Don't show bubble settings when framework doesn't support it

Some devices don't support bubbles by configuring config_supportsBubble
value. When the value is set false, it doesn't make sense to show bubble
related preferences.

This CL disables showing bubble preferences when device doesn't support
it.

Bug: 274711609
Test: Set config_supportsBubble false, and check UI.
Test: m -j80 RunSettingsRoboTests ROBOTEST_FILTER="Bubble"
Change-Id: I670ad2a9e243819ea014e5e1ddb9d62ad76d2168

src/com/android/settings/notification/BubbleHelper.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 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.notification;
+
+import static android.provider.Settings.Secure.NOTIFICATION_BUBBLES;
+
+import android.app.ActivityManager;
+import android.content.Context;
+import android.content.res.Resources;
+import android.provider.Settings;
+
+/**
+ * Helper class for configuring notification bubbles.
+ */
+public class BubbleHelper {
+
+    /**
+     * {@link Settings.Secure.NOTIFICATION_BUBBLES} is enabled.
+     */
+    public static final int SYSTEM_WIDE_ON = 1;
+
+    /**
+     * {@link Settings.Secure.NOTIFICATION_BUBBLES} is disabled.
+     */
+    public static final int SYSTEM_WIDE_OFF = 0;
+
+    /**
+     * Returns true if the device supports bubbles.
+     */
+    public static boolean isSupportedByDevice(Context context) {
+        ActivityManager am = context.getSystemService(ActivityManager.class);
+        if (am.isLowRamDevice()) {
+            return false;
+        }
+        if (!Resources.getSystem().getBoolean(com.android.internal.R.bool.config_supportsBubble)) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Returns true if the device supports bubbles and the global settings is enabled.
+     */
+    public static boolean isEnabledSystemWide(Context context) {
+        if (!isSupportedByDevice(context)) {
+            return false;
+        }
+        return Settings.Secure.getInt(context.getContentResolver(), NOTIFICATION_BUBBLES,
+                SYSTEM_WIDE_ON) == SYSTEM_WIDE_ON;
+    }
+}