By making "Intent" to a second activity, I need to type "screen back" to display the layout of the second activity

Good morning. Android: When I call a second activity from a first activity, the screen stays gray mobile and until we give the key "back screen" not the layout associated with the second activity appears me. If when I'm gray screen look at the Logcat in the latest Eclipse that appears to me it is: "PhoneWindow DecorView setVisiblity: visibility = 4" in black (no error). But if I do not give a "back screen" on my mobile the layout of the second activity does not appear. Why? ... What happened? ... The two activitys are given in the manifest. Thank you.