wearable/wear/WearAccessibilityApp/Wearable/src/main/java/com/example/android/wearable/wear/wearaccessibilityapp/NotificationsActivity.java - platform/developers/samples/android - Git at Google

 /*
  * Copyright (C) 2017 Google Inc. All Rights Reserved.
  *
  * 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.example.android.wearable.wear.wearaccessibilityapp;

 import android.app.Notification;
 import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.BitmapFactory;
 import android.os.Build;
 import android.os.Bundle;
 import android.preference.Preference;
 import android.preference.Preference.OnPreferenceChangeListener;
 import android.preference.Preference.OnPreferenceClickListener;
 import android.preference.PreferenceFragment;
 import android.preference.SwitchPreference;
 import android.support.v4.app.FragmentActivity;
 import android.support.v4.app.NotificationCompat;
 import android.support.v4.app.NotificationCompat.MessagingStyle;
 import android.support.v4.app.NotificationManagerCompat;
 import android.support.v4.app.RemoteInput;
 import android.support.v4.content.ContextCompat;
 import android.support.wear.ambient.AmbientModeSupport;
 import android.util.Log;

 public class NotificationsActivity extends FragmentActivity implements
         AmbientModeSupport.AmbientCallbackProvider {

     public static final int NOTIFICATION_ID = 888;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         AmbientModeSupport.attach(this);

         // Display the fragment as the main content.
         getFragmentManager()
                 .beginTransaction()
                 .replace(android.R.id.content, new NotificationsPrefsFragment())
                 .commit();
     }

     public static class NotificationsPrefsFragment extends PreferenceFragment {

         private static final String TAG = "NotificationsActivity";
         private NotificationManagerCompat mNotificationManagerCompat;
         private boolean mActionOn; // if true, displays in-line action
         private boolean mAvatarOn; // if true, displays avatar of messenger

         @Override
         public void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);

             // Load the preferences from an XML resource
             addPreferencesFromResource(R.xml.prefs_notifications);

             mNotificationManagerCompat = NotificationManagerCompat.from(getActivity());

             final SwitchPreference mActionSwitchPref =
                     (SwitchPreference) findPreference(getString(R.string.key_pref_action));
             final SwitchPreference mAvatarSwitchPref =
                     (SwitchPreference) findPreference(getString(R.string.key_pref_avatar));
             Preference mPushNotificationPref =
                     findPreference(getString(R.string.key_pref_push_notification));

             initInLineAction(mActionSwitchPref);
             initAvatar(mAvatarSwitchPref);
             initPushNotification(mPushNotificationPref);
         }

         public void initInLineAction(SwitchPreference switchPref) {
             switchPref.setChecked(true);
             mActionOn = switchPref.isChecked();
             switchPref.setOnPreferenceChangeListener(
                     new OnPreferenceChangeListener() {
                         @Override
                         public boolean onPreferenceChange(Preference preference, Object newValue) {
                             mActionOn = (Boolean) newValue;
                             return true;
                         }
                     });
         }

         public void initAvatar(SwitchPreference switchPref) {
             switchPref.setChecked(true);
             mAvatarOn = switchPref.isChecked();
             switchPref.setOnPreferenceChangeListener(
                     new OnPreferenceChangeListener() {
                         @Override
                         public boolean onPreferenceChange(Preference preference, Object newValue) {
                             mAvatarOn = (Boolean) newValue;
                             return true;
                         }
                     });
         }

         public void initPushNotification(Preference pref) {
             pref.setOnPreferenceClickListener(
                     new OnPreferenceClickListener() {
                         @Override
                         public boolean onPreferenceClick(Preference preference) {
                             generateMessagingStyleNotification(getContext());
                             return true;
                         }
                     });
         }

