Null object reference while get last messages from channel object - Twilio programmable chat Android SDK

Question

So it's about getting,

java.lang.NullPointerException

while using Twilio programable chat SDK in Android

I have one fragment where I am getting the list of the channel, On the click of the particular channel I am passing the channel sid from fragment to activity and in the activity, I am getting the channel from client again by using that sid, but when I am trying to get last messages from the channel then I am getting

java.lang.NullPointerException: Attempt to invoke virtual method 'void com.twilio.chat.Messages.getLastMessages(int, com.twilio.chat.CallbackListener)' on a null object reference

And the mystery is When I use "attach a debugger to the android process", I can see the error I can get object and messages also with debugger on. I believe this is something to do with threading.

Here is the code

myChannel.getMessages().getLastMessages(50, new CallbackListener<List<Message>>() {
                          @Override
                          public void onSuccess(List<Message> messages) {
                              mMessagesAdapter.setMessages(mMessages);
                              setMessageInputEnabled(true);
                              mWriteMessageEditText.requestFocus();
                          }

                          @Override
                          public void onError(ErrorInfo errorInfo) {
                              Log.e(TAG, "error" + errorInfo.getMessage());

                          }
                      });

Also, I came to know with the doc of Twilio that, I have to use synchronized method over the Channel object. with the method "myChannel.getMessages()". doc-link: URL I am attaching a screenshot: enter image description here

And I believe I have to do synchronization first with using some method, but I do not see any method for that. How can I synchronize? What code Should I use?

Please help me. Thanks in advance

First join() on channel then you can use this inside status listener — Balu Sangem, Jan 30 '19 at 07:32
I tried in that way, it gives me member already exist error because i already joined in previous fragment — user10988556, Jan 30 '19 at 07:36
Did you check synchronization status before calling getMessages()? — Balu Sangem, Jan 30 '19 at 07:42
Yes, it's giving me com.twilio.chat.Channel.SynchronizationStatus.ALL =(3) — user10988556, Jan 30 '19 at 07:45
I implement the getChannelMessage function in onSynchronizationChanged method if (mChannel.getSynchronizationStatus() == Channel.SynchronizationStatus.ALL), now it's working but it's taking time — user10988556, Jan 30 '19 at 08:57

Null object reference while get last messages from channel object - Twilio programmable chat Android SDK

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