eclipse库导入jar文件问题

I have a eclipse related question which maybe someone could help me with. I have download and extracted a library from github and want to import it into my application. It gives you two test applications with the library. I make new projects from the existing file systems in eclipse but the two sample projects have a big red exclamation mark next to them and won't run. It says that it can't find the jar file in the library. When I look in the library's bin folder there is no jar file there. I don't really know what I am doing wrong. I am not extracting the file from github properly? Do I have to create my own jar file from the library? I remember having this problem before with another library I tried to use. Any help would be much appreciated! Cheers, Sam. PS this is the library I am trying to use I have a eclipse related question which maybe s