Upgrading from v3.x to v4 is fairly simple. Below are the major changes that are released as a part of CometChat v4: Please follow the setup instructions to upgrade to the latest V4 version.

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Maven URL Change

allprojects {
  repositories {
    maven {
      url "https://dl.cloudsmith.io/public/cometchat/cometchat/maven/"
    }
  }
}

​
Dependency Change

dependencies {
  implementation 'com.cometchat:chat-sdk-android:4.1.4'
}

​
Change The Import Classes Packages

In v3 the import class package name start from com.cometchat.pro.* . Change it to com.cometchat.chat.* everywhere in the project and you are done with v3 to v4 migration