Refine the preference layout for homepage

Based on the Android S design, we update the layout
for homepage.

The scope covers the layout of preference and icons itself.

- Change the icon size for IA items.
- Change the layout spacing of preference.
- Change the margin or search bar.

Test: See the screen and confirm with UX
Bug: 177213699
Change-Id: I985966fdf39a5989d51991aa3c06ea5fd31e8fe2

src/com/android/settings/display/TopLevelWallpaperPreferenceController.java

@@ -25,6 +25,7 @@ import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.os.UserHandle;
 import android.text.TextUtils;
+import android.util.FeatureFlagUtils;
 import android.util.Log;
 
 import androidx.preference.Preference;
@@ -32,6 +33,8 @@ import androidx.preference.PreferenceScreen;
 
 import com.android.settings.R;
 import com.android.settings.core.BasePreferenceController;
+import com.android.settings.core.FeatureFlags;
+import com.android.settings.homepage.RestrictedHomepagePreference;
 import com.android.settingslib.RestrictedLockUtilsInternal;
 import com.android.settingslib.RestrictedTopLevelPreference;
 
@@ -89,7 +92,11 @@ public class TopLevelWallpaperPreferenceController extends BasePreferenceControl
 
     @Override
     public void updateState(Preference preference) {
-        disablePreferenceIfManaged((RestrictedTopLevelPreference) preference);
+        if (FeatureFlagUtils.isEnabled(mContext, FeatureFlags.SILKY_HOME)) {
+            disablePreferenceIfManaged((RestrictedHomepagePreference) preference);
+        } else {
+            disablePreferenceIfManaged((RestrictedTopLevelPreference) preference);
+        }
     }
 
     @Override
@@ -133,4 +140,18 @@ public class TopLevelWallpaperPreferenceController extends BasePreferenceControl
             }
         }
     }
+
+    private void disablePreferenceIfManaged(RestrictedHomepagePreference pref) {
+        final String restriction = DISALLOW_SET_WALLPAPER;
+        if (pref != null) {
+            pref.setDisabledByAdmin(null);
+            if (RestrictedLockUtilsInternal.hasBaseUserRestriction(mContext,
+                    restriction, UserHandle.myUserId())) {
+                // Do not show the admin dialog for system restriction.
+                pref.setEnabled(false);
+            } else {
+                pref.checkRestrictionAndSetDisabled(restriction);
+            }
+        }
+    }
 }