Messaging: Implement per conversation channels. Update API level to 28.

* Get rid of in-app settings for notifications, replaced by channels features
* Remove all the notification plumbing and dead code

Test: m, manual

Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Signed-off-by: Joey <joey@lineageos.org>
Signed-off-by: Danny Baumann <dannybaumann@web.de>
Signed-off-by: Arne Coucheron <arco68@gmail.com>
Signed-off-by: Lyubo <lyubodzhamov@gmail.com>
Change-Id: Idb39ca32751d40b3376934775d2119dd6cc7e297

src/com/android/messaging/util/NotificationsUtil.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2019 The LineageOS 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.messaging.util;
+
+import android.app.NotificationChannel;
+import android.app.NotificationChannelGroup;
+import android.app.NotificationManager;
+import android.content.Context;
+import android.os.Build;
+
+public final class NotificationsUtil {
+    public static final String DEFAULT_CHANNEL_ID = "messaging_channel";
+    public static final String CONVERSATION_GROUP_NAME = "conversation_group";
+
+    private NotificationsUtil() {
+    }
+
+    public static void createNotificationChannel(Context context, String id,
+            int titleResId, int priority, String groupId) {
+        String title = context.getString(titleResId);
+        createNotificationChannel(context, id, title, priority, groupId);
+    }
+
+    public static void createNotificationChannel(Context context, String id,
+            String title, int priority, String groupId) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            return;
+        }
+
+        NotificationManager manager = context.getSystemService(NotificationManager.class);
+        NotificationChannel existing = manager.getNotificationChannel(id);
+        if (existing != null) {
+            return;
+        }
+
+        NotificationChannel newChannel = new NotificationChannel(id, title, priority);
+        newChannel.enableLights(true);
+        if (groupId != null) {
+            newChannel.setGroup(groupId);
+        }
+        manager.createNotificationChannel(newChannel);
+    }
+
+    public static void deleteNotificationChannel(Context context, String id) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            return;
+        }
+
+        NotificationManager manager = context.getSystemService(NotificationManager.class);
+        manager.deleteNotificationChannel(id);
+    }
+
+    public static void createNotificationChannelGroup(Context context, String id,
+            int titleResId) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            return;
+        }
+
+        NotificationManager manager = context.getSystemService(NotificationManager.class);
+        NotificationChannelGroup existing = manager.getNotificationChannelGroup(id);
+        if (existing != null) {
+            return;
+        }
+
+        String title = context.getString(titleResId);
+        NotificationChannelGroup newChannelGroup = new NotificationChannelGroup(id, title);
+        manager.createNotificationChannelGroup(newChannelGroup);
+    }
+
+    public static NotificationChannel getNotificationChannel(Context context, String id) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            return null;
+        }
+
+        NotificationManager manager = context.getSystemService(NotificationManager.class);
+        return manager.getNotificationChannel(id);
+    }
+
+    public static NotificationChannelGroup getNotificationChannelGroup(Context context, String id) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            return null;
+        }
+
+        NotificationManager manager = context.getSystemService(NotificationManager.class);
+        return manager.getNotificationChannelGroup(id);
+    }
+}