Android Dialog with rounded corners - still showing the background without corners radius

Issue

I want to make rounded corners dialog; but after I was done, it appears like this>>

Java

AlertDialog.Builder dialogBuilder= new AlertDialog.Builder(this);
dialogBuilder.setView(R.layout.complain_dialog);
final AlertDialog alertDialog= dialogBuilder.create();
alertDialog.show();

XML

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="100dp"
app:cardBackgroundColor="#FFF"
app:cardCornerRadius="15dp">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_marginBottom="15dp"
        android:background="@color/black_overlay" />

</android.support.v7.widget.CardView>

The problem is: why the dialog is still shown int the background without corners radius?

After searching for a solution to this problem, I found some of these solutions>>

1- Android Dialog - Rounded Corners and Transparency

2- Android custom alert dialog with rounded corners

3- Android dialog background with corner radius has layered background

Java- After test the above solutions

Dialog dialog= new Dialog(getContext());
dialog.setContentView(R.layout.complain_dialog);
dialog.getWindow().setBackgroundDrawable(new 
ColorDrawable(Color.TRANSPARENT)); 
dialog.show();

Result after test the solutions

Now the dialog is not appear at all! Can any one give me solution for this problem? Thank you in advance.

Solution

Solution with AlertDialog with same layout (tested On Kitkat).

 AlertDialog.Builder dialogBuilder= new AlertDialog.Builder(this);
 dialogBuilder.setView(R.layout.temp);
 final AlertDialog alertDialog= dialogBuilder.create();
 alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
 alertDialog.show();

To appear Dialog as same you need set the width of dialog. Here is a reference. Otherwise it will take the Content width . Do all dialog.getWindow() operation before setting Content view to Dialog.

Answered By - ADM