Question: You can find the project here: <https://github.com/googlesamples/cardboard>

The last time I worked with android was about a year ago and I'm trying to use this VR project to get back into it. All I want to do is mess around with the app to get a feel for it. 

However, I haven't been able to get it running. I installed a fresh copy of Eclipse (juno) with the JDK and android SDK and got the android 4.4W stuff from the SDK manager. I also made a Nexus 5 AVD. 

My problem is that I've tried choosing multiple 'root' folders to 'import as existing android project' and none of them have been runnable. Each time the eclipse terminal gives an 'Installation error: Unknown failure' error after installing 'MainActivity.apk'. 

I figured the 'main' folder would be most likely to work since it has the manifest and all the other folders associated with android projects. 

How do I get it running?

Answer: 
That is not an Eclipse project. It is for use with Android Studio and Gradle. Your choices are:

* Switch to Android Studio, or
* See if somebody else has already reorganized that code into an Eclipse project, or
* Attempt to reorganize it yourself, moving the contents of `src/main/` into appropriate locations and fixing up the manifest for things that are set now in `build.gradle`, or
* Find something else as a project to get back into Android development
This alternative worked for me: <https://github.com/raasun/treasurehunt>

It's pretty much the same as the Cardboard sample project from Google except that it's compiled with Eclipse/ANT instead of Android Studio/gradle.

Just follow the first part of moyheen's instructions to set it up.