Ways to remove title bars and fullscreen

Method One: The code must be joined before Setcontentview (R.layout.activity_main)

Remove title bar
Requestwindowfeature (Window.feature_no_title);
Fullscreen
GetWindow (). SetFlags (WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

Method Two: Add the <activity tag in the manifest file

<!--remove the title bar--

Android:theme= "@android: Style/theme.notitlebar"
<!--remove the title bar and fullscreen--
Android:theme= "@android: Style/theme.notitlebar.fullscreen"

Both of the above methods can only be one activity to remove the title bar and fullscreen, how to let all the activity is canceled?

In the <<application tab in the manifest file, change theme to

<!--remove the title bar--

Android:theme= "@android: Style/theme.notitlebar"
<!--remove the title bar and fullscreen--
Android:theme= "@android: Style/theme.notitlebar.fullscreen"

Ways to remove title bars and fullscreen