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/*
* Copyright (C) 2017 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.launcher3.notification;
import android.app.Notification;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.service.notification.NotificationListenerService;
import android.service.notification.StatusBarNotification;
import android.support.annotation.Nullable;
import android.support.v4.util.Pair;
import com.android.launcher3.LauncherModel;
import com.android.launcher3.config.FeatureFlags;
import com.android.launcher3.util.PackageUserKey;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* A {@link NotificationListenerService} that sends updates to its
* {@link NotificationsChangedListener} when notifications are posted or canceled,
* as well and when this service first connects. An instance of NotificationListener,
* and its methods for getting notifications, can be obtained via {@link #getInstanceIfConnected()}.
*/
public class NotificationListener extends NotificationListenerService {
private static final int MSG_NOTIFICATION_POSTED = 1;
private static final int MSG_NOTIFICATION_REMOVED = 2;
private static final int MSG_NOTIFICATION_FULL_REFRESH = 3;
private static NotificationListener sNotificationListenerInstance = null;
private static NotificationsChangedListener sNotificationsChangedListener;
private static boolean sIsConnected;
private final Handler mWorkerHandler;
private final Handler mUiHandler;
private Handler.Callback mWorkerCallback = new Handler.Callback() {
@Override
public boolean handleMessage(Message message) {
switch (message.what) {
case MSG_NOTIFICATION_POSTED:
mUiHandler.obtainMessage(message.what, message.obj).sendToTarget();
break;
case MSG_NOTIFICATION_REMOVED:
mUiHandler.obtainMessage(message.what, message.obj).sendToTarget();
break;
case MSG_NOTIFICATION_FULL_REFRESH:
final List<StatusBarNotification> activeNotifications = sIsConnected
? filterNotifications(getActiveNotifications())
: new ArrayList<StatusBarNotification>();
mUiHandler.obtainMessage(message.what, activeNotifications).sendToTarget();
break;
}
return true;
}
};
private Handler.Callback mUiCallback = new Handler.Callback() {
@Override
public boolean handleMessage(Message message) {
switch (message.what) {
case MSG_NOTIFICATION_POSTED:
if (sNotificationsChangedListener != null) {
NotificationPostedMsg msg = (NotificationPostedMsg) message.obj;
sNotificationsChangedListener.onNotificationPosted(msg.packageUserKey,
msg.notificationKey, msg.shouldBeFilteredOut);
}
break;
case MSG_NOTIFICATION_REMOVED:
if (sNotificationsChangedListener != null) {
Pair<PackageUserKey, String> pair
= (Pair<PackageUserKey, String>) message.obj;
sNotificationsChangedListener.onNotificationRemoved(pair.first, pair.second);
}
break;
case MSG_NOTIFICATION_FULL_REFRESH:
if (sNotificationsChangedListener != null) {
sNotificationsChangedListener.onNotificationFullRefresh(
(List<StatusBarNotification>) message.obj);
}
break;
}
return true;
}
};
public NotificationListener() {
super();
mWorkerHandler = new Handler(LauncherModel.getWorkerLooper(), mWorkerCallback);
mUiHandler = new Handler(Looper.getMainLooper(), mUiCallback);
sNotificationListenerInstance = this;
}
public static @Nullable NotificationListener getInstanceIfConnected() {
return sIsConnected ? sNotificationListenerInstance : null;
}
public static void setNotificationsChangedListener(NotificationsChangedListener listener) {
if (!FeatureFlags.BADGE_ICONS) {
return;
}
sNotificationsChangedListener = listener;
if (sNotificationListenerInstance != null) {
sNotificationListenerInstance.onNotificationFullRefresh();
}
}
public static void removeNotificationsChangedListener() {
sNotificationsChangedListener = null;
}
@Override
public void onListenerConnected() {
super.onListenerConnected();
sIsConnected = true;
onNotificationFullRefresh();
}
private void onNotificationFullRefresh() {
mWorkerHandler.obtainMessage(MSG_NOTIFICATION_FULL_REFRESH).sendToTarget();
}
@Override
public void onListenerDisconnected() {
super.onListenerDisconnected();
sIsConnected = false;
}
@Override
public void onNotificationPosted(final StatusBarNotification sbn) {
super.onNotificationPosted(sbn);
mWorkerHandler.obtainMessage(MSG_NOTIFICATION_POSTED, new NotificationPostedMsg(sbn))
.sendToTarget();
}
/**
* An object containing data to send to MSG_NOTIFICATION_POSTED targets.
*/
private class NotificationPostedMsg {
PackageUserKey packageUserKey;
String notificationKey;
boolean shouldBeFilteredOut;
NotificationPostedMsg(StatusBarNotification sbn) {
packageUserKey = PackageUserKey.fromNotification(sbn);
notificationKey = sbn.getKey();
shouldBeFilteredOut = shouldBeFilteredOut(sbn.getNotification());
}
}
@Override
public void onNotificationRemoved(final StatusBarNotification sbn) {
super.onNotificationRemoved(sbn);
Pair<PackageUserKey, String> packageUserKeyAndNotificationKey
= new Pair<>(PackageUserKey.fromNotification(sbn), sbn.getKey());
mWorkerHandler.obtainMessage(MSG_NOTIFICATION_REMOVED, packageUserKeyAndNotificationKey)
.sendToTarget();
}
/** This makes a potentially expensive binder call and should be run on a background thread. */
public List<StatusBarNotification> getNotificationsForKeys(String[] keys) {
StatusBarNotification[] notifications = NotificationListener.this
.getActiveNotifications(keys);
return notifications == null ? Collections.EMPTY_LIST : Arrays.asList(notifications);
}
/**
* Filter out notifications that don't have an intent
* or are headers for grouped notifications.
*
* TODO: use the system concept of a badged notification instead
*/
private List<StatusBarNotification> filterNotifications(
StatusBarNotification[] notifications) {
if (notifications == null) return null;
Set<Integer> removedNotifications = new HashSet<>();
for (int i = 0; i < notifications.length; i++) {
if (shouldBeFilteredOut(notifications[i].getNotification())) {
removedNotifications.add(i);
}
}
List<StatusBarNotification> filteredNotifications = new ArrayList<>(
notifications.length - removedNotifications.size());
for (int i = 0; i < notifications.length; i++) {
if (!removedNotifications.contains(i)) {
filteredNotifications.add(notifications[i]);
}
}
return filteredNotifications;
}
private boolean shouldBeFilteredOut(Notification notification) {
boolean isGroupHeader = (notification.flags & Notification.FLAG_GROUP_SUMMARY) != 0;
return (notification.contentIntent == null || isGroupHeader);
}
public interface NotificationsChangedListener {
void onNotificationPosted(PackageUserKey postedPackageUserKey, String notificationKey,
boolean shouldBeFilteredOut);
void onNotificationRemoved(PackageUserKey removedPackageUserKey, String notificationKey);
void onNotificationFullRefresh(List<StatusBarNotification> activeNotifications);
}
}
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