Answer 1, authority 100%
& lt; activity
android: name = ". MyActivity"
android: theme = "@ android: style / Theme.NoTitleBar" / & gt;
add to manifest
Answer 2, authority 99%
in the onCreate of the desired activity before
super.onCreate (savedInstanceState); // & lt; & lt; it is
requestWindowFeature (Window.FEATURE_NO_TITLE); // & lt; & lt; insert it here
setContentView (R.layout.about_screen); // & lt; & lt; it is