Eclipse

Exporting Android projects as "fat" JARs with dependencies

Go to one of the .java files in your project's package
Add public static void main(String[] args) { } somewhere (will be deleted again later) and save the file
Open the "Run as ..." drop-down menu and choose "Run Configurations"
Right-click on the "Java Application" item in the list on the left and choose "New"
Enter a name, usually your project's name
Choose your project by clicking "Browse ..."
Choose any of your classes (usually there will only be the one we have edited above) as the "Main class" by clicking "Search ..."
Save the configuration by clicking "Apply"
Remove public static void main(String[] args) { } from step two again
Right-click your project and choose "Export ..."
Open section "Java" and choose "Runnable JAR file"
Choose your new launch configuration and some new file <YOUR_PROJECT>.jar as the export destination
Click "Finish" and be prepared to ignore some warnings