How to add colored border on cardview?

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

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"

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>