Xamarin Android支持库自定义样式

Question

I have an Android Application (Xamarin/Visual Studio) with the Minimum Android Version: 2.3 (API Level 10 - Gingerbread) and Compile Android Version: 6.0 (Marshmallow) .

I try to support all these Android Versions while keeping the Material Design Look of my App.

I tried using the Support Libraries (from NuGet: Xamarin.Android.Support.v7.AppCompat version 23 , and Xamarin.Android.Support.v7.CardView version 23 ), and added them to my Project.

Now, I created 3 custom styles for CardViews; in my Resources/values/styles.xml, I have the following Code:

  <?xml version="1.0" encoding="UTF-8"?>

  <resources>
    <!--A single normal lesson for the Timegrid-->
    <style name="Xamarin.Android.Support.v7.CardView.Lesson">
      <item name="cardBackgroundColor">@color/orange_500</item>
      <item name="cardCornerRadius">18dp</item>
    </style>

    <!--A single newly added lesson for the Timegrid-->
    <style name="Xamarin.Android.Support.v7.CardView.LessonNew">
      <item name="cardBackgroundColor">@color/green_500</item>
      <item name="cardCornerRadius">18dp</item>
    </style>

    <!--A single cancelled lesson for the Timegrid-->
    <style name="Xamarin.Android.Support.v7.CardView.LessonCancellation">
      <item name="cardBackgroundColor">@color/grey_500</item>
      <item name="cardCornerRadius">18dp</item>
    </style>

  </resources>

I cannot compile, because of the following Error:

Severity Code Description Project File Line Suppression State Error Error retrieving parent for item: No resource found that matches the given name 'Xamarin.Android.Support.v7.CardView'.

How can I fix this? Thanks in advance

Answer 1

Set the style parent to CardView and change your Name to a non-dot-qualified (local) name.

Style Example:

<style name="LessonNew" parent="CardView">
    <item name="android:layout_margin">10dp</item>
    <item name="cardCornerRadius">18dp</item>
    <item name="cardElevation">10dp</item>
</style>