android: user control custom attributes

when I set the attributes values in xml for my custom user control, the changes didn't appear until I run the program and I can see the changes

<myPackage.myUserControl
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    custom:attribute_1="Test" >
</myPackage.myUserControl>

Is there any way to show the changes before run the program?