title: Stop watch with current time in android studio using Java language
body: <p>I want to make stopwatch with current time. I have two button id is <code>btn1</code> and <code>btn2</code>. I want that when I click on button one it should start calculation time from current device time and when I click on stop it should stop with calculating difference between start and stop time. For example let current time is 10.00 my stop watch calculation time from 10.00 and when I stop it the time is 10 .15 . Then it should show the time is 15 minute of work with current start and stop time. I am using Android Studio with <strong>Java</strong> language. Please any body help me</p>