         /*
          * Generates a MESSAGING_STYLE Notification that supports both Wear 1.+ and Wear 2.0. For
          * devices on API level 24 (Wear 2.0) and after, displays MESSAGING_STYLE. Otherwise,
          * displays a basic BIG_TEXT_STYLE.
          *
          * IMPORTANT NOTE:
          * Notification Styles behave slightly different on Wear 2.0 when they are launched by a
          * native/local Wear app, i.e., they will NOT expand when the user taps them but will
          * instead take the user directly into the local app for the richest experience. In
          * contrast, a bridged Notification launched from the phone will expand with the style
          * details (whether there is a local app or not).
          *
          * If you want to enable an action on your Notification without launching the app, you can
          * do so with the setHintDisplayActionInline() feature (shown below), but this only allows
          * one action.
          *
          * If you wish to replicate the original experience of a bridged notification, please
          * review the generateBigTextStyleNotification() method above to see how.
          */
         private void generateMessagingStyleNotification(Context context) {
             Log.d(TAG, "generateMessagingStyleNotification()");

             // Main steps for building a MESSAGING_STYLE notification:
             //      0. Get your data
             //      1. Retrieve Notification Channel for O and beyond devices (26+)
             //      2. Build the MESSAGING_STYLE
             //      3. Set up main Intent for notification
             //      4. Set up RemoteInput (users can input directly from notification)
             //      5. Build and issue the notification

             // 0. Get your data (everything unique per Notification).
             MockDatabase.MessagingStyleCommsAppData messagingStyleCommsAppData =
                     MockDatabase.getMessagingStyleData();

             // 1. Create/Retrieve Notification Channel for O and beyond devices (26+).
             String notificationChannelId =
                     createNotificationChannel(context, messagingStyleCommsAppData);

             // 2. Build the Notification.Style (MESSAGING_STYLE)
             String contentTitle = messagingStyleCommsAppData.getContentTitle();

             MessagingStyle messagingStyle =
                     new NotificationCompat.MessagingStyle(
                                     messagingStyleCommsAppData.getReplayName())
                             // You could set a different title to appear when the messaging style
                             // is supported on device (24+) if you wish. In our case, we use the
                             // same
                             // title.
                             .setConversationTitle(contentTitle);

             // Adds all Messages
             // Note: Messages include the text, timestamp, and sender
             for (MessagingStyle.Message message : messagingStyleCommsAppData.getMessages()) {
                 messagingStyle.addMessage(message);
             }

             // 3. Set up main Intent for notification
             Intent notifyIntent = new Intent(getActivity(), MessagingMainActivity.class);

             PendingIntent mainPendingIntent =
                     PendingIntent.getActivity(
                             getActivity(), 0, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);

             // 4. Set up a RemoteInput Action, so users can input (keyboard, drawing, voice)
             // directly from the notification without entering the app.

             // Create the RemoteInput specifying this key.
             String replyLabel = getString(R.string.reply_label);
             RemoteInput remoteInput =
                     new RemoteInput.Builder(MessagingIntentService.EXTRA_REPLY)
                             .setLabel(replyLabel)
                             .build();

             // Create PendingIntent for service that handles input.
             Intent replyIntent = new Intent(getActivity(), MessagingIntentService.class);
             replyIntent.setAction(MessagingIntentService.ACTION_REPLY);
             PendingIntent replyActionPendingIntent =
                     PendingIntent.getService(getActivity(), 0, replyIntent, 0);

             // Enable action to appear inline on Wear 2.0 (24+). This means it will appear over the
             // lower portion of the Notification for easy action (only possible for one action).
             final NotificationCompat.Action.WearableExtender inlineActionForWear2 =
                     new NotificationCompat.Action.WearableExtender()
                             .setHintDisplayActionInline(mActionOn)
                             .setHintLaunchesActivity(false);

             NotificationCompat.Action replyAction =
                     new NotificationCompat.Action.Builder(
                                     R.drawable.reply, replyLabel, replyActionPendingIntent)
                             .addRemoteInput(remoteInput)
                             // Allows system to generate replies by context of conversation
                             .setAllowGeneratedReplies(true)
                             // Add WearableExtender to enable inline actions
                             .extend(inlineActionForWear2)
                             .build();

             // 5. Build and issue the notification

             // Because we want this to be a new notification (not updating current notification),
             // we create a new Builder. Later, we update this same notification, so we need to save
             // this Builder globally (as outlined earlier).

