="@+id/titleTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Bottom Sheet Title"
        android:textSize="18sp"
        android:textStyle="bold"
        android:layout_marginBottom="8dp" />

    <Button
        android:layout_marginTop="24dp"
        android:id="@+id/actionButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Close Bottom Sheet" />
</LinearLayout>

3/  Modify MainActivity.kt

package com.zissofworks.bottomsheetdialog

import android.app.Dialog
import android.graphics.Color
import android.graphics.drawable.ColorDrawable
import android.os.Bundle
import android.view.Gravity
import android.view.ViewGroup
import android.view.Window
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() {

    private lateinit var btnBottomSheet: Button

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContentView(R.layout.activity_main)
        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)
            insets
        }

        btnBottomSheet = findViewById(R.id.btnBottomSheet)

        btnBottomSheet.setOnClickListener { showDialog()}
    }

    private fun showDialog() {
        val dialog = Dialog(this@MainActivity);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.setContentView(R.layout.botttomsheet_xml);

        val actionButton = dialog.findViewById<Button>(R.id.actionButton)

        actionButton.setOnClickListener {dialog.dismiss()}

        dialog.show();
        dialog.window?.setLayout(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
        dialog.window?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT));
        dialog.window?.setGravity(Gravity.BOTTOM);
    }
}