feat(whiteboard): use Material Card style

not my favorite background color, but at least it isn't completely white

Author: BrayanDSO

AnkiDroid/src/main/res/layout/fragment_whiteboard.xml

@@ -14,7 +14,7 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"/>
 
-    <androidx.cardview.widget.CardView
+    <com.google.android.material.card.MaterialCardView
         android:id="@+id/controls_container"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -24,8 +24,7 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constrainedWidth="true"
-        app:cardElevation="@dimen/study_screen_elevation"
-        app:cardCornerRadius="16dp"
+        style="@style/CardView.ViewerStyle"
         android:clickable="true"
         android:focusable="true"
         app:rippleColor="@android:color/transparent">
@@ -122,5 +121,5 @@
             </FrameLayout>
         </LinearLayout>
 
-    </androidx.cardview.widget.CardView>
+    </com.google.android.material.card.MaterialCardView>
 </androidx.constraintlayout.widget.ConstraintLayout>

AnkiDroid/src/main/res/layout/popup_brush_options.xml

@@ -1,11 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
+<com.google.android.material.card.MaterialCardView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    app:cardCornerRadius="8dp"
-    app:cardElevation="@dimen/study_screen_elevation">
+    style="@style/CardView.ViewerStyle">
 
     <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="wrap_content"
@@ -52,4 +51,4 @@
             app:iconTint="@null" />
 
     </androidx.constraintlayout.widget.ConstraintLayout>
-</androidx.cardview.widget.CardView>
+</com.google.android.material.card.MaterialCardView>

AnkiDroid/src/main/res/layout/popup_eraser_options.xml

@@ -1,11 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
+<com.google.android.material.card.MaterialCardView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="360dp"
     android:layout_height="wrap_content"
-    app:cardCornerRadius="8dp"
-    app:cardElevation="@dimen/study_screen_elevation">
+    style="@style/CardView.ViewerStyle">
 
     <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
@@ -72,5 +71,5 @@
             app:thumbHeight="24dp"
             app:tickVisible="false" />
     </androidx.constraintlayout.widget.ConstraintLayout>
-</androidx.cardview.widget.CardView>
+</com.google.android.material.card.MaterialCardView>