             // Notification Channel Id is ignored for Android pre O (26).
             NotificationCompat.Builder notificationCompatBuilder =
                     new NotificationCompat.Builder(context, notificationChannelId);

             GlobalNotificationBuilder.setNotificationCompatBuilderInstance(
                     notificationCompatBuilder);

             // Builds and issues notification
             notificationCompatBuilder
                     // MESSAGING_STYLE sets title and content for Wear 1.+ and Wear 2.0 devices.
                     .setStyle(messagingStyle)
                     .setContentTitle(contentTitle)
                     .setContentText(messagingStyleCommsAppData.getContentText())
                     .setSmallIcon(R.drawable.watch)
                     .setContentIntent(mainPendingIntent)
                     .setColor(ContextCompat.getColor(context, R.color.background))
                     .setDefaults(NotificationCompat.DEFAULT_ALL)

                     // Number of new notifications for API <24 (Wear 1.+) devices
                     .setSubText(
                             Integer.toString(messagingStyleCommsAppData.getNumberOfNewMessages()))
                     .addAction(replyAction)
                     .setCategory(Notification.CATEGORY_MESSAGE)

                     // Sets priority for 25 and below. For 26 and above, 'priority' is deprecated
                     // for 'importance' which is set in the NotificationChannel. The integers
                     // representing 'priority' are different from 'importance', so make sure you
                     // don't mix them.
                     .setPriority(messagingStyleCommsAppData.getPriority())

                     // Sets lock-screen visibility for 25 and below. For 26 and above, lock screen
                     // visibility is set in the NotificationChannel.
                     .setVisibility(messagingStyleCommsAppData.getChannelLockscreenVisibility());

             notificationCompatBuilder.setLargeIcon(
                     BitmapFactory.decodeResource(
                             getResources(), mAvatarOn ? R.drawable.avatar : R.drawable.watch));

             // If the phone is in "Do not disturb mode, the user will still be notified if
             // the sender(s) is starred as a favorite.
             for (String name : messagingStyleCommsAppData.getParticipants()) {
                 notificationCompatBuilder.addPerson(name);
             }

             Notification notification = notificationCompatBuilder.build();
             mNotificationManagerCompat.notify(NOTIFICATION_ID, notification);

             // Close app to demonstrate notification in steam.
             getActivity().finish();
         }

         private String createNotificationChannel(
                 Context context, MockDatabase.MessagingStyleCommsAppData mockNotificationData) {

             // NotificationChannels are required for Notifications on O (API 26) and above.
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

                 // The id of the channel.
                 String channelId = mockNotificationData.getChannelId();

                 // The user-visible name of the channel.
                 CharSequence channelName = mockNotificationData.getChannelName();
                 // The user-visible description of the channel.
                 String channelDescription = mockNotificationData.getChannelDescription();
                 int channelImportance = mockNotificationData.getChannelImportance();
                 boolean channelEnableVibrate = mockNotificationData.isChannelEnableVibrate();
                 int channelLockscreenVisibility =
                         mockNotificationData.getChannelLockscreenVisibility();

                 // Initializes NotificationChannel.
                 NotificationChannel notificationChannel =
                         new NotificationChannel(channelId, channelName, channelImportance);
                 notificationChannel.setDescription(channelDescription);
                 notificationChannel.enableVibration(channelEnableVibrate);
                 notificationChannel.setLockscreenVisibility(channelLockscreenVisibility);

                 // Adds NotificationChannel to system. Attempting to create an existing notification
                 // channel with its original values performs no operation, so it's safe to perform
                 // the below sequence.
                 NotificationManager notificationManager =
                         (NotificationManager)
                                 context.getSystemService(Context.NOTIFICATION_SERVICE);
                 notificationManager.createNotificationChannel(notificationChannel);

                 return channelId;
             } else {
                 // Returns null for pre-O (26) devices.
                 return null;
             }
         }
     }

     @Override
     public AmbientModeSupport.AmbientCallback getAmbientCallback() {
         return new MyAmbientCallback();
     }

     private class MyAmbientCallback extends AmbientModeSupport.AmbientCallback {}
 }
	/*
	* Copyright (C) 2017 Google Inc. All Rights Reserved.
	*
	* 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.example.android.wearable.wear.wearaccessibilityapp;

	import android.app.Notification;
	import android.app.NotificationChannel;
	import android.app.NotificationManager;
	import android.app.PendingIntent;
	import android.content.Context;
	import android.content.Intent;
	import android.graphics.BitmapFactory;
	import android.os.Build;
	import android.os.Bundle;
	import android.preference.Preference;
	import android.preference.Preference.OnPreferenceChangeListener;
	import android.preference.Preference.OnPreferenceClickListener;
	import android.preference.PreferenceFragment;
	import android.preference.SwitchPreference;
	import android.support.v4.app.FragmentActivity;
	import android.support.v4.app.NotificationCompat;
	import android.support.v4.app.NotificationCompat.MessagingStyle;
	import android.support.v4.app.NotificationManagerCompat;
	import android.support.v4.app.RemoteInput;
	import android.support.v4.content.ContextCompat;
	import android.support.wear.ambient.AmbientModeSupport;
	import android.util.Log;

	public class NotificationsActivity extends FragmentActivity implements
	AmbientModeSupport.AmbientCallbackProvider {

	public static final int NOTIFICATION_ID = 888;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	AmbientModeSupport.attach(this);

	// Display the fragment as the main content.
	getFragmentManager()
	.beginTransaction()
	.replace(android.R.id.content, new NotificationsPrefsFragment())
	.commit();
	}

	public static class NotificationsPrefsFragment extends PreferenceFragment {

	private static final String TAG = "NotificationsActivity";
	private NotificationManagerCompat mNotificationManagerCompat;
	private boolean mActionOn; // if true, displays in-line action
	private boolean mAvatarOn; // if true, displays avatar of messenger

	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	// Load the preferences from an XML resource
	addPreferencesFromResource(R.xml.prefs_notifications);

	mNotificationManagerCompat = NotificationManagerCompat.from(getActivity());

	final SwitchPreference mActionSwitchPref =
	(SwitchPreference) findPreference(getString(R.string.key_pref_action));
	final SwitchPreference mAvatarSwitchPref =
	(SwitchPreference) findPreference(getString(R.string.key_pref_avatar));
	Preference mPushNotificationPref =
	findPreference(getString(R.string.key_pref_push_notification));

	initInLineAction(mActionSwitchPref);
	initAvatar(mAvatarSwitchPref);
	initPushNotification(mPushNotificationPref);
	}

	public void initInLineAction(SwitchPreference switchPref) {
	switchPref.setChecked(true);
	mActionOn = switchPref.isChecked();
	switchPref.setOnPreferenceChangeListener(
	new OnPreferenceChangeListener() {
	@Override
	public boolean onPreferenceChange(Preference preference, Object newValue) {
	mActionOn = (Boolean) newValue;
	return true;
	}
	});
	}

	public void initAvatar(SwitchPreference switchPref) {
	switchPref.setChecked(true);
	mAvatarOn = switchPref.isChecked();
	switchPref.setOnPreferenceChangeListener(
	new OnPreferenceChangeListener() {
	@Override
	public boolean onPreferenceChange(Preference preference, Object newValue) {
	mAvatarOn = (Boolean) newValue;
	return true;
	}
	});
	}

	public void initPushNotification(Preference pref) {
	pref.setOnPreferenceClickListener(
	new OnPreferenceClickListener() {
	@Override
	public boolean onPreferenceClick(Preference preference) {
	generateMessagingStyleNotification(getContext());
	return true;
	}
	});
	}

