在使用android.support.design.widget.CoordinatorLayout时摆脱标题栏而不影响样本布局的渲染

I have got the most recent version of Android Studio. After I made a new application with it using a Blank Activity, I got 2 layouts for the MainActivity(or MyActivity as its referred to in the official tutorial). There seems to be a activity_my.xml which includes content_my.xml. I have got the most recent version of Android S