如何添加彩色边框的卡视图？

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最佳答案

try doing:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
card_view:cardElevation="2dp"
card_view:cardCornerRadius="5dp">


<FrameLayout
android:background="#FF0000"
android:layout_width="4dp"
android:layout_height="match_parent"/>


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


<TextView
style="@style/Base.TextAppearance.AppCompat.Headline"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Title" />


<TextView
style="@style/Base.TextAppearance.AppCompat.Body1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Content here" />


</LinearLayout>


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

this removes the padding from the cardview and adds a FrameLayout with a color. You then need to fix the padding in the LinearLayout then for the other fields

Update

If you want to preserve the card corner radius create card_edge.xml in drawable folder:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<solid android:color="#F00" />
<size android:width="10dp"/>
<padding android:bottom="0dp" android:left="0dp" android:right="0dp" android:top="0dp"/>
<corners android:topLeftRadius="5dp" android:bottomLeftRadius="5dp"
android:topRightRadius="0.1dp" android:bottomRightRadius="0.1dp"/>
</shape>

and in the frame layout use android:background="@drawable/card_edge"

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I think this solution may not be efficient but it serves the purpose and adds flexibility with the border width.

 <android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="40dp"
android:layout_gravity="center"
card_view:cardBackgroundColor="@color/some_color"
card_view:cardCornerRadius="20dp"
card_view:contentPadding="5dp"> <!-- Change it to customize the border width -->


<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
card_view:cardCornerRadius="20dp"
card_view:contentPadding="5dp">


<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">


<!-- Add your UI elements -->


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

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I would like to improve the solution proposed by Amit. I'm utilizing the given resources without adding additional shapes or Views. I'm giving CardView a background color and then nested layout, white color to overprint yet with some leftMargin...

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
card_view:cardElevation="2dp"
card_view:cardBackgroundColor="@color/some_color"
card_view:cardCornerRadius="5dp">




<!-- The left margin decides the width of the border -->


<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="16dp"
android:layout_marginLeft="5dp"
android:background="#fff"
android:orientation="vertical">


<TextView
style="@style/Base.TextAppearance.AppCompat.Headline"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Title" />


<TextView
style="@style/Base.TextAppearance.AppCompat.Body1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Content here" />


</LinearLayout>


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

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Start From the material design update, it support app:strokeColor and also app:strokeWidth. see more

to use material design update. add following code to build.gradle(:app)

dependencies {
// ...
implementation 'com.google.android.material:material:1.0.0'
// ...
}

and Change CardView to MaterialCardView

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I solved this by putting two CardViews in a RelativeLayout. One with background of the border color and the other one with the image. (or whatever you wish to use)

Note the margin added to top and start for the second CardView. In my case I decided to use a 2dp thick border.

            <android.support.v7.widget.CardView
android:id="@+id/user_thumb_rounded_background"
android:layout_width="36dp"
android:layout_height="36dp"
app:cardCornerRadius="18dp"
android:layout_marginEnd="6dp">


<ImageView
android:id="@+id/user_thumb_background"
android:background="@color/colorPrimaryDark"
android:layout_width="36dp"
android:layout_height="36dp" />


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


<android.support.v7.widget.CardView
android:id="@+id/user_thumb_rounded"
android:layout_width="32dp"
android:layout_height="32dp"
app:cardCornerRadius="16dp"
android:layout_marginTop="2dp"
android:layout_marginStart="2dp"
android:layout_marginEnd="6dp">


<ImageView
android:id="@+id/user_thumb"
android:src="@drawable/default_profile"
android:layout_width="32dp"
android:layout_height="32dp" />


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

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my solution:

create a file card_view_border.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@color/white_background"/>
<stroke android:width="2dp"
android:color="@color/red" />
<corners android:radius="20dip"/>
</shape>

and set programmatically

cardView.setBackgroundResource(R.drawable.card_view_border);

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CardView extends FrameLayout, so it support foreground attribute. Using foreground attribute can also add border easily.

layout as follows:

<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/link_card"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:foreground="@drawable/bg_roundrect_ripple_light_border"
app:cardCornerRadius="23dp"
app:cardElevation="0dp">
</androidx.cardview.widget.CardView>

bg_roundrect_ripple_light_border.xml

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="@color/ripple_color_light">


<item>
<shape android:shape="rectangle">
<stroke
android:width="0.5dp"
android:color="#DDDDDD" />
<corners android:radius="23dp" />
</shape>
</item>


<item android:id="@android:id/mask">
<shape android:shape="rectangle">
<corners android:radius="23dp" />
<solid android:color="@color/background" />
</shape>
</item>


</ripple>

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As the accepted answer requires you to add a Frame Layout, here how you can do it with material design.

Add this if you haven't already

implementation 'com.google.android.material:material:1.0.0'

Now change to Cardview to MaterialCardView

<com.google.android.material.card.MaterialCardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
app:cardCornerRadius="8dp"
app:cardElevation="2dp"


app:strokeWidth="1dp"
app:strokeColor="@color/black">

Now you need to change the activity theme to Theme.Material. If you are using Theme.Appcompact I will suggest you to move to Theme.Material for future projects for having better material design in you app.

    <style name="AppTheme" parent="Theme.MaterialComponents.DayNight">

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You can keep <androidx.cardview.widget.CardView with android:foreground="@drawable/black_border"

black_border :

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="@color/white" />
<stroke
android:width="1dp"
android:color="@android:color/black" />
</shape>