I'm using libpd for android. I'm on a MacOS Sierra, and using Android Studio's emulator. I made it through Rafael's tutorial https://www.youtube.com/watch?v=cinOFA1pT1k&list=PLn3ODBv0ka5hS5areRFSTi2aydPMiUq3B - I got a simple patch that turns on by a switch. The emulator uses a Nexus 5 API 24, x86 architecture. So now I just have another simple patch with [noise~] going through [bob~] that I wanted to try and make it happen. 

So, [bob~] is an extra, and you don't get it by default in libpd, so it seems. I checked around, and was able to compile pd's extra as .so files. In my projects PdCore I got a libs folder with all these compiled externals for armeabi / armeabi-v7a / x86! The binary for bob seems to be "libbob_tilde.so". But having this is not enough for loading it and playing it... what else am I missing?

I also did try using PdBase.addToSearchPath in my code in MainActivity.java, I got the idea that would do it, but it didn't, here's how I tried it.

private void initPD() throws IOException{
    int sampleRate = AudioParameters.suggestSampleRate();
    PdAudio.initAudio(sampleRate, 0, 2, 8, true);

    PdBase.addToSearchPath("/Users/porres/Desktop/LearningLibPd/HelloPd/PdCore/libs/x86");

    dispatcher = new PdUiDispatcher();
    PdBase.setReceiver(dispatcher);

} 

cheers