将自定义CardView样式附加到主题 [英] Attach custom CardView style to theme

问题描述

在我的应用中，我有两个主题(浅色和深色)，我希望所有CardView都可以根据选择的主题来更改其背景颜色.

In my app, I have two themes (light and dark), and I want all of my CardViews to change their background color depending on which theme is selected.

我不想要想要的是:

<android.support.v7.widget.CardView
    style="@style/CardView.MyBlue"
    android:layout_width="200dp"
    android:layout_height="100dp"
    android:layout_gravity="center_horizontal">

上面的代码不是动态的.我需要根据选择的是浅色还是深色主题自动应用两种样式.

The above code is not dynamic. I need my two styles to automatically be applied depending on if a light or a dark theme is selected.

我现在所拥有的不起作用:

What I have right now doesn't work:

<style name="AppTheme.Light" parent="Theme.AppCompat.Light">
   ...
   <item name="cardViewStyle">@style/CardViewStyle.Light</item>
</style>
<style name="AppTheme.Dark" parent="Theme.AppCompat">
   ...
   <item name="cardViewStyle">@style/CardViewStyle.Dark</item>
</style>

<style name="CardViewStyle.Light" parent="CardView">
    <item name="cardBackgroundColor">@color/cardview_dark_background</item>
</style>

<style name="CardViewStyle.Dark" parent="CardView">
        <item name="cardBackgroundColor">@color/cardview_light_background</item>
</style>

我读到某个地方，您可以在/res/values/中定义一个styleable.xml文件以键入单词cardViewStyle，因此我做到了:

I read somewhere that you can define a styleable.xml file in /res/values/ to key the word cardViewStyle, so I did that:

styleable.xml:

<resources>
    <declare-styleable name="AppTheme">
        <attr name="cardViewStyle" format="reference" />
    </declare-styleable>
</resources>

更新

类似的问题此处，也没有答案.

Update

Similar question here with no answer either.

推荐答案

在styles.xml中

In styles.xml

<resources>

    <attr format="reference" name="cardStyle"/>

    <style name="Light" parent="Theme.AppCompat.NoActionBar">
        <item name="cardStyle">@style/CardView.Light</item>
        ...
    </style>

    <style name="Dark" parent="Theme.AppCompat.NoActionBar">
        <item name="cardStyle">@style/CardView.Dark</item>
        ...
    </style>
</resources>

然后在其他xml中使用new属性，您将像这样使用它

Then in your other xml to use the new attribute, you would use it like this

style="?attr/cardStyle"

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