Hi. If you just check out the code from either google source or github, the relative path between each project is a kind of wrong.
If you use the repo utility,you will not bother about that. After running repo sync ,the work space will be just right. Just import all the project in the directory ,in the instruction's situation, you can just import the bin directory.
Then select all the projects and run build all in your eclipse , DaDa , it will build the app for you.