放在自定義dialog中即可

@Override
public void onStart() {
super.onStart();
Window window = this.getWindow();

//Window window = getDialog().getWindow();如果是在activity中則用這段程式碼
window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
//window.requestWindowFeature(Window.FEATURE_NO_TITLE); 用在activity中，去標題
int uiOptions =View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
	|View.SYSTEM_UI_FLAG_LAYOUT_STABLE
	|View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
	|View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
	|View.SYSTEM_UI_FLAG_IMMERSIVE
	|View.SYSTEM_UI_FLAG_FULLSCREEN
 

window.getDecorView().setSystemUiVisibility(uiOptions);
}