I've noticed that some apps when you click on something like edittext has a carriage return while others have a next button in place of a carriage return. I think the carriage return in the default so I'm wondering how you change it to a next button.
If you have more edittext fields on a layout and want to replace the carriage return with a next button you can change the IME options in the layout xml:
<EditText android:imeOptions="actionNext" ....></EditText>
This will change the focus to the next edittext field.
Read more about it here: http://developer.android.com/resources/articles/on-screen-inputs.html