After upgrading to OS X Yosemite I found that eclipse was not working because JAVA was not properly installed. I installed it and now I am able to open eclipse.
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Similar problem, after upgrading to Yosemite, but with a BlackBerry 10 device running an Android build from Eclipse.
Solution:
Run app and wait for the Android Device Chooser to popup. My dialog showed an empty list.
Whilst the dialog is showing, disconnect and reconnect the device via the BlackBerry adb proxy. After doing so, the BlackBerry device automatically showed up in the dialog and I could choose it and run the build successfully.