想要移除狀態列

import android.view.WindowManager;
this.getWindow().setFlags(
WindowManager.LayoutParams.FLAG_FULLSCREEN,
WndowManager.LayoutParams.FLAG_FULLSCREEN);

想要移除標題列

import android.view.Window;
requestWindowFeature(Window.FEATURE_NO_TITLE);

想要設定螢幕的旋轉方向

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);