Feb 01, 2018
(and last updated on Sep 22, 2019)
Includes two files: AndroidSystemSynth.dls (which is just a copy of gm.dls that I extracted from my phone), and AndroidSystemSynth.sf2 (made by running the *.dls through Viena).
Right away, you'll recognise a number of sounds (particularly drumkits) from other files hosted on this site.
Unfortunately, a few of the presets sound oddly out of tune, even in the unaltered *.dls file, but I'm pretty sure that's also how they sound on an actual Android device.