	/*
	* Generates a MESSAGING_STYLE Notification that supports both Wear 1.+ and Wear 2.0. For
	* devices on API level 24 (Wear 2.0) and after, displays MESSAGING_STYLE. Otherwise,
	* displays a basic BIG_TEXT_STYLE.
	*
	* IMPORTANT NOTE:
	* Notification Styles behave slightly different on Wear 2.0 when they are launched by a
	* native/local Wear app, i.e., they will NOT expand when the user taps them but will
	* instead take the user directly into the local app for the richest experience. In
	* contrast, a bridged Notification launched from the phone will expand with the style
	* details (whether there is a local app or not).
	*
	* If you want to enable an action on your Notification without launching the app, you can
	* do so with the setHintDisplayActionInline() feature (shown below), but this only allows
	* one action.
	*
	* If you wish to replicate the original experience of a bridged notification, please
	* review the generateBigTextStyleNotification() method above to see how.
	*/
	private void generateMessagingStyleNotification(Context context) {
	Log.d(TAG, "generateMessagingStyleNotification()");

	// Main steps for building a MESSAGING_STYLE notification:
	// 0. Get your data
	// 1. Retrieve Notification Channel for O and beyond devices (26+)
	// 2. Build the MESSAGING_STYLE
	// 3. Set up main Intent for notification
	// 4. Set up RemoteInput (users can input directly from notification)
	// 5. Build and issue the notification

	// 0. Get your data (everything unique per Notification).
	MockDatabase.MessagingStyleCommsAppData messagingStyleCommsAppData =
	MockDatabase.getMessagingStyleData();

	// 1. Create/Retrieve Notification Channel for O and beyond devices (26+).
	String notificationChannelId =
	createNotificationChannel(context, messagingStyleCommsAppData);

	// 2. Build the Notification.Style (MESSAGING_STYLE)
	String contentTitle = messagingStyleCommsAppData.getContentTitle();

	MessagingStyle messagingStyle =
	new NotificationCompat.MessagingStyle(
	messagingStyleCommsAppData.getReplayName())
	// You could set a different title to appear when the messaging style
	// is supported on device (24+) if you wish. In our case, we use the
	// same
	// title.
	.setConversationTitle(contentTitle);

	// Adds all Messages
	// Note: Messages include the text, timestamp, and sender
	for (MessagingStyle.Message message : messagingStyleCommsAppData.getMessages()) {
	messagingStyle.addMessage(message);
	}

	// 3. Set up main Intent for notification
	Intent notifyIntent = new Intent(getActivity(), MessagingMainActivity.class);

	PendingIntent mainPendingIntent =
	PendingIntent.getActivity(
	getActivity(), 0, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);

	// 4. Set up a RemoteInput Action, so users can input (keyboard, drawing, voice)
	// directly from the notification without entering the app.

	// Create the RemoteInput specifying this key.
	String replyLabel = getString(R.string.reply_label);
	RemoteInput remoteInput =
	new RemoteInput.Builder(MessagingIntentService.EXTRA_REPLY)
	.setLabel(replyLabel)
	.build();

	// Create PendingIntent for service that handles input.
	Intent replyIntent = new Intent(getActivity(), MessagingIntentService.class);
	replyIntent.setAction(MessagingIntentService.ACTION_REPLY);
	PendingIntent replyActionPendingIntent =
	PendingIntent.getService(getActivity(), 0, replyIntent, 0);

	// Enable action to appear inline on Wear 2.0 (24+). This means it will appear over the
	// lower portion of the Notification for easy action (only possible for one action).
	final NotificationCompat.Action.WearableExtender inlineActionForWear2 =
	new NotificationCompat.Action.WearableExtender()
	.setHintDisplayActionInline(mActionOn)
	.setHintLaunchesActivity(false);

	NotificationCompat.Action replyAction =
	new NotificationCompat.Action.Builder(
	R.drawable.reply, replyLabel, replyActionPendingIntent)
	.addRemoteInput(remoteInput)
	// Allows system to generate replies by context of conversation
	.setAllowGeneratedReplies(true)
	// Add WearableExtender to enable inline actions
	.extend(inlineActionForWear2)
	.build();

	// 5. Build and issue the notification

	// Because we want this to be a new notification (not updating current notification),
	// we create a new Builder. Later, we update this same notification, so we need to save
	// this Builder globally (as outlined earlier).

