CardView 不会在 RecyclerView 内投射阴影

Question

I've tried all the stuff. my manifest is

 <application
        android:hardwareAccelerated="true" 

my layout is :

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="240dp"
    android:layout_height="200dp">
    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="8dp"
        android:layout_above="@+id/tvName"
        сard_view:elevation="4dp"
        xmlns:сard_view="http://schemas.android.com/apk/res-auto"
        сard_view:cardUseCompatPadding="true"
        сard_view:cardCornerRadius="5dp">

        <ImageView
            android:id="@+id/ivPoster"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="centerCrop"
            android:adjustViewBounds="true"/>

    </androidx.cardview.widget.CardView>
    <TextView
        android:id="@+id/tvName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="bottom|center_horizontal"
        android:layout_alignParentBottom="true"
        android:minLines="1"
        android:singleLine="true"
        android:ellipsize="marquee"
        android:textSize="16sp"
        android:layout_marginBottom="16dp"/>
</RelativeLayout>

So, inside RecyclerView with grid layout doesn't show any shadow, although it shows it in Android Studio shows shadow in preview

Answer 1

I think it's because ImageView overlaps shadows of the cardview, when you set images on your ImageView in the adapter. Give the image view some margin and shadow will show (but it will be ugly xD). For testing I display 2 of the Cardviewbut but gave first one src. here is the result:

as you can see first one has no shadows.