I don't follow. Are you asking how to send an email that does not show the sender's address? If so, that has nothing to do with Android. If you're asking something different, please be more elaborate what that is.
This is my app.I don't need to show my email to users.So i give them to chance to contatc me via email.So i tried with above as hard coding my email.But when users try to send a email to me,it shows my email address.is there a way to hide it?
If you send an email, then it will show the address to which it is sent; there's no way around that, and that's entirely independent of Android.
Why do you want to offer a method to contact you via email if you don't want to show your email address? That seems a strange way of going about things. Maybe email isn't the right approach for this purpose.