From Android's Developer Documentation on Managing Projects from Eclipse with ADT:
Next, set the project's Properties to indicate that it is a library project:
- In the Package Explorer, right-click the library project and select Properties.
- In the Properties window, select the "Android" properties group at left and locate the Library properties at right.
- Select the "is Library" checkbox and click Apply.
- Click OK to close the Properties window.
So, open your project properties, un-select the "Is Library" checkbox, and click Apply to make your project a normal Android project (not a library project).