Problems with new Android project

I tried to uninstall and re install the SDK and ADT and now when I'm trying to create a new project with the ADT on Build Target it notifies "No target availabl开发者_如何学编程e".

What to do?

---

To develop an Android application, you also need to download at least one Android platform and the SDK Platform-tools

Have you done that? If no, open the Android SDK and AVD Manager (in Eclipse, Window menu) and download an Android platform. More info here.