material-components_material-components-android/docs/components/Card.md

Cards

Cards contain content and actions about a single subject.

Contents

• Using cards
• Card
• Theming

Using cards

Before you can use a Material card, you need to add a dependency to the Material Components for Android library. For more information, go to the Getting started page.

Cards support checking and dragging, but those behaviors are not implemented by default.

Making cards accessible

The contents within a card should follow their own accessibility guidelines, such as images having content descriptions set on them.

If you have a draggable card, you should set an AccessibilityDelegate on it, so that the behavior can be accessible via screen readers such as TalkBack. See the draggable card section section below for more info.

Making a card checkable

When a card is checked, it will show a checked icon and change its foreground color. There is no default behavior for enabling/disabling the checked state. An example of how to do it in response to a long click is shown below.

In the layout:

<com.google.android.material.card.MaterialCardView
    ...
    android:clickable="true"
    android:focusable="true"
    android:checkable="true">

    ...

</com.google.android.material.card.MaterialCardView>

In code:

card.setOnLongClickListener {
    card.setChecked(!card.isChecked)
    true
}

Making a card draggable

Cards have an app:state_dragged that has foreground and elevation changes to convey motion. We recommend using ViewDragHelper to set the dragged state:

private inner class ViewDragHelperCallback : ViewDragHelper.Callback() {

    override fun onViewCaptured(capturedChild: View, activePointerId: Int) {
        if (capturedChild is MaterialCardView) {
            (view as MaterialCardView).setDragged(true)
        }
    }

    override fun onViewReleased(releaseChild: View, xVel: Float, yVel: Float) {
        if (releaseChild is MaterialCardView) {
            (view as MaterialCardView).setDragged(false)
        }
    }
}

Alternatively, the Material Catalog has an implementation example that uses a custom class called DraggableCoordinatorLayout that you can copy, which is used as the parent container in the layout:

In the layout:

<io.material.catalog.draggable.DraggableCoordinatorLayout
    android:id="@+id/parentContainer"
    ...>

    <com.google.android.material.card.MaterialCardView
        ...>

        ...

    </com.google.android.material.card.MaterialCardView>

</io.material.catalog.draggable.DraggableCoordinatorLayout>

In code:

parentContainer.addDraggableChild(card)

parentContainer.setViewDragListener(object : DraggableCoordinatorLayout.ViewDragListener {

    override fun onViewCaptured(view: View, pointerId: Int) {
        card.isDragged = true
    }

    override fun onViewReleased(view: View, vX: Float, vY: Float) {
        card.isDragged = false
    }
})

Finally, make sure to make the behavior is accessible by setting an AccessibilityDelegate on the card. The following shows an example of allowing the user to move the card to two different positions on the screen.

private val cardDelegate = object : AccessibilityDelegate() {
    override fun onInitializeAccessibilityNodeInfo(host: View, info: AccessibilityNodeInfo) {
        super.onInitializeAccessibilityNodeInfo(host, info)

        val layoutParams = card!!.layoutParams as CoordinatorLayout.LayoutParams
        val gravity = layoutParams.gravity
        val isOnTop = gravity and Gravity.TOP == Gravity.TOP
        val isOnBottom = gravity and Gravity.BOTTOM == Gravity.BOTTOM

        if (!isOnTop) {
            info.addAction(AccessibilityAction(R.id.move_card_top_action, getString(R.string.card_action_move_top)))
        }
        if (!isOnBottom) {
            info.addAction(AccessibilityAction(R.id.move_card_bottom_action, getString(R.string.card_action_move_bottom)))
        }
    }

    override fun performAccessibilityAction(host: View, action: Int, arguments: Bundle): Boolean {
        val gravity: Int
        if (action == R.id.move_card_top_action) {
            gravity = Gravity.TOP
        } else if (action == R.id.move_card_bottom_action) {
            gravity = Gravity.BOTTOM
        } else {
            return super.performAccessibilityAction(host, action, arguments)
        }

        val layoutParams = card!!.layoutParams as CoordinatorLayout.LayoutParams
        if (layoutParams.gravity != gravity) {
            layoutParams.gravity = gravity
            card!!.requestLayout()
        }

        return true
    }
}

Note: Cards also support a swipe-to-dismiss behavior through the use of 'SwipeDismissBehavior'. You can see an example here.

