在android中如何在类文件中以编程方式设置导航抽屉头图像和名称？

In android studio 1.4.1, I have created new Navigation Drawer Project which is default.My issue is in this project there is nav_header_main.xml file which is for navigation header image and name. I want this image and name should be set programmatically in my main class activity. How to do this, I tried lot but the app crashes.In android studio 1.4.1, I have created new Nav