<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    tools:context=".MainActivity">

    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/openPopUp"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="open popUp"/>

</androidx.appcompat.widget.LinearLayoutCompat>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_gravity="center_horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:layout_gravity="center_horizontal"
        android:paddingTop="10dp"
        android:text="@string/app_name"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp"
        android:textColor="@color/black"
        android:textSize="16dp" />

    <TextView
        android:id="@+id/popText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_gravity="center"
        android:paddingTop="10dp"
        android:paddingBottom="10dp"
        android:text="Your text here "
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:textColor="@color/black"
        android:textSize="14dp" />


    <View
        android:layout_marginTop="10dp"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#BEBBBB"/>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btnCancel"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_gravity="right"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:text="OK"
            android:gravity="center"
            android:textAllCaps="false"
            android:textColor="@color/black"
            android:background="@android:color/transparent"
            android:textSize="16dp" />

    </LinearLayout>

</LinearLayout>

import androidx.appcompat.app.AppCompatActivity;

import android.app.Dialog;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = findViewById(R.id.openPopUp);
        button.setOnClickListener(this);


    }

    public void PopUp() {
        Dialog myDialog = new Dialog(this);
        myDialog.setContentView(R.layout.dialog_view);
        myDialog.getWindow().setLayout(WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.WRAP_CONTENT);
        myDialog.setCancelable(false);
        TextView popText = myDialog.findViewById(R.id.popText);
        popText.setText("Your Text Here");
        Button btnCancel = myDialog.findViewById(R.id.btnCancel);
        btnCancel.setOnClickListener(view -> {
            myDialog.dismiss();
        });
        myDialog.show();
    }

    @Override
    public void onClick(View view) {
        if(view.getId() == R.id.openPopUp)
        {
            PopUp();
        }
    }


  
}

   myDialog.getWindow().setLayout(WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.MATCH_PARENT);

myDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));