setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

设置当前 Activity 的界面为 竖屏。

常用于

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash);
    
    //设置此界面为竖屏
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}