Receiving Typing Indicators.

TypingIndicator.java

//Sender Side
groupChannel.startTyping(); //Sender Side
groupChannel.endTyping();
...
//Receiver side
// To listen to an update from all the other channel members' client apps, implement the 'onTypingStatusUpdated()' with things to do when notified.
SendBird.addChannelHandler(UNIQUE_HANDLER_ID, new SendBird.ChannelHandler() {
    @Override
    public void onTypingStatusUpdated(GroupChannel groupChannel) {
        if (currentGroupChannel.getUrl().equals(groupChannel.getUrl())) {
            List<User> members = groupChannel.getTypingMembers();
            // Refresh typing status of members within the channel.
        }
    }
});