Much simpler than sniffing keys: try setting android:singleLine="true" and android:imeOptions="actionNext" (at least for single-line entry textviews). Read more in the Android documentation for TextView.
Update: singleLine is deprecated now, but you can leave it out. It’s the default behavior for editable text as long as you don’t explicitly set android:inputType="textMultiLine", and inputType overrides the suggested singleLine replacement of maxLines="1" for editable text anyways.