private static final int SCREEN_ON_FLAGS = (
WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
// | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
);

public void onCreate(Bundle data, Bundle restoreState) {
super.onCreate(data, restoreState);
// mFlags |= (FLAG_HIDE_ACTION_BAR | FLAG_HIDE_STATUS_BAR
// | FLAG_ALLOW_LOCK_WHILE_SCREEN_ON | FLAG_SHOW_WHEN_LOCKED);
mFlags |= (FLAG_HIDE_ACTION_BAR | FLAG_HIDE_STATUS_BAR
| FLAG_ALLOW_LOCK_WHILE_SCREEN_ON );
...
}