How to create your own library for Android development to be used in every program you write?

Question

I am a Delphi programmer and have written, over the years, hundreds of classes and routines which I can use in every Delphi program I write.

This library

Answer 1

With java, you create a Java Archive (jar) that contains all your classes (*.class files) of that library and the jar file is your library.

To use it, simply add it to the classpath.

(For "jar" and "classpath": basic Java concepts, please use google to find tutorials, you'll have to understand those concepts anyway, the sooner, the better ;) )