Thank you for your contribution. There are a lot of code which is commented out, it would be better if you just clean up your files.

And also where you are checking //These are sets of conditions for submit button visibility, here you have added three if else statement, I think you can actually club that in one if statement.

//These are sets of conditions for submit button visibility
if (dy > 0 && linearLayoutManager.findLastVisibleItemPosition() ==
   playQuizAdapter.getItemCount() - 1) {
   submitButton.setVisibility(View.VISIBLE);
} else if(dy == 0 && linearLayoutManager.findLastVisibleItemPosition() == 0 && (playQuizAdapter.getItemCount() - 1) == 0){
  submitButton.setVisibility(View.VISIBLE);
} else if(dy == 0 && linearLayoutManager.findLastVisibleItemPosition() == 1 && (playQuizAdapter.getItemCount() - 1) == 1){
   submitButton.setVisibility(View.VISIBLE);
} else {
 submitButton.setVisibility(View.GONE);
}

You can actually check if dy >= 0 amd then inside that you can write one more if statement, thus it will save some time of execution.

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