title: Include .jar in my qt project
body: <p>I'm writing an application for android with qt. I use Epson BT-300 as device. Epson provided me a library to control display brightness. the library is a .jar file (i'm not familiar with java). I've try to use <code>QAndroidJniObject display("com.epson.moverio.btcontrol.DisplayControl")</code> but the linker returns me <code>error: undefined reference to 'QAndroidJniObject::QAndroidJniObject(char const*)'</code> I don't know how to insert my .jar file in my qt project.</p>