Added in API level 24

MessagingStyle

open class MessagingStyle : Notification.Style
kotlin.Any
   ↳ android.app.Notification.Style
   ↳ android.app.Notification.MessagingStyle

Helper class for generating large-format notifications that include multiple back-and-forth messages of varying types between any number of people.

If the platform does not provide large-format notifications, this method has no effect. The user will always see the normal notification view.

If the app is targeting Android android.os.Build.VERSION_CODES#P and above, it is required to use the Person class in order to get an optimal rendering of the notification and its avatars. For conversations involving multiple people, the app should also make sure that it marks the conversation as a group with setGroupConversation(boolean).

From Android android.os.Build.VERSION_CODES#UPSIDE_DOWN_CAKE, messaging style notifications that are associated with a valid conversation shortcut (via Notification.Builder.setShortcutId(String)) are displayed in a dedicated conversation section in the shade above non-conversation alerting and silence notifications. To be a valid conversation shortcut, the shortcut must be a ShortcutInfo.Builder.setLongLived(boolean) dynamic or cached sharing shortcut.

This class is a "rebuilder": It attaches to a Builder object and modifies its behavior. Here's an example of how this may be used: 

Person user = new Person.Builder().setIcon(userIcon).setName(userName).build();
  MessagingStyle style = new MessagingStyle(user)
       .addMessage(messages[1].getText(), messages[1].getTime(), messages[1].getPerson())
       .addMessage(messages[2].getText(), messages[2].getTime(), messages[2].getPerson())
       .setGroupConversation(hasMultiplePeople());
 
  Notification noti = new Notification.Builder()
      .setContentTitle("2 new messages with " + sender.toString())
      .setContentText(subject)
      .setSmallIcon(R.drawable.new_message)
      .setLargeIcon(aBitmap)
      .setStyle(style)
      .build();

Summary

Nested classes

Constants
static Int

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

MessagingStyle(userDisplayName: CharSequence)
Public methods
open Notification.MessagingStyle!

Adds a Message for historic context in this notification.
open Notification.MessagingStyle!

Adds a Message for display in this notification.
open Notification.MessagingStyle!
addMessage(text: CharSequence, timestamp: Long, sender: Person?)

Adds a message for display by this notification.
open Notification.MessagingStyle!
addMessage(text: CharSequence!, timestamp: Long, sender: CharSequence!)

Adds a message for display by this notification.
open CharSequence?

Return the title to be displayed on this conversation.
open MutableList<Notification.MessagingStyle.Message!>!

Gets the list of historic Messages in the notification.
open MutableList<Notification.MessagingStyle.Message!>!

Gets the list of Message objects that represent the notification.
open Person

open CharSequence!

Returns the name to be displayed for any replies sent by the user
open Boolean

Returns true if this notification represents a group conversation, otherwise false.
open Notification.MessagingStyle!
setConversationTitle(conversationTitle: CharSequence?)

Sets the title to be displayed on this conversation.
open Notification.MessagingStyle!
setGroupConversation(isGroupConversation: Boolean)

Sets whether this conversation notification represents a group.
Inherited functions
Inherited properties

Constants

MAXIMUM_RETAINED_MESSAGES

Added in API level 24
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

MessagingStyle

Added in API level 28
MessagingStyle(user: Person)
Parameters
user Person: Required - The person displayed for any messages that are sent by the user. Any messages added with addMessage(android.app.Notification.MessagingStyle.Message) who don't have a Person associated with it will be displayed as if they were sent by this user. The user also needs to have a valid name associated with it, which is enforced starting in Android android.os.Build.VERSION_CODES#P. This value cannot be null.

MessagingStyle

Added in API level 24
MessagingStyle(userDisplayName: CharSequence)

Deprecated: use MessagingStyle(Person)

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(android.app.Notification.MessagingStyle.Message) This value cannot be null.

Public methods

addHistoricMessage

Added in API level 26
open fun addHistoricMessage(message: Notification.MessagingStyle.Message!): Notification.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 Notification.MessagingStyle.Message!: The historic Message to be added
Return
Notification.MessagingStyle! this object for method chaining

addMessage

Added in API level 24
open fun addMessage(message: Notification.MessagingStyle.Message!): Notification.MessagingStyle!

