Designing an Android application is made simple by Google.
just log in to http://appinventor.googlelabs.com with your google account.
In your web browser, go to the App Inventor Web site at http://appinventor.googlelabs.com. If this is the first time you've used App Inventor, you'll see the Projects page, with no projects in it yet. It should look like this:
Create a new projectClick New on the left side, near the top of the page.
Enter the project name and click OK.
The browser will open the Designer, the place where you select components for your app, and should look like this:
Steps for...