[Expressive Battery] Update screen on time text preference style.

For expressive style:
- Update the enlarge font size
- Remove the background

Bug: 349652542
Test: visual
Flag: com.android.settingslib.widget.theme.flags.is_expressive_design_enabled
Change-Id: If85d2903eec6d1f7c3b58e71daef2409325ac83d

res/layout/preference_text_view.xml

@@ -18,8 +18,8 @@
           android:id="@+id/text"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
-          android:layout_marginStart="24dp"
-          android:layout_marginTop="8dp"
+          android:paddingStart="?android:attr/listPreferredItemPaddingStart"
+          android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
           android:textAlignment="viewStart"
           android:textAppearance="?android:attr/textAppearanceSmall"
           android:textColor="?android:attr/textColorPrimary" />

src/com/android/settings/fuelgauge/batteryusage/ScreenOnTimeController.java

@@ -30,6 +30,7 @@ import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.core.BasePreferenceController;
 import com.android.settings.fuelgauge.BatteryUtils;
+import com.android.settingslib.widget.SettingsThemeHelper;
 
 import java.util.Locale;
 import java.util.regex.Matcher;
@@ -119,10 +120,11 @@ public class ScreenOnTimeController extends BasePreferenceController {
         }
 
         final SpannableString spannableText = new SpannableString(text);
+        final int enlargeFontSizeDp = SettingsThemeHelper.isExpressiveTheme(context) ? 64 : 36;
         final Matcher matcher = NUMBER_PATTERN.matcher(text);
         while (matcher.find()) {
             spannableText.setSpan(
-                    new AbsoluteSizeSpan(36, true /* dip */),
+                    new AbsoluteSizeSpan(enlargeFontSizeDp, true /* dip */),
                     matcher.start(),
                     matcher.end(),
                     Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

src/com/android/settings/fuelgauge/batteryusage/TextViewPreference.java

@@ -25,9 +25,10 @@ import androidx.preference.PreferenceViewHolder;
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.settings.R;
+import com.android.settingslib.widget.GroupSectionDividerMixin;
 
 /** A preference for a single text view. */
-public class TextViewPreference extends Preference {
+public class TextViewPreference extends Preference implements GroupSectionDividerMixin {
     private static final String TAG = "TextViewPreference";
 
     @VisibleForTesting CharSequence mText;