how to set colored border on cardview

问题

I am implementing card view but I can't find any border option to set a border on it.

here is my card.xml:

<android.support.v7.widget.CardView android:layout_marginTop="10dp"
  android:id="@+id/cardView"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  xmlns:android="http://schemas.android.com/apk/res/android"
  card_view:cardPreventCornerOverlap="false"
  app:cardPreventCornerOverlap="false"
  xmlns:card_view="http://schemas.android.com/tools"
  xmlns:app="http://schemas.android.com/apk/res-auto">

  <RelativeLayout
     android:background="@drawable/tab_bg"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:padding="16dp">

     <TextView
         android:id="@+id/title"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Title"
         android:textSize="20sp" />

  </RelativeLayout>

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

here is my image that I want to implement that green border on card view?

Help me. How can I implement this thing? I have no clue.

Thank you.

回答1:

Create drawable selector.xml

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#808080"/>
    <stroke android:width="3dp" android:color="#B1BCBE" />
    <corners android:radius="20dp"/>
    <padding android:left="0dp" android:top="0dp"
             android:right="0dp" android:bottom="0dp" />
</shape>

then give set this as a background, change color according your choice

回答2:

Started from v28 design support library we can use Material Card View, which provides us with a material styled cardview implementation out of the box.

<android.support.design.card.MaterialCardView
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_margin="10dp">
    ... child views ...
</android.support.design.card.MaterialCardView>

You can further style the cardview by using two of the attributes that come with it:

app:strokeColor - The colour to be used for the given stroke, this must be set in order to display a stroke
app:strokeWidth - The width to be applied to the stroke of the view

回答3:

here is the solution for your problem:

<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
   <solid android:color="#ffffff" />
   <stroke android:width="1dip" android:color="#00ff00"/>
   <corners android:radius="20dip"/>
</shape>

use it as background drawable of your layout

回答4:

I did this a little simpler by making the cardBackgroundColor green and contentPadding 1dp and inside the card having a ConstraintLayout (or other layout) with a white background, like this:

<android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        app:cardBackgroundColor="@color/colorAccent"
        app:contentPadding="1dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@android:color/white"
            android:padding="8dp">

    ...

This way no extra xml or other superfluous code is needed.

Result:

来源：https://stackoverflow.com/questions/36575069/how-to-set-colored-border-on-cardview

标签

android

material-design

android-appcompat