Need username to disappear when clicking
<p>I am new to android and I was goin through a basic login application in android.
I just wanted to know how to make the "username" disappear when I click the username field like in all the applications we can see.
Now what I have to do is delete the string "username" in the username field and type which I feel is awkward.
Is there anything I can do to implement this feature???</p>

<p>Thanks, in advance</p>
