CODEWITHSUNDEEP
android
user1067528
user1067528

Reputation:

What is the difference between ?android:attr/textAppearanceMedium and ?android:textAppearanceMedium?

I find there are two case in some demo codes, What is the difference between ?android:attr/textAppearanceMedium and ?android:textAppearanceMedium ? Thanks!

Case 1

<resources>
    <style name="myTextAppearance">
        <item name="android:textAppearance">?android:attr/textAppearanceMedium</item>
    </style>

Case 2

<resources>
    <style name="myTextAppearance">
        <item name="android:textAppearance">?android:textAppearanceMedium</item>
    </style>  
</resources>

Upvotes: 11

Views: 8808

Answers (3)

V.March
V.March

Reputation: 1840

There are no one difference between ?android:attr/textAppearanceMedium and ?android:textAppearanceMedium.

You can use each of them, as you wish.

Upvotes: 1

neo108
neo108

Reputation: 5246

I think they both do the same, that is refer to a theme attribute.

The DOCS say...

Must be a reference to another resource, in the form "@[+][package:]type:name" or to a theme attribute in the form "?[package:][type:]name".

The [type:] being optional.

More explanation in the following links...

need explanation for android layout syntax

References to Theme Attributes

Upvotes: 5

TactMayers
TactMayers

Reputation: 884

According to Android Developer API Guide - Accessing Resources - Referencing style attributes, the resource type is optional if the system resource tool can figure out the correct resource type. So they are referring to the same value.

Upvotes: 12

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