Configuring an I2P Browser on Android consistently has not always been easy. After evaluating many approaches, the one which I believe is easiest at this time is represented by Privacy Browser which is developed by Soren Stoutner and available gratis/libre on F-Droid.
Using this browser requires you to have the I2P for Android application installed and running.
For your convenience, you can copy-and-paste from here:
http://legwork.i2p/search?=
- Image contributed by @Shoalsteed