Card

On mobile, a card’s default elevation is 1dp, with a raised dragged elevation of 8dp.

Card examples

API and source code:

• MaterialCardView
  • Class definition
  • Class source

Note: You don't need to specify a style tag as long as you are using a Material Components Theme. If not, set the style to Widget.MaterialComponents.CardView.

Elevated card

The following example shows an elevated card.

<com.google.android.material.card.MaterialCardView
    android:id="@+id/card"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <!-- Media -->
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="194dp"
            app:srcCompat="@drawable/media"
            android:scaleType="centerCrop"
            android:contentDescription="@string/content_description_media"
            />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:padding="16dp">

            <!-- Title, secondary and supporting text -->
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title"
                android:textAppearance="?attr/textAppearanceHeadline6"
                />
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:text="@string/secondary_text"
                android:textAppearance="?attr/textAppearanceBody2"
                android:textColor="?android:attr/textColorSecondary"
                />
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:text="@string/supporting_text"
                android:textAppearance="?attr/textAppearanceBody2"
                android:textColor="?android:attr/textColorSecondary"
                />

        </LinearLayout>

        <!-- Buttons -->
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="8dp"
            android:orientation="horizontal">
            <com.google.android.material.button.MaterialButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginEnd="8dp"
                android:text="@string/action_1"
                style="?attr/borderlessButtonStyle"
                />
            <com.google.android.material.button.MaterialButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/action_2"
                style="?attr/borderlessButtonStyle"
                />
        </LinearLayout>

    </LinearLayout>

</com.google.android.material.card.MaterialCardView>

Outlined card

The following example shows an outlined card.

In the layout:

<com.google.android.material.card.MaterialCardView
    ...
    app:strokeWidth="1dp"
    app:strokeColor="@color/stroke_color"
    app:cardElevation="0dp">

    ...

</com.google.android.material.card.MaterialCardView>

In the stroke color (stroke_color.xml):

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="?attr/colorPrimary" android:state_checked="true"/>
    <item android:alpha="0.12" android:color="?attr/colorOnSurface" android:state_checked="false"/>
</selector>

Anatomy and key properties

A card has a container and an optional thumbnail, header text, secondary text, media, supporting text, buttons and icons.

1. Container
2. Thumbnail
3. Header text
4. Secondary text
5. Media
6. Supporting text
7. Buttons
8. Icons
9. Checked icon (not shown)

Note: All the optional elements of a card's content (with the exception of the checked icon) are implemented through the use of other views/components, as shown in the card examples section.

Container attributes

	Attribute	Related method(s)	Default value
Color	app:cardBackgroundColor	setCardBackgroundColor getCardBackgroundColor	?attr/colorSurface
Foreground color	app:cardForegroundColor	setCardForegroundColor getCardForegroundColor	@android:color/transparent (see all states)
Stroke color	app:strokeColor	setStrokeColor getStrokeColor getStrokeColorStateList	null
Stroke width	app:strokeWidth	setStrokeWidth getStrokeWidth	0dp
Shape	app:shapeAppearance	setShapeAppearanceModel getShapeAppearanceModel	?attr/shapeAppearanceMediumComponent
Elevation	app:cardElevation	setCardElevation setCardMaxElevation	1dp
Ripple color	app:rippleColor	setRippleColor setRippleColorResource getRippleColor	?attr/colorOnSurface at 20% opacity (see all states)

Note: We recommend that cards on mobile have 8dp margins. android:layout_margin will NOT work in default styles (eg. materialCardViewStyle) so either set this attr directly on a MaterialCardView in the layout or add it to a style that is applied in the layout with style="@style/....

