I am aware that other people have tried to resolve this issue but have thus far found a suitable answer.
The error is, on start up, eclipse gets hung up on \"Android SDK
This has happened to me before.There are errors in the libraries related to the Google App Engine project, what you need to do is close Eclipse, go to your workspace and move every other project not related to the Google App Engine project to another location on your computer, then start Eclipse and make sure you resolve all the issues with the backend project ,then copy the other projects back to your workspace.