It is open source god damn it!
The interview is from September 2013 but is an interesting read for anyone even slightly interested in developing Audio applications for Android.
So here is some links:
The interview:
http://designingsound.org/2013/09/interview-peter-brinkmann-libpd/
Patchfield information:
http://google-opensource.blogspot.co.uk/2013/09/patchfield-for-android.html
Two Big Ears writing about their work with LibPD / Processing and making their app Circle:
http://twobigears.com/labs/configuring-eclipse-to-work-with-processinglibpd-in-android/