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Friend download the sdk from the link below: https://developer.android.com/studio/index.html. Then follow these steps: 1-
6- insert image description here
8 - restart the eclipse as requested and after reboot.
9 - Informing the Android installation directory
Ready, now you have an Android environment in your Eclipse, and to create a new project just go in Menu File>New>Other... eclipse, and select the option Android... From then on it will depend on what you intend to develop.
I hope I’ve helped.
Seems to me a problem with the android plugin eclipse and the sdk you downloaded. Some reason not to use Android Studio?
– Erick Gallani