Have you tried it? 안되면 될때까지

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 를 코드에 추가해주면 된다. 아래와 같이 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_splash); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);