1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.dialer.notification; 18 19 import android.app.Notification; 20 import android.app.NotificationManager; 21 import android.content.Context; 22 import android.service.notification.StatusBarNotification; 23 import android.support.annotation.NonNull; 24 import android.text.TextUtils; 25 import com.android.dialer.common.Assert; 26 import com.android.dialer.common.LogUtil; 27 import com.android.dialer.logging.DialerImpression; 28 import com.android.dialer.logging.Logger; 29 import java.util.ArrayList; 30 import java.util.Collections; 31 import java.util.Comparator; 32 import java.util.List; 33 34 /** 35 * Utility to ensure that only a certain number of notifications are shown for a particular 36 * notification type. Once the limit is reached, older notifications are cancelled. 37 */ 38 /* package */ class NotificationThrottler { 39 /** 40 * For gropued bundled notifications, the system UI will only display the last 8. For grouped 41 * unbundled notifications, the system displays all notifications until a global maximum of 50 is 42 * reached. 43 */ 44 private static final int MAX_NOTIFICATIONS_PER_TAG = 10; 45 46 private static final int HIGH_GLOBAL_NOTIFICATION_COUNT = 45; 47 48 private static boolean didLogHighGlobalNotificationCountReached; 49 throttle(@onNull Context context, @NonNull Notification notification)50 /* package */ static void throttle(@NonNull Context context, @NonNull Notification notification) { 51 Assert.isNotNull(context); 52 Assert.isNotNull(notification); 53 54 // No limiting for non-grouped notifications. 55 String groupKey = notification.getGroup(); 56 if (TextUtils.isEmpty(groupKey)) { 57 return; 58 } 59 60 NotificationManager notificationManager = context.getSystemService(NotificationManager.class); 61 StatusBarNotification[] activeNotifications = notificationManager.getActiveNotifications(); 62 if (activeNotifications.length > HIGH_GLOBAL_NOTIFICATION_COUNT 63 && !didLogHighGlobalNotificationCountReached) { 64 LogUtil.i( 65 "NotificationThrottler.throttle", 66 "app has %d notifications, system may suppress future notifications", 67 activeNotifications.length); 68 didLogHighGlobalNotificationCountReached = true; 69 Logger.get(context) 70 .logImpression(DialerImpression.Type.HIGH_GLOBAL_NOTIFICATION_COUNT_REACHED); 71 } 72 73 // Count the number of notificatons for this group (excluding the summary). 74 int count = 0; 75 for (StatusBarNotification currentNotification : activeNotifications) { 76 if (isNotificationInGroup(currentNotification, groupKey)) { 77 count++; 78 } 79 } 80 81 if (count > MAX_NOTIFICATIONS_PER_TAG) { 82 LogUtil.i( 83 "NotificationThrottler.throttle", 84 "groupKey: %s is over limit, count: %d, limit: %d", 85 groupKey, 86 count, 87 MAX_NOTIFICATIONS_PER_TAG); 88 List<StatusBarNotification> notifications = getSortedMatchingNotifications(context, groupKey); 89 for (int i = 0; i < (count - MAX_NOTIFICATIONS_PER_TAG); i++) { 90 notificationManager.cancel(notifications.get(i).getTag(), notifications.get(i).getId()); 91 } 92 } 93 } 94 getSortedMatchingNotifications( @onNull Context context, @NonNull String groupKey)95 private static List<StatusBarNotification> getSortedMatchingNotifications( 96 @NonNull Context context, @NonNull String groupKey) { 97 List<StatusBarNotification> notifications = new ArrayList<>(); 98 NotificationManager notificationManager = context.getSystemService(NotificationManager.class); 99 for (StatusBarNotification notification : notificationManager.getActiveNotifications()) { 100 if (isNotificationInGroup(notification, groupKey)) { 101 notifications.add(notification); 102 } 103 } 104 Collections.sort( 105 notifications, 106 new Comparator<StatusBarNotification>() { 107 @Override 108 public int compare(StatusBarNotification left, StatusBarNotification right) { 109 return Long.compare(left.getPostTime(), right.getPostTime()); 110 } 111 }); 112 return notifications; 113 } 114 isNotificationInGroup( @onNull StatusBarNotification notification, @NonNull String groupKey)115 private static boolean isNotificationInGroup( 116 @NonNull StatusBarNotification notification, @NonNull String groupKey) { 117 // Don't include group summaries. 118 if ((notification.getNotification().flags & Notification.FLAG_GROUP_SUMMARY) != 0) { 119 return false; 120 } 121 122 return TextUtils.equals(groupKey, notification.getNotification().getGroup()); 123 } 124 NotificationThrottler()125 private NotificationThrottler() {} 126 } 127