Here is the step-by-step:
Download the library to your host development system.
Create a new folder, libs, in your Eclipse/Android project
.
Right-click libs and choose Import -> General -> File System
, then
Next
, Browse in the filesystem to find the library's parent directory
(i.e.: where you downloaded it to).
Click OK, then click the directory name (not the checkbox) in the
left pane, then check the relevant JAR in the right pane. This puts
the library into your project (physically).
Right-click on your project, choose Build Path -> Configure Build
Path
, then click the Libraries tab
, then Add JARs...
, navigate to
your new JAR in the libs directory and add it. (This, incidentally,
is the moment at which your new JAR is converted for use on Android.)
NOTE
Step 5 may not be needed, if the lib is already included in your build path. Just ensure that its existence first before adding it.
This is also explained at adding-a-library-jar-to-an-eclipse-android-project.