What is attr in R class in Android? -

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hello i've seen empty class named attr inside autogenerated r.java class; meaning? know styles can defined in style.xml style tag, don't know attr is? in advance c.

r.attr "theme attributes" (not styles).

they're defined in values xml file this:

<attr name="textappearancelarge" format="reference" />

they're used in view contructors defstyle parameter, in:

public textview (context context, attributeset attrs, int defstyle)

i'd imagine it's pretty rare apps add own attr values. ones in android.r.attr used if @ all.


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