Android Layout - when to use app: vs android:?

Question

I\'ve been writing some Android apps but I don\'t really understand when to use app: and when to use android:. When styles are not being applied th

Answer 1

moreover you will find two variants

xmlns:app="http://schemas.android.com/apk/res-auto" 

xmlns:app="http://schemas.android.com/apk/[packagename]"

the difference between xmlns lines is res-auto take care of resolving our package as sometime we will add .debug or .test in our package and we already provided the packageid of the app Ex:

xmlns:app="http://schemas.android.com/apk/com.test.io.debug"
xmlns:app="http://schemas.android.com/apk/com.test.io.test"