Hides Flash Notifications illustration on tablet

Since tablet illustrations are not yet finalized, we'll hide the Flash
Notifications illustration on tablet for now.

Bug: 280748155
Test: checks the UI on phone and tablet manually
Change-Id: I5a309dec3291f3585cc1d9769e2465c94250fa7f

res/xml/flash_notifications_settings.xml

@@ -27,7 +27,8 @@
     <com.android.settingslib.widget.IllustrationPreference
         android:key="flash_notifications_illustration"
         settings:searchable="false"
-        settings:lottie_rawRes="@drawable/flash_notifications_illustration" />
+        settings:lottie_rawRes="@drawable/flash_notifications_illustration"
+        settings:controller="com.android.settings.accessibility.FlashNotificationIllustrationPreferenceController"/>
 
     <SwitchPreference
         android:key="camera_flash_notification_preference"

src/com/android/settings/accessibility/FlashNotificationIllustrationPreferenceController.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.accessibility;
+
+import android.content.Context;
+import android.os.SystemProperties;
+import android.util.ArraySet;
+
+import com.android.settings.core.BasePreferenceController;
+
+import java.util.Collections;
+import java.util.Set;
+
+/** Preference controller for illustration in flash notifications page. */
+public class FlashNotificationIllustrationPreferenceController extends BasePreferenceController {
+
+    public FlashNotificationIllustrationPreferenceController(Context context,
+            String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        // TODO(b/280748155): Update tablet illustration when it's available. Hide it for now.
+        String characteristics = SystemProperties.get("ro.build.characteristics");
+        String[] characteristicsSplit = characteristics.split(",");
+        Set<String> productCharacteristics = new ArraySet<>(characteristicsSplit.length);
+        Collections.addAll(productCharacteristics, characteristicsSplit);
+        final boolean isTablet = productCharacteristics.contains("tablet");
+        return isTablet ? UNSUPPORTED_ON_DEVICE : AVAILABLE;
+    }
+}