–> Once you run your program in Eclipse, an APK file is automatically created.
This APK file is installed on your AVD.

–> You can access this APK file in the /bin directory of your current project.

–> Every time you run your program the old APK file would be replaced and
the application is reinstalled in your AVD automatically.

–> You can copy this APK file to your real time device and then
install this application.

–> In some devices you have to change the application installtion settings.

–> Settings -> Applications -> Install from Untrusted Sources.

–> You can always uninstall the application in the Application Manager.