What is an activity as it relates to an Android application?

This is an example of a follow-up question. The interviewer uses a follow-up question to explore a topic in more detail. It can be asked immediately after a related question or sometime later in the interview. If asked later in the interview, the interviewer may be trying to calibrate your answers to make sure you are being consistent. This is why you need to answer all questions directly and honestly and not fabricate any answer that you may not know.