	// Notification Channel Id is ignored for Android pre O (26).
	NotificationCompat.Builder notificationCompatBuilder =
	new NotificationCompat.Builder(context, notificationChannelId);

	GlobalNotificationBuilder.setNotificationCompatBuilderInstance(
	notificationCompatBuilder);

	// Builds and issues notification
	notificationCompatBuilder
	// MESSAGING_STYLE sets title and content for Wear 1.+ and Wear 2.0 devices.
	.setStyle(messagingStyle)
	.setContentTitle(contentTitle)
	.setContentText(messagingStyleCommsAppData.getContentText())
	.setSmallIcon(R.drawable.watch)
	.setContentIntent(mainPendingIntent)
	.setColor(ContextCompat.getColor(context, R.color.background))
	.setDefaults(NotificationCompat.DEFAULT_ALL)

	// Number of new notifications for API <24 (Wear 1.+) devices
	.setSubText(
	Integer.toString(messagingStyleCommsAppData.getNumberOfNewMessages()))
	.addAction(replyAction)
	.setCategory(Notification.CATEGORY_MESSAGE)

	// Sets priority for 25 and below. For 26 and above, 'priority' is deprecated
	// for 'importance' which is set in the NotificationChannel. The integers
	// representing 'priority' are different from 'importance', so make sure you
	// don't mix them.
	.setPriority(messagingStyleCommsAppData.getPriority())

	// Sets lock-screen visibility for 25 and below. For 26 and above, lock screen
	// visibility is set in the NotificationChannel.
	.setVisibility(messagingStyleCommsAppData.getChannelLockscreenVisibility());

	notificationCompatBuilder.setLargeIcon(
	BitmapFactory.decodeResource(
	getResources(), mAvatarOn ? R.drawable.avatar : R.drawable.watch));

	// If the phone is in "Do not disturb mode, the user will still be notified if
	// the sender(s) is starred as a favorite.
	for (String name : messagingStyleCommsAppData.getParticipants()) {
	notificationCompatBuilder.addPerson(name);
	}

	Notification notification = notificationCompatBuilder.build();
	mNotificationManagerCompat.notify(NOTIFICATION_ID, notification);

	// Close app to demonstrate notification in steam.
	getActivity().finish();
	}

	private String createNotificationChannel(
	Context context, MockDatabase.MessagingStyleCommsAppData mockNotificationData) {

	// NotificationChannels are required for Notifications on O (API 26) and above.
	if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

	// The id of the channel.
	String channelId = mockNotificationData.getChannelId();

	// The user-visible name of the channel.
	CharSequence channelName = mockNotificationData.getChannelName();
	// The user-visible description of the channel.
	String channelDescription = mockNotificationData.getChannelDescription();
	int channelImportance = mockNotificationData.getChannelImportance();
	boolean channelEnableVibrate = mockNotificationData.isChannelEnableVibrate();
	int channelLockscreenVisibility =
	mockNotificationData.getChannelLockscreenVisibility();

	// Initializes NotificationChannel.
	NotificationChannel notificationChannel =
	new NotificationChannel(channelId, channelName, channelImportance);
	notificationChannel.setDescription(channelDescription);
	notificationChannel.enableVibration(channelEnableVibrate);
	notificationChannel.setLockscreenVisibility(channelLockscreenVisibility);

	// Adds NotificationChannel to system. Attempting to create an existing notification
	// channel with its original values performs no operation, so it's safe to perform
	// the below sequence.
	NotificationManager notificationManager =
	(NotificationManager)
	context.getSystemService(Context.NOTIFICATION_SERVICE);
	notificationManager.createNotificationChannel(notificationChannel);

	return channelId;
	} else {
	// Returns null for pre-O (26) devices.
	return null;
	}
	}
	}

	@Override
	public AmbientModeSupport.AmbientCallback getAmbientCallback() {
	return new MyAmbientCallback();
	}

	private class MyAmbientCallback extends AmbientModeSupport.AmbientCallback {}
	}