Install Eclipse with ADT plugin
Eclipse is freely downloadable from the official website, but ADT plugin is not actively developed and there isn't any official download link for it. Please consider migrating to Android Studio.
Some information for the download is still available on Eclipse marketplace.
Install Datalogic SDK Add-on
From Eclipse ADT menu, click Windows > Android SDK Manager to open Android SDK Manager
Click Tools > Manage Add-on Sites...
Select the tab User Defined Sites and click New...
In the new window Add Add-on Site URL insert the following URL