Working with Custom View. Once you define the custom attributes, you can use them in layout XML files just like built-in attributes. The only difference is that your custom attributes belong to a different namespace. Instead of belonging to the http://schemas.android.com/apk/res/android namespace, they belong to:
A) http://schemas.android.com/apk/res/[your package name]
B) http://schemas.android.com/apk/[your package name]
C) http://schemas.android.com/[your package name]

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Quizplus · Accepted Answer

Custom attributes in Android are defined in a namespace specific to the application, which follows the format http://schemas.android.com/apk/res/[your package name].