Getting data in recyclerView - mysql

Question

i am getting messages from the database into a recycler view but i want to refresh the recycler view every second for to adding different for to getting new messages in recycler view
But i haver an error of getting data please see it https://www.filemail.com/d/izhittgyibvcjxx
my code is
boolean refresh;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message_user);
refresh = true;
content();
}
public void content()
{
getdata();
if (refresh)
{
refresh(100);
}
}
private void refresh(int milliseconds)
{
final Handler handler = new Handler();
final Runnable runnable = new Runnable() {
#Override
public void run() {
content();
}
};
handler.postDelayed(runnable,milliseconds);
}
private void getdata()
{
String Choice = "Get Messages";
Call<List<responsemodel>> call = SplashScreen.apiInterface.getfullprofiledata(Choice,Message_To,Message_From);
call.enqueue(new Callback<List<responsemodel>>() {
#Override
public void onResponse(Call<List<responsemodel>> call, Response<List<responsemodel>> response) {
List<responsemodel> data = response.body();
Message_user_Adapter adapter = new Message_user_Adapter(data,Message_To);
messages_Message_user_RecyclerView.setAdapter(adapter);
messages_Message_user_RecyclerView.smoothScrollToPosition(messages_Message_user_RecyclerView.getAdapter().getItemCount());
}
#Override
public void onFailure(Call<List<responsemodel>> call, Throwable t) {
}
});
}