How to create a jar in Android studio?

How do you integrate a .jar file into an Android app?

• I have a .jar file and the associated .java and .class files.  What I want to do is create an Android app (I'm using Eclipse) and  somehow integrate the .jar file with it. The .jar file acts as a  Spellchecker and I want to create a Spellchecker app, so how should I go  about doing this? I know I will have to make changes, of course, but is  this possible?

• Answer:

  First of all, not all Java SE APIs that are called by third-party jars exist on Android, or if they do, work exactly the same. Next, it's better to include the source code into your source tree, rather than copying the jar to the libs folder. This way, the tools such as  lint can have a look at it - http://developer.android.com/tools/debugging/improving-w-lint.html