Note: Without an app:strokeColor, the card will not render a stroked border, regardless of the app:strokeWidth value.

Checked icon attributes

	Attribute	Related method(s)	Default value
Icon	checkedIcon	setCheckedIcon setCheckedIconResource getCheckedIcon	@drawable/ic_mtrl_checked_circle.xml
Color	checkedIconTint	setCheckedIconTint getCheckedIconTint	?attr/colorPrimary
Checkable	android:checkable	setCheckable isCheckable	false
Size	checkedIconSize	setCheckedIconSize setCheckedIconSizeResource getCheckedIconSize	24dp
Margin	checkedIconMargin	setCheckedIconMargin setCheckedIconMarginResource getCheckedIconMargin	8dp

States

Cards can have the following states:

State	Description	Related method(s)
Default	Card is not checked and not dragged	N/A
Checked (android:state_checked)	true if a card is checked	setChecked setOnCheckedChangeListener isChecked
Dragged (app:state_dragged)	true when a card is being dragged	setDragged isDragged

Styles

	Style
Default style	Widget.MaterialComponents.CardView

Default style theme attribute: ?attr/materialCardViewStyle

See the full list of styles and attributes.

Theming cards

A card supports Material Theming and can be customized in terms of color, typography and shape.

Card theming example

API and source code

• MaterialCardView
  • Class definition
  • Class source

The following example shows a card with Material Theming.

Implementing card theming

Using theme attributes and a style in res/values/styles.xml (themes all cards and affects other components):

<style name="Theme.App" parent="Theme.MaterialComponents.*">
    ...
    <item name="colorPrimary">@color/shrine_pink_100</item>
    <item name="colorSurface">@color/shrine_pink_light</item>
    <item name="colorOnSurface">@color/shrine_pink_900</item>
    <item name="shapeAppearanceMediumComponent">@style/ShapeAppearance.App.MediumComponent</item>
</style>

<style name="ShapeAppearance.App.MediumComponent" parent="ShapeAppearance.MaterialComponents.MediumComponent">
    <item name="cornerFamily">cut</item>
    <item name="cornerSize">8dp</item>
</style>

or using a default style theme attribute, styles and a theme overlay (themes all cards but does not affect other components):

<style name="Theme.App" parent="Theme.MaterialComponents.*">
    ...
    <item name="materialCardViewStyle">@style/Widget.App.CardView</item>
</style>

<style name="Widget.App.CardView" parent="Widget.MaterialComponents.CardView">
    <item name="materialThemeOverlay">@style/ThemeOverlay.App.Card</item>
    <item name="shapeAppearance">@style/ShapeAppearance.App.MediumComponent</item>
</style>

<style name="ThemeOverlay.App.Card" parent="">
    <item name="colorPrimary">@color/shrine_pink_100</item>
    <item name="colorSurface">@color/shrine_pink_light</item>
    <item name="colorOnSurface">@color/shrine_pink_900</item>
</style>

or using the style in the layout (affects only this specific card):

<com.google.android.material.card.MaterialCardView
    ...
    style="@style/Widget.App.CardView"
/>

In order to optimize shape theming, some (optional) adjustments need to be made to the card layout to incorporate ShapeableImageView.

In the layout:

<com.google.android.material.card.MaterialCardView
    ...
    app:cardPreventCornerOverlap="false">

    ...

        <!-- Media -->
        <com.google.android.material.imageview.ShapeableImageView
            ...
            app:shapeAppearance="?attr/shapeAppearanceMediumComponent"
            app:shapeAppearanceOverlay="@style/ShapeAppearanceOverlay.App.Card.Media"
            />

</com.google.android.material.card.MaterialCardView>

In res/values/styles.xml:

<style name="ShapeAppearanceOverlay.App.Card.Media" parent="">
    <item name="cornerSizeBottomLeft">0dp</item>
    <item name="cornerSizeBottomRight">0dp</item>
</style>

Note: In order to theme card contents (text, buttons, etc.), the relevant styles/attributes for these components will need to be included. For more information, see the article on buttons.