Bubble settings: feature, notification, app

* Removed setting from developer options
* Removed bubble settings from normal notifications /
  channels

* Feature available via notification setting
* Feature screen with educational gif

* App level is now a tri-state choice of all / selected /
  none
* App level bubble controls are accessible top-level in
  app notifications

Test: make -j40 RunSettingsRoboTests ROBOTEST_FILTER="Bubble"
Bug: 138116133
Change-Id: Id103e9d3717fdc9b86a916be40c43cda9c35ac34

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

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2020 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.Global.NOTIFICATION_BUBBLES;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.annotation.VisibleForTesting;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+/**
+ * Summary of the feature setting for bubbles, available through notification menu.
+ */
+public class BubbleSummaryNotificationPreferenceController extends BasePreferenceController {
+
+    @VisibleForTesting
+    static final int ON = 1;
+
+    public BubbleSummaryNotificationPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return mContext.getString(
+                areBubblesEnabled()
+                        ? R.string.notifications_bubble_setting_on_summary
+                        : R.string.switch_off_text);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    private boolean areBubblesEnabled() {
+        return Settings.Global.getInt(mContext.getContentResolver(),
+                NOTIFICATION_BUBBLES, ON) == ON;
+    }
+}