CardView背景颜色始终为白色 [英] CardView background color always white

问题描述

我正在将RecyclerView与GridLayoutManager一起使用，并且每个项目都作为CardView.

I am using RecyclerView with GridLayoutManager and I have each item as CardView.

不幸的是，这里的CardView似乎没有改变其背景颜色.我尝试了布局和程序设计，但是似乎没有任何尝试.

Unfortunately, the CardView here does not seem to change its background color. I tried in layout and programmatically as well but I have tried nothing seems to work.

我已经挣扎了很长一段时间.如果有人可以帮助我解决此问题，我将不胜感激.

I Have been struggling for quite a while. I appreciate if someone could help me out with this issue.

推荐答案

如果要更改卡片背景色，请使用:

If you want to change the card background color, use:

app:cardBackgroundColor="@somecolor"

像这样:

<android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:cardBackgroundColor="@color/white">

</android.support.v7.widget.CardView>

修改: 正如@imposible指出的那样，您需要添加

As pointed by @imposible, you need to include

xmlns:app="http://schemas.android.com/apk/res-auto"

在您的根XML标记中，以使此代码段起作用

in your root XML tag in order to make this snippet function

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