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CardView not showing Shadow in Android L

Posted by: admin November 30, 2017 Leave a comment

Questions:

My Cardview inside Listview is not showing shadow in Android L(Nexus 5). Also the round edges are not properly shown. Here is the code for Listview’s Adapter View :

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:app="http://schemas.android.com/apk/res/com.example.myapp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >

<android.support.v7.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:id="@+id/card_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardBackgroundColor="@android:color/white"
    android:foreground="?android:attr/selectableItemBackground"
    app:cardCornerRadius="4dp"
    app:cardElevation="4dp" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingTop="@dimen/activity_vertical_margin" >

        <TextView
            android:id="@+id/tvName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_marginTop="@dimen/padding_small"
            android:paddingLeft="@dimen/activity_horizontal_margin"
            android:paddingRight="@dimen/activity_horizontal_margin"
            android:textAppearance="?android:attr/textAppearanceLarge" />

        <ImageView
            android:id="@+id/ivPicture"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/tvName"
            android:layout_centerHorizontal="true"
            android:scaleType="fitCenter" />

        <TextView
            android:id="@+id/tvDetail"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/ivPicture"
            android:layout_centerHorizontal="true"
            android:paddingLeft="@dimen/activity_horizontal_margin"
            android:paddingRight="@dimen/activity_horizontal_margin" />
    </RelativeLayout>
</android.support.v7.widget.CardView>

And the ListView xml :

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res/com.example.myapp"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/app_bg" >

<ListView
    android:id="@android:id/list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentTop="true"
    android:cacheColorHint="#00000000"
    android:divider="@android:color/transparent"
    android:drawSelectorOnTop="true"
    android:smoothScrollbar="true" />

<ProgressBar
    android:id="@+id/progressBarMain"
    style="?android:attr/progressBarStyleLarge"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:visibility="gone" /></RelativeLayout>

It works fine on pre-L devices with proper shadow and rounded corners. But not working aon Android L device. Can you tell what i am missing here?

Answers:

After going through the docs again, I finally found the solution.

Just add card_view:cardUseCompatPadding="true" to your CardView and shadows will appear on Lollipop devices.

What happens is, the content area in a CardView take different sizes on pre-lollipop and lollipop devices. So in lollipop devices the shadow is actually covered by the card so its not visible. By adding this attribute the content area remains the same across all devices and the shadow becomes visible.

My xml code is like :

<android.support.v7.widget.CardView
    android:id="@+id/media_card_view"
    android:layout_width="match_parent"
    android:layout_height="130dp"
    card_view:cardBackgroundColor="@android:color/white"
    card_view:cardElevation="2dp"
    card_view:cardUseCompatPadding="true"
    >
...
</android.support.v7.widget.CardView>

Questions:
Answers:

use app:cardUseCompatPadding="true" inside your cardview.
For Example

<android.support.v7.widget.CardView
        android:id="@+id/card_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginRight="@dimen/cardviewMarginRight"
        app:cardBackgroundColor="@color/menudetailsbgcolor"
        app:cardCornerRadius="@dimen/cardCornerRadius"
        app:cardUseCompatPadding="true"
        app:elevation="0dp">
    </android.support.v7.widget.CardView>

Questions:
Answers:

Do not forget that to draw shadow you must use hardwareAccelerated drawing

hardwareAccelerated = true
enter image description here

hardwareAccelerated = false
hardwareAccelerated CardView

See Android Hardware Acceleration for details

Questions:
Answers:

Finally i was able to get shadows on Lollipop device by adding margin to the cardview. Here is the final cardview layout :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:app="http://schemas.android.com/apk/res/com.example.myapp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

<android.support.v7.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:id="@+id/card_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardBackgroundColor="@android:color/white"
    android:foreground="?android:attr/selectableItemBackground"
    android:layout_marginLeft="@dimen/activity_horizontal_margin"
    android:layout_marginRight="@dimen/activity_horizontal_margin"
    android:layout_marginTop="@dimen/padding_small"
    android:layout_marginBottom="@dimen/padding_small"
    app:cardCornerRadius="4dp"
    app:cardElevation="4dp" >

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingTop="@dimen/activity_vertical_margin" >

    <TextView
        android:id="@+id/tvName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="@dimen/padding_small"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <ImageView
        android:id="@+id/ivPicture"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tvName"
        android:layout_centerHorizontal="true"
        android:scaleType="fitCenter" />

    <TextView
        android:id="@+id/tvDetail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/ivPicture"
        android:layout_centerHorizontal="true"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin" />
</RelativeLayout>

Questions:
Answers:

check hardwareAccelerated in manifest make it true , making it false removes shadows , when false shadow appears in xml preview but not in phone .

Questions:
Answers:

You can try by adding this line

 card_view:cardUseCompatPadding="true"

The Whole code will seems like this

  <android.support.v7.widget.CardView 
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_margin="5dp"
        android:orientation="horizontal"
        card_view:cardUseCompatPadding="true"
        card_view:cardCornerRadius="5dp">
 </android.support.v7.widget.CardView

Questions:
Answers:

You can add this line of code for shadow in card view

card_view:cardElevation="3dp"

Below you have an example

<android.support.v7.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:id="@+id/card_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardBackgroundColor="@android:color/white"
    android:foreground="?android:attr/selectableItemBackground"
    card_view:cardElevation="3dp"
    card_view:cardCornerRadius="4dp">

Hope this helps!

Questions:
Answers:

First of all make sure that following dependencies are proper added and compiled in build.gradle file

    dependencies {
    ...
    compile 'com.android.support:cardview-v7:21.0.+'

    }

and after this try the following code :

     <android.support.v7.widget.CardView 
            xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:card_view="http://schemas.android.com/apk/res-auto"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:layout_margin="5dp"
            android:orientation="horizontal"
            card_view:cardCornerRadius="5dp">
     </android.support.v7.widget.CardView

problem rises in Android L beacuse layout_margin attribute is not added

Questions:
Answers:

In my case the shadow was not showing on Android L devices because I did not add a margin. The problem is that the CardView creates this margin automatically on <5 devices so now I do it like this:

CardView card = new CardView(context);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
        LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
if (Build.VERSION_CODES.LOLLIPOP == Build.VERSION.SDK_INT) {
    params.setMargins(shadowSize, shadowSize, shadowSize,
            shadowSize);
} else {
    card.setMaxCardElevation(shadowSize);
}
card.setCardElevation(shadowSize);
card.setLayoutParams(params);

Questions:
Answers:

Simply add this tags:

app:cardElevation="2dp"
app:cardUseCompatPadding="true"

So its become:

<android.support.v7.widget.CardView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:cardBackgroundColor="?colorPrimary"
    app:cardCornerRadius="3dp"
    app:cardElevation="2dp"
    app:cardUseCompatPadding="true"
    app:contentPadding="1dp" />

Questions:
Answers:

move your “uses-sdk” attribute in top of the manifest like the below answer https://stackoverflow.com/a/27658827/1394139

Questions:
Answers:

My recyclerview was slow in loading so by reading the stackoverflow.com I changed hardwareAccelerated to “false” then the elevation is not showing in the device. The I changed back to true. It works for me.