Eclipse show warnings in my first android project

I am using Eclipse indigo, android sdk 开发者_JAVA技巧8 (android api 2.2). When i create a new android project using

Name:Bucky

Package: com.theboston.android.bucky

eclipse shows a yellow triangle on the Project. The yellow triangle eventually becomes red

A simple java project ansuljava works well.

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You can use the eclipse problem view to explore any issues with your projects.

Go to Window->Show View->Other->Problems

you can also use Window->Show View->Markers, but this one is more cluttered with less problematic stuff.

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Project > Clean > Clean Project

This will force Eclipse to regenerate some of the code and rebuild everything. Wait a few seconds, then the red flag(s) should go away.