MessagingStyle

Kotlin |Java

open class MessagingStyle : NotificationCompat.Style

kotlin.Any
↳	androidx.core.app.NotificationCompat.Style
	↳	androidx.core.app.NotificationCompat.MessagingStyle

Helper class for generating large-format notifications that include multiple back-and-forth messages of varying types between any number of people.
In order to get a backwards compatible behavior, the app needs to use the v7 version of the notification builder together with this style, otherwise the user will see the normal notification view.
Use MessagingStyle#setConversationTitle(CharSequence) to set a conversation title for group chats with more than two people. This could be the user-created name of the group or, if it doesn't have a specific name, a list of the participants in the conversation. Do not set a conversation title for one-on-one chats, since platforms use the existence of this field as a hint that the conversation is a group.
This class is a "rebuilder": It attaches to a Builder object and modifies its behavior, like so:

Notification notification = new Notification.Builder()
          .setContentTitle("2 new messages with " + sender.toString())
          .setContentText(subject)
          .setSmallIcon(R.drawable.new_message)
          .setLargeIcon(aBitmap)
          .setStyle(new Notification.MessagingStyle(resources.getString(R.string.reply_name))
              .addMessage(messages[0].getText(), messages[0].getTime(), messages[0].getSender())
              .addMessage(messages[1].getText(), messages[1].getTime(), messages[1].getSender()))
          .build();
      

Summary

Nested classes
	Message

Constants
static Int	MAXIMUM_RETAINED_MESSAGES The maximum number of messages that will be retained in the Notification itself (the number displayed is up to the platform).

Public constructors
<init>(@NonNull userDisplayName: CharSequence)
<init>(@NonNull user: Person) Creates a new MessagingStyle object.

Public methods
open Unit	addCompatExtras(@NonNull extras: Bundle)
open NotificationCompat.MessagingStyle	addHistoricMessage(@Nullable message: NotificationCompat.MessagingStyle.Message?) Adds a Message for historic context in this notification.
open NotificationCompat.MessagingStyle	addMessage(@Nullable text: CharSequence?, timestamp: Long, @Nullable sender: CharSequence?) Adds a message for display by this notification.
open NotificationCompat.MessagingStyle	addMessage(@Nullable text: CharSequence?, timestamp: Long, @Nullable person: Person?) Adds a message for display by this notification.
open NotificationCompat.MessagingStyle	addMessage(@Nullable message: NotificationCompat.MessagingStyle.Message?) Adds a Message for display in this notification.
open static NotificationCompat.MessagingStyle?	extractMessagingStyleFromNotification(@NonNull notification: Notification) Retrieves a MessagingStyle from a Notification, enabling an application that has set a MessagingStyle using NotificationCompat or android.app.Notification.Builder to send messaging information to another application using NotificationCompat, regardless of the API level of the system.
open CharSequence?	getConversationTitle() Return the title to be displayed on this conversation.
open MutableList<NotificationCompat.MessagingStyle.Message!>	getHistoricMessages() Gets the list of historic Messages in the notification.
open MutableList<NotificationCompat.MessagingStyle.Message!>	getMessages() Gets the list of Message objects that represent the notification
open Person	getUser() Returns the person to be used for any replies sent by the user.
open CharSequence?	getUserDisplayName() Returns the name to be displayed for any replies sent by the user.
open Boolean	isGroupConversation() Returns true if this notification represents a group conversation, otherwise false.
open NotificationCompat.MessagingStyle	setConversationTitle(@Nullable conversationTitle: CharSequence?) Sets the title to be displayed on this conversation.
open NotificationCompat.MessagingStyle	setGroupConversation(isGroupConversation: Boolean) Sets whether this conversation notification represents a group.

Inherited functions
From class Style Notification? build() If this Style object has been set on a notification builder, this method will build that notification and return it. Otherwise, it will return null. Unit setBuilder(@Nullable builder: NotificationCompat.Builder?) Link this rich notification style with a notification builder.

Constants

MAXIMUM_RETAINED_MESSAGES

static val MAXIMUM_RETAINED_MESSAGES: Int

The maximum number of messages that will be retained in the Notification itself (the number displayed is up to the platform).

Value: 25

Public constructors

<init>

MessagingStyle(@NonNull userDisplayName: CharSequence)

Deprecated: Use MessagingStyle(Person) instead.

Parameters
userDisplayName	CharSequence: Required - the name to be displayed for any replies sent by the user before the posting app reposts the notification with those messages after they've been actually sent and in previous messages sent by the user added in addMessage(Message)

<init>

MessagingStyle(@NonNull user: Person)

Creates a new MessagingStyle object. Note that Person must have a non-empty name.

Parameters
user	Person: This Person's name will be shown when this app's notification is being replied to. It's used temporarily so the app has time to process the send request and repost the notification with updates to the conversation.

Public methods

addCompatExtras

open fun addCompatExtras(@NonNull extras: Bundle): Unit

addHistoricMessage

@NonNull open fun addHistoricMessage(@Nullable message: NotificationCompat.MessagingStyle.Message?): NotificationCompat.MessagingStyle

Adds a Message for historic context in this notification.

Messages should be added as historic if they are not the main subject of the notification but may give context to a conversation. The system may choose to present them only when relevant, e.g. when replying to a message through a RemoteInput.

The messages should be added in chronologic order, i.e. the oldest first, the newest last.

Parameters
message	NotificationCompat.MessagingStyle.Message?: The historic Message to be added

Return
NotificationCompat.MessagingStyle	this object for method chaining

addMessage

@NonNull open fun addMessage(
    @Nullable text: CharSequence?, 
    timestamp: Long, 
    @Nullable sender: CharSequence?
): NotificationCompat.MessagingStyle

Deprecated: Use addMessage(CharSequence, long, Person) or addMessage(Message)

Adds a message for display by this notification. Convenience call for a simple Message in addMessage(Message)

Parameters
text	CharSequence?: A CharSequence to be displayed as the message content
timestamp	Long: Time at which the message arrived in ms since Unix epoch
sender	CharSequence?: A CharSequence to be used for displaying the name of the sender. Should be null for messages by the current user, in which case the platform will insert getUserDisplayName(). Should be unique amongst all individuals in the conversation, and should be consistent during re-posts of the notification.

Return
NotificationCompat.MessagingStyle	this object for method chaining

See Also

• Message#Message(CharSequence, long, CharSequence)

addMessage

@NonNull open fun addMessage(
    @Nullable text: CharSequence?, 
    timestamp: Long, 
    @Nullable person: Person?
): NotificationCompat.MessagingStyle

Adds a message for display by this notification. Convenience call for addMessage(Message).

Return
NotificationCompat.MessagingStyle	this for method chaining

See Also

• Message#Message(CharSequence, long, Person)

addMessage

@NonNull open fun addMessage(@Nullable message: NotificationCompat.MessagingStyle.Message?): NotificationCompat.MessagingStyle

Adds a Message for display in this notification.

Parameters
message	NotificationCompat.MessagingStyle.Message?: The Message to be displayed

Return
NotificationCompat.MessagingStyle	this object for method chaining

extractMessagingStyleFromNotification

@Nullable open static fun extractMessagingStyleFromNotification(@NonNull notification: Notification): NotificationCompat.MessagingStyle?

Retrieves a MessagingStyle from a Notification, enabling an application that has set a MessagingStyle using NotificationCompat or android.app.Notification.Builder to send messaging information to another application using NotificationCompat, regardless of the API level of the system.

Return
NotificationCompat.MessagingStyle?	null if there is no MessagingStyle set, or if the SDK version is < 16 (JellyBean).

getConversationTitle