通过代码控制隐藏
隐藏布局控件:
findViewById(R.id.FaceActivity_ConstraintLayoutBar).setVisibility(View.GONE);
隐藏图标:
mButtonMobilePhone.setVisibility(View.GONE);
隐藏状态栏:
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);