You want to add digital clock but dont want be add calendar component. Why because its like big code to first create a component than write code for get time in writable format to textview. really it’s too long process. But here is a two lines of code to add clock on your project.
To add digital clock add a linear were you want add digital clock and write code in onCreate or if you want clock after clicking than write this code in onclick.
final DigitalClock dc = new DigitalClock(this); linear1.addView (dc);