Java .jar files in and of themselves wouldn't have all of the Android app framework needed to run as an Android app (.apk) file.
You'd need to load your Java source into an IDE (integrated development environment) like Eclipse, add-in the Android plug-ins, and then put your source code into the proper layout and framework that would allow you to have a working app. Here's a few sites that might begin to help fill-in the blanks for you:
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