CardView 背景颜色始终为白色

Question

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

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.

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

Answer 1

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

app:cardBackgroundColor="@somecolor"

like this:

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

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

Edit: As pointed by @imposible, you need to include

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

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

Answer 2

You can do it either in XML or programmatically:

In XML:

card_view:cardBackgroundColor="@android:color/red"

Programmatically:

cardView.setBackgroundColor(ContextCompat.getColor(this, R.color.my_color));

Answer 3

Kotlin for XML

app:cardBackgroundColor="@android:color/red"

code

cardName.setCardBackgroundColor(ContextCompat.getColor(this, R.color.colorGray));

Answer 4

XML code

<android.support.v7.widget.CardView
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view_top"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:cardCornerRadius="5dp"
        app:contentPadding="25dp"
        app:cardBackgroundColor="#e4bfef"
        app:cardElevation="4dp"
        app:cardMaxElevation="6dp" />

From the code

CardView card = findViewById(R.id.card_view_top);
card.setCardBackgroundColor(Color.parseColor("#E6E6E6"));

Answer 5

In XML:

app:cardBackgroundColor="@color/your_color_name"

Both in Java and Kotlin you can do it programmatically:

cardView.setCardBackgroundColor(ContextCompat.getColor(this, R.color.your_color_name));

Answer 6

If still not visible in design view, you can temporarily remove these lines

app:cardUseCompatPadding="true"

or

card_view:cardUseCompatPadding="true"

If you need them, you can then add them back at build time

Answer 7

If someone still gets the white color instead of the color he picked, just change the emulator you working on, that's works for me

Answer 8

app:cardBackgroundColor="#488747"

在您的卡片视图中使用它，您可以更改卡片视图的颜色

Answer 9

You can use

app:cardBackgroundColor="@color/red"

or

android:backgroundTint="@color/red"