Chat

List<String> userIdsList = new ArrayList<String>();
userIdsList.add(mReceiverId);


GroupChannel.createChannelWithUserIds(userIdsList, true, new GroupChannel.GroupChannelCreateHandler() {
            @Override
            public void onResult(GroupChannel groupChannel, SendBirdException e) {
                if (e != null) {
                    // Handle Exception here
                    return;
                }

                mGroupChannel = groupChannel;

                setGeneralChannelHandler();
                
                // Load messages
                loadMessages(groupChannel);
            }
  });
  
private void setGeneralChannelHandler() {
        SendBird.addChannelHandler(channelIdentifier, new SendBird.ChannelHandler() {
            @Override
            public void onMessageReceived(BaseChannel baseChannel, BaseMessage baseMessage) {
                if (mGroupChannel != null && baseChannel.getUrl().equals(mGroupChannel.getUrl())) {
                    if (mMessagesListAdapter != null && baseMessage instanceof UserMessage) {
                        printUserMesage((UserMessage) baseMessage);
                        mGroupChannel.markAsRead();
                        // Set Views here
                    }
                }
            }

            @Override
            public void onReadReceiptUpdated(GroupChannel groupChannel) {
                
            }

            @Override
            public void onTypingStatusUpdated(GroupChannel groupChannel) {
                
            }

            @Override
            public void onUserJoined(GroupChannel groupChannel, User user) {
                
            }

            @Override
            public void onUserLeft(GroupChannel groupChannel, User user) {
                
            }
        });
    }

    private void loadMessages(GroupChannel groupChannel) {
        PreviousMessageListQuery previousMessageListQuery = groupChannel.createPreviousMessageListQuery();
        previousMessageListQuery.load(MAXIMUM_MESSAGES_LOAD, false, new PreviousMessageListQuery.MessageListQueryResult() {
            @Override
            public void onResult(List<BaseMessage> baseMessagesList, SendBirdException e) {
                if (e != null) {
                    // Handle Exception Here
                    return;
                }

                mMessagesList = new ArrayList<UserMessage>();
               // Use the list to set adapters
                }
            }
        });
    }