?android:attr/colorPrimary vs ?attr/colorPrimary

Issue

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.

Solution

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>

Answered By - Jitendra Ahuja