'CardView cardElevation draws random square inside of CardView

A simple problem, I used a CardView to add elevation to a Button but when assigning cardElevation , then the CardView draws a box inside of itself, I tried switching the elevation and other attributes and I can minimize the effect of it by increasing the cardElevation but that is not a solution.

Here is the CardView from the XML.

  <androidx.cardview.widget.CardView
            android:layout_width="38sp"
            android:layout_height="38sp"
            app:cardElevation="5sp"
            android:layout_gravity="end"
            android:layout_marginTop="60sp"
            android:layout_marginRight="12sp"
            android:layout_marginEnd="12sp"
            app:cardBackgroundColor="#97FFFFFF"></androidx.cardview.widget.CardView>

The CardView in the app. (The box in the upper right corner)

enter image description here

The whole XML file, the last CardView is the one on the image.

<?xml version="1.0" encoding="utf-8"?>
<com.flipboard.bottomsheet.BottomSheetLayout
    android:id="@+id/bottomsheet"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.map.MapFragment">

    <LinearLayout
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:orientation="vertical">

    <androidx.cardview.widget.CardView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:cardElevation="20dp"
        android:layout_gravity="end"
        android:layout_marginTop="60dp"
        android:layout_marginRight="12dp"
        android:layout_marginEnd="12dp"
        app:cardBackgroundColor="#97FFFFFF">

      <ImageButton
          android:layout_width="38dp"
          android:layout_height="38dp"
          android:padding="1dp"
          android:src="@drawable/ic_baseline_refresh_24"
          android:background="#00FFFFFF"
          android:elevation="10dp"
          android:id="@+id/btn_reset_map"/>
    </androidx.cardview.widget.CardView>
        
        <androidx.cardview.widget.CardView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:cardElevation="20dp"
            android:layout_gravity="end"
            android:layout_marginTop="10dp"
            android:layout_marginRight="12dp"
            android:layout_marginEnd="12dp"
            app:cardBackgroundColor="#97FFFFFF">

            <ImageButton
                android:layout_width="38dp"
                android:layout_height="38dp"
                android:padding="1dp"
                android:src="@drawable/ic_baseline_layers_24"
                android:background="#00FFFFFF"
                android:elevation="10dp"
                android:id="@+id/btn_layer_map"/>
        </androidx.cardview.widget.CardView>

        <androidx.cardview.widget.CardView
            android:layout_width="38dp"
            android:layout_height="38dp"
            app:cardElevation="5dp"
            android:layout_gravity="end"
            android:layout_marginTop="40dp"
            android:layout_marginRight="12dp"
            android:layout_marginEnd="12dp"
            app:cardBackgroundColor="#97FFFFFF"></androidx.cardview.widget.CardView>

    </LinearLayout>
</fragment>

</com.flipboard.bottomsheet.BottomSheetLayout>
javaandroidandroid-cardviewcardview


Solution 1:[1]

You can set the CardView background color programmatically to the same color as the color set with app:cardBackgroundColor

CardView cardview = findViewById(R.id.cardview);
cardview.setBackgroundColor(ContextCompat.getColor(this, R.color.cardview_color));

And create this color in colors.xml

<color name="cardview_color">#97FFFFFF</color>

And add this id to the xml:

  <androidx.cardview.widget.CardView
      android:id="@+id/cardview"
      ....

Note: For some reason android:background="#97FFFFFF" doesn't work

Solution 2:[2]

Setting android:outlineProvider="none" fixed the issue for me

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Vasily Kabunov

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