title: How to kill process by clicking back button in Android?
body: <p>I have made an application in android .It is an application related to timer.Now i have tried a lot to put controll on back button of android device that when it is pressed the process should be killed and directly displays main menu...Please help me...Thanking you in advance..!<img src="https://i.stack.imgur.com/0bKDq.png" alt="enter image description here"></p>