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Some XML attributes need to start its value with a question mark (?) and I just wondering how can I know these attributes, particularly these attributes, aren't shown when I press on ( CTRL + Space ) to show suggested attributes examples of these attributes:

  • android:divider="?android:dividerHorizontal"
  • android:textAppearance="?android:textAppearanceLarge"
Martin Zeitler
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Mustafa Essam
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1 Answers1

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the ? is for referencing style attributes; the documentation explains it:

To reference a style attribute, the name syntax is almost identical to the normal resource format, but instead of the at-symbol (@), use a question-mark (?), and the resource type portion is optional.

?[<package_name>:][<resource_type>/]<resource_name>
Martin Zeitler
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