Chat21 is the core of the open source live chat platform Tiledesk.com.

Chat21 SDK Demo

Features

With Chat21 Android SDK you can:

Send a direct message to a user (one to one message)
Emoji support
Attach pictures support
Create group chat
View the messages history
View the group list
The read receipts feature allows your users to see when a message has been sent, delivered and read
Conversations list view with the last messages sent (like Whatsapp)
With the Presense Manager you can view when a user is online or offline and the inactivity period
View the user profile with fullname and email
Login with email and password (Use firebase email and password authentication method )
Signup with fullname, email, password and profile picture
Contacts list view with fulltext search for fullname field

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Follow the readme to add the Chat21 SDK to your project

More details at http://www.chat21.org/

Remember to rename the value of applicationId "tiledesk.android" into build.gradle