I already remove the title in onCreate() method.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(
Nick Butcher and Katherine Kuan wrote a nice Google Plus post about a smoother app launch experience:
https://plus.google.com/+AndroidDevelopers/posts/VVpjo7KDx4H
However, if you want to be compatible with Android versions below API 14 (for example using AppCompat), the only way I could achieve this is by using a separate launch activity using a theme with no actionbar.