Add bubble confirmation prompt

@ the app level if the global level is off

Test: robotests
Bug: 129068779
Change-Id: I94acb334dc9879cd372a2a0dfa8e9508fbf1c316

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

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2019 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 android.content.Context;
+import android.database.ContentObserver;
+import android.net.Uri;
+import android.os.Handler;
+import android.os.Looper;
+import android.provider.Settings;
+
+public class GlobalBubblePermissionObserverMixin extends ContentObserver {
+
+    public interface Listener {
+        void onGlobalBubblePermissionChanged();
+    }
+
+    private final Context mContext;
+    private final Listener mListener;
+
+    public GlobalBubblePermissionObserverMixin(Context context, Listener listener) {
+        super(new Handler(Looper.getMainLooper()));
+        mContext = context;
+        mListener = listener;
+    }
+
+    @Override
+    public void onChange(boolean selfChange, Uri uri) {
+        if (mListener != null) {
+            mListener.onGlobalBubblePermissionChanged();
+        }
+    }
+
+    public void onStart() {
+        mContext.getContentResolver().registerContentObserver(
+                Settings.Secure.getUriFor(
+                        Settings.Secure.NOTIFICATION_BUBBLES),
+                false /* notifyForDescendants */,
+                this /* observer */);
+    }
+
+    public void onStop() {
+        mContext.getContentResolver().unregisterContentObserver(this /* observer */);
+    }
+}