学习布局设计和把组件添加到容器时控制组件在容器中的位置。编写一个应用程序实现日历的查阅，点击上月和下月两个按钮，查阅不同月份的日历。-Learning the layout design and components are added to the location of control components to the container in the container. Write an application to access the calendar, click on the last month and next month, two buttons, check the calendar of the different months.