CODEWITHSUNDEEP
androidandroid-resources
a.toraby
a.toraby

Reputation: 3391

?android:attr/colorPrimary vs ?attr/colorPrimary

Could somebody please tell me what the difference is between 

?android:attr/colorPrimary

and

?attr/colorPrimary

Whichever i use, result is the same. Altough first option causes android.view.InflateException on some devices.

Upvotes: 2

Views: 1068

Answers (2)

grebulon
grebulon

Reputation: 7982

The builder knows that the color comes from attr so it's redundant. The documentation states:

... you do not need to explicitly state the type ... you can exclude the attr type.

See: App resources overview: Referencing style attributes

As for android: - the prefix in android:colorPrimary refers to an attribute of the material theme (API 21 and later). Without the prefix, ?colorPrimary will be taken from the support library.

Upvotes: 2

Jitendra Ahuja
Jitendra Ahuja

Reputation: 759

Both almost works the same often. when you use ?attr/colorPrimary, its works totally fine as compiler already knows that 'android' has to be appended.

And regarding you saying that ?android:attr/colorPrimary gives you exception then in that case, try using the second option only ..

For Example in your styles.xml : The following may/may not work everytime 

<resources>
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="android:colorPrimary">@color/primary_material_dark</item>
        <item name="android:colorPrimaryDark">@color/primary_dark_material_dark</item>
    </style>
</resources>

But this majorly works : 

<style name="AppTheme"  parent="Theme.AppCompat.Light.NoActionBar">
    <item name="colorPrimary">@color/primary_material_dark</item>
    <item name="colorPrimaryDark">@color/primary_dark_material_dark</item>
</style>

Upvotes: 2

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