Adds a Message for display in this notification.

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

Multiple Messages in a row with the same timestamp and sender may be grouped as a single message. This means an app should represent a message that has both an image and text as two Message objects, one with the image (and fallback text), and the other with the message text. For consistency, a text message (if any) should be provided after Uri content.

Parameters
message Notification.MessagingStyle.Message!: The Message to be displayed
Return
Notification.MessagingStyle! this object for method chaining

addMessage

Added in API level 28
open fun addMessage(
    text: CharSequence, 
    timestamp: Long, 
    sender: Person?
): Notification.MessagingStyle!

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

Parameters
text CharSequence: A CharSequence to be displayed as the message content This value cannot be null.
timestamp Long: Time in milliseconds at which the message arrived
sender Person?: The Person who sent the message. Should be null for messages by the current user, in which case the platform will insert the user set in MessagingStyle(Person).
Return
Notification.MessagingStyle! this object for method chaining

addMessage

Added in API level 24
Deprecated in API level 28
open fun addMessage(
    text: CharSequence!, 
    timestamp: Long, 
    sender: CharSequence!
): Notification.MessagingStyle!

Deprecated: use addMessage(java.lang.CharSequence,long,android.app.Person)

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

Parameters
text CharSequence!: A CharSequence to be displayed as the message content
timestamp Long: Time in milliseconds at which the message arrived
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
Notification.MessagingStyle! this object for method chaining

getConversationTitle

Added in API level 24
open fun getConversationTitle(): CharSequence?

Return the title to be displayed on this conversation. May return null.

getHistoricMessages

Added in API level 26
open fun getHistoricMessages(): MutableList<Notification.MessagingStyle.Message!>!

Gets the list of historic Messages in the notification.

getMessages

Added in API level 24
open fun getMessages(): MutableList<Notification.MessagingStyle.Message!>!

Gets the list of Message objects that represent the notification.

getUser

Added in API level 28
open fun getUser(): Person
Return
Person the user to be displayed for any replies sent by the user This value cannot be null.

getUserDisplayName

Added in API level 24
Deprecated in API level 28
open fun getUserDisplayName(): CharSequence!

Deprecated: use getUser() instead

Returns the name to be displayed for any replies sent by the user

isGroupConversation

Added in API level 28
open fun isGroupConversation(): Boolean

Returns true if this notification represents a group conversation, otherwise false.

If the application that generated this MessagingStyle targets an SDK version less than Build.VERSION_CODES.P, this method becomes dependent on whether or not the conversation title is set; returning true if the conversation title is a non-null value, or false otherwise. From Build.VERSION_CODES.P forward, this method returns what's set by setGroupConversation(boolean) allowing for named, non-group conversations.

setConversationTitle

Added in API level 24
open fun setConversationTitle(conversationTitle: CharSequence?): Notification.MessagingStyle!

Sets the title to be displayed on this conversation. May be set to null.

Starting in Build.VERSION_CODES.R, this conversation title will be ignored if a valid shortcutId is added via Notification.Builder.setShortcutId(String). In this case, ShortcutInfo.getLongLabel() (or, if missing, ShortcutInfo.getShortLabel()) will be shown as the conversation title instead.

This API's behavior was changed in SDK version Build.VERSION_CODES.P. If your application's target version is less than Build.VERSION_CODES.P, setting a conversation title to a non-null value will make isGroupConversation() return true and passing null will make it return false. In Build.VERSION_CODES.P and beyond, use setGroupConversation(boolean) to set group conversation status.

Parameters
conversationTitle CharSequence?: Title displayed for this conversation This value may be null.
Return
Notification.MessagingStyle! this object for method chaining

setGroupConversation

Added in API level 28
open fun setGroupConversation(isGroupConversation: Boolean): Notification.MessagingStyle!

Sets whether this conversation notification represents a group. If the app is targeting Android P, this is required if the app wants to display the largeIcon set with Notification.Builder.setLargeIcon(Bitmap), otherwise it will be hidden.

Parameters
isGroupConversation Boolean: true if the conversation represents a group, false otherwise.
Return
Notification.MessagingStyle! this object for method chaining