Creating an Android Activity via Eclipse:

• Double click on AndroidManifest.xml in the package explorer.
• Click on the “Application” tab of the manifest editor
• Click on “Add..” under the “Application Nodes” heading (bottom left of the screen)
• Choose Activity from the list in the dialog that pops up (if you have the option, you want to create a new top-level element)
• Click on the “Name*” link under the “Attributes for” header (bottom right of the window) to create a class for the new activity.

When you click Finish from the new class dialog, it’ll take you to your new activity class so you can start coding.