Custom Alert Dialog

• Here.. for R.style.CustomAlertDialog, You have to create some xml line in style xml file.. 
• For @drawable/popup_background. You have to create resource file with same name and below code👇 

final AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this,R.style.CustomAlertDialog);

ViewGroup viewGroup = findViewById(android.R.id.content);
View dialogView = LayoutInflater.from(view.getContext()).inflate(R.layout.applyforleave_row, viewGroup, false);
builder.setView(dialogView);
final AlertDialog alertDialog = builder.create();
alertDialog.show();                        
<?xml version="1.0" encoding="utf-8"?>

<resources>
<style name="CustomAlertDialog" parent="Theme.AppCompat.Light.Dialog.Alert">
            <item name="android:windowBackground">@drawable/popup_background</item>
</style>

</resources>       <?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#FFFFFF" />
    <corners android:radius="6dp" />

</shape>