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WearNotifications / Application / src / com.example.android.wearable.wear.wearnotifications /

GlobalNotificationBuilder.java

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/*
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Copyright 2016 The Android Open Source Project
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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 */
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package com.example.android.wearable.wear.wearnotifications;
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import android.support.v7.app.NotificationCompat;
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/**
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 * We use a Singleton for a global copy of the NotificationCompat.Builder to update active
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 * Notifications from other Services/Activities.
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 *
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 * You have two options for updating your notifications:
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 *
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 *  1. Use a new NotificationCompatBuilder to create the Notification. This approach requires you
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 *  to get *ALL* the information and pass it to the builder. We get all the information from a Mock
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 *  Database and this is the approach used in the MainActivity.
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 *
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 *  2. Use an existing NotificationCompatBuilder to create a Notification. This approach requires
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 *  you to store a reference to the original builder. The benefit is you only need the new/updated
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 *  information for an existing notification. We use this approach in the IntentService handlers to
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 *  update existing notifications.
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 *
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 *  IMPORTANT NOTE 1: You shouldn't save/modify the resulting Notification object using
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 *  its member variables and/or legacy APIs. If you want to retain anything from update
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 *  to update, retain the Builder as option 2 outlines.
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 *
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 *  IMPORTANT NOTE 2: If the global Notification Builder is lost because the process is killed, you
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 *  should have a way to recreate the Notification Builder from a persistent state. (We do this as
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 *  well in the sample, check the IntentServices.)
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 */
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public final class GlobalNotificationBuilder {
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    private static NotificationCompat.Builder sGlobalNotificationCompatBuilder = null;
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    /*
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     * Empty constructor - We don't initialize builder because we rely on a null state to let us
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     * know the Application's process was killed.
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     */
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    private GlobalNotificationBuilder () { }
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    public static void setNotificationCompatBuilderInstance (NotificationCompat.Builder builder) {
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        sGlobalNotificationCompatBuilder = builder;
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    }
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    public static NotificationCompat.Builder getNotificationCompatBuilderInstance(){
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        return sGlobalNotificationCompatBuilder;
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    }
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}
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