How to make custom dialog with rounded corners in android

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Create an XML file in drawable, say dialog_bg.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid
        android:color="@color/white"/>
    <corners
        android:radius="30dp" />
    <padding
        android:left="10dp"
        android:top="10dp"
        android:right="10dp"
        android:bottom="10dp" />
</shape>

set it as the background in your layout XML:

android:background="@drawable/dialog_bg"

Set the background of the dialog’s root view to transparent, because Android puts your dialog layout within a root view that hides the corners in your custom layout.

Java:

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

Kotlin:

dialog.window?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))

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