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What's the difference between ?android:attr/ and ?attr/ in an android layout xml file? Which one should we use in different situations?
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The Attr interface represents an attribute in an Element object. Typically the allowable values for the attribute are defined in a schema associated with the document.
They are using the same name which means they represent the same resource.
You can take a look at it here (attrs. xml). You can define attributes in the top <resources> element or inside of a <declare-styleable> element.
1. ?attr/
Defines and refers to the value of an attribute which you have defined on your own in your application.
2. ?android:attr/
Refers to the values of an attribute which are already available in android built-in. More specifically, the ? implies an extra level of indirection. Think of it as de-referencing an attribute to fetch the resource it points to rather than referring to the attribute itself.
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