cometchat.java

CometChat.init(this, "APP_ID", new CometChat.CallbackListener<String>() {
  @Override
  public void onSuccess(String successMessage) {
    Log.d(TAG, "Initialization completed successfully");
  }
});

TextMessage textMessage = new TextMessage(
  "#General",
  "Hi everyone",
  CometChatConstants.MESSAGE_TYPE_TEXT,
  CometChatConstants.RECEIVER_TYPE_GROUP);

CometChat.sendMessage(textMessage, new CometChat.CallbackListener<TextMessage>() {
  @Override
  public void onSuccess(TextMessage textMessage) {
    Log.d(TAG, "Message sent successfully: " + textMessage.toString());
  }
});

CometChat.addMessageListener("#General", new CometChat.MessageListener() {
  @Override
  public void onTextMessageReceived(TextMessage textMessage) {
    Log.d(TAG, "Text message received successfully: " + textMessage.toString());
  }
});