Question

I have a button named Check In. My aim is on click to change the text and start counting the time. The timer has to stop at the next click. It should give the time taken between the two button clicks.

Answer 1

On the first click create a variable:

long startTime = System.currentTimeMillis();

Then on the second click you can calculate the difference:

long difference = System.currentTimeMillis() - startTime;

difference / 1000 will give you the difference in seconds. Hope this helps.