How to set CardView attributes in style.xml file in android

问题

I have set a style for my CardView in style.xml file but its giving me error on compile time for app:cardCornerRadius, app:cardElevation, app:cardPreventCornerOverlap and app:contentPadding attributes. What is the correct way to set style for a CardView in Android?

Below is some of my code:

<style name="CardViewStyle" parent="CardView">
    <item name="android:layout_marginBottom">@dimen/cardMarginVertical</item>
    <item name="android:layout_marginTop">@dimen/cardMarginVertical</item>
    <item name="android:layout_marginLeft">@dimen/cardMarginHorizontal</item>
    <item name="android:layout_marginRight">@dimen/cardMarginHorizontal</item>
    <item name="app:cardCornerRadius">2dp</item>
    <item name="app:cardElevation">2dp</item>
    <item name="app:cardPreventCornerOverlap">false</item>
    <item name="app:contentPadding">0dp</item>
    <item name="android:layout_width">match_parent</item>
</style>

回答1:

Set parent attribute to CardView. You don't even have to add

• app: qualifier
• xmlns:card_view="http://schemas.android.com/apk/res-auto". is not required

Working snippet of code:

<style name="CardViewStyle" parent="CardView">
 <item name="cardCornerRadius">4dp</item>
 <item name="cardElevation">4dp</item>
</style>

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来源：https://stackoverflow.com/questions/31221911/how-to-set-cardview-attributes-in-style-xml-file-in-android