Bugfender Android SDK is distributed in form of an AAR library (Android ARchive), which unfortunately is not directly supported by Ant nor Maven build systems.
However you can take the following manual steps to install Bugfender in your project:
Download the latest version of the Android SDK (download the aar file)
Change the file extension to .zip and unzip it
Take the classes.jar file and put it in your libs directory
Make sure your project is supporting Android SDK at least versions 9 and up (you can check that in your AndroidManifest.xml, minSdkVersion attribute)
Edit your AndroidManifest.xml and add the two following permissions if you don't have them already:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />