'Free up space' uses CardPreference

For material next style.

Bug: 188599776
Test: make RunSettingsRoboTests ROBOTEST_FILTER=CardPreferenceTest
Change-Id: Ibaf4d11ab44017453498676db00cff1e49c83b9d

src/com/android/settings/widget/CardPreference.java

@@ -19,7 +19,9 @@ package com.android.settings.widget;
 import android.content.Context;
 import android.util.AttributeSet;
 
+import androidx.annotation.ColorInt;
 import androidx.preference.Preference;
+import androidx.preference.PreferenceViewHolder;
 
 import com.android.settings.R;
 
@@ -29,6 +31,11 @@ import com.google.android.material.card.MaterialCardView;
  * Preference that wrapped by {@link MaterialCardView}, only support to set icon, title and summary
  */
 public class CardPreference extends Preference {
+
+    private static final @ColorInt int INVALID_COLOR = -1;
+
+    private @ColorInt int mCardBackgroundColor = INVALID_COLOR;
+
     public CardPreference(Context context) {
         this(context, null /* attrs */);
     }
@@ -36,4 +43,23 @@ public class CardPreference extends Preference {
     public CardPreference(Context context, AttributeSet attrs) {
         super(context, attrs, R.attr.cardPreferenceStyle);
     }
+
+    /** Set card background color of the MaterialCardView in CardPreference. */
+    public void setCardBackgroundColor(@ColorInt int color) {
+        if (mCardBackgroundColor == color) {
+            return;
+        }
+        mCardBackgroundColor = color;
+        notifyChanged();
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder view) {
+        super.onBindViewHolder(view);
+
+        if (mCardBackgroundColor != INVALID_COLOR) {
+            final MaterialCardView cardView = (MaterialCardView) view.findViewById(R.id.container);
+            cardView.setCardBackgroundColor(mCardBackgroundColor);
+        }
+    }
 }